stdio-common: Add tests for formatted printf output specifiers

This is a collection of tests for formatted printf output specifiers
covering the d, i, o, u, x, and X integer conversions, the e, E, f, F,
g, and G floating-point conversions, the c character conversion, and the
s string conversion.  Also the hh, h, l, and ll length modifiers are
covered with the integer conversions as is the L length modifier with
the floating-point conversions.

The -, +, space, #, and 0 flags are iterated over, as permitted by the
conversion handled, in tuples of 1..5, including tuples with repetitions
of 2, and combined with field width and/or precision, again as permitted
by the conversion.  The resulting format string is then used to produce
output from respective sets of input data corresponding to the specific
conversion under test.  POSIX extensions beyond ISO C are not used.

Output is produced in the form of records which include both the format
string (and width and/or precision where given in the form of separate
arguments) and the conversion result, and is verified with GNU AWK using
the format obtained from each such record against the reference value
also supplied, relying on the fact that GNU AWK has its own independent
implementation of format processing, striving to be ISO C compatible.

In the course of implementation I have determined that in the non-bignum
mode GNU AWK uses system sprintf(3) for the floating-point conversions,
defeating the objective of doing the verification against an independent
implementation.  Additionally the bignum mode (using MPFR) is required
to correctly output wider integer and floating-point data.  Therefore
for the conversions affected the relevant shell scripts sanity-check AWK
and terminate with unsupported status if the bignum mode is unavailable
for floating-point data or where data is output incorrectly.

The f and F floating-point conversions are build-time options for GNU
AWK, depending on the environment, so they are probed for before being
used.  Similarly the a and A floating-point conversions, however they
are currently not used, see below.  Also GNU AWK does not handle the b
or B integer conversions at all at the moment, as at 5.3.0.  Support for
the a, A, b, and B conversions can however be easily added following the
approach taken for the f and F conversions.

Output produced by gawk for the a and A floating-point conversions does
not match one produced by us: insufficient precision is used where one
hasn't been explicitly given, e.g. for the negated maximum finite IEEE
754 64-bit value of -1.79769313486231570814527423731704357e+308 and "%a"
format we produce -0x1.fffffffffffffp+1023 vs gawk's -0x1.000000p+1024
and a different exponent is chosen otherwise, such as with "%.a" where
we output -0x2p+1023 vs gawk's -0x1p+1024 for the same value, or "%.20a"
where -0x1.fffffffffffff0000000p+1023 is our output, but gawk produces
-0xf.ffffffffffff80000000p+1020 instead.  Consequently I chose not to
include a and A conversions in testing at this time.

And last but not least there are numerous corner cases that GNU AWK does
not handle correctly, which are worked around by explicit handling in
the AWK script.  These are in particular:

- extraneous leading 0 produced for the alternative form with the o
  conversion, e.g. { printf "%#.2o", 1 } produces "001" rather than
  "01",

- unexpected 0 produced where no characters are expected for the input
  of 0 and the alternative form with the precision of 0 and the integer
  hexadecimal conversions, e.g. { printf "%#.x", 0 } produces "0" rather
  than "",

- missing + character in the non-bignum mode only for the input of 0
  with the + flag, precision of 0 and the signed integer conversions,
  e.g. { printf "%+.i", 0 } produces "" rather than "+",

- missing space character in the non-bignum mode only for the input of 0
  with the space flag, precision of 0 and the signed integer
  conversions, e.g. { printf "% .i", 0 } produces "" rather than " ",

- for released gawk versions of up to 4.2.1 missing - character for the
  input of -NaN with the floating-point conversions, e.g. { printf "%e",
  "-nan" }' produces "nan" rather than "-nan",

- for released gawk versions from 5.0.0 onwards + character output for
  the input of -NaN with the floating-point conversions, e.g. { printf
  "%e", "-nan" }' produces "+nan" rather than "-nan",

- for released gawk versions from 5.0.0 onwards + character output for
  the input of Inf or NaN in the absence of the + or space flags with
  the floating-point conversions, e.g. { printf "%e", "inf" }' produces
  "+inf" rather than "inf",

- for released gawk versions of up to 4.2.1 missing + character for the
  input of Inf or NaN with the + flag and the floating-point
  conversions, e.g. { printf "%+e", "inf" }' produces "inf" rather than
  "+inf",

- for released gawk versions of up to 4.2.1 missing space character for
  the input of Inf or NaN with the space flag and the floating-point
  conversions, e.g. { printf "% e", "nan" }' produces "nan" rather than
  " nan",

- for released gawk versions from 5.0.0 onwards + character output for
  the input of Inf or NaN with the space flag and the floating-point
  conversions, e.g. { printf "% e", "inf" }' produces "+inf" rather than
  " inf",

- for released gawk versions from 5.0.0 onwards the field width is
  ignored for the input of Inf or NaN and the floating-point
  conversions, e.g. { printf "%20e", "-inf" }' produces "-inf" rather
  than "                -inf",

NB for released gawk versions of up to 4.2.1 floating-point conversion
issues apply to the bignum mode only, as in the non-bignum mode system
sprintf(3) is used.  As from version 5.0.0 specialized handling has been
added for [-]Inf and [-]NaN inputs and the issues listed apply to both
modes.  The '--posix' flag makes gawk versions from 5.0.0 onwards avoid
the issue with field width and the + character unconditionally output
for the input of Inf or NaN, however not the remaining issues and then
the 'gensub' function is not supported in the POSIX mode, so to go this
path I deemed not worth it.

Each test completes within single seconds except for the long double
one.  There the F/f formats produce a large number of digits, which
appears to be computationally intensive and CPU-bound.  Standalone
execution time for 'tst-printf-format-p-ldouble --direct f' is in the
range of 00m36s for POWER9@2.166GHz and 09m52s for FU740@1.2GHz and
output redirected locally to /dev/null, and 10m11s for FU740 and output
redirected over 100Mbps network via SSH to /dev/null, so the throughput
of the network adds very little (~3.2% in this case) to the processing
time.  This is with IEEE 754 quad.

So I have scaled the timeout for 'tst-printf-format-skeleton-ldouble'
accordingly.  Regardless, following recent practice the test has been
added to the standard rather than extended set.  However, unlike most
of the remaining tests it has been split by the conversion specifier,
so as to allow better parallelization of this long-running test.  As
a side effect this lets the test report the unsupported status for the
F/f conversions where applicable, so 'tst-printf-format-p-double' has
been split for consistency as well.

Only printf itself is handled at the moment, but the infrastructure
provides for all the printf family functions to be verified, changes
for which to be supplied separately.  The complication around having
some tests iterating over all the relevant conversion specifiers and
other verifying conversion specifiers individually combined with
iterating over printf family functions has hit a peculiarity in GNU
make where the use of multiple targets with a pattern rule is handled
differently from such use with an ordinary rule.  Consequently it
seems impossible to bulk-define a pattern rule using '$(foreach ...)',
where each target would simply trigger the recipe according to the
pattern and matching dependencies individually (such a rule does work,
but implies all targets to be updated with a single recipe execution).

Therefore as a compromise a single single-target pattern rule has been
defined that has listed all the conversion-specific scripts and all the
test executables as dependencies.  Consequently tests will be rerun in
the absence of changes to their actual sources or scripts whenever an
unrelated file has changed that has been listed.  Also all the formatted
printf output tests will always be built whenever any single one is to
be run.  This only affects test development and not test runs in the
field, though it does change the order of execution of the individual
steps and also acts as a Makefile barrier in parallel runs.  As the
execution time dominates the compilation time for these tests it is not
seen as a serious shortcoming.

As pointed out by Florian Weimer <fweimer@redhat.com> the malloc tracing
facility can take a substantial amount of time in calling dladdr(3) to
determine the caller's location.  This is not needed by the verification
made with these tests, so I chose to interpose the symbol with a stub
implementation that always fails in the shared skeleton.  We have total
control over the test environment, so I think it is a safe and minimal
impact approach.  If there's ever anything else added to the tests that
would actually rely on dladdr(3) returning usable results, only then we
can think of a different approach.

Reviewed-by: DJ Delorie <dj@redhat.com>

47 files changed, 2027 insertions, 0 deletions

diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index a166eb7cf8..aa402268a5 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -22,6 +22,34 @@ subdir	:= stdio-common
 
 include ../Makeconfig
 
+# List of markers for printf family function tests.
+xprintf-funcs := p
+
+# List of data types and formats for individual per-conversion printf tests.
+fmt-convs := double ldouble
+fmts := E e F f G g
+
+# List of data types grouping all conversions in single printf tests.
+nonfmt-convs := c char int llong long s short
+nonfmt-convs += uchar uint ullong ulong ushort
+
+convs := $(sort $(fmt-convs) $(nonfmt-convs))
+
+xprintf-srcs := \
+  $(foreach p,$(xprintf-funcs), \
+	    $(foreach c,$(convs),tst-printf-format-$(p)-$(c)))
+
+fmt-xprintf-stems := \
+  $(foreach f,$(fmts), \
+	    $(foreach p,$(xprintf-funcs), \
+		      $(foreach c,$(fmt-convs), \
+				tst-printf-format-$(p)-$(c)-$(f))))
+nonfmt-xprintf-stems := \
+  $(foreach p,$(xprintf-funcs), \
+	    $(foreach c,$(nonfmt-convs),tst-printf-format-$(p)-$(c)))
+
+xprintf-stems := $(sort $(fmt-xprintf-stems) $(nonfmt-xprintf-stems))
+
 headers := \
   bits/printf-ldbl.h \
   bits/stdio_lim.h \
@@ -317,6 +345,7 @@ tests-internal = \
   # tests-internal
 
 test-srcs = \
+  $(xprintf-srcs) \
   tst-printf \
   tst-printfsz-islongdouble \
   tst-unbputc \
@@ -324,6 +353,7 @@ test-srcs = \
 
 ifeq ($(run-built-tests),yes)
 tests-special += \
+  $(foreach f,$(xprintf-stems),$(objpfx)$(f).out) \
   $(objpfx)tst-printf.out \
   $(objpfx)tst-printfsz-islongdouble.out \
   $(objpfx)tst-setvbuf1-cmp.out \
@@ -333,6 +363,7 @@ tests-special += \
 ifeq (yes,$(build-shared))
 ifneq ($(PERL),no)
 tests-special += \
+  $(foreach f,$(xprintf-stems),$(objpfx)$(f)-mem.out) \
   $(objpfx)tst-freopen2-mem.out \
   $(objpfx)tst-freopen3-mem.out \
   $(objpfx)tst-freopen4-mem.out \
@@ -353,6 +384,8 @@ tests-special += \
   # tests-special
 
 generated += \
+  $(foreach f,$(xprintf-stems),$(f)-mem.out) \
+  $(foreach f,$(xprintf-stems),$(f).mtrace) \
   tst-freopen2-mem.out \
   tst-freopen2.mtrace \
   tst-freopen3-mem.out \
@@ -526,6 +559,21 @@ $(objpfx)tst-printf.out: tst-printf.sh $(objpfx)tst-printf
 	$(SHELL) $< $(common-objpfx) '$(test-program-prefix)'; \
 	$(evaluate-test)
 
+# We can't split a quoted recipe line, so do it via an auxiliary variable.
+make-tst-printf-format-out = \
+  AWK='$(AWK)' BASH='$(BASH)' \
+    $(BASH) $< $@ $(common-objpfx) \
+    '$(run-program-prefix-before-env) \
+     $(run-program-env) \
+     MALLOC_TRACE=$(@:.out=.mtrace) \
+     LD_PRELOAD=$(common-objpfx)malloc/libc_malloc_debug.so \
+     $(run-program-prefix-after-env)'
+$(objpfx)tst-printf-format-%.out: \
+  tst-printf-format.sh $(foreach c,$(convs),tst-printf-format-$(c).sh) \
+  $(foreach f,$(xprintf-srcs),$(objpfx)$(f)) tst-printf-format.awk
+	$(make-tst-printf-format-out) > $@; \
+	$(evaluate-test)
+
 $(objpfx)tst-printfsz-islongdouble.out: \
   tst-printfsz-islongdouble.sh $(objpfx)tst-printfsz-islongdouble
 	$(SHELL) $^ '$(test-program-prefix)' $@; \
@@ -539,6 +587,10 @@ $(objpfx)tst-printf-bz18872.c: tst-printf-bz18872.sh
 $(objpfx)tst-%-mem.out: $(objpfx)tst-%.out
 	$(common-objpfx)malloc/mtrace $(objpfx)tst-$*.mtrace > $@; \
 	$(evaluate-test)
+$(objpfx)tst-printf-format-%-mem.out: $(objpfx)tst-printf-format-%.out
+	$(common-objpfx)malloc/mtrace \
+	  $(objpfx)tst-printf-format-$*.mtrace > $@; \
+	$(evaluate-test)
 
 errlist-h = $(firstword $(wildcard $(addsuffix /errlist.h,$(sysdirs) .)))
 
diff --git a/stdio-common/tst-printf-format-c.sh b/stdio-common/tst-printf-format-c.sh
new file mode 100644
index 0000000000..2b8d72050f
--- /dev/null
+++ b/stdio-common/tst-printf-format-c.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Testing of the 'c' printf conversion.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+echo Verifying c
+(set -o pipefail
+ ${test_program_prefix} \
+  ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-c c |
+   $AWK -f tst-printf-format.awk 2>&1 |
+   head -n 1 | sed "s/^/Conversion c output error, first line:\n/") 2>&1 ||
+  exit 1
diff --git a/stdio-common/tst-printf-format-char.sh b/stdio-common/tst-printf-format-char.sh
new file mode 100644
index 0000000000..99219679df
--- /dev/null
+++ b/stdio-common/tst-printf-format-char.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Testing of signed char printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=0
+
+for f in d i; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-char $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-double.sh b/stdio-common/tst-printf-format-double.sh
new file mode 100644
index 0000000000..b4e61acfdc
--- /dev/null
+++ b/stdio-common/tst-printf-format-double.sh
@@ -0,0 +1,74 @@
+#!/bin/bash
+# Testing of double printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+format=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+# For floating-point formats we need to use the bignum mode even if the
+# regular mode would do, because GAWK in the latter mode uses sprintf(3)
+# internally to process the conversion requested, so any bug in our code
+# would then be verified against itself, defeating the objective of doing
+# the verification against an independent implementation.
+AWK="${AWK:-awk} -M"
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="-1.79769313486231570814527423731704357e+308"
+val=$(echo "$ref" | $AWK '{ printf "%.35e\n", $1 }' 2>&1) &&
+  test "$val" = "$ref" && status=0
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+# Check for any additional conversions that AWK handles conditionally
+# according to its version and/or the environment it has been built in.
+# The 'A' and 'a' conversions are not suitable to use at this point, as
+# output produced by AWK is different apparently due to a subtlety in
+# rounding, so do not try them.
+declare -A conversion_disabled
+ref="-inf"
+for f in f F; do
+  conversion_disabled[$f]=true
+  val=$(echo "$ref" | $AWK '{ printf "%'$f'\n", $1 }' 2>&1) &&
+    test "${val^^}" = "${ref^^}" && unset conversion_disabled[$f]
+done
+
+if test "${conversion_disabled[$format]+set}" = set; then
+  echo Unsupported $format
+  status=77
+else
+  echo Verifying $format
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-double $format |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 |
+     sed "s/^/Conversion $format output error, first line:\n/") 2>&1 ||
+    status=1
+fi
+
+exit $status
diff --git a/stdio-common/tst-printf-format-int.sh b/stdio-common/tst-printf-format-int.sh
new file mode 100644
index 0000000000..32dcfb160a
--- /dev/null
+++ b/stdio-common/tst-printf-format-int.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="-2147483648"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in d i; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-int $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-ldouble.sh b/stdio-common/tst-printf-format-ldouble.sh
new file mode 100644
index 0000000000..4bfecadea9
--- /dev/null
+++ b/stdio-common/tst-printf-format-ldouble.sh
@@ -0,0 +1,74 @@
+#!/bin/bash
+# Testing of long double printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+format=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+# For floating-point formats we need to use the bignum mode even if the
+# regular mode would do, because GAWK in the latter mode uses sprintf(3)
+# internally to process the conversion requested, so any bug in our code
+# would then be verified against itself, defeating the objective of doing
+# the verification against an independent implementation.
+AWK="${AWK:-awk} -M"
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="-1.18973149535723176508575932662800702e+4932"
+val=$(echo "$ref" | $AWK '{ PREC=113; printf "%.35e\n", $1 }' 2>&1) &&
+  test "$val" = "$ref" && status=0
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+# Check for any additional conversions that AWK handles conditionally
+# according to its version and/or the environment it has been built in.
+# The 'A' and 'a' conversions are not suitable to use at this point, as
+# output produced by AWK is different apparently due to a subtlety in
+# rounding, so do not try them.
+declare -A conversion_disabled
+ref="-inf"
+for f in f F; do
+  conversion_disabled[$f]=true
+  val=$(echo "$ref" | $AWK '{ printf "%'$f'\n", $1 }' 2>&1) &&
+    test "${val^^}" = "${ref^^}" && unset conversion_disabled[$f]
+done
+
+if test "${conversion_disabled[$format]+set}" = set; then
+  echo Unsupported $format
+  status=77
+else
+  echo Verifying $format
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-ldouble $format |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 |
+     sed "s/^/Conversion $format output error, first line:\n/") 2>&1 ||
+    status=1
+fi
+
+exit $status
diff --git a/stdio-common/tst-printf-format-llong.sh b/stdio-common/tst-printf-format-llong.sh
new file mode 100644
index 0000000000..b028a2c89b
--- /dev/null
+++ b/stdio-common/tst-printf-format-llong.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of long long int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="9223372036854775807"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in d i; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-llong $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-long.sh b/stdio-common/tst-printf-format-long.sh
new file mode 100644
index 0000000000..77c67ea5bf
--- /dev/null
+++ b/stdio-common/tst-printf-format-long.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of long int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="9223372036854775807"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in d i; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-long $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-p-c.c b/stdio-common/tst-printf-format-p-c.c
new file mode 100644
index 0000000000..ba46f55431
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-c.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for the 'c' conversion.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-c.c"
diff --git a/stdio-common/tst-printf-format-p-char.c b/stdio-common/tst-printf-format-p-char.c
new file mode 100644
index 0000000000..7640bf8f66
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-char.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for signed char conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-char.c"
diff --git a/stdio-common/tst-printf-format-p-double.c b/stdio-common/tst-printf-format-p-double.c
new file mode 100644
index 0000000000..8271ec7bea
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-double.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for double conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-double.c"
diff --git a/stdio-common/tst-printf-format-p-int.c b/stdio-common/tst-printf-format-p-int.c
new file mode 100644
index 0000000000..cdfaaacc34
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-int.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-int.c"
diff --git a/stdio-common/tst-printf-format-p-ldouble.c b/stdio-common/tst-printf-format-p-ldouble.c
new file mode 100644
index 0000000000..266989db32
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-ldouble.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for long double conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-ldouble.c"
diff --git a/stdio-common/tst-printf-format-p-llong.c b/stdio-common/tst-printf-format-p-llong.c
new file mode 100644
index 0000000000..936f626a45
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-llong.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for long long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-llong.c"
diff --git a/stdio-common/tst-printf-format-p-long.c b/stdio-common/tst-printf-format-p-long.c
new file mode 100644
index 0000000000..c82c3cac09
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-long.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-long.c"
diff --git a/stdio-common/tst-printf-format-p-s.c b/stdio-common/tst-printf-format-p-s.c
new file mode 100644
index 0000000000..4b0201ae94
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-s.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for the 's' conversion.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-s.c"
diff --git a/stdio-common/tst-printf-format-p-short.c b/stdio-common/tst-printf-format-p-short.c
new file mode 100644
index 0000000000..2bf17f1b25
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-short.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for short int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-short.c"
diff --git a/stdio-common/tst-printf-format-p-uchar.c b/stdio-common/tst-printf-format-p-uchar.c
new file mode 100644
index 0000000000..02a70c3f15
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-uchar.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for unsigned char conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-uchar.c"
diff --git a/stdio-common/tst-printf-format-p-uint.c b/stdio-common/tst-printf-format-p-uint.c
new file mode 100644
index 0000000000..e61455e010
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-uint.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for unsigned int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-uint.c"
diff --git a/stdio-common/tst-printf-format-p-ullong.c b/stdio-common/tst-printf-format-p-ullong.c
new file mode 100644
index 0000000000..16b2541acd
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-ullong.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for unsigned long long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-ullong.c"
diff --git a/stdio-common/tst-printf-format-p-ulong.c b/stdio-common/tst-printf-format-p-ulong.c
new file mode 100644
index 0000000000..0b3a7fd256
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-ulong.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for unsigned long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-ulong.c"
diff --git a/stdio-common/tst-printf-format-p-ushort.c b/stdio-common/tst-printf-format-p-ushort.c
new file mode 100644
index 0000000000..fa62f500ab
--- /dev/null
+++ b/stdio-common/tst-printf-format-p-ushort.c
@@ -0,0 +1,20 @@
+/* Test for formatted 'printf' output for unsigned short int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include "tst-printf-format-p.h"
+#include "tst-printf-format-skeleton-ushort.c"
diff --git a/stdio-common/tst-printf-format-p.h b/stdio-common/tst-printf-format-p.h
new file mode 100644
index 0000000000..a9ffbb0d0e
--- /dev/null
+++ b/stdio-common/tst-printf-format-p.h
@@ -0,0 +1,29 @@
+/* Test feature wrapper for formatted 'printf' output.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+
+#define printf_under_test(...)						\
+({									\
+  int result;								\
+									\
+  result = printf (__VA_ARGS__);					\
+  if (result < 0)							\
+    perror ("printf");							\
+  result;								\
+})
diff --git a/stdio-common/tst-printf-format-s.sh b/stdio-common/tst-printf-format-s.sh
new file mode 100644
index 0000000000..fa0690f980
--- /dev/null
+++ b/stdio-common/tst-printf-format-s.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Testing of the 's' printf conversion.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+echo Verifying s
+(set -o pipefail
+ ${test_program_prefix} \
+  ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-s s |
+   $AWK -f tst-printf-format.awk 2>&1 |
+   head -n 1 | sed "s/^/Conversion s output error, first line:\n/") 2>&1 ||
+  exit 1
diff --git a/stdio-common/tst-printf-format-short.sh b/stdio-common/tst-printf-format-short.sh
new file mode 100644
index 0000000000..a610a15fa1
--- /dev/null
+++ b/stdio-common/tst-printf-format-short.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Testing of short int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=0
+
+for f in d i; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-short $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-skeleton-c.c b/stdio-common/tst-printf-format-skeleton-c.c
new file mode 100644
index 0000000000..3f9bbc91e3
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-c.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for the 'c' conversion.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 3
+#define HUGE_WIDTH 4
+#define REF_FMT "c"
+#define REF_VAL(v) (v)
+typedef unsigned char type_t;
+static const type_t vals[] = { 0, 42, UCHAR_MAX };
+static const char length[] = "";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-char.c b/stdio-common/tst-printf-format-skeleton-char.c
new file mode 100644
index 0000000000..8c7b44b061
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-char.c
@@ -0,0 +1,31 @@
+/* Test skeleton for formatted printf output for signed char conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 3
+#define HUGE_WIDTH 5
+#define REF_FMT "i"
+#define REF_VAL(v) ((((v) & 0xff) ^ 0x80) - 0x80)
+typedef int type_t;
+static const type_t vals[] =
+  { SCHAR_MIN - 123, SCHAR_MIN - 1, SCHAR_MIN, -123, -1, 0, 1, 42, SCHAR_MAX,
+    SCHAR_MAX + 1, SCHAR_MAX + 42 };
+static const char length[] = "hh";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-double.c b/stdio-common/tst-printf-format-skeleton-double.c
new file mode 100644
index 0000000000..03ac594736
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-double.c
@@ -0,0 +1,33 @@
+/* Test skeleton for formatted printf output for double conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <float.h>
+#include <math.h>
+
+#define MID_WIDTH 20
+#define HUGE_WIDTH 320
+#define REF_FMT ".35e"
+#define REF_VAL(v) (v)
+#define PREC DBL_MANT_DIG
+typedef double type_t;
+static const type_t vals[] =
+  { -HUGE_VAL, -DBL_MAX, -DBL_MIN, copysign (0, -1), -NAN, NAN, 0, DBL_MIN,
+    DBL_MAX, HUGE_VAL };
+static const char length[] = "";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-int.c b/stdio-common/tst-printf-format-skeleton-int.c
new file mode 100644
index 0000000000..5d2076c53f
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-int.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 8
+#define HUGE_WIDTH 15
+#define REF_FMT "i"
+#define REF_VAL(v) (v)
+typedef int type_t;
+static const type_t vals[] = { INT_MIN, -123, -1, 0, 1, 42, INT_MAX };
+static const char length[] = "";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-ldouble.c b/stdio-common/tst-printf-format-skeleton-ldouble.c
new file mode 100644
index 0000000000..ed47e77963
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-ldouble.c
@@ -0,0 +1,38 @@
+/* Test skeleton for formatted printf output for long double conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <float.h>
+#include <math.h>
+#include <support/test-driver.h>
+
+#define MID_WIDTH 20
+#define HUGE_WIDTH 4950
+#define REF_FMT ".35Le"
+#define REF_VAL(v) (v)
+#define PREC LDBL_MANT_DIG
+typedef long double type_t;
+static const type_t vals[] =
+  { -HUGE_VAL, -LDBL_MAX, -LDBL_MIN, copysign (0, -1), -NAN, NAN, 0, LDBL_MIN,
+    LDBL_MAX, HUGE_VAL };
+static const char length[] = "L";
+
+#ifndef TIMEOUT
+# define TIMEOUT (DEFAULT_TIMEOUT * 64)
+#endif
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-llong.c b/stdio-common/tst-printf-format-skeleton-llong.c
new file mode 100644
index 0000000000..9a4b7a39af
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-llong.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for long long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 15
+#define HUGE_WIDTH 25
+#define REF_FMT "lli"
+#define REF_VAL(v) (v)
+typedef long long int type_t;
+static const type_t vals[] = { LLONG_MIN, -123, -1, 0, 1, 42, LLONG_MAX };
+static const char length[] = "ll";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-long.c b/stdio-common/tst-printf-format-skeleton-long.c
new file mode 100644
index 0000000000..bf011b7fdb
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-long.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 15
+#define HUGE_WIDTH 25
+#define REF_FMT "li"
+#define REF_VAL(v) (v)
+typedef long int type_t;
+static const type_t vals[] = { LONG_MIN, -123, -1, 0, 1, 42, LONG_MAX };
+static const char length[] = "l";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-s.c b/stdio-common/tst-printf-format-skeleton-s.c
new file mode 100644
index 0000000000..59aab9fc89
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-s.c
@@ -0,0 +1,30 @@
+/* Test skeleton for formatted printf output for the 's' conversion.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 5
+#define HUGE_WIDTH 10
+#define REF_FMT "s"
+#define REF_VAL(v) (v)
+typedef const char *type_t;
+static const type_t vals[] =
+  { "", "The", "quick", "brown fox", "jumps over the lazy dog" };
+static const char length[] = "";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-short.c b/stdio-common/tst-printf-format-skeleton-short.c
new file mode 100644
index 0000000000..1b7c8c09d7
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-short.c
@@ -0,0 +1,31 @@
+/* Test skeleton for formatted printf output for short int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 4
+#define HUGE_WIDTH 7
+#define REF_FMT "i"
+#define REF_VAL(v) ((((v) & 0xffff) ^ 0x8000) - 0x8000)
+typedef int type_t;
+static const type_t vals[] =
+  { SHRT_MIN - 123, SHRT_MIN - 1, SHRT_MIN, -123, -1, 0, 1, 42, SHRT_MAX,
+    SHRT_MAX + 1, SHRT_MAX + 42 };
+static const char length[] = "h";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-uchar.c b/stdio-common/tst-printf-format-skeleton-uchar.c
new file mode 100644
index 0000000000..389188d746
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-uchar.c
@@ -0,0 +1,30 @@
+/* Test skeleton for formatted printf output for unsigned char conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 3
+#define HUGE_WIDTH 4
+#define REF_FMT "u"
+#define REF_VAL(v) ((v) & 0xff)
+typedef unsigned int type_t;
+static const type_t vals[] =
+  { 0, 1, 42, UCHAR_MAX, UCHAR_MAX + 1, UCHAR_MAX + 42 };
+static const char length[] = "hh";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-uint.c b/stdio-common/tst-printf-format-skeleton-uint.c
new file mode 100644
index 0000000000..6a41591114
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-uint.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for unsigned int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 7
+#define HUGE_WIDTH 14
+#define REF_FMT "u"
+#define REF_VAL(v) (v)
+typedef unsigned int type_t;
+static const type_t vals[] = { 0, 1, 42, UINT_MAX };
+static const char length[] = "";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-ullong.c b/stdio-common/tst-printf-format-skeleton-ullong.c
new file mode 100644
index 0000000000..a2ad7893cf
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-ullong.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for unsigned long long int convs.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 14
+#define HUGE_WIDTH 24
+#define REF_FMT "llu"
+#define REF_VAL(v) (v)
+typedef unsigned long long int type_t;
+static const type_t vals[] = { 0, 1, 42, UINT_MAX, ULLONG_MAX };
+static const char length[] = "ll";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-ulong.c b/stdio-common/tst-printf-format-skeleton-ulong.c
new file mode 100644
index 0000000000..05cd4e0efc
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-ulong.c
@@ -0,0 +1,29 @@
+/* Test skeleton for formatted printf output for unsigned long int conversions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 14
+#define HUGE_WIDTH 24
+#define REF_FMT "lu"
+#define REF_VAL(v) (v)
+typedef unsigned long int type_t;
+static const type_t vals[] = { 0, 1, 42, ULONG_MAX };
+static const char length[] = "l";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton-ushort.c b/stdio-common/tst-printf-format-skeleton-ushort.c
new file mode 100644
index 0000000000..5cc2e0283a
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton-ushort.c
@@ -0,0 +1,30 @@
+/* Test skeleton for formatted printf output for unsigned short int convs.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+
+#define MID_WIDTH 3
+#define HUGE_WIDTH 6
+#define REF_FMT "u"
+#define REF_VAL(v) ((v) & 0xffff)
+typedef unsigned int type_t;
+static const type_t vals[] =
+  { 0, 1, 42, USHRT_MAX, USHRT_MAX + 1, USHRT_MAX + 42 };
+static const char length[] = "h";
+
+#include "tst-printf-format-skeleton.c"
diff --git a/stdio-common/tst-printf-format-skeleton.c b/stdio-common/tst-printf-format-skeleton.c
new file mode 100644
index 0000000000..e564d3a853
--- /dev/null
+++ b/stdio-common/tst-printf-format-skeleton.c
@@ -0,0 +1,380 @@
+/* Test skeleton for formatted printf output.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* The following definitions have to be supplied by the source including
+   this skeleton:
+
+   Macros:
+   MID_WIDTH	Medium width/precision positive integer constant.  Choose
+		such as to cause some, but not all the strings produced
+		to be truncated for the conversions handled.
+   HUGE_WIDTH	Large width/precision positive integer constant.  Choose
+		such as to cause none of the strings produced to be
+		truncated for the conversions handled.
+   REF_FMT	Reference output format string.  Use no flags and such
+		a precision and length modifier, where applicable, and
+		a conversion as to make sure the output produced allows
+		the original value to be reproduced.
+   REF_VAL(v)	Reference value V transformation.  For conversions with
+		a truncating length modifier define such as to reproduce
+		the truncation operation, otherwise let V pass through.
+   PREC		[optional] Working precision positive integer constant.
+		Set to the number of binary digits in the significand for
+		the argument type handled; usually for floating-point
+		conversions only, but it may be required for 128-bit or
+		wider integer data types as well.
+
+   Typedefs:
+   type_t	Variadic function argument type.  Define to the promoted
+		type corresponding to the conversion argument type
+		handled.
+
+   Variables:
+   vals		Array of TYPE_T values.  Choose such as to cover boundary
+		and any special cases.
+   length	Length modifier string.  Define according to the
+		conversion argument type handled.
+
+   The feature to be tested is wrapped into 'printf_under_test'.  It is up
+   to the source including this skeleton if this is going to be a macro
+   or an actual function.
+
+   See tst-*printf-format-*.c for usage examples.  */
+
+#include <array_length.h>
+#include <dlfcn.h>
+#include <mcheck.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Set to nonzero to select all possible tuples with repetitions of 1..n
+   elements from the set of flags as defined in FLAGS array below; n is
+   the length of FLAGS array.  Otherwise select all possible tuples with
+   repetitions of 1..2 elements, followed by tuples of 3..n elements where
+   the index of each element k; k = 2..n in FLAGS is lower than the index
+   of element k-1 in FLAGS.  */
+#ifndef TST_PRINTF_DUPS
+# define TST_PRINTF_DUPS 0
+#endif
+/* Set to nonzero to report the precision (number of significand digits)
+   required for floating-point calculations.  */
+#ifndef PREC
+# define PREC 0
+#endif
+
+/* The list of conversions permitted for the '#' flag, the '0' flag,
+   and precision respectively.  */
+#define HASH_FORMATS "boxXaAeEfFgG"
+#define ZERO_FORMATS "bdiouxXaAeEfFgG"
+#define PREC_FORMATS "bdiouxXaAeEfFgGs"
+
+/* Output format conversion flags.  */
+static struct
+{
+  /* Flag character.  */
+  char f;
+  /* List of conversion specifiers the flag is valid for; NULL if all.  */
+  const char *s;
+} const flags[] =
+  { {'-'}, {'+'}, {' '}, {'#', HASH_FORMATS}, {'0', ZERO_FORMATS} };
+
+/* Helper to initialize elements of the PW array for the width and
+   precision to be specified as a positive integer directly in the
+   format, and then as both a negative and a positive argument to '*'.  */
+#define STR(v) #v
+#define WPINIT(v) {0, STR (v)}, {v, NULL}, {-v, NULL}
+
+/* Width and precision settings to iterate over; zero is initialized
+   directly as it has no corresponding negated value and other values
+   use the helper above.  */
+static struct wp
+{
+  /* Integer argument to '*', used if S is NULL.  */
+  int i;
+  /* String denoting an integer to use in the format, or NULL to use '*'.  */
+  const char *s;
+} const wp[] =
+  { {0, "0"}, {0, NULL}, WPINIT (1), WPINIT (2),
+    WPINIT (MID_WIDTH), WPINIT (HUGE_WIDTH) };
+
+/* Produce a record according to '%' and zero or more output format flags
+   already provided in FMT at indices 0..IDX-1, width W if non-NULL, '.'
+   precision specifier if POINT set to true, precision P if non-NULL,
+   any length modifiers L, conversion C, and value VAL.
+
+   Record formats produced:
+
+   %<FLAGS><L><C>:<VAL>:
+   %<FLAGS>.<L><C>:<VAL>:
+   %<FLAGS><W><L><C>:<VAL>:
+   %<FLAGS><W>.<L><C>:<VAL>:
+   %<FLAGS>.<P><L><C>:<VAL>:
+   %<FLAGS><W>.<P><L><C>:<VAL>:
+   %<FLAGS>*<L><C>:<W>:<VAL>:
+   %<FLAGS>*.<L><C>:<W>:<VAL>:
+   %<FLAGS>.*<L><C>:<P>:<VAL>:
+   %<FLAGS>*.*<L><C>:<W>:<P>:<VAL>:
+
+   Return 0 on success, -1 on failure.  */
+
+static int
+do_printf (char *fmt, size_t idx,
+	   const struct wp *w, bool point, const struct wp *p,
+	   const char *l, char c, type_t val)
+{
+  int wpval[2] = { 0 };
+  size_t nint = 0;
+  int result;
+  size_t i;
+
+  if (w != NULL)
+    {
+      if (w->s == NULL)
+	{
+	  fmt[idx++] = '*';
+	  wpval[nint++] = w->i;
+	}
+      else
+	for (i = 0; w->s[i] != '\0'; i++)
+	  fmt[idx++] = w->s[i];
+    }
+  if (point)
+    fmt[idx++] = '.';
+  if (p != NULL)
+    {
+      if (p->s == NULL)
+	{
+	  fmt[idx++] = '*';
+	  wpval[nint++] = p->i;
+	}
+      else
+	for (i = 0; p->s[i] != '\0'; i++)
+	  fmt[idx++] = p->s[i];
+    }
+  for (i = 0; length[i] != '\0'; i++)
+    fmt[idx++] = length[i];
+  fmt[idx++] = c;
+  fmt[idx] = ':';
+  fmt[idx + 1] = '\0';
+  if (fputs (fmt, stdout) == EOF)
+    {
+      perror ("fputs");
+      return -1;
+    }
+  fmt[idx++] = '\0';
+  if (nint > 0)
+    {
+      result = printf ("%i:", wpval[0]);
+      if (result < 0)
+	{
+	  perror ("printf");
+	  return -1;
+	}
+      if (nint > 1)
+	{
+	  result = printf ("%i:", wpval[1]);
+	  if (result < 0)
+	    {
+	      perror ("printf");
+	      return -1;
+	    }
+	}
+    }
+  switch (nint)
+    {
+    case 0:
+      result = printf_under_test (fmt, val);
+      break;
+    case 1:
+      result = printf_under_test (fmt, wpval[0], val);
+      break;
+    case 2:
+      result = printf_under_test (fmt, wpval[0], wpval[1], val);
+      break;
+    default:
+      fputs ("Broken test, nint > 2\n", stderr);
+      return -1;
+    }
+  if (result < 0)
+    return -1;
+  if (fputs (":\n", stdout) == EOF)
+    {
+      perror ("fputs");
+      return -1;
+    }
+  return 0;
+}
+
+/* Produce a list of records according to '%' and zero or more output
+   format flags already provided in FMT at indices 0..IDX-1, iterating
+   over widths and precisions defined in global WP array, any length
+   modifiers L, conversion C, and value VAL.  Inline '0' is omitted for
+   the width, as it is a flag already handled among the flags supplied.
+   Precision is omitted where the conversion does not allow it.
+
+   Return 0 on success, -1 on failure.  */
+
+static int
+do_printf_flags (char *fmt, size_t idx, const char *l, char c, type_t val)
+{
+  bool do_prec = strchr (PREC_FORMATS, c) != NULL;
+  size_t i;
+
+  if (do_printf (fmt, idx, NULL, false, NULL, l, c, val) < 0)
+    return -1;
+  if (do_prec && do_printf (fmt, idx, NULL, true, NULL, l, c, val) < 0)
+    return -1;
+  for (i = 0; i < array_length (wp); i++)
+    {
+      size_t j;
+
+      if (do_prec && do_printf (fmt, idx, NULL, true, wp + i, l, c, val) < 0)
+	return -1;
+      /* Inline '0' is a flag rather than width and is handled elsewhere.  */
+      if (wp[i].s != NULL && wp[i].s[0] == '0' && wp[i].s[1] == '\0')
+	continue;
+      if (do_printf (fmt, idx, wp + i, false, NULL, l, c, val) < 0)
+	return -1;
+      if (do_prec)
+	{
+	  if (do_printf (fmt, idx, wp + i, true, NULL, l, c, val) < 0)
+	    return -1;
+	  for (j = 0; j < array_length (wp); j++)
+	    if (do_printf (fmt, idx, wp + i, true, wp + j, l, c, val) < 0)
+	      return -1;
+	}
+    }
+  return 0;
+}
+
+/* Produce a list of records using the formatted output specifier
+   supplied in ARGV[1] preceded by any length modifier supplied in
+   the global LENGTH variable, iterating over format flags defined
+   in the global FLAGS array, and values supplied in the global VALS
+   array.  Note that the output specifier supplied is not verified
+   against TYPE_T, so undefined behavior will result if this is used
+   incorrectly.
+
+   If PREC is nonzero, then this record:
+
+   prec:<PREC>
+
+   is produced at the beginning.  Then for each VAL from VALS a block
+   of records is produced starting with:
+
+   val:<VAL>
+
+   where VAL is formatted according to REF_FMT output format.  The
+   block continues with records as shown with DO_PRINTF above using
+   flags iterated over according to TST_PRINTF_DUPS.
+
+   See the top of this file for the definitions that have to be
+   provided by the source including this skeleton.  */
+
+static int
+do_test (int argc, char *argv[])
+{
+  char fmt[100] = {'%'};
+  size_t j;
+  size_t v;
+  char c;
+
+  if (argc < 2 || *argv[1] == '\0')
+    {
+      fprintf (stderr, "Usage: %s <specifier>\n", basename (argv[0]));
+      return EXIT_FAILURE;
+    }
+
+  mtrace ();
+
+  if (PREC && printf ("prec:%i\n", PREC) < 0)
+    {
+      perror ("printf");
+      return EXIT_FAILURE;
+    }
+
+  c = *argv[1];
+  for (v = 0; v < array_length (vals); v++)
+    {
+      if (printf ("val:%" REF_FMT "\n", REF_VAL (vals[v])) < 0)
+	{
+	  perror ("printf");
+	  return EXIT_FAILURE;
+	}
+
+      if (do_printf_flags (fmt, 1, length, c, vals[v]) < 0)
+	return EXIT_FAILURE;
+      for (j = 0; j < array_length (flags); j++)
+	{
+	  bool done = false;
+	  size_t i[j + 1];
+	  size_t k;
+
+	  memset (i, 0, sizeof (i));
+	  while (!done)
+	    {
+	      bool skip = false;
+	      size_t idx = 1;
+	      char f;
+
+	      for (k = 0; k <= j; k++)
+		{
+		  const char *s = flags[i[k]].s;
+
+		  if (s && strchr (s, c) == NULL)
+		    skip = true;
+		  if (!TST_PRINTF_DUPS && j > 1 && k > 0 && i[k] >= i[k - 1])
+		    skip = true;
+		  if (skip)
+		    break;
+
+		  f = flags[i[k]].f;
+		  fmt[idx++] = f;
+		}
+	      if (!skip && do_printf_flags (fmt, idx, length, c, vals[v]) < 0)
+		return EXIT_FAILURE;
+	      for (k = 0; k <= j; k++)
+		{
+		  i[k]++;
+		  if (i[k] < array_length (flags))
+		    break;
+		  else if (k == j)
+		    done = true;
+		  else
+		    i[k] = 0;
+		}
+	    }
+	}
+    }
+
+  return EXIT_SUCCESS;
+}
+
+/* Interpose 'dladdr' with a stub to speed up malloc tracing.  */
+
+int
+dladdr (const void *, Dl_info *)
+{
+  return 0;
+}
+
+#define TEST_FUNCTION_ARGV do_test
+#include <support/test-driver.c>
diff --git a/stdio-common/tst-printf-format-uchar.sh b/stdio-common/tst-printf-format-uchar.sh
new file mode 100644
index 0000000000..8385d479cc
--- /dev/null
+++ b/stdio-common/tst-printf-format-uchar.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Testing of unsigned char printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=0
+
+for f in o u x X; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-uchar $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-uint.sh b/stdio-common/tst-printf-format-uint.sh
new file mode 100644
index 0000000000..6806c99ce0
--- /dev/null
+++ b/stdio-common/tst-printf-format-uint.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of unsigned int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="4294967295"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in o u x X; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-uint $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-ullong.sh b/stdio-common/tst-printf-format-ullong.sh
new file mode 100644
index 0000000000..c4fa69c2d1
--- /dev/null
+++ b/stdio-common/tst-printf-format-ullong.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of unsigned long long int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="18446744073709551615"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in o u x X; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-ullong $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-ulong.sh b/stdio-common/tst-printf-format-ulong.sh
new file mode 100644
index 0000000000..fce881afe3
--- /dev/null
+++ b/stdio-common/tst-printf-format-ulong.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+# Testing of unsigned long int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=77
+
+# Verify that AWK can handle the range required.  It also catches:
+# "gawk: warning: -M ignored: MPFR/GMP support not compiled in"
+# message produced where bignum support is not there, which is the
+# only indication as the use of '-M' does not affect the exit status
+# in this case.
+ref="18446744073709551615"
+for AWK in "$AWK -M" "$AWK"; do
+  val=$(echo "$ref" | $AWK '{ printf "%d\n", $1 }' 2>&1) || continue
+  test "$val" = "$ref" && status=0 && break
+done
+
+test $status -eq 0 || { echo "No working AWK found" && exit $status; }
+
+for f in o u x X; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-ulong $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format-ushort.sh b/stdio-common/tst-printf-format-ushort.sh
new file mode 100644
index 0000000000..2f411b777e
--- /dev/null
+++ b/stdio-common/tst-printf-format-ushort.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Testing of unsigned short int printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+xprintf=$1; shift
+common_objpfx=$1; shift
+test_program_prefix=$1; shift
+
+AWK=${AWK:-awk}
+
+status=0
+
+for f in o u x X; do
+  echo Verifying $f
+  (set -o pipefail
+   ${test_program_prefix} \
+    ${common_objpfx}stdio-common/tst-printf-format-${xprintf}-ushort $f |
+     $AWK -f tst-printf-format.awk 2>&1 |
+     head -n 1 | sed "s/^/Conversion $f output error, first line:\n/") 2>&1 ||
+    status=1
+done
+
+exit $status
diff --git a/stdio-common/tst-printf-format.awk b/stdio-common/tst-printf-format.awk
new file mode 100644
index 0000000000..8b4bc7b1e4
--- /dev/null
+++ b/stdio-common/tst-printf-format.awk
@@ -0,0 +1,127 @@
+# Testing of printf conversions.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+BEGIN {
+  FS = ":"
+}
+
+/^prec:/ {
+  PREC = $2
+  next
+}
+
+/^val:/ {
+  val = $2
+  # Prepend "+" for +Inf or +NaN value lacking a sign, because gawk
+  # interpretes them as strings rather than numeric values in the
+  # non-bignum mode unless a sign has been explicitly given.  Keep
+  # original 'val' for reporting.
+  value = gensub(/^(INF|NAN|inf|nan)/, "+\\1", 1, val)
+  next
+}
+
+/^%/ {
+  # Discard the trailing empty field, used to improve legibility of data.
+  input = $--NF
+  format = $1
+  width = $2
+  precision = "." $(NF - 1)
+  # Discard any negative precision, which is to be taken as if omitted.
+  sub(/\.-.*/, "", precision)
+  # Simplify handling and paste the precision and width specified as
+  # arguments to '*' directly into the format.
+  sub(/\.\*/, precision, format)
+  sub(/\*/, width, format)
+  # Discard length modifiers.  They are only relevant to C data types.
+  sub(/([DHLjhltz]|wf?[1-9][0-9]*)/, "", format)
+  # Discard the '#' flag with the octal conversion if output starts with
+  # 0 in the absence of this flag.  In that case no extra 0 is supposed
+  # to be produced, but gawk prepends it anyway.
+  if (format ~ /#.*o/)
+    {
+      tmpfmt = gensub(/#/, "", "g", format)
+      tmpout = sprintf(tmpfmt, value)
+      if (tmpout ~ /^ *0/)
+	format = tmpfmt
+    }
+  # Likewise with the hexadecimal conversion where zero value with the
+  # precision of zero is supposed to produce no characters, but gawk
+  # outputs 0 instead.
+  else if (format ~ /#.*[Xx]/)
+    {
+      tmpfmt = gensub(/#/, "", "g", format)
+      tmpout = sprintf(tmpfmt, value)
+      if (tmpout ~ /^ *$/)
+	format = tmpfmt
+    }
+  # AWK interpretes input opportunistically as a number, which interferes
+  # with how the 'c' conversion works: "a" input will result in "a" output
+  # however "0" input will result in "^@" output rather than "0".  Force
+  # the value to be interpreted as a string then, by appending "".
+  output = sprintf(format, value "")
+  # Make up for various anomalies with the handling of +/-Inf and +/-NaN
+  # values and reprint the output produced using the string conversion,
+  # with the field width carried over and the relevant flags handled by
+  # hand.
+  if (format ~ /[EFGefg]/ && value ~ /(INF|NAN|inf|nan)/)
+    {
+      minus = format ~ /-/ ? "-" : ""
+      sign = value ~ /-/ ? "-" : format ~ /\+/ ? "+" : format ~ / / ? " " : ""
+      if (format ~ /^%[^\.1-9]*[1-9][0-9]*/)
+	width = gensub(/^%[^\.1-9]*([1-9][0-9]*).*$/, "\\1", 1, format)
+      else
+	width = ""
+      output = gensub(/[-+ ]/, "", "g", output)
+      output = sprintf("%" minus width "s", sign output)
+    }
+  # Produce "+" where the '+' flag has been used with a signed integer
+  # conversion for zero value, observing any field width in effect.
+  # In that case "+" is always supposed to be produced, but with the
+  # precision of zero gawk in the non-bignum mode produces any padding
+  # requested only.
+  else if (format ~ /\+.*[di]/ && value == 0)
+    {
+      output = gensub(/^( *) $/, format ~ /-/ ? "+\\1" : "\\1+", 1, output)
+      output = gensub(/^$/, "+", 1, output)
+    }
+  # Produce " " where the space flag has been used with a signed integer
+  # conversion for zero value.  In that case at least one " " is
+  # supposed to be produced, but with the precision of zero gawk in the
+  # non-bignum mode produces nothing.
+  else if (format ~ / .*[di]/ && value == 0)
+    {
+      output = gensub(/^$/, " ", 1, output)
+    }
+  if (output != input)
+    {
+      printf "(\"%s\"%s%s, %s) => \"%s\", expected \"%s\"\n", \
+	     $1, (NF > 2 ? ", " $2 : ""), (NF > 3 ? ", " $3 : ""), val, \
+	     input, output > "/dev/stderr"
+      status = 1
+    }
+  next
+}
+
+{
+  printf "unrecognized input: \"%s\"\n", $0 > "/dev/stderr"
+  status = 1
+}
+
+END {
+  exit status
+}
diff --git a/stdio-common/tst-printf-format.sh b/stdio-common/tst-printf-format.sh
new file mode 100644
index 0000000000..466c4a5f4f
--- /dev/null
+++ b/stdio-common/tst-printf-format.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+# Formatted printf output test script dispatcher.
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+set -e
+
+output=${1##*/}; shift
+
+tmp=${output#tst-printf-format-}
+tmp=${tmp%.out}
+
+# We are given the name of the make target in $1.  With the common prefix
+# and suffix both removed we are left with the inner part, which encodes
+# the function under test, the conversion type, and optionally the format
+# specifier, all separated with hyphens, i.e. F-T-S or F-T.  Extract them
+# and call the script corresponding to the conversion type, passing the
+# function under test and any format specifier as arguments.
+
+xprintf=${tmp%%-*}; tmp=${tmp#*-}
+conv=${tmp%%-*}; tmp=${tmp#${conv}}
+fmt=${tmp#*-}
+script=tst-printf-format-$conv.sh
+
+exec ${BASH:-bash} $script $xprintf $fmt "$@"