Refactor *cvt functions implementation (1/2)

This patch refactors the *cvt functions implementation in a way that
makes it easier to re-use them for implementing the IEEE long double on
powerpc64le.  By splitting the implementation per se in one file
(efgcvt-template.c) and the alias definitions in others (e.g. efgcvt.c),
the new code makes it easier to define new function names, such as
__qecvtieee128.

Tested that installed stripped binaries for all build-many-glibcs
targets remain identical before and after this patch.  Also tested for
powerpc64le and x86_64.

Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/misc/efgcvt-template.c b/misc/efgcvt-template.c
new file mode 100644
index 0000000000..aeb4e1ea01
--- /dev/null
+++ b/misc/efgcvt-template.c
@@ -0,0 +1,78 @@
+/* Compatibility functions for floating point formatting.
+   Copyright (C) 1995-2019 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 <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/param.h>
+#include <libc-lock.h>
+#include <math_ldbl_opt.h>
+
+#define APPEND(a, b) APPEND2 (a, b)
+#define APPEND2(a, b) a##b
+#define __APPEND(a, b) __APPEND2 (a, b)
+#define __APPEND2(a, b) __##a##b
+
+
+#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
+#define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr)
+#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
+
+
+static char FCVT_BUFFER[MAXDIG];
+static char ECVT_BUFFER[MAXDIG];
+libc_freeres_ptr (static char *FCVT_BUFPTR);
+
+char *
+__APPEND (FUNC_PREFIX, fcvt) (FLOAT_TYPE value, int ndigit, int *decpt,
+			      int *sign)
+{
+  if (FCVT_BUFPTR == NULL)
+    {
+      if (__APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
+					  FCVT_BUFFER, MAXDIG) != -1)
+	return FCVT_BUFFER;
+
+      FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG);
+      if (FCVT_BUFPTR == NULL)
+	return FCVT_BUFFER;
+    }
+
+  (void) __APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
+					 FCVT_BUFPTR, FCVT_MAXDIG);
+
+  return FCVT_BUFPTR;
+}
+
+
+char *
+__APPEND (FUNC_PREFIX, ecvt) (FLOAT_TYPE value, int ndigit, int *decpt,
+			      int *sign)
+{
+  (void) __APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign,
+					 ECVT_BUFFER, MAXDIG);
+
+  return ECVT_BUFFER;
+}
+
+char *
+__APPEND (FUNC_PREFIX, gcvt) (FLOAT_TYPE value, int ndigit, char *buf)
+{
+  sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
+  return buf;
+}