Add withstdinas

author: Laurent Bercot <ska-skaware@skarnet.org> 2015-08-14 23:29:04 +0000
committer: Laurent Bercot <ska-skaware@skarnet.org> 2015-08-14 23:29:04 +0000
commit: d0996a25bd4030875fbc98cabea815dd6741dd0d (patch)
tree: 49295e4681122292d33a6a4362390e912e771a25
parent: 9212da01bbaa900dbff8aca9b07b92d821251df2 (diff)
download: execline-d0996a25bd4030875fbc98cabea815dd6741dd0d.tar.gz
execline-d0996a25bd4030875fbc98cabea815dd6741dd0d.tar.xz
execline-d0996a25bd4030875fbc98cabea815dd6741dd0d.zip
12 files changed, 237 insertions, 77 deletions
diff --git a/doc/backtick.html b/doc/backtick.html
index df351f2..6aa2f01 100644
--- a/doc/backtick.html
+++ b/doc/backtick.html
@@ -19,8 +19,8 @@
 <h1> The <tt>backtick</tt> program </h1>
 
 <p>
-<tt>backtick</tt> runs a program and uses its output as the argument of
-another program.
+<tt>backtick</tt> runs a program and stores its output in an
+environment variable, then executes another program.
 </p>
 
 <h2> Interface </h2>
@@ -47,8 +47,8 @@ output as a value. </li>
 
 <ul>
  <li> <tt>-i</tt>&nbsp;: insist. If <em>prog1</em> crashes or exits non-zero,
-<tt>backtick</tt> exits with the same exit code (or 111 if <em>prog1</em>
-crashed). </li>
+<tt>backtick</tt> exits with an
+<a href="exitcodes.html">approximation</a> of the same exit code. </li>
  <li> <tt>-D&nbsp;<em>default</em></tt>&nbsp;: default value. If
 <em>prog1</em> crashes or exits non-zero, <em>default</em> is used as
 <em>variable</em>'s value. If neither the <tt>-i</tt> nor the <tt>-D</tt>
diff --git a/doc/index.html b/doc/index.html
index 9772ccb..1b61375 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -131,13 +131,13 @@ to your installation: the shebang lines for your system might be something like
 <li><a href="redirfd.html">The <tt>redirfd</tt> program</a></li>
 <li><a href="piperw.html">The <tt>piperw</tt> program</a></li>
 <li><a href="heredoc.html">The <tt>heredoc</tt> program</a></li>
-<li><a href="pipeline.html">The <tt>pipeline</tt> program</a></li>
 <li><a href="wait.html">The <tt>wait</tt> program</a></li>
 <li><a href="getpid.html">The <tt>getpid</tt> program</a></li>
 <li><a href="exec.html">The <tt>exec</tt> program</a></li>
 <li><a href="tryexec.html">The <tt>tryexec</tt> program</a></li>
 <li><a href="exit.html">The <tt>exit</tt> program</a></li>
 <li><a href="trap.html">The <tt>trap</tt> program</a></li>
+<li><a href="withstdinas.html">The <tt>withstdinas</tt> program</a></li>
 </ul>
 <p>
  (<a href="el_semicolon.html">Basic block management</a>)
@@ -150,6 +150,7 @@ to your installation: the shebang lines for your system might be something like
 <li><a href="ifte.html">The <tt>ifte</tt> program</a></li>
 <li><a href="ifthenelse.html">The <tt>ifthenelse</tt> program</a></li>
 <li><a href="backtick.html">The <tt>backtick</tt> program</a></li>
+<li><a href="pipeline.html">The <tt>pipeline</tt> program</a></li>
 <li><a href="runblock.html">The <tt>runblock</tt> program</a></li>
 </ul>
 <p>
diff --git a/doc/upgrade.html b/doc/upgrade.html
index 11ecd0a..6013a41 100644
--- a/doc/upgrade.html
+++ b/doc/upgrade.html
@@ -22,6 +22,9 @@
 
 <ul>
  <li> New <tt>EXECLINE_BLOCK_END_STRING</tt> and <tt>EXECLINE_BLOCK_QUOTE_STRING</tt> macros </li>
+ <li> New command: <a href="withstdinas.html">withstdinas</a>. It's a simplification
+of <a href="backtick.html">backtick</a>, which is now implemented as a combination of
+<a href="pipeline.html">pipeline</a> and <a href="withstdinas.html">withstdinas</a>. </li>
 </ul>
 
 <h2> in 2.1.3.1 </h2>
diff --git a/doc/withstdinas.html b/doc/withstdinas.html
new file mode 100644
index 0000000..29ad1b6
--- /dev/null
+++ b/doc/withstdinas.html
@@ -0,0 +1,67 @@
+<html>
+  <head>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+ <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+ <meta http-equiv="Content-Language" content="en" />
+ <title>execline: the withstdinas command</title>
+ <meta name="Description" content="execline: the withstdinas command" />
+ <meta name="Keywords" content="execline command withstdinas" />
+ <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> -->
+</head>
+<body>
+
+<p>
+<a href="index.html">execline</a><br />
+<a href="http://skarnet.org/software/">Software</a><br />
+<a href="http://skarnet.org/">skarnet.org</a>
+</p>
+
+<h1> The <tt>withstdinas</tt> program </h1>
+
+<p>
+<tt>withstdinas</tt> reads the entirety of its standard input in an
+environment variable, and runs another program with that additional
+environment variable.
+</p>
+
+<h2> Interface </h2>
+
+<p>
+ In an <a href="execlineb.html">execlineb</a> script:
+</p>
+
+<pre>
+     withstdinas [ -i | -D <em>default</em> ] [ -n ] <em>variable</em> <em>prog...</em>
+</pre>
+
+<ul>
+ <li> <tt>withstdinas</tt> reads its stdin until EOF. </li>
+ <li> It then execs into <em>prog...</em>, with
+<em>variable</em> added to the environment; the value of
+<em>variable</em> is what was read on stdin. </li>
+</ul>
+
+<h2> Options </h2>
+
+<ul>
+ <li> <tt>-i</tt>&nbsp;: insist. If the data on stdin is invalid as
+an environment variable, for instance if it contains a null
+character, <tt>withstdinas</tt> exits 1. </li>
+ <li> <tt>-D&nbsp;<em>default</em></tt>&nbsp;: default value.
+If the data on stdin is invalid, <em>default</em> is used as
+<em>variable</em>'s value. If neither the <tt>-i</tt> nor the <tt>-D</tt>
+option have been given, <tt>withstdinas</tt> execs into
+<em>prog...</em> with <em>variable</em> containing whatever value could be read on stdin,
+cut before the first null character. </li>
+ <li> <tt>-n</tt>&nbsp;: chomp an ending newline off stdin. </li>
+</ul>
+
+<h2> Notes </h2>
+
+<ul>
+ <li> You can start <em>prog...</em> with "import -u <em>variable</em>"
+to perform variable substitution. </li>
+</ul>
+
+</body>
+</html>
diff --git a/package/deps.mak b/package/deps.mak
index a558885..d5b5fe9 100644
--- a/package/deps.mak
+++ b/package/deps.mak
@@ -3,7 +3,7 @@
 #
 
 src/execline/background.o src/execline/background.lo: src/execline/background.c src/include/execline/execline.h
-src/execline/backtick.o src/execline/backtick.lo: src/execline/backtick.c src/include/execline/execline.h
+src/execline/backtick.o src/execline/backtick.lo: src/execline/backtick.c src/include/execline/config.h src/include/execline/execline.h
 src/execline/cd.o src/execline/cd.lo: src/execline/cd.c
 src/execline/define.o src/execline/define.lo: src/execline/define.c src/include-local/exlsn.h
 src/execline/dollarat.o src/execline/dollarat.lo: src/execline/dollarat.c
@@ -46,6 +46,7 @@ src/execline/tryexec.o src/execline/tryexec.lo: src/execline/tryexec.c src/inclu
 src/execline/umask.o src/execline/umask.lo: src/execline/umask.c
 src/execline/unexport.o src/execline/unexport.lo: src/execline/unexport.c
 src/execline/wait.o src/execline/wait.lo: src/execline/wait.c src/include/execline/execline.h
+src/execline/withstdinas.o src/execline/withstdinas.lo: src/execline/withstdinas.c
 src/libexecline/el_execsequence.o src/libexecline/el_execsequence.lo: src/libexecline/el_execsequence.c src/include/execline/execline.h
 src/libexecline/el_getstrict.o src/libexecline/el_getstrict.lo: src/libexecline/el_getstrict.c src/include/execline/execline.h
 src/libexecline/el_parse.o src/libexecline/el_parse.lo: src/libexecline/el_parse.c src/include/execline/execline.h
@@ -73,7 +74,7 @@ src/libexecline/exlsn_multidefine.o src/libexecline/exlsn_multidefine.lo: src/li
 background: private EXTRA_LIBS :=
 background: src/execline/background.o ${LIBEXECLINE} -lskarnet
 backtick: private EXTRA_LIBS :=
-backtick: src/execline/backtick.o ${LIBEXECLINE} -lskarnet
+backtick: src/execline/backtick.o -lskarnet
 cd: private EXTRA_LIBS :=
 cd: src/execline/cd.o -lskarnet
 define: private EXTRA_LIBS :=
@@ -158,6 +159,8 @@ unexport: private EXTRA_LIBS :=
 unexport: src/execline/unexport.o -lskarnet
 wait: private EXTRA_LIBS :=
 wait: src/execline/wait.o ${LIBEXECLINE} -lskarnet
+withstdinas: private EXTRA_LIBS :=
+withstdinas: src/execline/withstdinas.o -lskarnet
 libexecline.a.xyzzy: src/libexecline/el_execsequence.o src/libexecline/el_getstrict.o src/libexecline/el_parse.o src/libexecline/el_parse_from_buffer.o src/libexecline/el_parse_from_string.o src/libexecline/el_popenv.o src/libexecline/el_pushenv.o src/libexecline/el_semicolon.o src/libexecline/el_spawn0.o src/libexecline/el_spawn1.o src/libexecline/el_substandrun.o src/libexecline/el_substandrun_str.o src/libexecline/el_substitute.o src/libexecline/el_transform.o src/libexecline/el_vardupl.o src/libexecline/exlsn_define.o src/libexecline/exlsn_elglob.o src/libexecline/exlsn_import.o src/libexecline/exlsn_multidefine.o src/libexecline/exlsn_exlp.o src/libexecline/exlsn_main.o src/libexecline/exlsn_free.o src/libexecline/exlp.o
 libexecline.so.xyzzy: private EXTRA_LIBS := -lskarnet
 libexecline.so.xyzzy: src/libexecline/el_execsequence.lo src/libexecline/el_getstrict.lo src/libexecline/el_parse.lo src/libexecline/el_parse_from_buffer.lo src/libexecline/el_parse_from_string.lo src/libexecline/el_popenv.lo src/libexecline/el_pushenv.lo src/libexecline/el_semicolon.lo src/libexecline/el_spawn0.lo src/libexecline/el_spawn1.lo src/libexecline/el_substandrun.lo src/libexecline/el_substandrun_str.lo src/libexecline/el_substitute.lo src/libexecline/el_transform.lo src/libexecline/el_vardupl.lo src/libexecline/exlsn_define.lo src/libexecline/exlsn_elglob.lo src/libexecline/exlsn_import.lo src/libexecline/exlsn_multidefine.lo src/libexecline/exlsn_exlp.lo src/libexecline/exlsn_main.lo src/libexecline/exlsn_free.lo src/libexecline/exlp.lo
diff --git a/package/modes b/package/modes
index b1d0883..29a5813 100644
--- a/package/modes
+++ b/package/modes
@@ -42,3 +42,4 @@ tryexec			0755
 umask			0755
 unexport		0755
 wait			0755
+withstdinas		0755
diff --git a/package/targets.mak b/package/targets.mak
index b26ed04..09ad2f1 100644
--- a/package/targets.mak
+++ b/package/targets.mak
@@ -42,7 +42,8 @@ trap \
 tryexec \
 umask \
 unexport \
-wait
+wait \
+withstdinas
 
 SBIN_TARGETS :=
 LIBEXEC_TARGETS :=
diff --git a/src/execline/backtick.c b/src/execline/backtick.c
index 844882b..41b95d6 100644
--- a/src/execline/backtick.c
+++ b/src/execline/backtick.c
@@ -1,92 +1,83 @@
 /* ISC license. */
 
-#include <sys/types.h>
-#include <sys/wait.h>
 #include <unistd.h>
-#include <skalibs/bytestr.h>
+#include <errno.h>
+#include <skalibs/uint.h>
 #include <skalibs/sgetopt.h>
 #include <skalibs/strerr2.h>
-#include <skalibs/stralloc.h>
 #include <skalibs/djbunix.h>
+#include <execline/config.h>
 #include <execline/execline.h>
 
-#define USAGE "backtick [ -i | -D default ] [ -n ] var { prog... } remainder..."
+#define USAGE "backtick [ -i | -D default ] [ -n ] var { prog... } command..."
 #define dieusage() strerr_dieusage(100, USAGE)
 
-int main (int argc, char const **argv, char const *const *envp)
+int main (int argc, char const *const *argv, char const *const *envp)
 {
-  subgetopt_t localopt = SUBGETOPT_ZERO ;
-  pid_t pid ;
-  int argc1, fdwstat ;
-  stralloc modif = STRALLOC_ZERO ;
-  unsigned int modifstart ;
-  int insist = 0, chomp = 0 ;
   char const *def = 0 ;
+  int insist = 0, chomp = 0 ;
   PROG = "backtick" ;
-  for (;;)
   {
-    register int opt = subgetopt_r(argc, argv, "einD:", &localopt) ;
-    if (opt < 0) break ;
-    switch (opt)
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
     {
-      case 'i' : insist = 1 ; break ;
-      case 'n' : chomp = 1 ; break ;
-      case 'e' : break ; /* compat */
-      case 'D' : def = localopt.arg ; break ;
-      default : dieusage() ;
+      register int opt = subgetopt_r(argc, argv, "eniD:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+	case 'e' : break ; /* compat */
+        case 'n' : chomp = 1 ; break ;
+        case 'i' : insist = 1 ; break ;
+        case 'D' : def = l.arg ; break ;
+        default : dieusage() ;
+      }
     }
+    argc -= l.ind ; argv += l.ind ;
   }
-  argc -= localopt.ind ; argv += localopt.ind ;
-
   if (argc < 2) dieusage() ;
-  if (!*argv[0]) strerr_dief1x(100, "empty variable not accepted") ;
-  if (!stralloc_cats(&modif, argv[0]) || !stralloc_catb(&modif, "=", 1))
-    strerr_diefu1sys(111, "stralloc_catb") ;
-  modifstart = modif.len ;
-  argc-- ; argv++ ;
-  argc1 = el_semicolon(argv) ;
-  if (!argc1) strerr_dief1x(100, "empty block") ;
-  if (argc1 >= argc) strerr_dief1x(100, "unterminated block") ;
-
-  argv[argc1] = 0 ;
-  pid = child_spawn1_pipe(argv[0], argv, envp, &fdwstat, 1) ;
-  if (!pid) strerr_diefu2sys(111, "spawn ", argv[0]) ;
-  if (!slurp(&modif, fdwstat)) strerr_diefu1sys(111, "slurp") ;
-  close(fdwstat) ;
-  if (wait_pid(pid, &fdwstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
-
-  if (wait_status(fdwstat))
+  if (!argv[0][0]) dieusage() ;
+  if (!argv[1][0]) strerr_dief1x(100, "empty block") ;
   {
-    if (insist)
-      if (WIFSIGNALED(fdwstat)) strerr_dief1x(111, "child process crashed") ;
-      else strerr_dief1x(WEXITSTATUS(fdwstat), "child process exited non-zero") ;
-    else if (def)
+    unsigned int m = 0, i = 1 ;
+    int fd = dup(0) ;
+    char const *newargv[argc + 15] ;
+    char fmt[UINT_FMT] ;
+    if (fd < 0)
     {
-      modif.len = modifstart ;
-      if (!stralloc_cats(&modif, def)) strerr_diefu1sys(111, "stralloc_catb") ;
+      if (errno != EBADF) strerr_diefu1sys(111, "dup stdin") ;
     }
-  }
-  if (argc == argc1 - 1) return 0 ;
-  if (!stralloc_0(&modif)) strerr_diefu1sys(111, "stralloc_catb") ;
-  {
-    unsigned int reallen = str_len(modif.s) ;
-    if (reallen < modif.len - 1)
+    else fmt[uint_fmt(fmt, (unsigned int)fd)] = 0 ;
+    newargv[m++] = EXECLINE_BINPREFIX "pipeline" ;
+    newargv[m++] = "--" ;
+    while (argv[i] && argv[i][0] != EXECLINE_BLOCK_END_CHAR && (!EXECLINE_BLOCK_END_CHAR || (argv[i][0] && argv[i][1])))
+      newargv[m++] = argv[i++] ;
+    if (!argv[i]) strerr_dief1x(100, "unterminated block") ;
+    newargv[m++] = "" ; i++ ;
+    newargv[m++] = EXECLINE_BINPREFIX "withstdinas" ;
+    if (insist) newargv[m++] = "-i" ;
+    if (chomp) newargv[m++] = "-n" ;
+    if (def)
     {
-      if (insist)
-        strerr_dief1x(1, "child process output contained a null character") ;
-      else if (def)
-      {
-        modif.len = modifstart ;
-        if (!stralloc_catb(&modif, def, str_len(def)+1))
-          strerr_diefu1sys(111, "stralloc_catb") ;
-        strerr_warnw2x("child process output contained a null character", " - using default instead") ;
-      }
-      else
-        modif.len = reallen + 1 ;
+      newargv[m++] = "-D" ;
+      newargv[m++] = def ;
+    }
+    newargv[m++] = "-!" ;
+    newargv[m++] = "--" ;
+    newargv[m++] = argv[0] ;
+    if (fd < 0)
+    {
+      newargv[m++] = EXECLINE_BINPREFIX "fdclose" ;
+      newargv[m++] = "0" ;
+    }
+    else
+    {
+      newargv[m++] = EXECLINE_BINPREFIX "fdmove" ;
+      newargv[m++] = "0" ;
+      newargv[m++] = fmt ;
     }
-    if (chomp && (modif.s[modif.len - 2] == '\n'))
-      modif.s[--modif.len - 1] = 0 ;
+    while (argv[i]) newargv[m++] = argv[i++] ;
+    newargv[m++] = 0 ;
+    pathexec_run(newargv[0], newargv, envp) ;
+    strerr_dieexec(111, newargv[0]) ;
   }
-  pathexec_r(argv + argc1 + 1, envp, env_len(envp), modif.s, modif.len) ;
-  strerr_dieexec(111, argv[argc1 + 1]) ;
 }
diff --git a/src/execline/deps-exe/backtick b/src/execline/deps-exe/backtick
index 97021b5..e7187fe 100644
--- a/src/execline/deps-exe/backtick
+++ b/src/execline/deps-exe/backtick
@@ -1,2 +1 @@
-${LIBEXECLINE}
 -lskarnet
diff --git a/src/execline/deps-exe/withstdinas b/src/execline/deps-exe/withstdinas
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/execline/deps-exe/withstdinas
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/execline/forbacktickx.c b/src/execline/forbacktickx.c
index 9301581..c0c617a 100644
--- a/src/execline/forbacktickx.c
+++ b/src/execline/forbacktickx.c
@@ -16,7 +16,7 @@
 
 #define DELIM_DEFAULT " \n\r\t"
 
-int main (int argc, char const **argv, char const *const *envp)
+int main (int argc, char const *const *argv, char const *const *envp)
 {
   char const *delim = DELIM_DEFAULT ;
   char const *codes = 0 ;
diff --git a/src/execline/withstdinas.c b/src/execline/withstdinas.c
new file mode 100644
index 0000000..c1e3c36
--- /dev/null
+++ b/src/execline/withstdinas.c
@@ -0,0 +1,93 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <skalibs/uint64.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+#define USAGE "withstdinas [ -i | -D default ] [ -n ] var remainder..."
+#define dieusage() strerr_dieusage(100, USAGE)
+
+int main (int argc, char const **argv, char const *const *envp)
+{
+  subgetopt_t localopt = SUBGETOPT_ZERO ;
+  stralloc modif = STRALLOC_ZERO ;
+  unsigned int modifstart ;
+  int insist = 0, chomp = 0, reapit = 0 ;
+  char const *def = 0 ;
+  PROG = "withstdinas" ;
+  for (;;)
+  {
+    register int opt = subgetopt_r(argc, argv, "einD:!", &localopt) ;
+    if (opt < 0) break ;
+    switch (opt)
+    {
+      case 'i' : insist = 1 ; break ;
+      case 'n' : chomp = 1 ; break ;
+      case 'D' : def = localopt.arg ; break ;
+      case '!' : reapit = 1 ; break ;
+      default : dieusage() ;
+    }
+  }
+  argc -= localopt.ind ; argv += localopt.ind ;
+
+  if (!argc) dieusage() ;
+  if (!*argv[0] || strchr(argv[0], '=')) strerr_dief1x(100, "invalid variable name") ;
+  if (!stralloc_catb(&modif, "!", 2)
+   || !stralloc_cats(&modif, argv[0])
+   || !stralloc_catb(&modif, "=", 1))
+    strerr_diefu1sys(111, "stralloc_catb") ;
+  modifstart = modif.len ;
+  if (!slurp(&modif, 0)) strerr_diefu1sys(111, "slurp") ;
+  if (reapit)
+  {
+    char const *x = env_get2(envp, "!") ;
+    if (x)
+    {
+      uint64 pid ;
+      int wstat ;
+      if (!uint640_scan(x, &pid)) strerr_dieinvalid(100, "!") ;
+      if (waitpid(pid, &wstat, 0) < 0)
+        strerr_diefu1sys(111, "waitpid") ;
+      if (wait_estatus(wstat))
+      {
+        if (insist)
+          if (WIFSIGNALED(wstat)) strerr_dief1x(wait_estatus(wstat), "child process crashed") ;
+          else strerr_dief1x(wait_estatus(wstat), "child process exited non-zero") ;
+        else if (def)
+        {
+          modif.len = modifstart ;
+          if (!stralloc_cats(&modif, def)) strerr_diefu1sys(111, "stralloc_catb") ;
+        }
+      }
+    }
+  }
+  if (!stralloc_0(&modif)) strerr_diefu1sys(111, "stralloc_catb") ;
+  {
+    unsigned int reallen = str_len(modif.s + 2) ;
+    if (reallen < modif.len - 3)
+    {
+      if (insist)
+        strerr_dief1x(1, "stdin contained a null character") ;
+      else if (def)
+      {
+        modif.len = modifstart ;
+        if (!stralloc_catb(&modif, def, str_len(def)+1))
+          strerr_diefu1sys(111, "stralloc_catb") ;
+        strerr_warnw2x("stdin contained a null character", " - using default instead") ;
+      }
+      else
+        modif.len = reallen + 3 ;
+    }
+    if (chomp && (modif.s[modif.len - 2] == '\n'))
+      modif.s[--modif.len - 1] = 0 ;
+  }
+  if (!argv[1]) return 0 ;
+  pathexec_r(argv + 1, envp, env_len(envp), modif.s + !reapit * 2, modif.len - !reapit * 2) ;
+  strerr_dieexec(111, argv[1]) ;
+}
author	Laurent Bercot <ska-skaware@skarnet.org>	2015-08-14 23:29:04 +0000
committer	Laurent Bercot <ska-skaware@skarnet.org>	2015-08-14 23:29:04 +0000
commit	d0996a25bd4030875fbc98cabea815dd6741dd0d (patch)
tree	49295e4681122292d33a6a4362390e912e771a25
parent	9212da01bbaa900dbff8aca9b07b92d821251df2 (diff)
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