new module 'vfprintf-posix'

[Bruno Haible]

Here comes the full POSIX variant of vfprintf.

2007-03-08  Bruno Haible  <address@hidden>

        * modules/vfprintf-posix: New file.
        * lib/vfprintf.c: New file.
        * m4/vfprintf-posix.m4: New file.
        * m4/stdio_h.m4 (gl_STDIO_H_DEFAULTS): Set also GNULIB_VFPRINTF_POSIX,
        REPLACE_VFPRINTF.
        * lib/stdio_.h (vfprintf): New declaration.
        * modules/stdio (Makefile.am): Substitute also GNULIB_VFPRINTF_POSIX,
        REPLACE_VFPRINTF.

=========================== modules/vfprintf-posix ============================
Description:
POSIX compatible vfprintf() function: print formatted output to a stream

Files:
lib/vfprintf.c
m4/vfprintf-posix.m4
m4/printf.m4

Depends-on:
stdio
fseterr
vasnprintf
isnan-nolibm
isnanl-nolibm
printf-frexp
printf-frexpl

configure.ac:
gl_FUNC_VFPRINTF_POSIX
gl_STDIO_MODULE_INDICATOR([vfprintf-posix])

Makefile.am:

Include:
<stdio.h>

License:
LGPL

Maintainer:
Bruno Haible

================================ lib/vfprintf.c ===============================
/* Formatted output to a stream.
   Copyright (C) 2004, 2006-2007 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include <stdio.h>

#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>

#include "fseterr.h"
#include "vasnprintf.h"

/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
#ifndef EOVERFLOW
# define EOVERFLOW E2BIG
#endif

/* Print formatted output to the stream FP.
   Return string length of formatted string.  On error, return a negative
   value.  */
int
vfprintf (FILE *fp, const char *format, va_list args)
{
  char buf[2000];
  char *output;
  size_t len;
  size_t lenbuf = sizeof (buf);

  output = vasnprintf (buf, &lenbuf, format, args);
  len = lenbuf;

  if (!output)
    {
      fseterr (fp);
      return -1;
    }

  if (fwrite (output, 1, len, fp) < len)
    {
      if (output != buf)
        {
          int saved_errno = errno;
          free (output);
          errno = saved_errno;
        }
      return -1;
    }

  if (len > INT_MAX)
    {
      errno = EOVERFLOW;
      fseterr (fp);
      return -1;
    }

  return len;
}
============================ m4/vfprintf-posix.m4 =============================
# vfprintf-posix.m4 serial 1
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_VFPRINTF_POSIX],
[
  AC_REQUIRE([gl_EOVERFLOW])
  AC_REQUIRE([gl_PRINTF_SIZES_C99])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
  AC_REQUIRE([gl_PRINTF_POSITIONS])
  gl_cv_func_vfprintf_posix=no
  case "$gl_cv_func_printf_sizes_c99" in
    *yes)
      case "$gl_cv_func_printf_directive_a" in
        *yes)
          case "$gl_cv_func_printf_directive_n" in
            *yes)
              case "$gl_cv_func_printf_positions" in
                *yes)
                  # vfprintf exists and is already POSIX compliant.
                  gl_cv_func_vfprintf_posix=yes
                  ;;
              esac
              ;;
          esac
          ;;
      esac
      ;;
  esac
  if test $gl_cv_func_vfprintf_posix = no; then
    if ! expr "$gl_cv_func_printf_directive_a" : ".*yes" > /dev/null; then
      AC_DEFINE([NEED_PRINTF_DIRECTIVE_A], 1,
        [Define if the vasnprintf implementation needs special code for
         the 'a' and 'A' directives.])
    fi
    gl_REPLACE_VASNPRINTF
    gl_REPLACE_VFPRINTF
  fi
])

AC_DEFUN([gl_REPLACE_VFPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_LIBOBJ([vfprintf])
  REPLACE_VFPRINTF=1
  gl_PREREQ_VFPRINTF
])

AC_DEFUN([gl_PREREQ_VFPRINTF], [:])
===============================================================================
*** lib/stdio_.h        9 Mar 2007 02:27:19 -0000       1.7
--- lib/stdio_.h        9 Mar 2007 02:33:12 -0000
***************
*** 40,45 ****
--- 40,59 ----
  #endif
  
  
+ #if @GNULIB_VFPRINTF_POSIX@
+ # if @REPLACE_VFPRINTF@
+ #  define vfprintf rpl_vfprintf
+ extern int vfprintf (FILE *fp, const char *format, va_list args);
+ # endif
+ #elif defined GNULIB_POSIXCHECK
+ # undef vfprintf
+ # define vfprintf(s,f,a) \
+     (GL_LINK_WARNING ("vfprintf is not always POSIX compliant - " \
+                       "use gnulib module vfprintf-posix for portable " \
+                       "POSIX compliance"), \
+      vfprintf (s, f, a))
+ #endif
+ 
  #if @GNULIB_SNPRINTF@
  # if @REPLACE_SNPRINTF@
  #  define snprintf rpl_snprintf
*** m4/stdio_h.m4       7 Mar 2007 03:47:50 -0000       1.5
--- m4/stdio_h.m4       9 Mar 2007 02:33:12 -0000
***************
*** 23,31 ****
--- 23,33 ----
  [
    GNULIB_SNPRINTF=0;       AC_SUBST([GNULIB_SNPRINTF])
    GNULIB_SPRINTF_POSIX=0;  AC_SUBST([GNULIB_SPRINTF_POSIX])
+   GNULIB_VFPRINTF_POSIX=0; AC_SUBST([GNULIB_VFPRINTF_POSIX])
    GNULIB_VSNPRINTF=0;      AC_SUBST([GNULIB_VSNPRINTF])
    GNULIB_VSPRINTF_POSIX=0; AC_SUBST([GNULIB_VSPRINTF_POSIX])
    dnl Assume proper GNU behavior unless another module says otherwise.
+   REPLACE_VFPRINTF=0;      AC_SUBST([REPLACE_VFPRINTF])
    REPLACE_SNPRINTF=0;      AC_SUBST([REPLACE_SNPRINTF])
    HAVE_DECL_SNPRINTF=1;    AC_SUBST([HAVE_DECL_SNPRINTF])
    REPLACE_VSNPRINTF=0;     AC_SUBST([REPLACE_VSNPRINTF])
*** modules/stdio       7 Mar 2007 03:47:50 -0000       1.5
--- modules/stdio       9 Mar 2007 02:33:12 -0000
***************
*** 23,30 ****
--- 23,32 ----
          sed -e 's|@''ABSOLUTE_STDIO_H''@|$(ABSOLUTE_STDIO_H)|g' \
              -e 's|@''GNULIB_SNPRINTF''@|$(GNULIB_SNPRINTF)|g' \
              -e 's|@''GNULIB_SPRINTF_POSIX''@|$(GNULIB_SPRINTF_POSIX)|g' \
+             -e 's|@''GNULIB_VFPRINTF_POSIX''@|$(GNULIB_VFPRINTF_POSIX)|g' \
              -e 's|@''GNULIB_VSNPRINTF''@|$(GNULIB_VSNPRINTF)|g' \
              -e 's|@''GNULIB_VSPRINTF_POSIX''@|$(GNULIB_VSPRINTF_POSIX)|g' \
+             -e 's|@''REPLACE_VFPRINTF''@|$(REPLACE_VFPRINTF)|g' \
              -e 's|@''REPLACE_SNPRINTF''@|$(REPLACE_SNPRINTF)|g' \
              -e 's|@''HAVE_DECL_SNPRINTF''@|$(HAVE_DECL_SNPRINTF)|g' \
              -e 's|@''REPLACE_VSNPRINTF''@|$(REPLACE_VSNPRINTF)|g' \