diff options
| author | Bruno Haible <bruno@clisp.org> | 2008-04-19 21:42:16 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2008-04-19 21:42:16 +0200 |
| commit | 5fc2139cf34af9a059c76496c5b02eaf1ec3e3e8 (patch) | |
| tree | 1836c4ef7ed987ca12d81448e07338f2a65a40a3 /m4/printf.m4 | |
| parent | ee761da90342d654b308626640bfe1128a78a2ee (diff) | |
| download | gnulib-5fc2139cf34af9a059c76496c5b02eaf1ec3e3e8.tar.gz | |
Work around snprintf bug on Linux libc5.
Diffstat (limited to 'm4/printf.m4')
| -rw-r--r-- | m4/printf.m4 | 79 |
1 files changed, 53 insertions, 26 deletions
diff --git a/m4/printf.m4 b/m4/printf.m4 index b6f82b5a3c..d544edd72d 100644 --- a/m4/printf.m4 +++ b/m4/printf.m4 @@ -1,4 +1,4 @@ -# printf.m4 serial 22 +# printf.m4 serial 23 dnl Copyright (C) 2003, 2007-2008 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -1115,6 +1115,31 @@ changequote([,])dnl ]) ]) +dnl Test whether the snprintf function, when passed a size = 1, writes any +dnl output without bounds in this case, behaving like sprintf. This is the +dnl case on Linux libc5. +dnl Result is gl_cv_func_snprintf_size1. + +AC_DEFUN([gl_SNPRINTF_SIZE1], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_CACHE_CHECK([whether snprintf respects a size of 1], + [gl_cv_func_snprintf_size1], + [ + AC_TRY_RUN([ +#include <stdio.h> +int main() +{ + static char buf[8] = "DEADBEEF"; + snprintf (buf, 1, "%d", 12345); + return buf[1] != 'E'; +}], + [gl_cv_func_snprintf_size1=yes], + [gl_cv_func_snprintf_size1=no], + [gl_cv_func_snprintf_size1="guessing yes"]) + ]) +]) + dnl Test whether the vsnprintf function, when passed a zero size, produces no dnl output. (ISO C99, POSIX:2001) dnl For example, snprintf nevertheless writes a NUL byte in this case @@ -1234,7 +1259,8 @@ dnl 14 = gl_SNPRINTF_PRESENCE dnl 15 = gl_SNPRINTF_TRUNCATION_C99 dnl 16 = gl_SNPRINTF_RETVAL_C99 dnl 17 = gl_SNPRINTF_DIRECTIVE_N -dnl 18 = gl_VSNPRINTF_ZEROSIZE_C99 +dnl 18 = gl_SNPRINTF_SIZE1 +dnl 19 = gl_VSNPRINTF_ZEROSIZE_C99 dnl dnl 1 = checking whether printf supports size specifiers as in C99... dnl 2 = checking whether printf supports 'long double' arguments... @@ -1253,30 +1279,31 @@ dnl 14 = checking for snprintf... dnl 15 = checking whether snprintf truncates the result as in C99... dnl 16 = checking whether snprintf returns a byte count as in C99... dnl 17 = checking whether snprintf fully supports the 'n' directive... -dnl 18 = checking whether vsnprintf respects a zero size as in C99... +dnl 18 = checking whether snprintf respects a size of 1... +dnl 19 = checking whether vsnprintf respects a zero size as in C99... dnl dnl . = yes, # = no. dnl -dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 -dnl glibc 2.5 . . . . . . . . . . . . . . . . . . -dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . . -dnl FreeBSD 5.4, 6.1 . . . . # . . . . . # . # . . . . . -dnl MacOS X 10.3.9 . . . . # . . . . . # . # . . . . . -dnl OpenBSD 3.9, 4.0 . . # # # # . . # . # . # . . . . . -dnl Cygwin 2007 (= Cygwin 1.5.24) . . . . # # . . . ? # ? ? . . . . . -dnl Cygwin 2006 (= Cygwin 1.5.19) # . . . # # . . # ? # ? ? . . . . . -dnl Solaris 10 . . # # # . . . . . # . . . . . . . -dnl Solaris 2.6 ... 9 # . # # # # . . . . # . . . . . . . -dnl Solaris 2.5.1 # . # # # # . . . . # . . # # # # # -dnl AIX 5.2 . . # # # . . . . . # . . . . . . . -dnl AIX 4.3.2, 5.1 # . # # # # . . . . # . . . . . . . -dnl HP-UX 11.31 . . . . # . . . . . # . . . . # # . -dnl HP-UX 11.{00,11,23} # . . . # # . . . . # . . . . # # # -dnl HP-UX 10.20 # . . . # # . . . # # . . . . # # # -dnl IRIX 6.5 # . # # # # . . . . # . . . . # . . -dnl OSF/1 5.1 # . # # # # . . . . # . . . . # . # -dnl OSF/1 4.0d # . # # # # . . . . # . . # # # # # -dnl NetBSD 4.0 . ? ? ? ? ? . . ? ? ? ? ? . . . ? ? -dnl NetBSD 3.0 . . . . # # . # # ? # . # . . . . . -dnl BeOS # # . # # # . # . ? . # ? . . . . . -dnl mingw # # # # # # . # # . # # ? . # # # . +dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 +dnl glibc 2.5 . . . . . . . . . . . . . . . . . . . +dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . . . +dnl FreeBSD 5.4, 6.1 . . . . # . . . . . # . # . . . . . . +dnl MacOS X 10.3.9 . . . . # . . . . . # . # . . . . . . +dnl OpenBSD 3.9, 4.0 . . # # # # . . # . # . # . . . . . . +dnl Cygwin 2007 (= Cygwin 1.5.24) . . . . # # . . . ? # ? ? . . . . . . +dnl Cygwin 2006 (= Cygwin 1.5.19) # . . . # # . . # ? # ? ? . . . . . . +dnl Solaris 10 . . # # # . . . . . # . . . . . . . . +dnl Solaris 2.6 ... 9 # . # # # # . . . . # . . . . . . . . +dnl Solaris 2.5.1 # . # # # # . . . . # . . # # # # # # +dnl AIX 5.2 . . # # # . . . . . # . . . . . . . . +dnl AIX 4.3.2, 5.1 # . # # # # . . . . # . . . . . . . . +dnl HP-UX 11.31 . . . . # . . . . . # . . . . # # . . +dnl HP-UX 11.{00,11,23} # . . . # # . . . . # . . . . # # . # +dnl HP-UX 10.20 # . . . # # . . . # # . . . . # # ? # +dnl IRIX 6.5 # . # # # # . . . . # . . . . # . . . +dnl OSF/1 5.1 # . # # # # . . . . # . . . . # . . # +dnl OSF/1 4.0d # . # # # # . . . . # . . # # # # # # +dnl NetBSD 4.0 . ? ? ? ? ? . . ? ? ? ? ? . . . ? ? ? +dnl NetBSD 3.0 . . . . # # . # # ? # . # . . . . . . +dnl BeOS # # . # # # . # . ? . # ? . . . . . . +dnl mingw # # # # # # . # # . # # ? . # # # . . |