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Diffstat (limited to 'gnulib/m4/strndup.m4')
-rw-r--r-- | gnulib/m4/strndup.m4 | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gnulib/m4/strndup.m4 b/gnulib/m4/strndup.m4 new file mode 100644 index 0000000..1be2a85 --- /dev/null +++ b/gnulib/m4/strndup.m4 @@ -0,0 +1,53 @@ +# strndup.m4 serial 15 +dnl Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_STRNDUP], +[ + dnl Persuade glibc <string.h> to declare strndup(). + AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) + + AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) + AC_CHECK_DECLS_ONCE([strndup]) + if test $ac_cv_have_decl_strndup = no; then + HAVE_DECL_STRNDUP=0 + fi + + # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'. + AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup, + [AC_RUN_IFELSE([ + AC_LANG_PROGRAM([[#include <string.h> + #include <stdlib.h>]], [[ +#ifndef HAVE_DECL_STRNDUP + extern char *strndup (const char *, size_t); +#endif + char *s; + s = strndup ("some longer string", 15); + free (s); + s = strndup ("shorter string", 13); + return s[13] != '\0';]])], + [gl_cv_func_strndup=yes], + [gl_cv_func_strndup=no], + [AC_CHECK_FUNC([strndup], + [AC_EGREP_CPP([too risky], [ +#ifdef _AIX + too risky +#endif + ], + [gl_cv_func_strndup=no], + [gl_cv_func_strndup=yes])], + [gl_cv_func_strndup=no])])]) + if test $gl_cv_func_strndup = yes; then + AC_DEFINE([HAVE_STRNDUP], 1, + [Define if you have the strndup() function and it works.]) + else + HAVE_STRNDUP=0 + AC_LIBOBJ([strndup]) + gl_PREREQ_STRNDUP + fi +]) + +# Prerequisites of lib/strndup.c. +AC_DEFUN([gl_PREREQ_STRNDUP], [:]) |