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# stpncpy.m4 serial 10
dnl Copyright (C) 2002-2003, 2005-2007, 2009 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_STPNCPY],
[
dnl Persuade glibc <string.h> to declare stpncpy().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
dnl The stpncpy() declaration in lib/string.in.h uses 'restrict'.
AC_REQUIRE([AC_C_RESTRICT])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
dnl Both glibc and AIX (4.3.3, 5.1) have an stpncpy() function
dnl declared in <string.h>. Its side effects are the same as those
dnl of strncpy():
dnl stpncpy (dest, src, n)
dnl overwrites dest[0..n-1], min(strlen(src),n) bytes coming from src,
dnl and the remaining bytes being NULs. However, the return value is
dnl in glibc: dest + min(strlen(src),n)
dnl in AIX: dest + max(0,n-1)
dnl Only the glibc return value is useful in practice.
AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [
AC_TRY_RUN([
#include <stdlib.h>
#include <string.h> /* for strcpy */
/* The stpncpy prototype is missing in <string.h> on AIX 4. */
extern char *stpncpy (char *dest, const char *src, size_t n);
int main () {
const char *src = "Hello";
char dest[10];
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+1 here. */
strcpy (dest, "\377\377\377\377\377\377");
if (stpncpy (dest, src, 2) != dest + 2) exit(1);
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+4 here. */
strcpy (dest, "\377\377\377\377\377\377");
if (stpncpy (dest, src, 5) != dest + 5) exit(1);
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+6 here. */
strcpy (dest, "\377\377\377\377\377\377");
if (stpncpy (dest, src, 7) != dest + 5) exit(1);
exit(0);
}
], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no,
[AC_EGREP_CPP([Thanks for using GNU], [
#include <features.h>
#ifdef __GNU_LIBRARY__
Thanks for using GNU
#endif
], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no)])])
if test $gl_cv_func_stpncpy = yes; then
AC_DEFINE([HAVE_STPNCPY], [1],
[Define if you have the stpncpy() function and it works.])
else
HAVE_STPNCPY=0
AC_LIBOBJ([stpncpy])
gl_PREREQ_STPNCPY
fi
])
# Prerequisites of lib/stpncpy.c.
AC_DEFUN([gl_PREREQ_STPNCPY], [
:
])
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