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62 lines
2.0 KiB
Plaintext
62 lines
2.0 KiB
Plaintext
# stpncpy.m4 serial 3
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dnl Copyright (C) 2002-2003, 2005 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_STPNCPY],
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[
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dnl Persuade glibc <string.h> to declare stpncpy().
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AC_REQUIRE([AC_GNU_SOURCE])
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dnl Both glibc and AIX (4.3.3, 5.1) have an stpncpy() function
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dnl declared in <string.h>. Its side effects are the same as those
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dnl of strncpy():
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dnl stpncpy (dest, src, n)
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dnl overwrites dest[0..n-1], min(strlen(src),n) bytes coming from src,
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dnl and the remaining bytes being NULs. However, the return value is
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dnl in glibc: dest + min(strlen(src),n)
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dnl in AIX: dest + max(0,n-1)
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dnl Only the glibc return value is useful in practice.
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AC_CACHE_CHECK([for working stpncpy], gl_cv_func_stpncpy, [
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AC_TRY_RUN([
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#include <stdlib.h>
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extern char *stpncpy (char *dest, const char *src, size_t n);
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int main () {
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const char *src = "Hello";
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char dest[10];
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/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+1 here. */
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strcpy (dest, "\377\377\377\377\377\377");
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if (stpncpy (dest, src, 2) != dest + 2) exit(1);
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/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+4 here. */
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strcpy (dest, "\377\377\377\377\377\377");
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if (stpncpy (dest, src, 5) != dest + 5) exit(1);
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/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+6 here. */
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strcpy (dest, "\377\377\377\377\377\377");
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if (stpncpy (dest, src, 7) != dest + 5) exit(1);
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exit(0);
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}
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], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no,
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[AC_EGREP_CPP([Thanks for using GNU], [
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#include <features.h>
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#ifdef __GNU_LIBRARY__
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Thanks for using GNU
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#endif
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], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no)])])
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if test $gl_cv_func_stpncpy = yes; then
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AC_DEFINE(HAVE_STPNCPY, 1,
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[Define if you have the stpncpy() function and it works.])
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else
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AC_LIBOBJ([stpncpy])
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gl_PREREQ_STPNCPY
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fi
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])
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# Prerequisites of lib/stpncpy.c.
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AC_DEFUN([gl_PREREQ_STPNCPY], [
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:
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])
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