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94 lines
2.7 KiB
Text
94 lines
2.7 KiB
Text
# strncpy.m4
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# serial 1
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dnl Copyright (C) 2002-2004, 2009-2025 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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dnl This file is offered as-is, without any warranty.
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AC_DEFUN_ONCE([gl_FUNC_STRNCPY],
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[
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AC_REQUIRE([gl_STRING_H_DEFAULTS])
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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dnl Check for prerequisites for memory fence checks.
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gl_FUNC_MMAP_ANON
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AC_CHECK_HEADERS_ONCE([sys/mman.h])
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AC_CHECK_FUNCS_ONCE([mprotect])
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dnl Detect bug in FreeBSD 15.0 on x86_64:
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dnl strncpy should not dereference more than n bytes, but always dereferences
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dnl n+1 bytes if the first n bytes don't contain a NUL byte.
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dnl Assume that strncpy works on platforms that lack mprotect.
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AC_CACHE_CHECK([whether strncpy works], [gl_cv_func_strncpy_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <string.h>
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#if HAVE_SYS_MMAN_H
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# include <fcntl.h>
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# include <unistd.h>
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# include <sys/types.h>
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# include <sys/mman.h>
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#endif
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]GL_MDA_DEFINES],
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[[
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char *fence = NULL;
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#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
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{
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long int pagesize = sysconf (_SC_PAGESIZE);
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char *two_pages =
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(char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (two_pages != (char *)(-1)
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&& mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
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fence = two_pages + pagesize;
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}
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#endif
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if (fence)
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{
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char dest[8];
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dest[0] = 'a';
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dest[1] = 'b';
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dest[2] = 'c';
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dest[3] = 'd';
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dest[4] = 'e';
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dest[5] = 'f';
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dest[6] = 'g';
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*(fence - 3) = '7';
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*(fence - 2) = '2';
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*(fence - 1) = '9';
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if (strncpy (dest + 1, fence - 3, 3) != dest + 1)
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return 1;
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if (dest[0] != 'a')
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return 2;
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if (dest[1] != '7' || dest[2] != '2' || dest[3] != '9')
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return 3;
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if (dest[4] != 'e')
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return 4;
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}
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return 0;
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]])], [gl_cv_func_strncpy_works=yes], [gl_cv_func_strncpy_works=no],
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[
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case "$host_os" in
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# Guess no on FreeBSD.
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freebsd* | dragonfly*) gl_cv_func_strncpy_works="guessing no" ;;
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# Guess yes on native Windows.
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mingw* | windows*) gl_cv_func_strncpy_works="guessing yes" ;;
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# Guess yes otherwise.
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*) gl_cv_func_strncpy_works="guessing yes" ;;
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esac
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])
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])
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case "$gl_cv_func_strncpy_works" in
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*yes) ;;
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*) REPLACE_STRNCPY=1 ;;
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esac
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])
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# Prerequisites of lib/strncpy.c.
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AC_DEFUN([gl_PREREQ_STRNCPY], [
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:
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])
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