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-rw-r--r--gl/m4/strstr.m467
1 files changed, 43 insertions, 24 deletions
diff --git a/gl/m4/strstr.m4 b/gl/m4/strstr.m4
index c486bdb..7de203a 100644
--- a/gl/m4/strstr.m4
+++ b/gl/m4/strstr.m4
@@ -1,5 +1,5 @@
1# strstr.m4 serial 16 1# strstr.m4 serial 24
2dnl Copyright (C) 2008-2013 Free Software Foundation, Inc. 2dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation 3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it, 4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved. 5dnl with or without modifications, as long as this notice is preserved.
@@ -7,30 +7,40 @@ dnl with or without modifications, as long as this notice is preserved.
7dnl Check that strstr works. 7dnl Check that strstr works.
8AC_DEFUN([gl_FUNC_STRSTR_SIMPLE], 8AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
9[ 9[
10 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) 10 AC_REQUIRE([gl_STRING_H_DEFAULTS])
11 AC_REQUIRE([gl_FUNC_MEMCHR]) 11 AC_REQUIRE([gl_FUNC_MEMCHR])
12 if test "$gl_cv_func_memchr_works" != yes; then 12 if test $REPLACE_MEMCHR = 1; then
13 REPLACE_STRSTR=1 13 REPLACE_STRSTR=1
14 else 14 else
15 dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092. 15 dnl Detect https://sourceware.org/bugzilla/show_bug.cgi?id=12092
16 dnl and https://sourceware.org/bugzilla/show_bug.cgi?id=23637.
16 AC_CACHE_CHECK([whether strstr works], 17 AC_CACHE_CHECK([whether strstr works],
17 [gl_cv_func_strstr_works_always], 18 [gl_cv_func_strstr_works_always],
18 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 19 [AC_RUN_IFELSE(
19#include <string.h> /* for strstr */ 20 [AC_LANG_PROGRAM([[
21#include <string.h> /* for __GNU_LIBRARY__, strstr */
22#ifdef __GNU_LIBRARY__
23 #include <features.h>
24 #if __GLIBC__ == 2 && __GLIBC_MINOR__ == 28
25 Unlucky user
26 #endif
27#endif
20#define P "_EF_BF_BD" 28#define P "_EF_BF_BD"
21#define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P 29#define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P
22#define NEEDLE P P P P P 30#define NEEDLE P P P P P
23]], [[return !!strstr (HAYSTACK, NEEDLE); 31]],
24 ]])], 32 [[return !!strstr (HAYSTACK, NEEDLE);
25 [gl_cv_func_strstr_works_always=yes], 33 ]])],
26 [gl_cv_func_strstr_works_always=no], 34 [gl_cv_func_strstr_works_always=yes],
27 [dnl glibc 2.12 and cygwin 1.7.7 have a known bug. uClibc is not 35 [gl_cv_func_strstr_works_always=no],
28 dnl affected, since it uses different source code for strstr than 36 [dnl glibc 2.12 and cygwin 1.7.7 have a known bug. uClibc is not
29 dnl glibc. 37 dnl affected, since it uses different source code for strstr than
30 dnl Assume that it works on all other platforms, even if it is not 38 dnl glibc.
31 dnl linear. 39 dnl Assume that it works on all other platforms, even if it is not
32 AC_EGREP_CPP([Lucky user], 40 dnl linear.
33 [ 41 AC_EGREP_CPP([Lucky user],
42 [
43#include <string.h> /* for __GNU_LIBRARY__ */
34#ifdef __GNU_LIBRARY__ 44#ifdef __GNU_LIBRARY__
35 #include <features.h> 45 #include <features.h>
36 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \ 46 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
@@ -45,10 +55,10 @@ AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
45#else 55#else
46 Lucky user 56 Lucky user
47#endif 57#endif
48 ], 58 ],
49 [gl_cv_func_strstr_works_always="guessing yes"], 59 [gl_cv_func_strstr_works_always="guessing yes"],
50 [gl_cv_func_strstr_works_always="guessing no"]) 60 [gl_cv_func_strstr_works_always="$gl_cross_guess_normal"])
51 ]) 61 ])
52 ]) 62 ])
53 case "$gl_cv_func_strstr_works_always" in 63 case "$gl_cv_func_strstr_works_always" in
54 *yes) ;; 64 *yes) ;;
@@ -67,11 +77,17 @@ AC_DEFUN([gl_FUNC_STRSTR],
67 AC_CACHE_CHECK([whether strstr works in linear time], 77 AC_CACHE_CHECK([whether strstr works in linear time],
68 [gl_cv_func_strstr_linear], 78 [gl_cv_func_strstr_linear],
69 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 79 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
80#ifdef __MVS__
81/* z/OS does not deliver signals while strstr() is running (thanks to
82 restrictions on its LE runtime), which prevents us from limiting the
83 running time of this test. */
84# error "This test does not work properly on z/OS"
85#endif
70#include <signal.h> /* for signal */ 86#include <signal.h> /* for signal */
71#include <string.h> /* for strstr */ 87#include <string.h> /* for strstr */
72#include <stdlib.h> /* for malloc */ 88#include <stdlib.h> /* for malloc */
73#include <unistd.h> /* for alarm */ 89#include <unistd.h> /* for alarm */
74static void quit (int sig) { exit (sig + 128); } 90static void quit (int sig) { _exit (sig + 128); }
75]], [[ 91]], [[
76 int result = 0; 92 int result = 0;
77 size_t m = 1000000; 93 size_t m = 1000000;
@@ -93,6 +109,9 @@ static void quit (int sig) { exit (sig + 128); }
93 if (!strstr (haystack, needle)) 109 if (!strstr (haystack, needle))
94 result |= 1; 110 result |= 1;
95 } 111 }
112 /* Free allocated memory, in case some sanitizer is watching. */
113 free (haystack);
114 free (needle);
96 return result; 115 return result;
97 ]])], 116 ]])],
98 [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no], 117 [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
@@ -117,7 +136,7 @@ static void quit (int sig) { exit (sig + 128); }
117#endif 136#endif
118 ], 137 ],
119 [gl_cv_func_strstr_linear="guessing yes"], 138 [gl_cv_func_strstr_linear="guessing yes"],
120 [gl_cv_func_strstr_linear="guessing no"]) 139 [gl_cv_func_strstr_linear="$gl_cross_guess_normal"])
121 ]) 140 ])
122 ]) 141 ])
123 case "$gl_cv_func_strstr_linear" in 142 case "$gl_cv_func_strstr_linear" in