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annotate m4/memmem.m4 @ 14434:7624b26aea3d

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sys_socket, netdb: Document problem with socklen_t. * doc/posix-headers/sys_socket.texi: Mention lack of socklen_t on some platforms. * doc/posix-headers/netdb.texi: Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 19 Mar 2011 13:39:12 +0100
parents 97fc9a21a8fb
children 577ff30eb284
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # memmem.m4 serial 22
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2 dnl Copyright (C) 2002-2004, 2007-2011 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl Check that memmem is present and functional.
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8 AC_DEFUN([gl_FUNC_MEMMEM_SIMPLE],
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9 [
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10 dnl Persuade glibc <string.h> to declare memmem().
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11 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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12
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13 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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14 AC_REPLACE_FUNCS([memmem])
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15 AC_CHECK_DECLS_ONCE([memmem])
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16 if test $ac_cv_have_decl_memmem = no; then
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17 HAVE_DECL_MEMMEM=0
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18 else
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19 dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092.
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20 dnl Also check that we handle empty needles correctly.
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21 AC_CACHE_CHECK([whether memmem works],
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22 [gl_cv_func_memmem_works_always],
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23 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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24 #include <string.h> /* for memmem */
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25 #define P "_EF_BF_BD"
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26 #define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P
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27 #define NEEDLE P P P P P
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28 ]], [[
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29 int result = 0;
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30 if (memmem (HAYSTACK, strlen (HAYSTACK), NEEDLE, strlen (NEEDLE)))
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31 result |= 1;
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32 /* Check for empty needle behavior. */
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33 {
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34 const char *haystack = "AAA";
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35 if (memmem (haystack, 3, NULL, 0) != haystack)
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36 result |= 2;
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37 }
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38 return result;
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39 ]])],
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40 [gl_cv_func_memmem_works_always=yes],
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41 [gl_cv_func_memmem_works_always=no],
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42 [dnl glibc 2.9..2.12 and cygwin 1.7.7 have issue #12092 above.
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43 dnl Also empty needles work on glibc >= 2.1 and cygwin >= 1.7.0.
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44 dnl uClibc is not affected, since it uses different source code.
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45 dnl Assume that it works on all other platforms (even if not linear).
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46 AC_EGREP_CPP([Lucky user],
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47 [
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48 #ifdef __GNU_LIBRARY__
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49 #include <features.h>
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50 #if ((__GLIBC__ == 2 && ((__GLIBC_MINOR > 0 && __GLIBC_MINOR__ < 9) \
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51 || __GLIBC_MINOR__ > 12)) \
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52 || (__GLIBC__ > 2)) \
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53 || defined __UCLIBC__
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54 Lucky user
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55 #endif
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56 #elif defined __CYGWIN__
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57 #include <cygwin/version.h>
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58 #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
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59 Lucky user
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60 #endif
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61 #else
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62 Lucky user
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63 #endif
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64 ],
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65 [gl_cv_func_memmem_works_always=yes],
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66 [gl_cv_func_memmem_works_always="guessing no"])
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67 ])
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68 ])
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69 if test "$gl_cv_func_memmem_works_always" != yes; then
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70 REPLACE_MEMMEM=1
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71 AC_LIBOBJ([memmem])
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72 fi
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73 fi
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74 gl_PREREQ_MEMMEM
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75 ]) # gl_FUNC_MEMMEM_SIMPLE
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76
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77 dnl Additionally, check that memmem has linear performance characteristics
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78 AC_DEFUN([gl_FUNC_MEMMEM],
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79 [
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80 AC_REQUIRE([gl_FUNC_MEMMEM_SIMPLE])
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81 if test $HAVE_DECL_MEMMEM = 1 && test $REPLACE_MEMMEM = 0; then
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82 AC_CACHE_CHECK([whether memmem works in linear time],
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83 [gl_cv_func_memmem_works_fast],
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84 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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85 #include <signal.h> /* for signal */
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86 #include <string.h> /* for memmem */
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87 #include <stdlib.h> /* for malloc */
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88 #include <unistd.h> /* for alarm */
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89 static void quit (int sig) { exit (sig + 128); }
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90 ]], [[
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91 int result = 0;
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92 size_t m = 1000000;
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93 char *haystack = (char *) malloc (2 * m + 1);
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94 char *needle = (char *) malloc (m + 1);
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95 /* Failure to compile this test due to missing alarm is okay,
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96 since all such platforms (mingw) also lack memmem. */
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97 signal (SIGALRM, quit);
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98 alarm (5);
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99 /* Check for quadratic performance. */
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100 if (haystack && needle)
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101 {
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102 memset (haystack, 'A', 2 * m);
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103 haystack[2 * m] = 'B';
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104 memset (needle, 'A', m);
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105 needle[m] = 'B';
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106 if (!memmem (haystack, 2 * m + 1, needle, m + 1))
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107 result |= 1;
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108 }
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109 return result;
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110 ]])],
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111 [gl_cv_func_memmem_works_fast=yes], [gl_cv_func_memmem_works_fast=no],
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112 [dnl Only glibc >= 2.9 and cygwin > 1.7.0 are known to have a
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113 dnl memmem that works in linear time.
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114 AC_EGREP_CPP([Lucky user],
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115 [
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116 #include <features.h>
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117 #ifdef __GNU_LIBRARY__
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118 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)) \
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119 && !defined __UCLIBC__
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120 Lucky user
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121 #endif
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122 #endif
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123 #ifdef __CYGWIN__
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124 #include <cygwin/version.h>
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125 #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 0)
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126 Lucky user
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127 #endif
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128 #endif
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129 ],
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130 [gl_cv_func_memmem_works_fast=yes],
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131 [gl_cv_func_memmem_works_fast="guessing no"])
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132 ])
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133 ])
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134 if test "$gl_cv_func_memmem_works_fast" != yes; then
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135 REPLACE_MEMMEM=1
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136 AC_LIBOBJ([memmem])
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137 fi
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138 fi
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139 ]) # gl_FUNC_MEMMEM
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140
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141 # Prerequisites of lib/memmem.c.
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142 AC_DEFUN([gl_PREREQ_MEMMEM], [:])