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annotate m4/getaddrinfo.m4 @ 9600:99268e709d31

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Avoid quadratic strstr implementations. * lib/strstr.c: New file. * m4/strstr.m4: Likewise. * modules/strstr: Likewise. * modules/strstr-tests: Likewise. * tests/test-strstr.c: Likewise. * lib/string.in.h (rpl_strstr): Declare. (memmem) [GNULIB_POSIXCHECK]: Document speed issue. * m4/string_h.m4 (gl_HEADER_STRING_H_DEFAULTS): Support strstr. * modules/string (Makefile.am): Likewise. * MODULES.html.sh (string handling): Mention new module. * doc/functions/strstr.texi (strstr): Document the bug. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Thu, 10 Jan 2008 07:38:11 -0700
parents 637caf8d483d
children 28050ad34088
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # getaddrinfo.m4 serial 15
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2 dnl Copyright (C) 2004, 2005, 2006, 2007 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 AC_DEFUN([gl_GETADDRINFO],
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8 [
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9 AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
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10 AC_MSG_NOTICE([checking how to do getaddrinfo, freeaddrinfo and getnameinfo])
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11
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12 AC_CHECK_HEADERS_ONCE(netdb.h)
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13
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14 AC_SEARCH_LIBS(getaddrinfo, [nsl socket])
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15 AC_CACHE_CHECK([for getaddrinfo], [gl_cv_func_getaddrinfo], [
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16 AC_TRY_LINK([
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17 #include <sys/types.h>
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18 #ifdef HAVE_SYS_SOCKET_H
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19 #include <sys/socket.h>
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20 #endif
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21 #ifdef HAVE_NETDB_H
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22 #include <netdb.h>
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23 #endif
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24 #include <stddef.h>
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25 ], [getaddrinfo("", "", NULL, NULL);],
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26 [gl_cv_func_getaddrinfo=yes],
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27 [gl_cv_func_getaddrinfo=no])])
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28 if test $gl_cv_func_getaddrinfo = no; then
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29 AC_CACHE_CHECK(for getaddrinfo in ws2tcpip.h and -lws2_32,
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30 gl_cv_w32_getaddrinfo, [
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31 gl_cv_w32_getaddrinfo=no
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32 am_save_LIBS="$LIBS"
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33 LIBS="$LIBS -lws2_32"
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34 AC_TRY_LINK([
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35 #ifdef HAVE_WS2TCPIP_H
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36 #include <ws2tcpip.h>
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37 #endif
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38 #include <stddef.h>
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39 ], [getaddrinfo(NULL, NULL, NULL, NULL);], gl_cv_w32_getaddrinfo=yes)
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40 LIBS="$am_save_LIBS"])
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41 if test "$gl_cv_w32_getaddrinfo" = "yes"; then
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42 LIBS="$LIBS -lws2_32"
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43 else
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44 AC_LIBOBJ(getaddrinfo)
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45 fi
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46 fi
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47
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48 # We can't use AC_REPLACE_FUNCS here because gai_strerror may be an
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49 # inline function declared in ws2tcpip.h, so we need to get that
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50 # header included somehow.
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51 AC_CACHE_CHECK([for gai_strerror (possibly via ws2tcpip.h)],
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52 gl_cv_func_gai_strerror, [
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53 AC_TRY_LINK([
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54 #include <sys/types.h>
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55 #ifdef HAVE_SYS_SOCKET_H
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56 #include <sys/socket.h>
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57 #endif
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58 #ifdef HAVE_NETDB_H
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59 #include <netdb.h>
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60 #endif
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61 #ifdef HAVE_WS2TCPIP_H
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62 #include <ws2tcpip.h>
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63 #endif
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64 #include <stddef.h>
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65 ], [gai_strerror (NULL);],
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66 [gl_cv_func_gai_strerror=yes],
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67 [gl_cv_func_gai_strerror=no])])
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68 if test $gl_cv_func_gai_strerror = no; then
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69 AC_LIBOBJ(gai_strerror)
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70 fi
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71
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72 gl_PREREQ_GETADDRINFO
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73 ])
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74
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75 # Prerequisites of lib/getaddrinfo.h and lib/getaddrinfo.c.
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76 AC_DEFUN([gl_PREREQ_GETADDRINFO], [
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77 AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
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78 AC_SEARCH_LIBS(gethostbyname, [inet nsl])
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79 AC_SEARCH_LIBS(getservbyname, [inet nsl socket xnet])
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80 AC_CHECK_FUNCS(gethostbyname,, [
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81 AC_CACHE_CHECK(for gethostbyname in winsock2.h and -lws2_32,
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82 gl_cv_w32_gethostbyname, [
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83 gl_cv_w32_gethostbyname=no
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84 am_save_LIBS="$LIBS"
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85 LIBS="$LIBS -lws2_32"
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86 AC_TRY_LINK([
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87 #ifdef HAVE_WINSOCK2_H
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88 #include <winsock2.h>
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89 #endif
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90 #include <stddef.h>
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91 ], [gethostbyname(NULL);], gl_cv_w32_gethostbyname=yes)
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92 LIBS="$am_save_LIBS"])
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93 if test "$gl_cv_w32_gethostbyname" = "yes"; then
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94 LIBS="$LIBS -lws2_32"
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95 fi
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96 ])
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97 AC_REQUIRE([AC_C_RESTRICT])
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98 AC_REQUIRE([gl_SOCKET_FAMILIES])
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99 AC_REQUIRE([gl_HEADER_SYS_SOCKET])
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100 AC_REQUIRE([AC_C_INLINE])
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101 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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102 AC_CHECK_HEADERS_ONCE(netinet/in.h netdb.h)
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103 AC_CHECK_DECLS([getaddrinfo, freeaddrinfo, gai_strerror, getnameinfo],,,[
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104 /* sys/types.h is not needed according to POSIX, but the
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105 sys/socket.h in i386-unknown-freebsd4.10 and
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106 powerpc-apple-darwin5.5 required it. */
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107 #include <sys/types.h>
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108 #ifdef HAVE_SYS_SOCKET_H
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109 #include <sys/socket.h>
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110 #endif
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111 #ifdef HAVE_NETDB_H
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112 #include <netdb.h>
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113 #endif
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114 #ifdef HAVE_WS2TCPIP_H
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115 #include <ws2tcpip.h>
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116 #endif
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117 ])
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118 AC_CHECK_TYPES([struct addrinfo],,,[
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119 #include <sys/types.h>
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120 #ifdef HAVE_SYS_SOCKET_H
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121 #include <sys/socket.h>
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122 #endif
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123 #ifdef HAVE_NETDB_H
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124 #include <netdb.h>
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125 #endif
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126 #ifdef HAVE_WS2TCPIP_H
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127 #include <ws2tcpip.h>
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128 #endif
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129 ])
81f384f9b845 2005-10-01 Simon Josefsson <jas@extundo.com>
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parents: 6316
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130 ])