1dnl Copyright 2010 The Kyua Authors. 2dnl All rights reserved. 3dnl 4dnl Redistribution and use in source and binary forms, with or without 5dnl modification, are permitted provided that the following conditions are 6dnl met: 7dnl 8dnl * Redistributions of source code must retain the above copyright 9dnl notice, this list of conditions and the following disclaimer. 10dnl * Redistributions in binary form must reproduce the above copyright 11dnl notice, this list of conditions and the following disclaimer in the 12dnl documentation and/or other materials provided with the distribution. 13dnl * Neither the name of Google Inc. nor the names of its contributors 14dnl may be used to endorse or promote products derived from this software 15dnl without specific prior written permission. 16dnl 17dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 30dnl Checks if getopt(3) supports a + sign to enforce POSIX correctness. 31dnl 32dnl In the GNU implementation of getopt(3), we need to pass a + sign at 33dnl the beginning of the options string to request POSIX behavior. 34dnl 35dnl Defines HAVE_GETOPT_GNU if a + sign is supported. 36AC_DEFUN([_KYUA_GETOPT_GNU], [ 37 AC_CACHE_CHECK( 38 [whether getopt allows a + sign for POSIX behavior optreset], 39 [kyua_cv_getopt_gnu], [ 40 AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdlib.h> 41#include <string.h> 42#include <unistd.h>], [ 43 int argc = 4; 44 char* argv@<:@5@:>@ = { 45 strdup("conftest"), 46 strdup("-+"), 47 strdup("-a"), 48 strdup("bar"), 49 NULL 50 }; 51 int ch; 52 int seen_a = 0, seen_plus = 0; 53 54 while ((ch = getopt(argc, argv, "+a:")) != -1) { 55 switch (ch) { 56 case 'a': 57 seen_a = 1; 58 break; 59 60 case '+': 61 seen_plus = 1; 62 break; 63 64 case '?': 65 default: 66 ; 67 } 68 } 69 70 return (seen_a && !seen_plus) ? EXIT_SUCCESS : EXIT_FAILURE; 71])], 72 [kyua_cv_getopt_gnu=yes], 73 [kyua_cv_getopt_gnu=no]) 74 ]) 75 if test "${kyua_cv_getopt_gnu}" = yes; then 76 AC_DEFINE([HAVE_GETOPT_GNU], [1], 77 [Define to 1 if getopt allows a + sign for POSIX behavior]) 78 fi 79]) 80 81dnl Checks if optreset exists to reset the processing of getopt(3) options. 82dnl 83dnl getopt(3) has an optreset global variable to reset internal state 84dnl before calling getopt(3) again. However, optreset is not standard and 85dnl is only present in the BSD versions of getopt(3). 86dnl 87dnl Defines HAVE_GETOPT_WITH_OPTRESET if optreset exists. 88AC_DEFUN([_KYUA_GETOPT_WITH_OPTRESET], [ 89 AC_CACHE_CHECK( 90 [whether getopt has optreset], 91 [kyua_cv_getopt_optreset], [ 92 AC_COMPILE_IFELSE([AC_LANG_SOURCE([ 93#include <stdlib.h> 94#include <unistd.h> 95 96int 97main(void) 98{ 99 optreset = 1; 100 return EXIT_SUCCESS; 101} 102])], 103 [kyua_cv_getopt_optreset=yes], 104 [kyua_cv_getopt_optreset=no]) 105 ]) 106 if test "${kyua_cv_getopt_optreset}" = yes; then 107 AC_DEFINE([HAVE_GETOPT_WITH_OPTRESET], [1], 108 [Define to 1 if getopt has optreset]) 109 fi 110]) 111 112 113dnl Checks the value to pass to optind to reset getopt(3) processing. 114dnl 115dnl The standard value to pass to optind to reset the processing of command 116dnl lines with getopt(3) is 1. However, the GNU extensions to getopt_long(3) 117dnl are not properly reset unless optind is set to 0, causing crashes later 118dnl on and incorrect option processing behavior. 119dnl 120dnl Sets the GETOPT_OPTIND_RESET_VALUE macro to the integer value that has to 121dnl be passed to optind to reset option processing. 122AC_DEFUN([_KYUA_GETOPT_OPTIND_RESET_VALUE], [ 123 AC_CACHE_CHECK( 124 [for the optind value to reset getopt processing], 125 [kyua_cv_getopt_optind_reset_value], [ 126 AC_RUN_IFELSE([AC_LANG_SOURCE([ 127#include <stdlib.h> 128#include <string.h> 129#include <unistd.h> 130 131static void 132first_pass(void) 133{ 134 int argc, ch, flag; 135 char* argv@<:@5@:>@; 136 137 argc = 4; 138 argv@<:@0@:>@ = strdup("progname"); 139 argv@<:@1@:>@ = strdup("-a"); 140 argv@<:@2@:>@ = strdup("foo"); 141 argv@<:@3@:>@ = strdup("bar"); 142 argv@<:@4@:>@ = NULL; 143 144 flag = 0; 145 while ((ch = getopt(argc, argv, "+:a")) != -1) { 146 switch (ch) { 147 case 'a': 148 flag = 1; 149 break; 150 default: 151 break; 152 } 153 } 154 if (!flag) { 155 exit(EXIT_FAILURE); 156 } 157} 158 159static void 160second_pass(void) 161{ 162 int argc, ch, flag; 163 char* argv@<:@5@:>@; 164 165 argc = 4; 166 argv@<:@0@:>@ = strdup("progname"); 167 argv@<:@1@:>@ = strdup("-b"); 168 argv@<:@2@:>@ = strdup("foo"); 169 argv@<:@3@:>@ = strdup("bar"); 170 argv@<:@4@:>@ = NULL; 171 172 flag = 0; 173 while ((ch = getopt(argc, argv, "b")) != -1) { 174 switch (ch) { 175 case 'b': 176 flag = 1; 177 break; 178 default: 179 break; 180 } 181 } 182 if (!flag) { 183 exit(EXIT_FAILURE); 184 } 185} 186 187int 188main(void) 189{ 190 /* We do two passes in two different functions to prevent the reuse of 191 * variables and, specially, to force the use of two different argument 192 * vectors. */ 193 first_pass(); 194 optind = 0; 195 second_pass(); 196 return EXIT_SUCCESS; 197} 198])], 199 [kyua_cv_getopt_optind_reset_value=0], 200 [kyua_cv_getopt_optind_reset_value=1]) 201 ]) 202 AC_DEFINE_UNQUOTED([GETOPT_OPTIND_RESET_VALUE], 203 [${kyua_cv_getopt_optind_reset_value}], 204 [Define to the optind value to reset getopt processing]) 205]) 206 207 208dnl Wrapper macro to detect all getopt(3) necessary features. 209AC_DEFUN([KYUA_GETOPT], [ 210 _KYUA_GETOPT_GNU 211 _KYUA_GETOPT_OPTIND_RESET_VALUE 212 _KYUA_GETOPT_WITH_OPTRESET 213]) 214