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annotate lib/argmatch.c @ 1647:af020f6709a9

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s/argmatch_exit_failure/argmatch_die/
author Jim Meyering <jim@meyering.net>
date Sat, 16 Jan 1999 15:21:52 +0000
parents 0f8f202484fb
children d8cb69b80232
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rev   line source
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1 /* argmatch.c -- find a match for a string in an array
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2 Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 /* Written by David MacKenzie <djm@ai.mit.edu>
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19 Modified by Akim Demaille <demaille@inf.enst.fr> */
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20
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21 #include "argmatch.h"
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22
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23 #include <stdio.h>
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24 #ifdef STDC_HEADERS
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25 # include <string.h>
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26 #endif
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27
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28 #if HAVE_LOCALE_H
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29 # include <locale.h>
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30 #endif
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31
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32 #if ENABLE_NLS
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33 # include <libintl.h>
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34 # define _(Text) gettext (Text)
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35 #else
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36 # define _(Text) Text
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37 #endif
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38
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39 #include "quotearg.h"
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40
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41 /* When reporting a failing argument, make sure to show invisible
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42 characters hidden using the quoting style
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43 ARGMATCH_QUOTING_STYLE. literal_quoting_style is not good. */
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44
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45 #ifndef ARGMATCH_QUOTING_STYLE
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46 # define ARGMATCH_QUOTING_STYLE escape_quoting_style
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47 #endif
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48
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49 extern char *program_name;
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50
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51 /* The following test is to work around the gross typo in
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52 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
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53 is defined to 0, not 1. */
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54 #if !EXIT_FAILURE
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55 # undef EXIT_FAILURE
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56 # define EXIT_FAILURE 1
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57 #endif
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58
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59 /* Non failing version of argmatch call this function after failing. */
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60 #ifndef ARGMATCH_DIE
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61 # define ARGMATCH_DIE exit (EXIT_FAILURE)
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62 #endif
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63
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64 static void
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65 __argmatch_die (void)
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66 {
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67 ARGMATCH_DIE;
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68 }
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69
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70 argmatch_exit_fn argmatch_die = __argmatch_die;
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71
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72 /* If ARG is an unambiguous match for an element of the
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73 null-terminated array ARGLIST, return the index in ARGLIST
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74 of the matched element, else -1 if it does not match any element
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75 or -2 if it is ambiguous (is a prefix of more than one element).
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76 If SENSITIVE, comparison is case sensitive.
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77
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78 If VALLIST is none null, use it to resolve ambiguities limited to
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79 synonyms, i.e., for
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80 "yes", "yop" -> 0
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81 "no", "nope" -> 1
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82 "y" is a valid argument, for `0', and "n" for `1'. */
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83
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84 static int
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85 __argmatch_internal (const char *arg, const char *const *arglist,
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86 const char *vallist, size_t valsize,
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87 int case_sensitive)
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88 {
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89 int i; /* Temporary index in ARGLIST. */
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90 size_t arglen; /* Length of ARG. */
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91 int matchind = -1; /* Index of first nonexact match. */
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92 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
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93
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94 arglen = strlen (arg);
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95
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96 /* Test all elements for either exact match or abbreviated matches. */
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97 for (i = 0; arglist[i]; i++)
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98 {
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99 if (case_sensitive
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100 ? !strncmp (arglist[i], arg, arglen)
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101 : !strncasecmp (arglist[i], arg, arglen))
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102 {
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103 if (strlen (arglist[i]) == arglen)
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104 /* Exact match found. */
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105 return i;
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106 else if (matchind == -1)
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107 /* First nonexact match found. */
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108 matchind = i;
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109 else
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110 {
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111 /* Second nonexact match found. */
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112 if (vallist == NULL
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113 || memcmp (vallist + valsize * matchind,
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114 vallist + valsize * i, valsize))
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115 {
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116 /* There is a real ambiguity, or we could not
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117 disambiguate. */
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118 ambiguous = 1;
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119 }
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120 }
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121 }
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122 }
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123 if (ambiguous)
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124 return -2;
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125 else
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126 return matchind;
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127 }
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128
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129 /* argmatch - case sensitive version */
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130 int
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131 argmatch (const char *arg, const char *const *arglist,
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132 const char *vallist, size_t valsize)
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133 {
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134 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
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135 }
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136
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137 /* argcasematch - case insensitive version */
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138 int
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139 argcasematch (const char *arg, const char *const *arglist,
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140 const char *vallist, size_t valsize)
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141 {
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142 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
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143 }
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144
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145 /* Error reporting for argmatch.
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146 CONTEXT is a description of the type of entity that was being matched.
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147 VALUE is the invalid value that was given.
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148 PROBLEM is the return value from argmatch. */
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149
41c9d08b09d7 Initial revision
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150 void
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diff changeset
151 argmatch_invalid (const char *context, const char *value, int problem)
1587
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152 {
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diff changeset
153 enum quoting_style saved_quoting_style;
1619
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diff changeset
154 char const *format;
1587
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155
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156 /* Make sure to have a good quoting style to report errors.
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diff changeset
157 literal is insane here. */
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158 saved_quoting_style = get_quoting_style (NULL);
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diff changeset
159 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
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diff changeset
160
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161 format = (problem == -1
22cb405d7c5a (argmatch_invalid): Remove double quotes from the
Jim Meyering <jim@meyering.net>
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162 ? _("%s: invalid argument `%s' for `%s'\n")
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163 : _("%s: ambiguous argument `%s' for `%s'\n"));
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164
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165 fprintf (stderr, format, program_name, quotearg (value), context);
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166
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diff changeset
167 set_quoting_style (NULL, saved_quoting_style);
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168 }
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169
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170 /* List the valid arguments for argmatch.
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171 ARGLIST is the same as in argmatch.
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172 VALLIST is a pointer to an array of values.
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173 VALSIZE is the size of the elements of VALLIST */
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174 void
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175 argmatch_valid (const char *const *arglist,
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176 const char *vallist, size_t valsize)
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177 {
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178 int i;
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179 const char *last_val = NULL;
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180
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181 /* We try to put synonyms on the same line. The assumption is that
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182 synonyms follow each other */
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183 fprintf (stderr, _("Valid arguments are:"));
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184 for (i = 0; arglist[i]; i++)
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185 if ((i == 0)
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186 || memcmp (last_val, vallist + valsize * i, valsize))
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187 {
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188 fprintf (stderr, "\n - `%s'", arglist[i]);
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189 last_val = vallist + valsize * i;
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190 }
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191 else
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192 {
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193 fprintf (stderr, ", `%s'", arglist[i]);
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194 }
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195 putc ('\n', stderr);
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196 }
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197
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198 /* Never failing versions of the previous functions.
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199
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200 CONTEXT is the context for which argmatch is called (e.g.,
47cbac954273 (ARGMATCH_DIE): Provide default.
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201 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
47cbac954273 (ARGMATCH_DIE): Provide default.
Jim Meyering <jim@meyering.net>
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202 calls the (supposed never to return) function EXIT_FN. */
47cbac954273 (ARGMATCH_DIE): Provide default.
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203
47cbac954273 (ARGMATCH_DIE): Provide default.
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204 int
47cbac954273 (ARGMATCH_DIE): Provide default.
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205 __xargmatch_internal (const char *context,
47cbac954273 (ARGMATCH_DIE): Provide default.
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206 const char *arg, const char *const *arglist,
47cbac954273 (ARGMATCH_DIE): Provide default.
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207 const char *vallist, size_t valsize,
47cbac954273 (ARGMATCH_DIE): Provide default.
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208 int case_sensitive,
47cbac954273 (ARGMATCH_DIE): Provide default.
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209 argmatch_exit_fn exit_fn)
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210 {
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211 int res = __argmatch_internal (arg, arglist,
47cbac954273 (ARGMATCH_DIE): Provide default.
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212 vallist, valsize,
47cbac954273 (ARGMATCH_DIE): Provide default.
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213 case_sensitive);
47cbac954273 (ARGMATCH_DIE): Provide default.
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diff changeset
214 if (res >= 0)
47cbac954273 (ARGMATCH_DIE): Provide default.
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215 /* Success. */
47cbac954273 (ARGMATCH_DIE): Provide default.
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216 return res;
47cbac954273 (ARGMATCH_DIE): Provide default.
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217
47cbac954273 (ARGMATCH_DIE): Provide default.
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218 /* We failed. Explain why. */
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219 argmatch_invalid (context, arg, res);
47cbac954273 (ARGMATCH_DIE): Provide default.
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220 argmatch_valid (arglist, vallist, valsize);
47cbac954273 (ARGMATCH_DIE): Provide default.
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221 (*exit_fn) ();
47cbac954273 (ARGMATCH_DIE): Provide default.
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diff changeset
222
47cbac954273 (ARGMATCH_DIE): Provide default.
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223 return -1; /* To please the compilers. */
47cbac954273 (ARGMATCH_DIE): Provide default.
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224 }
47cbac954273 (ARGMATCH_DIE): Provide default.
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225
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226 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
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227 return the first corresponding argument in ARGLIST */
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228 const char *
1611
124c0cb70d04 (__xargmatch_internal): Remove now-unused function.
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diff changeset
229 argmatch_to_argument (const char *value,
1587
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diff changeset
230 const char *const *arglist,
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
231 const char *vallist, size_t valsize)
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232 {
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233 int i;
1588
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234
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diff changeset
235 for (i = 0; arglist[i]; i++)
1587
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diff changeset
236 if (!memcmp (value, vallist + valsize * i, valsize))
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diff changeset
237 return arglist[i];
1587
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238 return NULL;
5
41c9d08b09d7 Initial revision
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diff changeset
239 }
1587
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240
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
241 #ifdef TEST
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
242 /*
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
243 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
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244 */
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245 char *program_name;
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diff changeset
246 extern const char *getenv ();
1587
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247
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
248 /* When to make backup files. */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
249 enum backup_type
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diff changeset
250 {
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
251 /* Never make backups. */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
252 none,
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
253
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
254 /* Make simple backups of every file. */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
255 simple,
3f067a341196 lots of changes from Akim Demaille.
Jim Meyering <jim@meyering.net>
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diff changeset
256
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
257 /* Make numbered backups of files that already have numbered backups,
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
258 and simple backups of the others. */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
259 numbered_existing,
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
260
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
261 /* Make numbered backups of every file. */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
262 numbered
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
263 };
3f067a341196 lots of changes from Akim Demaille.
Jim Meyering <jim@meyering.net>
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diff changeset
264
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
265 /* Two tables describing arguments (keys) and their corresponding
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
266 values */
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
267 static const char *const backup_args[] =
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
268 {
1588
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diff changeset
269 "no", "none", "off",
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diff changeset
270 "simple", "never",
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diff changeset
271 "existing", "nil",
a6a81f3170d0 remove trailing blanks
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diff changeset
272 "numbered", "t",
1587
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diff changeset
273 0
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
274 };
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
275
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
276 static const enum backup_type backup_vals[] =
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diff changeset
277 {
1588
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diff changeset
278 none, none, none,
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diff changeset
279 simple, simple,
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diff changeset
280 numbered_existing, numbered_existing,
1587
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diff changeset
281 numbered, numbered
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
282 };
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
283
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
284 int
1590
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diff changeset
285 main (int argc, const char *const *argv)
1587
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
286 {
1590
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Jim Meyering <jim@meyering.net>
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diff changeset
287 const char *cp;
1587
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diff changeset
288 enum backup_type backup_type = none;
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diff changeset
289
1590
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diff changeset
290 program_name = (char *) argv[0];
1587
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diff changeset
291
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
292 if (argc > 2)
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
293 {
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
294 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
3f067a341196 lots of changes from Akim Demaille.
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diff changeset
295 exit (1);
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diff changeset
296 }
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297
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298 if ((cp = getenv ("VERSION_CONTROL")))
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299 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
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300 backup_args, backup_vals);
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301
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302 if (argc == 2)
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303 backup_type = XARGCASEMATCH (program_name, argv[1],
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304 backup_args, backup_vals);
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305
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306 printf ("The version control is `%s'\n",
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307 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));
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308
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309 return 0;
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310 }
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311 #endif