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annotate lib/argmatch.c @ 1632:f6217175922c

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(ARGMATCH_QUOTING_STYLE): Change from c_quoting_style to escape_quoting_style. (argmatch_invalid): Now that the quoted quantity is no longer double quoted, remove the code that removed leading and trailing double quotes.
author Jim Meyering <jim@meyering.net>
date Mon, 11 Jan 1999 03:10:19 +0000
parents 22cb405d7c5a
children 47cbac954273
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 /* If ARG is an unambiguous match for an element of the
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52 null-terminated array ARGLIST, return the index in ARGLIST
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53 of the matched element, else -1 if it does not match any element
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54 or -2 if it is ambiguous (is a prefix of more than one element).
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55 If SENSITIVE, comparison is case sensitive.
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56
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57 If VALLIST is none null, use it to resolve ambiguities limited to
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58 synonyms, i.e., for
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59 "yes", "yop" -> 0
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60 "no", "nope" -> 1
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61 "y" is a valid argument, for `0', and "n" for `1'. */
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62
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63 static int
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64 __argmatch_internal (const char *arg, const char *const *arglist,
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65 const char *vallist, size_t valsize,
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66 int case_sensitive)
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67 {
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68 int i; /* Temporary index in ARGLIST. */
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69 size_t arglen; /* Length of ARG. */
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70 int matchind = -1; /* Index of first nonexact match. */
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71 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
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72
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73 arglen = strlen (arg);
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74
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75 /* Test all elements for either exact match or abbreviated matches. */
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76 for (i = 0; arglist[i]; i++)
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77 {
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78 if (case_sensitive
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79 ? !strncmp (arglist[i], arg, arglen)
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80 : !strncasecmp (arglist[i], arg, arglen))
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81 {
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82 if (strlen (arglist[i]) == arglen)
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83 /* Exact match found. */
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84 return i;
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85 else if (matchind == -1)
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86 /* First nonexact match found. */
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87 matchind = i;
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88 else
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89 {
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90 /* Second nonexact match found. */
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91 if (vallist == NULL
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92 || memcmp (vallist + valsize * matchind,
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93 vallist + valsize * i, valsize))
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94 {
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95 /* There is a real ambiguity, or we could not
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96 disambiguate. */
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97 ambiguous = 1;
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98 }
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99 }
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100 }
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101 }
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102 if (ambiguous)
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103 return -2;
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104 else
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105 return matchind;
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106 }
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107
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108 /* argmatch - case sensitive version */
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109 int
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110 argmatch (const char *arg, const char *const *arglist,
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111 const char *vallist, size_t valsize)
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112 {
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113 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
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114 }
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115
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116 /* argcasematch - case insensitive version */
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117 int
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118 argcasematch (const char *arg, const char *const *arglist,
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119 const char *vallist, size_t valsize)
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120 {
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121 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
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122 }
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123
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124 /* Error reporting for argmatch.
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125 KIND is a description of the type of entity that was being matched.
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126 VALUE is the invalid value that was given.
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127 PROBLEM is the return value from argmatch. */
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128
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129 void
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130 argmatch_invalid (const char *kind, const char *value, int problem)
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131 {
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132 enum quoting_style saved_quoting_style;
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133 char const *format;
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134
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135 /* Make sure to have a good quoting style to report errors.
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136 literal is insane here. */
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137 saved_quoting_style = get_quoting_style (NULL);
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138 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
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139
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140 format = (problem == -1
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141 ? _("%s: invalid argument `%s' for `%s'\n")
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142 : _("%s: ambiguous argument `%s' for `%s'\n"));
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143
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144 fprintf (stderr, format, program_name, quotearg (value), kind);
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145
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146 set_quoting_style (NULL, saved_quoting_style);
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147 }
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148
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149 /* List the valid arguments for argmatch.
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150 ARGLIST is the same as in argmatch.
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151 VALLIST is a pointer to an array of values.
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152 VALSIZE is the size of the elements of VALLIST */
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153 void
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154 argmatch_valid (const char *const *arglist,
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155 const char *vallist, size_t valsize)
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156 {
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157 int i;
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158 const char *last_val = NULL;
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159
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160 /* We try to put synonyms on the same line. The assumption is that
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161 synonyms follow each other */
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162 fprintf (stderr, _("Valid arguments are:"));
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163 for (i = 0; arglist[i]; i++)
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164 if ((i == 0)
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165 || memcmp (last_val, vallist + valsize * i, valsize))
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166 {
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167 fprintf (stderr, "\n - `%s'", arglist[i]);
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168 last_val = vallist + valsize * i;
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169 }
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170 else
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171 {
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172 fprintf (stderr, ", `%s'", arglist[i]);
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173 }
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174 putc ('\n', stderr);
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175 }
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176
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177 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
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178 return the first corresponding argument in ARGLIST */
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179 const char *
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180 argmatch_to_argument (const char *value,
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181 const char *const *arglist,
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182 const char *vallist, size_t valsize)
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183 {
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184 int i;
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185
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186 for (i = 0; arglist[i]; i++)
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187 if (!memcmp (value, vallist + valsize * i, valsize))
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188 return arglist[i];
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189 return NULL;
5
41c9d08b09d7 Initial revision
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190 }
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191
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192 #ifdef TEST
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193 /*
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194 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
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195 */
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196 char *rogram_name;
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197 extern const char *getenv ();
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198
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199 /* When to make backup files. */
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200 enum backup_type
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201 {
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202 /* Never make backups. */
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203 none,
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204
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205 /* Make simple backups of every file. */
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206 simple,
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207
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208 /* Make numbered backups of files that already have numbered backups,
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209 and simple backups of the others. */
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210 numbered_existing,
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211
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212 /* Make numbered backups of every file. */
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213 numbered
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214 };
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215
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216 /* Two tables describing arguments (keys) and their corresponding
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217 values */
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218 static const char *const backup_args[] =
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219 {
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220 "no", "none", "off",
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221 "simple", "never",
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222 "existing", "nil",
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223 "numbered", "t",
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224 0
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225 };
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226
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227 static const enum backup_type backup_vals[] =
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228 {
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229 none, none, none,
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230 simple, simple,
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231 numbered_existing, numbered_existing,
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232 numbered, numbered
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233 };
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234
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235 int
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236 main (int argc, const char *const *argv)
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237 {
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238 const char *cp;
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239 enum backup_type backup_type = none;
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240
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diff changeset
241 program_name = (char *) argv[0];
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242
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diff changeset
243 if (argc > 2)
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244 {
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245 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
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246 exit (1);
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diff changeset
247 }
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248
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249 if ((cp = getenv ("VERSION_CONTROL")))
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250 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
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diff changeset
251 backup_args, backup_vals);
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diff changeset
252
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diff changeset
253 if (argc == 2)
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diff changeset
254 backup_type = XARGCASEMATCH (program_name, argv[1],
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diff changeset
255 backup_args, backup_vals);
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diff changeset
256
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diff changeset
257 printf ("The version control is `%s'\n",
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diff changeset
258 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));
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259
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260 return 0;
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diff changeset
261 }
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diff changeset
262 #endif