1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by David MacKenzie <djm@ai.mit.edu>
19 Modified by Akim Demaille <demaille@inf.enst.fr> */
34 # define _(Text) gettext (Text)
41 /* When reporting a failing argument, make sure to show invisible
42 characters hidden using the quoting style
43 ARGMATCH_QUOTING_STYLE. literal_quoting_style is not good. */
45 #ifndef ARGMATCH_QUOTING_STYLE
46 # define ARGMATCH_QUOTING_STYLE c_quoting_style
49 extern char *program_name;
51 /* If ARG is an unambiguous match for an element of the
52 null-terminated array ARGLIST, return the index in ARGLIST
53 of the matched element, else -1 if it does not match any element
54 or -2 if it is ambiguous (is a prefix of more than one element).
55 If SENSITIVE, comparison is case sensitive.
57 If VALLIST is none null, use it to resolve ambiguities limited to
61 "y" is a valid argument, for `0', and "n" for `1'. */
64 __argmatch_internal (const char *arg, const char *const *arglist,
65 const char *vallist, size_t valsize,
68 int i; /* Temporary index in ARGLIST. */
69 size_t arglen; /* Length of ARG. */
70 int matchind = -1; /* Index of first nonexact match. */
71 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
73 arglen = strlen (arg);
75 /* Test all elements for either exact match or abbreviated matches. */
76 for (i = 0; arglist[i]; i++)
79 ? !strncmp (arglist[i], arg, arglen)
80 : !strncasecmp (arglist[i], arg, arglen))
82 if (strlen (arglist[i]) == arglen)
83 /* Exact match found. */
85 else if (matchind == -1)
86 /* First nonexact match found. */
90 /* Second nonexact match found. */
92 || memcmp (vallist + valsize * matchind,
93 vallist + valsize * i, valsize))
95 /* There is a real ambiguity, or we could not
108 /* argmatch - case sensitive version */
110 argmatch (const char *arg, const char *const *arglist,
111 const char *vallist, size_t valsize)
113 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
116 /* argcasematch - case insensitive version */
118 argcasematch (const char *arg, const char *const *arglist,
119 const char *vallist, size_t valsize)
121 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
124 /* Error reporting for argmatch.
125 KIND is a description of the type of entity that was being matched.
126 VALUE is the invalid value that was given.
127 PROBLEM is the return value from argmatch. */
130 argmatch_invalid (const char *kind, const char *value, int problem)
132 enum quoting_style saved_quoting_style;
136 /* Make sure to have a good quoting style to report errors.
137 literal is insane here. */
138 saved_quoting_style = get_quoting_style (NULL);
139 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
141 /* There is an error */
142 quoted_arg = quotearg (value);
144 /* Skip over the first quote character, and overwrite the last one. */
146 quoted_arg[strlen (quoted_arg) - 1] = '\0';
148 format = (problem == -1
149 ? _("%s: invalid argument `%s' for `%s'\n")
150 : _("%s: ambiguous argument `%s' for `%s'\n"));
152 fprintf (stderr, format, program_name, quoted_arg, kind);
154 set_quoting_style (NULL, saved_quoting_style);
157 /* List the valid arguments for argmatch.
158 ARGLIST is the same as in argmatch.
159 VALLIST is a pointer to an array of values.
160 VALSIZE is the size of the elements of VALLIST */
162 argmatch_valid (const char *const *arglist,
163 const char *vallist, size_t valsize)
166 const char *last_val = NULL;
168 /* We try to put synonyms on the same line. The assumption is that
169 synonyms follow each other */
170 fprintf (stderr, _("Valid arguments are:"));
171 for (i = 0; arglist[i]; i++)
173 || memcmp (last_val, vallist + valsize * i, valsize))
175 fprintf (stderr, "\n - `%s'", arglist[i]);
176 last_val = vallist + valsize * i;
180 fprintf (stderr, ", `%s'", arglist[i]);
185 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
186 return the first corresponding argument in ARGLIST */
188 argmatch_to_argument (const char *value,
189 const char *const *arglist,
190 const char *vallist, size_t valsize)
194 for (i = 0; arglist[i]; i++)
195 if (!memcmp (value, vallist + valsize * i, valsize))
202 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
205 extern const char *getenv ();
207 /* When to make backup files. */
210 /* Never make backups. */
213 /* Make simple backups of every file. */
216 /* Make numbered backups of files that already have numbered backups,
217 and simple backups of the others. */
220 /* Make numbered backups of every file. */
224 /* Two tables describing arguments (keys) and their corresponding
226 static const char *const backup_args[] =
235 static const enum backup_type backup_vals[] =
239 numbered_existing, numbered_existing,
244 main (int argc, const char *const *argv)
247 enum backup_type backup_type = none;
249 program_name = (char *) argv[0];
253 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
257 if ((cp = getenv ("VERSION_CONTROL")))
258 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
259 backup_args, backup_vals);
262 backup_type = XARGCASEMATCH (program_name, argv[1],
263 backup_args, backup_vals);
265 printf ("The version control is `%s'\n",
266 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));