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 escape_quoting_style
49 extern char *program_name;
51 /* Non failing version of argmatch call this function after failing. */
53 # define ARGMATCH_DIE exit (2)
62 argmatch_exit_fn argmatch_exit_failure = __argmatch_exit_failure;
64 /* If ARG is an unambiguous match for an element of the
65 null-terminated array ARGLIST, return the index in ARGLIST
66 of the matched element, else -1 if it does not match any element
67 or -2 if it is ambiguous (is a prefix of more than one element).
68 If SENSITIVE, comparison is case sensitive.
70 If VALLIST is none null, use it to resolve ambiguities limited to
74 "y" is a valid argument, for `0', and "n" for `1'. */
77 __argmatch_internal (const char *arg, const char *const *arglist,
78 const char *vallist, size_t valsize,
81 int i; /* Temporary index in ARGLIST. */
82 size_t arglen; /* Length of ARG. */
83 int matchind = -1; /* Index of first nonexact match. */
84 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
86 arglen = strlen (arg);
88 /* Test all elements for either exact match or abbreviated matches. */
89 for (i = 0; arglist[i]; i++)
92 ? !strncmp (arglist[i], arg, arglen)
93 : !strncasecmp (arglist[i], arg, arglen))
95 if (strlen (arglist[i]) == arglen)
96 /* Exact match found. */
98 else if (matchind == -1)
99 /* First nonexact match found. */
103 /* Second nonexact match found. */
105 || memcmp (vallist + valsize * matchind,
106 vallist + valsize * i, valsize))
108 /* There is a real ambiguity, or we could not
121 /* argmatch - case sensitive version */
123 argmatch (const char *arg, const char *const *arglist,
124 const char *vallist, size_t valsize)
126 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
129 /* argcasematch - case insensitive version */
131 argcasematch (const char *arg, const char *const *arglist,
132 const char *vallist, size_t valsize)
134 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
137 /* Error reporting for argmatch.
138 CONTEXT is a description of the type of entity that was being matched.
139 VALUE is the invalid value that was given.
140 PROBLEM is the return value from argmatch. */
143 argmatch_invalid (const char *context, const char *value, int problem)
145 enum quoting_style saved_quoting_style;
148 /* Make sure to have a good quoting style to report errors.
149 literal is insane here. */
150 saved_quoting_style = get_quoting_style (NULL);
151 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
153 format = (problem == -1
154 ? _("%s: invalid argument `%s' for `%s'\n")
155 : _("%s: ambiguous argument `%s' for `%s'\n"));
157 fprintf (stderr, format, program_name, quotearg (value), context);
159 set_quoting_style (NULL, saved_quoting_style);
162 /* List the valid arguments for argmatch.
163 ARGLIST is the same as in argmatch.
164 VALLIST is a pointer to an array of values.
165 VALSIZE is the size of the elements of VALLIST */
167 argmatch_valid (const char *const *arglist,
168 const char *vallist, size_t valsize)
171 const char *last_val = NULL;
173 /* We try to put synonyms on the same line. The assumption is that
174 synonyms follow each other */
175 fprintf (stderr, _("Valid arguments are:"));
176 for (i = 0; arglist[i]; i++)
178 || memcmp (last_val, vallist + valsize * i, valsize))
180 fprintf (stderr, "\n - `%s'", arglist[i]);
181 last_val = vallist + valsize * i;
185 fprintf (stderr, ", `%s'", arglist[i]);
190 /* Never failing versions of the previous functions.
192 CONTEXT is the context for which argmatch is called (e.g.,
193 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
194 calls the (supposed never to return) function EXIT_FN. */
197 __xargmatch_internal (const char *context,
198 const char *arg, const char *const *arglist,
199 const char *vallist, size_t valsize,
201 argmatch_exit_fn exit_fn)
203 int res = __argmatch_internal (arg, arglist,
210 /* We failed. Explain why. */
211 argmatch_invalid (context, arg, res);
212 argmatch_valid (arglist, vallist, valsize);
215 return -1; /* To please the compilers. */
218 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
219 return the first corresponding argument in ARGLIST */
221 argmatch_to_argument (const char *value,
222 const char *const *arglist,
223 const char *vallist, size_t valsize)
227 for (i = 0; arglist[i]; i++)
228 if (!memcmp (value, vallist + valsize * i, valsize))
235 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
238 extern const char *getenv ();
240 /* When to make backup files. */
243 /* Never make backups. */
246 /* Make simple backups of every file. */
249 /* Make numbered backups of files that already have numbered backups,
250 and simple backups of the others. */
253 /* Make numbered backups of every file. */
257 /* Two tables describing arguments (keys) and their corresponding
259 static const char *const backup_args[] =
268 static const enum backup_type backup_vals[] =
272 numbered_existing, numbered_existing,
277 main (int argc, const char *const *argv)
280 enum backup_type backup_type = none;
282 program_name = (char *) argv[0];
286 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
290 if ((cp = getenv ("VERSION_CONTROL")))
291 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
292 backup_args, backup_vals);
295 backup_type = XARGCASEMATCH (program_name, argv[1],
296 backup_args, backup_vals);
298 printf ("The version control is `%s'\n",
299 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));