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)
42 /* When reporting an invalid argument, show nonprinting characters
43 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
44 literal_quoting_style. */
45 #ifndef ARGMATCH_QUOTING_STYLE
46 # define ARGMATCH_QUOTING_STYLE escape_quoting_style
49 /* The following test is to work around the gross typo in
50 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
51 is defined to 0, not 1. */
54 # define EXIT_FAILURE 1
57 /* Non failing version of argmatch call this function after failing. */
59 # define ARGMATCH_DIE exit (EXIT_FAILURE)
62 #ifdef ARGMATCH_DIE_DECL
72 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
73 Default to __argmatch_die, but allow caller to change this at run-time. */
74 argmatch_exit_fn argmatch_die = __argmatch_die;
77 /* If ARG is an unambiguous match for an element of the
78 null-terminated array ARGLIST, return the index in ARGLIST
79 of the matched element, else -1 if it does not match any element
80 or -2 if it is ambiguous (is a prefix of more than one element).
81 If SENSITIVE, comparison is case sensitive.
83 If VALLIST is none null, use it to resolve ambiguities limited to
87 "y" is a valid argument, for `0', and "n" for `1'. */
90 __argmatch_internal (const char *arg, const char *const *arglist,
91 const char *vallist, size_t valsize,
94 int i; /* Temporary index in ARGLIST. */
95 size_t arglen; /* Length of ARG. */
96 int matchind = -1; /* Index of first nonexact match. */
97 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
99 arglen = strlen (arg);
101 /* Test all elements for either exact match or abbreviated matches. */
102 for (i = 0; arglist[i]; i++)
105 ? !strncmp (arglist[i], arg, arglen)
106 : !strncasecmp (arglist[i], arg, arglen))
108 if (strlen (arglist[i]) == arglen)
109 /* Exact match found. */
111 else if (matchind == -1)
112 /* First nonexact match found. */
116 /* Second nonexact match found. */
118 || memcmp (vallist + valsize * matchind,
119 vallist + valsize * i, valsize))
121 /* There is a real ambiguity, or we could not
134 /* argmatch - case sensitive version */
136 argmatch (const char *arg, const char *const *arglist,
137 const char *vallist, size_t valsize)
139 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
142 /* argcasematch - case insensitive version */
144 argcasematch (const char *arg, const char *const *arglist,
145 const char *vallist, size_t valsize)
147 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
150 /* Error reporting for argmatch.
151 CONTEXT is a description of the type of entity that was being matched.
152 VALUE is the invalid value that was given.
153 PROBLEM is the return value from argmatch. */
156 argmatch_invalid (const char *context, const char *value, int problem)
158 enum quoting_style saved_quoting_style;
161 /* Make sure to have a good quoting style to report errors.
162 literal is insane here. */
163 saved_quoting_style = get_quoting_style (NULL);
164 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
166 format = (problem == -1
167 ? _("invalid argument `%s' for `%s'")
168 : _("ambiguous argument `%s' for `%s'"));
170 error (0, 0, format, quotearg (value), context);
172 set_quoting_style (NULL, saved_quoting_style);
175 /* List the valid arguments for argmatch.
176 ARGLIST is the same as in argmatch.
177 VALLIST is a pointer to an array of values.
178 VALSIZE is the size of the elements of VALLIST */
180 argmatch_valid (const char *const *arglist,
181 const char *vallist, size_t valsize)
184 const char *last_val = NULL;
186 /* We try to put synonyms on the same line. The assumption is that
187 synonyms follow each other */
188 fprintf (stderr, _("Valid arguments are:"));
189 for (i = 0; arglist[i]; i++)
191 || memcmp (last_val, vallist + valsize * i, valsize))
193 fprintf (stderr, "\n - `%s'", arglist[i]);
194 last_val = vallist + valsize * i;
198 fprintf (stderr, ", `%s'", arglist[i]);
203 /* Never failing versions of the previous functions.
205 CONTEXT is the context for which argmatch is called (e.g.,
206 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
207 calls the (supposed never to return) function EXIT_FN. */
210 __xargmatch_internal (const char *context,
211 const char *arg, const char *const *arglist,
212 const char *vallist, size_t valsize,
214 argmatch_exit_fn exit_fn)
216 int res = __argmatch_internal (arg, arglist,
223 /* We failed. Explain why. */
224 argmatch_invalid (context, arg, res);
225 argmatch_valid (arglist, vallist, valsize);
228 return -1; /* To please the compilers. */
231 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
232 return the first corresponding argument in ARGLIST */
234 argmatch_to_argument (const char *value,
235 const char *const *arglist,
236 const char *vallist, size_t valsize)
240 for (i = 0; arglist[i]; i++)
241 if (!memcmp (value, vallist + valsize * i, valsize))
248 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
251 extern const char *getenv ();
253 /* When to make backup files. */
256 /* Never make backups. */
259 /* Make simple backups of every file. */
262 /* Make numbered backups of files that already have numbered backups,
263 and simple backups of the others. */
266 /* Make numbered backups of every file. */
270 /* Two tables describing arguments (keys) and their corresponding
272 static const char *const backup_args[] =
281 static const enum backup_type backup_vals[] =
285 numbered_existing, numbered_existing,
290 main (int argc, const char *const *argv)
293 enum backup_type backup_type = none;
295 program_name = (char *) argv[0];
299 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
303 if ((cp = getenv ("VERSION_CONTROL")))
304 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
305 backup_args, backup_vals);
308 backup_type = XARGCASEMATCH (program_name, argv[1],
309 backup_args, backup_vals);
311 printf ("The version control is `%s'\n",
312 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));