| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: mdwopt.c,v 1.3 1999/05/14 18:51:42 mdw Exp $ |
| 4 | * |
| 5 | * Options parsing, similar to GNU @getopt_long@ |
| 6 | * |
| 7 | * (c) 1996 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of many programs. |
| 13 | * |
| 14 | * `mdwopt' is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * `mdwopt' is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with `mdwopt'; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: mdwopt.c,v $ |
| 33 | * Revision 1.3 1999/05/14 18:51:42 mdw |
| 34 | * Reformat the LGPL notice slightly. |
| 35 | * |
| 36 | * Revision 1.2 1999/05/13 22:57:23 mdw |
| 37 | * Change `-ise' to `-ize' throughout. |
| 38 | * |
| 39 | * Revision 1.1.1.1 1999/05/05 19:23:47 mdw |
| 40 | * New import. The old CVS repository was lost in a disk disaster. |
| 41 | * |
| 42 | * --- Previous lives --- |
| 43 | * |
| 44 | * %Log: mdwopt.c,v % |
| 45 | * Revision 1.7 1997/09/11 09:19:11 mdw |
| 46 | * (mo__nextWord): Arrrgh. Don't free the environment variable buffer! |
| 47 | * People are still using it! |
| 48 | * |
| 49 | * Revision 1.6 1997/09/11 09:05:54 mdw |
| 50 | * (mo__nextWord): Fix bug which returns too many words from environment |
| 51 | * variables. |
| 52 | * |
| 53 | * Revision 1.5 1997/08/09 20:27:59 mdw |
| 54 | * Fix spelling of `Licensing'. |
| 55 | * |
| 56 | * Revision 1.4 1997/07/29 21:11:35 mdw |
| 57 | * Reformatted. Fixed buffer overflow when dealing with environment |
| 58 | * variables. Included NT in list of daft operating systems with `\' as a |
| 59 | * path separator. Fixed address of the FSF. |
| 60 | * |
| 61 | * Revision 1.3 1997/02/26 00:41:10 mdw |
| 62 | * Added GPL notice to the top. Slight formatting changes. |
| 63 | * |
| 64 | * Revision 1.2 1996/10/28 13:12:13 mdw |
| 65 | * Fixed calls to ctype.h routines. Arguments are cast to unsigned char |
| 66 | * to avoid invoking undefined behaviour caused by signedness of chars. |
| 67 | * |
| 68 | * Revision 1.1 1996/09/24 18:01:28 mdw |
| 69 | * Initial revision |
| 70 | * |
| 71 | */ |
| 72 | |
| 73 | /*----- External dependencies ---------------------------------------------*/ |
| 74 | |
| 75 | #include <ctype.h> |
| 76 | #include <stdio.h> |
| 77 | #include <stdlib.h> |
| 78 | #include <string.h> |
| 79 | |
| 80 | #include "mdwopt.h" |
| 81 | |
| 82 | /*----- Configuration things ----------------------------------------------*/ |
| 83 | |
| 84 | #if defined(__riscos) |
| 85 | # define PATHSEP '.' |
| 86 | #elif defined(__OS2__) || defined(__MSDOS__) || defined(__WINNT__) |
| 87 | # define PATHSEP '\\' |
| 88 | #else /* Assume a sane filing system */ |
| 89 | # define PATHSEP '/' |
| 90 | #endif |
| 91 | |
| 92 | /*----- Global variables --------------------------------------------------*/ |
| 93 | |
| 94 | mdwopt_data mdwopt_global = {0, 0, 0, 1, 0, 0, 0, 0, 0}; |
| 95 | |
| 96 | enum { |
| 97 | ord__permute = 0, /* Permute the options (default) */ |
| 98 | ord__return = 1, /* Return non-option things */ |
| 99 | ord__posix = 2, /* Do POSIX-type hacking */ |
| 100 | ord__negate = 4 /* Magic negate-next-thing flag */ |
| 101 | }; |
| 102 | |
| 103 | /*----- Main code ---------------------------------------------------------*/ |
| 104 | |
| 105 | /* --- @mo__nextWord@ --- * |
| 106 | * |
| 107 | * Arguments: @int argc@ = number of command line options |
| 108 | * @char *argv[]@ = pointer to command line options |
| 109 | * @mdwopt_data *data@ = pointer to persistent state |
| 110 | * |
| 111 | * Returns: Pointer to the next word to handle, or 0 |
| 112 | * |
| 113 | * Use: Extracts the next word from the command line or environment |
| 114 | * variable. |
| 115 | */ |
| 116 | |
| 117 | static char *mo__nextWord(int argc, char *const *argv, mdwopt_data *data) |
| 118 | { |
| 119 | if (data->ind == -1) { |
| 120 | char *p = data->env; |
| 121 | char *q; |
| 122 | while (isspace((unsigned char)*p)) |
| 123 | p++; |
| 124 | q = p; |
| 125 | while (*p && !isspace((unsigned char)*p)) |
| 126 | p++; |
| 127 | data->env = p; |
| 128 | if (*p) |
| 129 | *p++ = 0; |
| 130 | if (p != q) |
| 131 | return (q); |
| 132 | data->env = 0; |
| 133 | data->ind = 1; |
| 134 | } |
| 135 | |
| 136 | if (data->next == argc) |
| 137 | return (0); |
| 138 | return (argv[data->next++]); |
| 139 | } |
| 140 | |
| 141 | /* --- @mo__permute@ --- * |
| 142 | * |
| 143 | * Arguments: @char *argv[]@ = pointer to command line arguments |
| 144 | * @mdwopt_data *data@ = pointer to persistent data |
| 145 | * |
| 146 | * Returns: -- |
| 147 | * |
| 148 | * Use: Moves a command line option into the right place. |
| 149 | */ |
| 150 | |
| 151 | static void mo__permute(char *const *argv, mdwopt_data *data) |
| 152 | { |
| 153 | char **v = (char **)argv; |
| 154 | if (data->ind != -1) { |
| 155 | int i = data->next - 1; |
| 156 | char *p = v[i]; |
| 157 | while (i > data->ind) { |
| 158 | v[i] = v[i - 1]; |
| 159 | i--; |
| 160 | } |
| 161 | v[i] = p; |
| 162 | data->ind++; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* --- @mo__findOpt@ --- * |
| 167 | * |
| 168 | * Arguments: @int o@ = which option to search for |
| 169 | * @const char *shortopt@ = short options string to search |
| 170 | * @mdwopt_data *data@ = pointer to persistant state |
| 171 | * |
| 172 | * Returns: Pointer to rest of short options string (including magic |
| 173 | * characters) |
| 174 | * |
| 175 | * Use: Looks up a short option in the given string. |
| 176 | */ |
| 177 | |
| 178 | static const char *mo__findOpt(int o, const char *shortopt, |
| 179 | mdwopt_data *data) |
| 180 | { |
| 181 | const char *p = shortopt; /* Point to short opts table */ |
| 182 | for (;;) { |
| 183 | if (!*p) /* No more options left */ |
| 184 | return (0); |
| 185 | |
| 186 | if (o != *p || (p[1] != '+' && data->order & ord__negate)) { |
| 187 | p++; /* Skip this option entry */ |
| 188 | while (*p == '+') /* Jump a `%|+|%' sign */ |
| 189 | p++; |
| 190 | while (*p == ':') /* And jump any `%|:|%' characters */ |
| 191 | p++; /* Just in case there are any */ |
| 192 | } |
| 193 | else |
| 194 | return (p + 1); |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /* --- @mdwopt@ --- * |
| 199 | * |
| 200 | * Arguments: @int argc@ = number of command line arguments |
| 201 | * @char * const *argv@ = pointer to command line arguments |
| 202 | * @const char *shortopt@ = pointer to short options information |
| 203 | * @const struct option *longopts@ = pointer to long opts info |
| 204 | * @int *longind@ = where to store matched longopt |
| 205 | * @mdwopt_data *data@ = persistent state for the parser |
| 206 | * @int flags@ = various useful flags |
| 207 | * |
| 208 | * Returns: Value of option found next, or an error character, or |
| 209 | * @EOF@ for the last thing. |
| 210 | * |
| 211 | * Use: Reads options. The routine should be more-or-less compatible |
| 212 | * with standard getopts, although it provides many more |
| 213 | * features even than the standard GNU implementation. |
| 214 | * |
| 215 | * The precise manner of options parsing is determined by |
| 216 | * various flag settings, which are described below. By setting |
| 217 | * flag values appropriately, you can achieve behaviour very |
| 218 | * similar to most other getopt routines. |
| 219 | * |
| 220 | * |
| 221 | * How options parsing appears to users |
| 222 | * |
| 223 | * A command line consists of a number of `words' (which may |
| 224 | * contain spaces, according to various shell quoting |
| 225 | * conventions). A word may be an option, an argument to an |
| 226 | * option, or a non-option. An option begins with a special |
| 227 | * character, usually `%|-|%', although `%|+|%' is also used |
| 228 | * sometimes. As special exceptions, the word containing only a |
| 229 | * `%|-|%' is considered to be a non-option, since it usually |
| 230 | * represents standard input or output as a filename, and the |
| 231 | * word containing a double-dash `%|--|%' is used to mark all |
| 232 | * following words as being non-options regardless of their |
| 233 | * initial character. |
| 234 | * |
| 235 | * Traditionally, all words after the first non-option have been |
| 236 | * considered to be non-options automatically, so that options |
| 237 | * must be specified before filenames. However, this |
| 238 | * implementation can extract all the options from the command |
| 239 | * line regardless of their position. This can usually be |
| 240 | * disabled by setting one of the environment variables |
| 241 | * `%|POSIXLY_CORRECT|%' or `%|_POSIX_OPTION_ORDER|%'. |
| 242 | * |
| 243 | * There are two different styles of options: `short' and |
| 244 | * `long'. |
| 245 | * |
| 246 | * Short options are the sort which Unix has known for ages: an |
| 247 | * option is a single letter, preceded by a `%|-|%'. Short |
| 248 | * options can be joined together to save space (and possibly to |
| 249 | * make silly words): e.g., instead of giving options |
| 250 | * `%|-x -y|%', a user could write `%|-xy|%'. Some short |
| 251 | * options can have arguments, which appear after the option |
| 252 | * letter, either immediately following, or in the next `word' |
| 253 | * (so an option with an argument could be written as |
| 254 | * `%|-o foo|%' or as `%|-ofoo|%'). Note that options with |
| 255 | * optional arguments must be written in the second style. |
| 256 | * |
| 257 | * When a short option controls a flag setting, it is sometimes |
| 258 | * possible to explicitly turn the flag off, as well as turning |
| 259 | * it on, (usually to override default options). This is |
| 260 | * usually done by using a `%|+|%' instead of a `%|-|%' to |
| 261 | * introduce the option. |
| 262 | * |
| 263 | * Long options, as popularized by the GNU utilities, are given |
| 264 | * long-ish memorable names, preceded by a double-dash `%|--|%'. |
| 265 | * Since their names are more than a single character, long |
| 266 | * options can't be combined in the same way as short options. |
| 267 | * Arguments to long options may be given either in the same |
| 268 | * `word', separated from the option name by an equals sign, or |
| 269 | * in the following `word'. |
| 270 | * |
| 271 | * Long option names can be abbreviated if necessary, as long |
| 272 | * as the abbreviation is unique. This means that options can |
| 273 | * have sensible and memorable names but still not require much |
| 274 | * typing from an experienced user. |
| 275 | * |
| 276 | * Like short options, long options can control flag settings. |
| 277 | * The options to manipulate these settings come in pairs: an |
| 278 | * option of the form `%|--set-flag|%' might set the flag, while |
| 279 | * an option of the form `%|--no-set-flag|%' might clear it. |
| 280 | * |
| 281 | * It is usual for applications to provide both short and long |
| 282 | * options with identical behaviour. Some applications with |
| 283 | * lots of options may only provide long options (although they |
| 284 | * will often be only two or three characters long). In this |
| 285 | * case, long options can be preceded with a single `%|-|%' |
| 286 | * character, and negated by a `%|+|%' character. |
| 287 | * |
| 288 | * Finally, some (older) programs accept arguments of the form |
| 289 | * `%%@.{"-"<number>}%%', to set some numerical parameter, |
| 290 | * typically a line count of some kind. |
| 291 | * |
| 292 | * |
| 293 | * How programs parse options |
| 294 | * |
| 295 | * An application parses its options by calling mdwopt |
| 296 | * repeatedly. Each time it is called, mdwopt returns a value |
| 297 | * describing the option just read, and stores information about |
| 298 | * the option in a data block. The value %$-1$% is returned |
| 299 | * when there are no more options to be read. The `%|?|%' |
| 300 | * character is returned when an error is encountered. |
| 301 | * |
| 302 | * Before starting to parse options, the value @data->ind@ must |
| 303 | * be set to 0 or 1. The value of @data->err@ can also be set, |
| 304 | * to choose whether errors are reported by mdwopt. |
| 305 | * |
| 306 | * The program's `@argc@' and `@argv@' arguments are passed to |
| 307 | * the options parser, so that it can read the command line. A |
| 308 | * flags word is also passed, allowing the program fine control |
| 309 | * over parsing. The flags are described above. |
| 310 | * |
| 311 | * Short options are described by a string, which once upon a |
| 312 | * time just contained the permitted option characters. Now the |
| 313 | * options string begins with a collection of flag characters, |
| 314 | * and various flag characters can be put after options |
| 315 | * characters to change their properties. |
| 316 | * |
| 317 | * If the first character of the short options string is |
| 318 | * `%|+|%', `%|-|%' or `%|!|%', the order in which options are |
| 319 | * read is modified, as follows: |
| 320 | * |
| 321 | * `%|+|%' forces the POSIX order to be used. As soon as a non- |
| 322 | * option is found, mdwopt returns %$-1$%. |
| 323 | * |
| 324 | * `%|-|%' makes mdwopt treat non-options as being `special' |
| 325 | * sorts of option. When a non-option word is found, the |
| 326 | * value 0 is returned, and the actual text of the word |
| 327 | * is stored as being the option's argument. |
| 328 | * |
| 329 | * `%|!|%' forces the default order to be used. The entire |
| 330 | * command line is scanned for options, which are |
| 331 | * returned in order. However, during this process, |
| 332 | * the options are moved in the @argv@ array, so that |
| 333 | * they appear before the non- options. |
| 334 | * |
| 335 | * A `%|:|%' character may be placed after the ordering flag (or |
| 336 | * at the very beginning if no ordering flag is given) which |
| 337 | * indicates that the character `%|:|%', rather than `%|?|%', |
| 338 | * should be returned if a missing argument error is detected. |
| 339 | * |
| 340 | * Each option in the string can be followed by a `%|+|%' sign, |
| 341 | * indicating that it can be negated, a `%|:|%' sign indicating |
| 342 | * that it requires an argument, or a `%|::|%' string, |
| 343 | * indicating an optional argument. Both `%|+|%' and `%|:|%' or |
| 344 | * `%|::|%' may be given, although the `%|+|%' must come first. |
| 345 | * |
| 346 | * If an option is found, the option character is returned to |
| 347 | * the caller. A pointer to an argument is stored in |
| 348 | * @data->arg@, or @NULL@ is stored if there was no argument. |
| 349 | * If a negated option was found, the option character is |
| 350 | * returned ORred with @gFlag_negated@ (bit 8 set). |
| 351 | * |
| 352 | * Long options are described in a table. Each entry in the |
| 353 | * table is of type @struct option@, and the table is terminated |
| 354 | * by an entry whose @name@ field is null. Each option has |
| 355 | * a flags word which, due to historical reasons, is called |
| 356 | * @has_arg@. This describes various properties of the option, |
| 357 | * such as what sort of argument it takes, and whether it can |
| 358 | * be negated. |
| 359 | * |
| 360 | * When mdwopt finds a long option, it looks the name up in the |
| 361 | * table. The index of the matching entry is stored in the |
| 362 | * @longind@ variable, passed to mdwopt (unless @longind@ is 0): |
| 363 | * a value of %$-1$% indicates that no long option was |
| 364 | * found. The behaviour is then dependent on the values in the |
| 365 | * table entry. If @flag@ is nonzero, it points to an integer |
| 366 | * to be modified by mdwopt. Usually the value in the @val@ |
| 367 | * field is simply stored in the @flag@ variable. If the flag |
| 368 | * @gFlag_switch@ is set, however, the value is combined with |
| 369 | * the existing value of the flags using a bitwise OR. If |
| 370 | * @gFlag_negate@ is set, then the flag bit will be cleared if a |
| 371 | * matching negated long option is found. The value 0 is |
| 372 | * returned. |
| 373 | * |
| 374 | * If @flag@ is zero, the value in @val@ is returned by mdwopt, |
| 375 | * possibly with bit 8 set if the option was negated. |
| 376 | * |
| 377 | * Arguments for long options are stored in @data->arg@, as |
| 378 | * before. |
| 379 | * |
| 380 | * Numeric options, if enabled, cause the value `%|#|%' to be |
| 381 | * returned, and the numeric value to be stored in @data->opt@. |
| 382 | * |
| 383 | * If the flag @gFlag_envVar@ is set on entry, options will be |
| 384 | * extracted from an environment variable whose name is built by |
| 385 | * capitalising all the letters of the program's name. (This |
| 386 | * allows a user to have different default settings for a |
| 387 | * program, by calling it through different symbolic links.) */ |
| 388 | |
| 389 | int mdwopt(int argc, char *const *argv, |
| 390 | const char *shortopt, |
| 391 | const struct option *longopts, int *longind, |
| 392 | mdwopt_data *data, int flags) |
| 393 | { |
| 394 | /* --- Local variables --- */ |
| 395 | |
| 396 | char *p, *q, *r; /* Some useful things to have */ |
| 397 | char *prefix; /* Prefix from this option */ |
| 398 | int i; /* Always useful */ |
| 399 | char noarg = '?'; /* Standard missing-arg char */ |
| 400 | |
| 401 | /* --- Sort out our data --- */ |
| 402 | |
| 403 | if (!data) /* If default data requested */ |
| 404 | data = &mdwopt_global; /* Then use the global stuff */ |
| 405 | |
| 406 | /* --- See if this is the first time --- */ |
| 407 | |
| 408 | if (data->ind == 0 || (data->ind == 1 && ~flags & gFlag_noProgName)) { |
| 409 | |
| 410 | /* --- Sort out default returning order --- */ |
| 411 | |
| 412 | if (getenv("_POSIX_OPTION_ORDER") || /* Examine environment for opts */ |
| 413 | getenv("POSIXLY_CORRECT")) /* To see if we disable features */ |
| 414 | data->order = ord__posix; /* If set, use POSIX ordering */ |
| 415 | else |
| 416 | data->order = ord__permute; /* Otherwise mangle the options */ |
| 417 | |
| 418 | /* --- Now see what the caller actually wants --- */ |
| 419 | |
| 420 | switch (shortopt[0]) { /* Look at the first character */ |
| 421 | case '-': /* `%|-|%' turns on in-orderness */ |
| 422 | data->order = ord__return; |
| 423 | break; |
| 424 | case '+': /* `%|+|%' turns on POSIXness */ |
| 425 | data->order = ord__posix; |
| 426 | break; |
| 427 | case '!': /* `%|!|%' ignores POSIXness */ |
| 428 | data->order = ord__permute; |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | /* --- Now decide on the program's name --- */ |
| 433 | |
| 434 | if (~flags & gFlag_noProgName) { |
| 435 | p = q = (char *)argv[0]; |
| 436 | while (*p) { |
| 437 | if (*p++ == PATHSEP) |
| 438 | q = p; |
| 439 | } |
| 440 | data->prog = q; |
| 441 | |
| 442 | data->ind = data->next = 1; |
| 443 | data->list = 0; |
| 444 | |
| 445 | /* --- See about environment variables --- * |
| 446 | * |
| 447 | * Be careful. The program may be setuid, and an attacker might have |
| 448 | * given us a long name in @argv[0]@. If the name is very long, don't |
| 449 | * support this option. |
| 450 | */ |
| 451 | |
| 452 | if (flags & gFlag_envVar && strlen(data->prog) < 48) { |
| 453 | |
| 454 | char buf[64]; |
| 455 | |
| 456 | /* --- For RISC OS, support a different format --- * |
| 457 | * |
| 458 | * Acorn's RISC OS tends to put settings in variables named |
| 459 | * `App$Options' rather than `APP'. Under RISC OS, I'll support |
| 460 | * both methods, just to avoid confuddlement. |
| 461 | */ |
| 462 | |
| 463 | #ifdef __riscos |
| 464 | sprintf(buf, "%s$Options", data->prog); |
| 465 | p = getenv(buf); |
| 466 | if (!p) { |
| 467 | #endif |
| 468 | |
| 469 | p = buf; /* Point to a buffer */ |
| 470 | q = data->prog; /* Point to program name */ |
| 471 | while (*q) /* While characters left here */ |
| 472 | *p++ = toupper(*q++); /* Copy and uppercase */ |
| 473 | *p++ = 0; /* Terminate my copy of this */ |
| 474 | p = getenv(buf); /* Get the value of the variable */ |
| 475 | |
| 476 | #ifdef __riscos |
| 477 | } |
| 478 | #endif |
| 479 | |
| 480 | /* --- Copy the options string into a buffer --- */ |
| 481 | |
| 482 | if (p) { /* If it is defined */ |
| 483 | q = malloc(strlen(p) + 1); /* Allocate space for a copy */ |
| 484 | if (!q) { /* If that failed */ |
| 485 | fprintf(stderr, /* Report a nice error */ |
| 486 | "%s: Not enough memory to read settings in " |
| 487 | "environment variable\n", |
| 488 | data->prog); |
| 489 | } else { /* Otherwise */ |
| 490 | strcpy(q, p); /* Copy the text over */ |
| 491 | data->ind = -1; /* Mark that we're parsing envvar */ |
| 492 | data->env = data->estart = q; /* And store the pointer away */ |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | } |
| 497 | } |
| 498 | else |
| 499 | data->ind = data->next = 0; |
| 500 | } |
| 501 | |
| 502 | /* --- Do some initial bodgery --- * |
| 503 | * |
| 504 | * The @shortopt@ string can have some interesting characters at the |
| 505 | * beginning. We'll skip past them. |
| 506 | */ |
| 507 | |
| 508 | switch (shortopt[0]) { |
| 509 | case '+': |
| 510 | case '-': |
| 511 | case '!': |
| 512 | shortopt++; |
| 513 | break; |
| 514 | } |
| 515 | |
| 516 | if (shortopt[0] == ':') { |
| 517 | noarg = shortopt[0]; |
| 518 | shortopt++; |
| 519 | } |
| 520 | |
| 521 | if (longind) /* Allow longind to be null */ |
| 522 | *longind = -1; /* Clear this to avoid confusion */ |
| 523 | data->opt = -1; /* And this too */ |
| 524 | data->arg = 0; /* No option set up here */ |
| 525 | |
| 526 | /* --- Now go off and search for an option --- */ |
| 527 | |
| 528 | if (!data->list || !*data->list) { |
| 529 | data->order &= 3; /* Clear negation flag */ |
| 530 | |
| 531 | /* --- Now we need to find the next option --- * |
| 532 | * |
| 533 | * Exactly how we do this depends on the settings of the order variable. |
| 534 | * We identify options as being things starting with `%|-|%', and which |
| 535 | * aren't equal to `%|-|%' or `%|--|%'. We'll look for options until: |
| 536 | * |
| 537 | * * We find something which isn't an option AND @order == ord__posix@ |
| 538 | * * We find a `%|--|%' |
| 539 | * * We reach the end of the list |
| 540 | * |
| 541 | * There are some added little wrinkles, which we'll meet as we go. |
| 542 | */ |
| 543 | |
| 544 | for (;;) { /* Keep looping for a while */ |
| 545 | p = mo__nextWord(argc, argv, data); /* Get the next word out */ |
| 546 | if (!p) /* If there's no next word */ |
| 547 | return (EOF); /* There's no more now */ |
| 548 | |
| 549 | /* --- See if we've found an option --- */ |
| 550 | |
| 551 | if ((p[0] == '-' || (p[0] == '+' && flags & gFlag_negation)) && |
| 552 | p[1] != 0) { |
| 553 | if (strcmp(p, "--") == 0) { /* If this is the magic marker */ |
| 554 | mo__permute(argv, data); /* Stow the magic marker item */ |
| 555 | return (EOF); /* There's nothing else to do */ |
| 556 | } |
| 557 | break; /* We've found something! */ |
| 558 | } |
| 559 | |
| 560 | /* --- Figure out how to proceed --- */ |
| 561 | |
| 562 | switch (data->order & 3) { |
| 563 | case ord__posix: /* POSIX option order */ |
| 564 | return (EOF); /* This is easy */ |
| 565 | break; |
| 566 | case ord__permute: /* Permute the option order */ |
| 567 | break; |
| 568 | case ord__return: /* Return each argument */ |
| 569 | mo__permute(argv, data); /* Insert word in same place */ |
| 570 | data->arg = p; /* Point to the argument */ |
| 571 | return (0); /* Return the value */ |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | /* --- We found an option --- */ |
| 576 | |
| 577 | mo__permute(argv, data); /* Do any permuting necessary */ |
| 578 | |
| 579 | /* --- Check for a numeric option --- * |
| 580 | * |
| 581 | * We only check the first character (or the second if the first is a |
| 582 | * sign). This ought to be enough. |
| 583 | */ |
| 584 | |
| 585 | if (flags & gFlag_numbers && (p[0] == '-' || flags & gFlag_negNumber)) { |
| 586 | if (((p[1] == '+' || p[1] == '-') && isdigit((unsigned char)p[2])) || |
| 587 | isdigit((unsigned char)p[1])) { |
| 588 | data->opt = strtol(p + 1, &data->arg, 10); |
| 589 | while (isspace((unsigned char)data->arg[0])) |
| 590 | data->arg++; |
| 591 | if (!data->arg[0]) |
| 592 | data->arg = 0; |
| 593 | return (p[0] == '-' ? '#' : '#' | gFlag_negated); |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | /* --- Check for a long option --- */ |
| 598 | |
| 599 | if (p[0] == '+') |
| 600 | data->order |= ord__negate; |
| 601 | |
| 602 | if (((p[0] == '-' && p[1] == '-') || |
| 603 | (flags & gFlag_noShorts && !mo__findOpt(p[1], shortopt, data))) && |
| 604 | (~flags & gFlag_noLongs)) /* Is this a long option? */ |
| 605 | { |
| 606 | int match = -1; /* Count matches as we go */ |
| 607 | |
| 608 | if (p[0] == '+') { /* If it's negated */ |
| 609 | data->order |= ord__negate; /* Set the negate flag */ |
| 610 | p++; /* Point to the main text */ |
| 611 | prefix = "+"; /* Set the prefix string up */ |
| 612 | } else if (p[1] == '-') { /* If this is a `%|--|%' option */ |
| 613 | if ((flags & gFlag_negation) && strncmp(p + 2, "no-", 3) == 0) { |
| 614 | p += 5; /* Point to main text */ |
| 615 | prefix = "--no-"; /* And set the prefix */ |
| 616 | data->order |= ord__negate; /* Set the negatedness flag */ |
| 617 | } else { |
| 618 | p += 2; /* Point to the main text */ |
| 619 | prefix = "--"; /* Remember the prefix string */ |
| 620 | } |
| 621 | } else { |
| 622 | if ((flags & gFlag_negation) && strncmp(p + 1, "no-", 3) == 0) { |
| 623 | p += 4; /* Find the text */ |
| 624 | prefix = "-no-"; /* Set the prefix */ |
| 625 | data->order |= ord__negate; /* Set negatedness flag */ |
| 626 | } else { |
| 627 | p++; /* Otherwise find the text */ |
| 628 | prefix = "-"; /* And remember the prefix */ |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | for (i = 0; longopts[i].name; i++) { /* Loop through the options */ |
| 633 | if ((data->order & ord__negate) && |
| 634 | (~longopts[i].has_arg & gFlag_negate)) |
| 635 | continue; /* If neg and opt doesn't allow */ |
| 636 | |
| 637 | r = (char *) longopts[i].name; /* Point to the name string */ |
| 638 | q = p; /* Point to the string start */ |
| 639 | for (;;) { /* Do a loop here */ |
| 640 | if (*q == 0 || *q == '=') { /* End of the option string? */ |
| 641 | if (*r == 0) { /* If end of other string */ |
| 642 | match = i; /* This is the match */ |
| 643 | goto botched; /* And exit the loop now */ |
| 644 | } |
| 645 | if (match == -1) { /* If no match currently */ |
| 646 | match = i; /* Then this is it, here */ |
| 647 | break; /* Stop looking now */ |
| 648 | } else { |
| 649 | match = -1; /* Else it's ambiguous */ |
| 650 | goto botched; /* So give up right now */ |
| 651 | } |
| 652 | } |
| 653 | else if (*q != *r) /* Otherwise if mismatch */ |
| 654 | break; /* Abort this loop */ |
| 655 | q++, r++; /* Increment the counters */ |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | botched: |
| 660 | if (match == -1) { /* If we couldn't find a match */ |
| 661 | if (data->err) { |
| 662 | fprintf(stderr, "%s: unrecognized option `%s%s'\n", |
| 663 | data->prog, |
| 664 | prefix, p); |
| 665 | } |
| 666 | return ('?'); |
| 667 | } |
| 668 | |
| 669 | if (longind) /* Allow longind to be null */ |
| 670 | *longind = match; /* Store the match away */ |
| 671 | |
| 672 | /* --- Handle argument behaviour --- */ |
| 673 | |
| 674 | while (*p != 0 && *p != '=') /* Find the argument string */ |
| 675 | p++; |
| 676 | p = (*p ? p + 1 : 0); /* Sort out argument presence */ |
| 677 | q = (char *) longopts[match].name; /* Remember the name here */ |
| 678 | |
| 679 | switch (longopts[match].has_arg & 3) { |
| 680 | case no_argument: |
| 681 | if (p) { |
| 682 | if (data->err) { |
| 683 | fprintf(stderr, |
| 684 | "%s: option `%s%s' does not accept arguments\n", |
| 685 | data->prog, |
| 686 | prefix, q); |
| 687 | } |
| 688 | return ('?'); |
| 689 | } |
| 690 | break; |
| 691 | |
| 692 | case required_argument: |
| 693 | if (!p) { /* If no argument given */ |
| 694 | p = mo__nextWord(argc, argv, data); |
| 695 | |
| 696 | if (!p) { /* If no more arguments */ |
| 697 | if (data->err) { |
| 698 | fprintf(stderr, "%s: option `%s%s' requires an argument\n", |
| 699 | data->prog, |
| 700 | prefix, q); |
| 701 | } |
| 702 | return (noarg); |
| 703 | } |
| 704 | |
| 705 | mo__permute(argv, data); |
| 706 | } |
| 707 | break; |
| 708 | |
| 709 | case optional_argument: |
| 710 | /* Who cares? */ |
| 711 | break; |
| 712 | } |
| 713 | data->arg = p; |
| 714 | |
| 715 | /* --- Do correct things now we have a match --- */ |
| 716 | |
| 717 | if (longopts[match].flag) { /* If he has a @flag@ argument */ |
| 718 | if (longopts[match].has_arg & gFlag_switch) { |
| 719 | if (data->order & ord__negate) |
| 720 | *longopts[match].flag &= ~longopts[match].val; |
| 721 | else |
| 722 | *longopts[match].flag |= longopts[match].val; |
| 723 | } else { |
| 724 | if (data->order & ord__negate) |
| 725 | *longopts[match].flag = 0; |
| 726 | else |
| 727 | *longopts[match].flag = longopts[match].val; |
| 728 | } |
| 729 | return (0); /* And return something */ |
| 730 | } else { |
| 731 | if (data->order & ord__negate) |
| 732 | return (longopts[match].val | gFlag_negated); |
| 733 | else |
| 734 | return (longopts[match].val); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | /* --- Do short options things --- */ |
| 739 | |
| 740 | else { |
| 741 | if (p[0] == '+') /* If starts with a `%|+|%' */ |
| 742 | data->order |= ord__negate; |
| 743 | data->list = p + 1; /* Omit leading `%|-|%'/`%|+|%' */ |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | /* --- Now process the short options --- */ |
| 748 | |
| 749 | i = *data->list++; /* Get the next option letter */ |
| 750 | data->opt = i; /* Store this away nicely */ |
| 751 | |
| 752 | p = (char *) mo__findOpt(i, shortopt, data); |
| 753 | if (!p) { /* No more options left */ |
| 754 | if (data->err) { |
| 755 | fprintf(stderr, "%s: unknown option `%c%c'\n", |
| 756 | data->prog, |
| 757 | data->order & ord__negate ? '+' : '-', |
| 758 | i); |
| 759 | } |
| 760 | return ('?'); |
| 761 | } |
| 762 | |
| 763 | data->opt = i; /* Store this for the caller */ |
| 764 | |
| 765 | /* --- Sort out an argument, if we expect one --- */ |
| 766 | |
| 767 | if (p[0] == ':') { /* If we expect an option */ |
| 768 | q = (data->list[0] ? data->list : 0); /* If argument expected, use it */ |
| 769 | data->list = 0; /* Kill the remaining options */ |
| 770 | if (p[1] != ':' && !q) { /* If no arg, and not optional */ |
| 771 | |
| 772 | /* --- Same code as before --- */ |
| 773 | |
| 774 | q = mo__nextWord(argc, argv, data); /* Read the next word */ |
| 775 | if (!q) { /* If no more arguments */ |
| 776 | if (data->err) { |
| 777 | fprintf(stderr, "%s: option `%c%c' requires an argument\n", |
| 778 | data->prog, |
| 779 | data->order & ord__negate ? '+' : '-', |
| 780 | i); |
| 781 | } |
| 782 | return (noarg); |
| 783 | } |
| 784 | mo__permute(argv, data); |
| 785 | } |
| 786 | |
| 787 | data->arg = q; |
| 788 | } |
| 789 | return ((data->order & ord__negate) ? i | gFlag_negated : i); |
| 790 | } |
| 791 | |
| 792 | /*----- That's all, folks -------------------------------------------------*/ |