lib/librefuse/refuse_opt.c

   1 /*      $NetBSD: refuse_opt.c,v 1.13 2007/11/05 13:41:52 pooka Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2007 Juan Romero Pardines.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 /*
  29  * TODO:
  30  *      * -oblah,foo... works, but the options are not enabled.
  31  *      * -ofoo=%s (accepts a string) or -ofoo=%u (int) is not
  32  *        supported for now.
  33  *      * void *data: how is it used? I think it's used to enable
  34  *        options or pass values for the matching options.
  35  */
  36
  37 #include <sys/types.h>
  38
  39 #include <err.h>
  40 #include <fuse.h>
  41 #include <fuse_opt.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #ifdef FUSE_OPT_DEBUG
  47 #define DPRINTF(x)      do { printf x; } while ( /* CONSTCOND */ 0)
  48 #else
  49 #define DPRINTF(x)
  50 #endif
  51
  52 enum {
  53         KEY_HELP,
  54         KEY_VERBOSE,
  55         KEY_VERSION
  56 };
  57
  58 struct fuse_opt_option {
  59         const struct fuse_opt *fop;
  60         char *option;
  61         int key;
  62         void *data;
  63 };
  64
  65 static int fuse_opt_popt(struct fuse_opt_option *, const struct fuse_opt *);
  66
  67 /*
  68  * Public API.
  69  *
  70  * The following functions always return 0:
  71  *
  72  * int  fuse_opt_add_opt(char **, const char *);
  73  *
  74  * We implement the next ones:
  75  *
  76  * int  fuse_opt_add_arg(struct fuse_args *, const char *);
  77  * void fuse_opt_free_args(struct fuse_args *);
  78  * int  fuse_opt_insert_arg(struct fuse_args *, const char *);
  79  * int  fuse_opt_match(const struct fuse_opt *, const char *);
  80  * int  fuse_opt_parse(struct fuse_args *, void *,
  81  *                     const struct fuse_opt *, fuse_opt_proc_t);
  82  *
  83  */
  84
  85 /* ARGSUSED */
  86 int
  87 fuse_opt_add_arg(struct fuse_args *args, const char *arg)
  88 {
  89         struct fuse_args        *ap;
  90
  91         if (args->allocated == 0) {
  92                 ap = fuse_opt_deep_copy_args(args->argc, args->argv);
  93                 args->argv = ap->argv;
  94                 args->argc = ap->argc;
  95                 args->allocated = ap->allocated;
  96                 (void) free(ap);
  97         } else if (args->allocated == args->argc) {
  98                 void *a;
  99                 int na = args->allocated + 10;
 100
 101                 if ((a = realloc(args->argv, na * sizeof(*args->argv))) == NULL)
 102                         return -1;
 103
 104                 args->argv = a;
 105                 args->allocated = na;
 106         }
 107         DPRINTF(("%s: arguments passed: [arg:%s]\n", __func__, arg));
 108         if ((args->argv[args->argc++] = strdup(arg)) == NULL)
 109                 err(1, "fuse_opt_add_arg");
 110         args->argv[args->argc] = NULL;
 111         return 0;
 112 }
 113
 114 struct fuse_args *
 115 fuse_opt_deep_copy_args(int argc, char **argv)
 116 {
 117         struct fuse_args        *ap;
 118         int                      i;
 119
 120         if ((ap = malloc(sizeof(*ap))) == NULL)
 121                 err(1, "_fuse_deep_copy_args");
 122         /* deep copy args structure into channel args */
 123         ap->allocated = ((argc / 10) + 1) * 10;
 124
 125         if ((ap->argv = calloc((size_t)ap->allocated,
 126             sizeof(*ap->argv))) == NULL)
 127                 err(1, "_fuse_deep_copy_args");
 128
 129         for (i = 0; i < argc; i++) {
 130                 if ((ap->argv[i] = strdup(argv[i])) == NULL)
 131                         err(1, "_fuse_deep_copy_args");
 132         }
 133         ap->argv[ap->argc = i] = NULL;
 134         return ap;
 135 }
 136
 137 void
 138 fuse_opt_free_args(struct fuse_args *ap)
 139 {
 140         int     i;
 141
 142         for (i = 0; i < ap->argc; i++) {
 143                 free(ap->argv[i]);
 144         }
 145         free(ap->argv);
 146         ap->argv = NULL;
 147         ap->allocated = ap->argc = 0;
 148 }
 149
 150 /* ARGSUSED */
 151 int
 152 fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
 153 {
 154         int     i;
 155         int     na;
 156         void   *a;
 157
 158         DPRINTF(("%s: arguments passed: [pos=%d] [arg=%s]\n",
 159             __func__, pos, arg));
 160         if (args->argv == NULL) {
 161                 na = 10;
 162                 a = malloc(na * sizeof(*args->argv));
 163         } else {
 164                 na = args->allocated + 10;
 165                 a = realloc(args->argv, na * sizeof(*args->argv));
 166         }
 167         if (a == NULL) {
 168                 warn("fuse_opt_insert_arg");
 169                 return -1;
 170         }
 171         args->argv = a;
 172         args->allocated = na;
 173
 174         for (i = args->argc++; i > pos; --i) {
 175                 args->argv[i] = args->argv[i - 1];
 176         }
 177         if ((args->argv[pos] = strdup(arg)) == NULL)
 178                 err(1, "fuse_opt_insert_arg");
 179         args->argv[args->argc] = NULL;
 180         return 0;
 181 }
 182
 183 /* ARGSUSED */
 184 int fuse_opt_add_opt(char **opts, const char *opt)
 185 {
 186         DPRINTF(("%s: arguments passed: [opts=%s] [opt=%s]\n",
 187             __func__, *opts, opt));
 188         return 0;
 189 }
 190
 191 /*
 192  * Returns 0 if opt was matched with any option from opts,
 193  * otherwise returns 1.
 194  */
 195 int
 196 fuse_opt_match(const struct fuse_opt *opts, const char *opt)
 197 {
 198         while (opts++) {
 199                 if (strcmp(opt, opts->templ) == 0)
 200                         return 0;
 201         }
 202
 203         return 1;
 204 }
 205
 206 /*
 207  * Returns 0 if foo->option was matched with any option from opts,
 208  * and sets the following on match:
 209  *
 210  *      * foo->key is set to the foo->fop->value if offset == -1.
 211  *      * foo->fop points to the matched struct opts.
 212  *
 213  * otherwise returns 1.
 214  */
 215 static int
 216 fuse_opt_popt(struct fuse_opt_option *foo, const struct fuse_opt *opts)
 217 {
 218         int i, found = 0;
 219         char *match;
 220
 221         if (!foo->option) {
 222                 (void)fprintf(stderr, "fuse: missing argument after -o\n");
 223                 return 1;
 224         }
 225         /*
 226          * iterate over argv and opts to see
 227          * if there's a match with any template.
 228          */
 229         for (match = strtok(foo->option, ",");
 230              match; match = strtok(NULL, ",")) {
 231
 232                 DPRINTF(("%s: specified option='%s'\n", __func__, match));
 233                 found = 0;
 234
 235                 for (i = 0; opts && opts->templ; opts++, i++) {
 236
 237                         DPRINTF(("%s: opts->templ='%s' opts->offset=%d "
 238                             "opts->value=%d\n", __func__, opts->templ,
 239                             opts->offset, opts->value));
 240
 241                         /* option is ok */
 242                         if (strcmp(match, opts->templ) == 0) {
 243                                 DPRINTF(("%s: option matched='%s'\n",
 244                                     __func__, match));
 245                                 found++;
 246                                 /*
 247                                  * our fop pointer now points
 248                                  * to the matched struct opts.
 249                                  */
 250                                 foo->fop = opts;
 251                                 /*
 252                                  * assign default key value, necessary for
 253                                  * KEY_HELP, KEY_VERSION and KEY_VERBOSE.
 254                                  */
 255                                 if (foo->fop->offset == -1)
 256                                         foo->key = foo->fop->value;
 257                                 /* reset counter */
 258                                 opts -= i;
 259                                 break;
 260                         }
 261                 }
 262                 /* invalid option */
 263                 if (!found) {
 264                         (void)fprintf(stderr, "fuse: '%s' is not a "
 265                             "valid option\n", match);
 266                         return 1;
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 /* ARGSUSED1 */
 274 int
 275 fuse_opt_parse(struct fuse_args *args, void *data,
 276         const struct fuse_opt *opts, fuse_opt_proc_t proc)
 277 {
 278         struct fuse_opt_option foo;
 279         char *buf;
 280         int i, rv = 0;
 281
 282         if (!args || !args->argv || !args->argc || !proc)
 283                 return 0;
 284
 285         if (args->argc == 1)
 286                 return proc(foo.data, *args->argv, FUSE_OPT_KEY_OPT, args);
 287
 288         /* the real loop to process the arguments */
 289         for (i = 1; i < args->argc; i++) {
 290
 291                 /* assign current argv string */
 292                 foo.option = buf = args->argv[i];
 293
 294                 /* argvn != -foo... */
 295                 if (buf[0] != '-') {
 296
 297                         foo.key = FUSE_OPT_KEY_NONOPT;
 298                         rv = proc(foo.data, foo.option, foo.key, args);
 299                         if (rv != 0)
 300                                 break;
 301
 302                 /* -o was specified... */
 303                 } else if (buf[0] == '-' && buf[1] == 'o') {
 304
 305                         /* -oblah,foo... */
 306                         if (buf[2]) {
 307                                 /* skip -o */
 308                                 foo.option = args->argv[i] + 2;
 309                         /* -o blah,foo... */
 310                         } else {
 311                                 /*
 312                                  * skip current argv and pass to the
 313                                  * next one to parse the options.
 314                                  */
 315                                 ++i;
 316                                 foo.option = args->argv[i];
 317                         }
 318
 319                         rv = fuse_opt_popt(&foo, opts);
 320                         if (rv != 0)
 321                                 break;
 322
 323                 /* help/version/verbose argument */
 324                 } else if (buf[0] == '-' && buf[1] != 'o') {
 325                         /*
 326                          * check if the argument matches
 327                          * with any template in opts.
 328                          */
 329                         rv = fuse_opt_popt(&foo, opts);
 330                         if (rv != 0) {
 331                                 break;
 332                         } else {
 333                                 DPRINTF(("%s: foo.fop->templ='%s' "
 334                                     "foo.fop->offset: %d "
 335                                     "foo.fop->value: %d\n",
 336                                     __func__, foo.fop->templ,
 337                                     foo.fop->offset, foo.fop->value));
 338
 339                                 /* argument needs to be discarded */
 340                                 if (foo.key == FUSE_OPT_KEY_DISCARD) {
 341                                         rv = 1;
 342                                         break;
 343                                 }
 344
 345                                 /* process help/version argument */
 346                                 if (foo.key != KEY_VERBOSE &&
 347                                     foo.key != FUSE_OPT_KEY_KEEP) {
 348                                         rv = proc(foo.data, foo.option,
 349                                                   foo.key, args);
 350                                         break;
 351                                 } else {
 352                                         /* process verbose argument */
 353                                         rv = proc(foo.data, foo.option,
 354                                                        foo.key, args);
 355                                         if (rv != 0)
 356                                                 break;
 357                                 }
 358                         }
 359                 /* unknown option, how could that happen? */
 360                 } else {
 361                         DPRINTF(("%s: unknown option\n", __func__));
 362                         rv = 1;
 363                         break;
 364                 }
 365         }
 366
 367         return rv;
 368 }