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path: root/libfuse-lite/fuse_opt.c (plain)
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1/*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU LGPLv2.
6 See the file COPYING.LIB
7*/
8
9#include "config.h"
10#include "fuse_opt.h"
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <assert.h>
16
17struct fuse_opt_context {
18 void *data;
19 const struct fuse_opt *opt;
20 fuse_opt_proc_t proc;
21 int argctr;
22 int argc;
23 char **argv;
24 struct fuse_args outargs;
25 char *opts;
26 int nonopt;
27};
28
29void fuse_opt_free_args(struct fuse_args *args)
30{
31 if (args) {
32 if (args->argv && args->allocated) {
33 int i;
34 for (i = 0; i < args->argc; i++)
35 free(args->argv[i]);
36 free(args->argv);
37 }
38 args->argc = 0;
39 args->argv = NULL;
40 args->allocated = 0;
41 }
42}
43
44static int alloc_failed(void)
45{
46 fprintf(stderr, "fuse: memory allocation failed\n");
47 return -1;
48}
49
50int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
51{
52 char **newargv;
53 char *newarg;
54
55 assert(!args->argv || args->allocated);
56
57 newargv = realloc(args->argv, (args->argc + 2) * sizeof(char *));
58 newarg = newargv ? strdup(arg) : NULL;
59 if (!newargv || !newarg)
60 return alloc_failed();
61
62 args->argv = newargv;
63 args->allocated = 1;
64 args->argv[args->argc++] = newarg;
65 args->argv[args->argc] = NULL;
66 return 0;
67}
68
69int fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
70{
71 assert(pos <= args->argc);
72 if (fuse_opt_add_arg(args, arg) == -1)
73 return -1;
74
75 if (pos != args->argc - 1) {
76 char *newarg = args->argv[args->argc - 1];
77 memmove(&args->argv[pos + 1], &args->argv[pos],
78 sizeof(char *) * (args->argc - pos - 1));
79 args->argv[pos] = newarg;
80 }
81 return 0;
82}
83
84static int next_arg(struct fuse_opt_context *ctx, const char *opt)
85{
86 if (ctx->argctr + 1 >= ctx->argc) {
87 fprintf(stderr, "fuse: missing argument after `%s'\n", opt);
88 return -1;
89 }
90 ctx->argctr++;
91 return 0;
92}
93
94static int add_arg(struct fuse_opt_context *ctx, const char *arg)
95{
96 return fuse_opt_add_arg(&ctx->outargs, arg);
97}
98
99int fuse_opt_add_opt(char **opts, const char *opt)
100{
101 char *newopts;
102 if (!*opts)
103 newopts = strdup(opt);
104 else {
105 unsigned oldlen = strlen(*opts);
106 newopts = realloc(*opts, oldlen + 1 + strlen(opt) + 1);
107 if (newopts) {
108 newopts[oldlen] = ',';
109 strcpy(newopts + oldlen + 1, opt);
110 }
111 }
112 if (!newopts)
113 return alloc_failed();
114
115 *opts = newopts;
116 return 0;
117}
118
119static int add_opt(struct fuse_opt_context *ctx, const char *opt)
120{
121 return fuse_opt_add_opt(&ctx->opts, opt);
122}
123
124static int call_proc(struct fuse_opt_context *ctx, const char *arg, int key,
125 int iso)
126{
127 if (key == FUSE_OPT_KEY_DISCARD)
128 return 0;
129
130 if (key != FUSE_OPT_KEY_KEEP && ctx->proc) {
131 int res = ctx->proc(ctx->data, arg, key, &ctx->outargs);
132 if (res == -1 || !res)
133 return res;
134 }
135 if (iso)
136 return add_opt(ctx, arg);
137 else
138 return add_arg(ctx, arg);
139}
140
141static int match_template(const char *t, const char *arg, unsigned *sepp)
142{
143 int arglen = strlen(arg);
144 const char *sep = strchr(t, '=');
145 sep = sep ? sep : strchr(t, ' ');
146 if (sep && (!sep[1] || sep[1] == '%')) {
147 int tlen = sep - t;
148 if (sep[0] == '=')
149 tlen ++;
150 if (arglen >= tlen && strncmp(arg, t, tlen) == 0) {
151 *sepp = sep - t;
152 return 1;
153 }
154 }
155 if (strcmp(t, arg) == 0) {
156 *sepp = 0;
157 return 1;
158 }
159 return 0;
160}
161
162static const struct fuse_opt *find_opt(const struct fuse_opt *opt,
163 const char *arg, unsigned *sepp)
164{
165 for (; opt && opt->templ; opt++)
166 if (match_template(opt->templ, arg, sepp))
167 return opt;
168 return NULL;
169}
170
171int fuse_opt_match(const struct fuse_opt *opts, const char *opt)
172{
173 unsigned dummy;
174 return find_opt(opts, opt, &dummy) ? 1 : 0;
175}
176
177static int process_opt_param(void *var, const char *format, const char *param,
178 const char *arg)
179{
180 assert(format[0] == '%');
181 if (format[1] == 's') {
182 char *copy = strdup(param);
183 if (!copy)
184 return alloc_failed();
185
186 *(char **) var = copy;
187 } else {
188 if (sscanf(param, format, var) != 1) {
189 fprintf(stderr, "fuse: invalid parameter in option `%s'\n", arg);
190 return -1;
191 }
192 }
193 return 0;
194}
195
196static int process_opt(struct fuse_opt_context *ctx,
197 const struct fuse_opt *opt, unsigned sep,
198 const char *arg, int iso)
199{
200 if (opt->offset == -1U) {
201 if (call_proc(ctx, arg, opt->value, iso) == -1)
202 return -1;
203 } else {
204 void *var = (char *)ctx->data + opt->offset;
205 if (sep && opt->templ[sep + 1]) {
206 const char *param = arg + sep;
207 if (opt->templ[sep] == '=')
208 param ++;
209 if (process_opt_param(var, opt->templ + sep + 1,
210 param, arg) == -1)
211 return -1;
212 } else
213 *(int *)var = opt->value;
214 }
215 return 0;
216}
217
218static int process_opt_sep_arg(struct fuse_opt_context *ctx,
219 const struct fuse_opt *opt, unsigned sep,
220 const char *arg, int iso)
221{
222 int res;
223 char *newarg;
224 char *param;
225
226 if (next_arg(ctx, arg) == -1)
227 return -1;
228
229 param = ctx->argv[ctx->argctr];
230 newarg = malloc(sep + strlen(param) + 1);
231 if (!newarg)
232 return alloc_failed();
233
234 memcpy(newarg, arg, sep);
235 strcpy(newarg + sep, param);
236 res = process_opt(ctx, opt, sep, newarg, iso);
237 free(newarg);
238
239 return res;
240}
241
242static int process_gopt(struct fuse_opt_context *ctx, const char *arg, int iso)
243{
244 unsigned sep;
245 const struct fuse_opt *opt = find_opt(ctx->opt, arg, &sep);
246 if (opt) {
247 for (; opt; opt = find_opt(opt + 1, arg, &sep)) {
248 int res;
249 if (sep && opt->templ[sep] == ' ' && !arg[sep])
250 res = process_opt_sep_arg(ctx, opt, sep, arg, iso);
251 else
252 res = process_opt(ctx, opt, sep, arg, iso);
253 if (res == -1)
254 return -1;
255 }
256 return 0;
257 } else
258 return call_proc(ctx, arg, FUSE_OPT_KEY_OPT, iso);
259}
260
261static int process_real_option_group(struct fuse_opt_context *ctx, char *opts)
262{
263 char *sep;
264
265 do {
266 int res;
267 sep = strchr(opts, ',');
268 if (sep)
269 *sep = '\0';
270 res = process_gopt(ctx, opts, 1);
271 if (res == -1)
272 return -1;
273 opts = sep + 1;
274 } while (sep);
275
276 return 0;
277}
278
279static int process_option_group(struct fuse_opt_context *ctx, const char *opts)
280{
281 int res;
282 char *copy;
283 const char *sep = strchr(opts, ',');
284 if (!sep)
285 return process_gopt(ctx, opts, 1);
286
287 copy = strdup(opts);
288 if (!copy) {
289 fprintf(stderr, "fuse: memory allocation failed\n");
290 return -1;
291 }
292 res = process_real_option_group(ctx, copy);
293 free(copy);
294 return res;
295}
296
297static int process_one(struct fuse_opt_context *ctx, const char *arg)
298{
299 if (ctx->nonopt || arg[0] != '-')
300 return call_proc(ctx, arg, FUSE_OPT_KEY_NONOPT, 0);
301 else if (arg[1] == 'o') {
302 if (arg[2])
303 return process_option_group(ctx, arg + 2);
304 else {
305 if (next_arg(ctx, arg) == -1)
306 return -1;
307
308 return process_option_group(ctx, ctx->argv[ctx->argctr]);
309 }
310 } else if (arg[1] == '-' && !arg[2]) {
311 if (add_arg(ctx, arg) == -1)
312 return -1;
313 ctx->nonopt = ctx->outargs.argc;
314 return 0;
315 } else
316 return process_gopt(ctx, arg, 0);
317}
318
319static int opt_parse(struct fuse_opt_context *ctx)
320{
321 if (ctx->argc) {
322 if (add_arg(ctx, ctx->argv[0]) == -1)
323 return -1;
324 }
325
326 for (ctx->argctr = 1; ctx->argctr < ctx->argc; ctx->argctr++)
327 if (process_one(ctx, ctx->argv[ctx->argctr]) == -1)
328 return -1;
329
330 if (ctx->opts) {
331 if (fuse_opt_insert_arg(&ctx->outargs, 1, "-o") == -1 ||
332 fuse_opt_insert_arg(&ctx->outargs, 2, ctx->opts) == -1)
333 return -1;
334 }
335 if (ctx->nonopt && ctx->nonopt == ctx->outargs.argc) {
336 free(ctx->outargs.argv[ctx->outargs.argc - 1]);
337 ctx->outargs.argv[--ctx->outargs.argc] = NULL;
338 }
339
340 return 0;
341}
342
343int fuse_opt_parse(struct fuse_args *args, void *data,
344 const struct fuse_opt opts[], fuse_opt_proc_t proc)
345{
346 int res;
347 struct fuse_opt_context ctx = {
348 .data = data,
349 .opt = opts,
350 .proc = proc,
351 };
352
353 if (!args || !args->argv || !args->argc)
354 return 0;
355
356 ctx.argc = args->argc;
357 ctx.argv = args->argv;
358
359 res = opt_parse(&ctx);
360 if (res != -1) {
361 struct fuse_args tmp = *args;
362 *args = ctx.outargs;
363 ctx.outargs = tmp;
364 }
365 free(ctx.opts);
366 fuse_opt_free_args(&ctx.outargs);
367 return res;
368}
369
generated by cgit at 2024-05-19 07:04:04 (GMT)