| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> |
| |
| This program can be distributed under the terms of the GNU LGPL. |
| See the file COPYING.LIB |
| */ |
| |
| #include "fuse_opt.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <assert.h> |
| |
| struct fuse_opt_context { |
| void *data; |
| const struct fuse_opt *opt; |
| fuse_opt_proc_t proc; |
| int argctr; |
| int argc; |
| char **argv; |
| int argcout; |
| char **argvout; |
| char *opts; |
| int nonopt; |
| }; |
| |
| void fuse_opt_free_args(char *args[]) |
| { |
| if (args) { |
| int i; |
| for (i = 0; args[i]; i++) |
| free(args[i]); |
| free(args); |
| } |
| } |
| |
| static int alloc_failed(void) |
| { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| return -1; |
| } |
| |
| int fuse_opt_add_arg(int *argcp, char **argvp[], const char *arg) |
| { |
| char **newargv = realloc(*argvp, (*argcp + 2) * sizeof(char *)); |
| char *newarg = newargv ? strdup(arg) : NULL; |
| if (!newargv || !newarg) |
| return alloc_failed(); |
| |
| newargv[(*argcp)++] = newarg; |
| newargv[*argcp] = NULL; |
| *argvp = newargv; |
| return 0; |
| } |
| |
| static int next_arg(struct fuse_opt_context *ctx, const char *opt) |
| { |
| if (ctx->argctr + 1 >= ctx->argc) { |
| fprintf(stderr, "fuse: missing argument after `%s'\n", opt); |
| return -1; |
| } |
| ctx->argctr++; |
| return 0; |
| } |
| |
| static int add_arg(struct fuse_opt_context *ctx, const char *arg) |
| { |
| return fuse_opt_add_arg(&ctx->argcout, &ctx->argvout, arg); |
| } |
| |
| int fuse_opt_add_opt(char **opts, const char *opt) |
| { |
| char *newopts; |
| if (!*opts) |
| newopts = strdup(opt); |
| else { |
| unsigned oldlen = strlen(*opts); |
| newopts = realloc(*opts, oldlen + 1 + strlen(opt) + 1); |
| if (newopts) { |
| newopts[oldlen] = ','; |
| strcpy(newopts + oldlen + 1, opt); |
| } |
| } |
| if (!newopts) |
| return alloc_failed(); |
| |
| *opts = newopts; |
| return 0; |
| } |
| |
| static int add_opt(struct fuse_opt_context *ctx, const char *opt) |
| { |
| return fuse_opt_add_opt(&ctx->opts, opt); |
| } |
| |
| static int insert_arg(struct fuse_opt_context *ctx, int pos, const char *arg) |
| { |
| assert(pos <= ctx->argcout); |
| if (add_arg(ctx, arg) == -1) |
| return -1; |
| |
| if (pos != ctx->argcout - 1) { |
| char *newarg = ctx->argvout[ctx->argcout - 1]; |
| memmove(&ctx->argvout[pos + 1], &ctx->argvout[pos], |
| sizeof(char *) * (ctx->argcout - pos - 1)); |
| ctx->argvout[pos] = newarg; |
| } |
| return 0; |
| } |
| |
| static int call_proc(struct fuse_opt_context *ctx, const char *arg, int key, |
| int iso) |
| { |
| if (ctx->proc) { |
| int res = ctx->proc(ctx->data, arg, key, &ctx->argcout, &ctx->argvout); |
| if (res == -1 || !res) |
| return res; |
| } |
| if (iso) |
| return add_opt(ctx, arg); |
| else |
| return add_arg(ctx, arg); |
| } |
| |
| static int match_template(const char *t, const char *arg, unsigned *sepp) |
| { |
| int arglen = strlen(arg); |
| const char *sep = strchr(t, '='); |
| sep = sep ? sep : strchr(t, ' '); |
| if (sep && (!sep[1] || sep[1] == '%')) { |
| int tlen = sep - t; |
| if (sep[0] == '=') |
| tlen ++; |
| if (arglen >= tlen && strncmp(arg, t, tlen) == 0) { |
| *sepp = sep - t; |
| return 1; |
| } |
| } |
| if (strcmp(t, arg) == 0) { |
| *sepp = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static const struct fuse_opt *find_opt(const struct fuse_opt *opt, |
| const char *arg, unsigned *sepp) |
| { |
| for (; opt && opt->template; opt++) |
| if (match_template(opt->template, arg, sepp)) |
| return opt; |
| return NULL; |
| } |
| |
| int fuse_opt_match(const struct fuse_opt *opts, const char *opt) |
| { |
| unsigned dummy; |
| return find_opt(opts, opt, &dummy) ? 1 : 0; |
| } |
| |
| static int process_opt_param(void *var, const char *format, const char *param, |
| const char *arg) |
| { |
| assert(format[0] == '%'); |
| if (format[1] == 's') { |
| char *copy = strdup(param); |
| if (!copy) |
| return alloc_failed(); |
| |
| *(char **) var = copy; |
| } else { |
| if (sscanf(param, format, var) != 1) { |
| fprintf(stderr, "fuse: invalid parameter in option `%s'\n", arg); |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| static int process_opt(struct fuse_opt_context *ctx, |
| const struct fuse_opt *opt, unsigned sep, |
| const char *arg, int iso) |
| { |
| if (opt->offset == FUSE_OPT_OFFSET_KEY) { |
| if (call_proc(ctx, arg, opt->value, iso) == -1) |
| return -1; |
| } else { |
| void *var = ctx->data + opt->offset; |
| if (sep && opt->template[sep + 1]) { |
| const char *param = arg + sep; |
| if (opt->template[sep] == '=') |
| param ++; |
| if (process_opt_param(var, opt->template + sep + 1, |
| param, arg) == -1) |
| return -1; |
| } else |
| *(int *)var = opt->value; |
| } |
| return 0; |
| } |
| |
| static int process_opt_sep_arg(struct fuse_opt_context *ctx, |
| const struct fuse_opt *opt, unsigned sep, |
| const char *arg, int iso) |
| { |
| int res; |
| char *newarg; |
| char *param; |
| |
| if (next_arg(ctx, arg) == -1) |
| return -1; |
| |
| param = ctx->argv[ctx->argctr]; |
| newarg = malloc(sep + strlen(param) + 1); |
| if (!newarg) |
| return alloc_failed(); |
| |
| memcpy(newarg, arg, sep); |
| strcpy(newarg + sep, param); |
| res = process_opt(ctx, opt, sep, newarg, iso); |
| free(newarg); |
| |
| return res; |
| } |
| |
| static int process_gopt(struct fuse_opt_context *ctx, const char *arg, int iso) |
| { |
| unsigned sep; |
| const struct fuse_opt *opt = find_opt(ctx->opt, arg, &sep); |
| if (opt) { |
| for (; opt; opt = find_opt(opt + 1, arg, &sep)) { |
| int res; |
| if (sep && opt->template[sep] == ' ' && !arg[sep]) |
| res = process_opt_sep_arg(ctx, opt, sep, arg, iso); |
| else |
| res = process_opt(ctx, opt, sep, arg, iso); |
| if (res == -1) |
| return -1; |
| } |
| return 0; |
| } else |
| return call_proc(ctx, arg, FUSE_OPT_KEY_OPT, iso); |
| } |
| |
| static int process_real_option_group(struct fuse_opt_context *ctx, char *opts) |
| { |
| char *sep; |
| |
| do { |
| int res; |
| sep = strchr(opts, ','); |
| if (sep) |
| *sep = '\0'; |
| res = process_gopt(ctx, opts, 1); |
| if (res == -1) |
| return -1; |
| opts = sep + 1; |
| } while (sep); |
| |
| return 0; |
| } |
| |
| static int process_option_group(struct fuse_opt_context *ctx, const char *opts) |
| { |
| int res; |
| char *copy; |
| const char *sep = strchr(opts, ','); |
| if (!sep) |
| return process_gopt(ctx, opts, 1); |
| |
| copy = strdup(opts); |
| if (!copy) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| return -1; |
| } |
| res = process_real_option_group(ctx, copy); |
| free(copy); |
| return res; |
| } |
| |
| static int process_one(struct fuse_opt_context *ctx, const char *arg) |
| { |
| if (ctx->nonopt || arg[0] != '-') |
| return call_proc(ctx, arg, FUSE_OPT_KEY_NONOPT, 0); |
| else if (arg[1] == 'o') { |
| if (arg[2]) |
| return process_option_group(ctx, arg + 2); |
| else { |
| if (next_arg(ctx, arg) == -1) |
| return -1; |
| |
| return process_option_group(ctx, ctx->argv[ctx->argctr]); |
| } |
| } else if (arg[1] == '-' && !arg[2]) { |
| if (add_arg(ctx, arg) == -1) |
| return -1; |
| ctx->nonopt = ctx->argcout; |
| return 0; |
| } else |
| return process_gopt(ctx, arg, 0); |
| } |
| |
| static int opt_parse(struct fuse_opt_context *ctx) |
| { |
| if (ctx->argc) { |
| if (add_arg(ctx, ctx->argv[0]) == -1) |
| return -1; |
| } |
| |
| for (ctx->argctr = 1; ctx->argctr < ctx->argc; ctx->argctr++) |
| if (process_one(ctx, ctx->argv[ctx->argctr]) == -1) |
| return -1; |
| |
| if (ctx->opts) { |
| if (insert_arg(ctx, 1, "-o") == -1 || |
| insert_arg(ctx, 2, ctx->opts) == -1) |
| return -1; |
| } |
| if (ctx->nonopt && ctx->nonopt == ctx->argcout) |
| ctx->argvout[--ctx->argcout] = NULL; |
| |
| return 0; |
| } |
| |
| int fuse_opt_parse(int argc, char *argv[], void *data, |
| const struct fuse_opt opts[], fuse_opt_proc_t proc, |
| int *argcout, char **argvout[]) |
| { |
| int res; |
| struct fuse_opt_context ctx = { |
| .argc = argv ? argc : *argcout, |
| .argv = argv ? argv : *argvout, |
| .data = data, |
| .opt = opts, |
| .proc = proc, |
| .argcout = 0, |
| .argvout = NULL, |
| .opts = NULL, |
| .nonopt = 0, |
| }; |
| |
| res = opt_parse(&ctx); |
| if (!argv) |
| fuse_opt_free_args(ctx.argv); |
| free(ctx.opts); |
| if (res == -1) |
| fuse_opt_free_args(ctx.argvout); |
| else { |
| if (argcout) |
| *argcout = ctx.argcout; |
| if (argvout) |
| *argvout = ctx.argvout; |
| else |
| fuse_opt_free_args(ctx.argvout); |
| } |
| return res; |
| } |