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-rw-r--r--fuse/fuse_opt.c409
1 files changed, 409 insertions, 0 deletions
diff --git a/fuse/fuse_opt.c b/fuse/fuse_opt.c
new file mode 100644
index 000000000..b15e7db11
--- /dev/null
+++ b/fuse/fuse_opt.c
@@ -0,0 +1,409 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB
+*/
+
+#include "fuse_opt.h"
+#include "fuse_misc.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;
+ struct fuse_args outargs;
+ char *opts;
+ int nonopt;
+};
+
+void fuse_opt_free_args(struct fuse_args *args)
+{
+ if (args) {
+ if (args->argv && args->allocated) {
+ int i;
+ for (i = 0; i < args->argc; i++)
+ free(args->argv[i]);
+ free(args->argv);
+ }
+ args->argc = 0;
+ args->argv = NULL;
+ args->allocated = 0;
+ }
+}
+
+static int alloc_failed(void)
+{
+ fprintf(stderr, "fuse: memory allocation failed\n");
+ return -1;
+}
+
+int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
+{
+ char **newargv;
+ char *newarg;
+
+ assert(!args->argv || args->allocated);
+
+ newargv = realloc(args->argv, (args->argc + 2) * sizeof(char *));
+ newarg = newargv ? strdup(arg) : NULL;
+ if (!newargv || !newarg)
+ return alloc_failed();
+
+ args->argv = newargv;
+ args->allocated = 1;
+ args->argv[args->argc++] = newarg;
+ args->argv[args->argc] = NULL;
+ return 0;
+}
+
+static int fuse_opt_insert_arg_common(struct fuse_args *args, int pos,
+ const char *arg)
+{
+ assert(pos <= args->argc);
+ if (fuse_opt_add_arg(args, arg) == -1)
+ return -1;
+
+ if (pos != args->argc - 1) {
+ char *newarg = args->argv[args->argc - 1];
+ memmove(&args->argv[pos + 1], &args->argv[pos],
+ sizeof(char *) * (args->argc - pos - 1));
+ args->argv[pos] = newarg;
+ }
+ return 0;
+}
+
+int fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
+{
+ return fuse_opt_insert_arg_common(args, pos, arg);
+}
+
+int fuse_opt_insert_arg_compat(struct fuse_args *args, int pos,
+ const char *arg);
+int fuse_opt_insert_arg_compat(struct fuse_args *args, int pos, const char *arg)
+{
+ return fuse_opt_insert_arg_common(args, pos, arg);
+}
+
+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->outargs, arg);
+}
+
+static int add_opt_common(char **opts, const char *opt, int esc)
+{
+ unsigned oldlen = *opts ? strlen(*opts) : 0;
+ char *d = realloc(*opts, oldlen + 1 + strlen(opt) * 2 + 1);
+
+ if (!d)
+ return alloc_failed();
+
+ *opts = d;
+ if (oldlen) {
+ d += oldlen;
+ *d++ = ',';
+ }
+
+ for (; *opt; opt++) {
+ if (esc && (*opt == ',' || *opt == '\\'))
+ *d++ = '\\';
+ *d++ = *opt;
+ }
+ *d = '\0';
+
+ return 0;
+}
+
+int fuse_opt_add_opt(char **opts, const char *opt)
+{
+ return add_opt_common(opts, opt, 0);
+}
+
+int fuse_opt_add_opt_escaped(char **opts, const char *opt)
+{
+ return add_opt_common(opts, opt, 1);
+}
+
+static int add_opt(struct fuse_opt_context *ctx, const char *opt)
+{
+ return add_opt_common(&ctx->opts, opt, 1);
+}
+
+static int call_proc(struct fuse_opt_context *ctx, const char *arg, int key,
+ int iso)
+{
+ if (key == FUSE_OPT_KEY_DISCARD)
+ return 0;
+
+ if (key != FUSE_OPT_KEY_KEEP && ctx->proc) {
+ int res = ctx->proc(ctx->data, arg, key, &ctx->outargs);
+ 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->templ; opt++)
+ if (match_template(opt->templ, 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 == -1U) {
+ if (call_proc(ctx, arg, opt->value, iso) == -1)
+ return -1;
+ } else {
+ void *var = ctx->data + opt->offset;
+ if (sep && opt->templ[sep + 1]) {
+ const char *param = arg + sep;
+ if (opt->templ[sep] == '=')
+ param ++;
+ if (process_opt_param(var, opt->templ + 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->templ[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 *s = opts;
+ char *d = s;
+ int end = 0;
+
+ while (!end) {
+ if (*s == '\0')
+ end = 1;
+ if (*s == ',' || end) {
+ int res;
+
+ *d = '\0';
+ res = process_gopt(ctx, opts, 1);
+ if (res == -1)
+ return -1;
+ d = opts;
+ } else {
+ if (s[0] == '\\' && s[1] != '\0')
+ s++;
+ *d++ = *s;
+ }
+ s++;
+ }
+
+ return 0;
+}
+
+static int process_option_group(struct fuse_opt_context *ctx, const char *opts)
+{
+ int res;
+ char *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->outargs.argc;
+ 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 (fuse_opt_insert_arg(&ctx->outargs, 1, "-o") == -1 ||
+ fuse_opt_insert_arg(&ctx->outargs, 2, ctx->opts) == -1)
+ return -1;
+ }
+
+ /* If option separator ("--") is the last argument, remove it */
+ if (ctx->nonopt && ctx->nonopt == ctx->outargs.argc &&
+ strcmp(ctx->outargs.argv[ctx->outargs.argc - 1], "--") == 0) {
+ free(ctx->outargs.argv[ctx->outargs.argc - 1]);
+ ctx->outargs.argv[--ctx->outargs.argc] = NULL;
+ }
+
+ return 0;
+}
+
+int fuse_opt_parse(struct fuse_args *args, void *data,
+ const struct fuse_opt opts[], fuse_opt_proc_t proc)
+{
+ int res;
+ struct fuse_opt_context ctx = {
+ .data = data,
+ .opt = opts,
+ .proc = proc,
+ };
+
+ if (!args || !args->argv || !args->argc)
+ return 0;
+
+ ctx.argc = args->argc;
+ ctx.argv = args->argv;
+
+ res = opt_parse(&ctx);
+ if (res != -1) {
+ struct fuse_args tmp = *args;
+ *args = ctx.outargs;
+ ctx.outargs = tmp;
+ }
+ free(ctx.opts);
+ fuse_opt_free_args(&ctx.outargs);
+ return res;
+}
+
+/* This symbol version was mistakenly added to the version script */
+FUSE_SYMVER(".symver fuse_opt_insert_arg_compat,fuse_opt_insert_arg@FUSE_2.5");
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