Initial revision

compat/fuse_opt.c

@@ -0,0 +1,359 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001-2006  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;
+    struct fuse_args outargs;
+    char *opts;
+    int nonopt;
+};
+
+void fuse_opt_free_args(struct fuse_args *args)
+{
+    if (args && args->argv && args->allocated) {
+        int i;
+        for (i = 0; i < args->argc; i++)
+            free(args->argv[i]);
+        free(args->argv);
+        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 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);
+}
+
+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->outargs.argc);
+    if (add_arg(ctx, arg) == -1)
+        return -1;
+
+    if (pos != ctx->outargs.argc - 1) {
+        char *newarg = ctx->outargs.argv[ctx->outargs.argc - 1];
+        memmove(&ctx->outargs.argv[pos + 1], &ctx->outargs.argv[pos],
+                sizeof(char *) * (ctx->outargs.argc - pos - 1));
+        ctx->outargs.argv[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->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->template_opt; opt++)
+        if (match_template(opt->template_opt, 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->template_opt[sep + 1]) {
+            const char *param = arg + sep;
+            if (opt->template_opt[sep] == '=')
+                param ++;
+            if (process_opt_param(var, opt->template_opt + 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_opt[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->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 (insert_arg(ctx, 1, "-o") == -1 ||
+            insert_arg(ctx, 2, ctx->opts) == -1)
+            return -1;
+    }
+    if (ctx->nonopt && ctx->nonopt == ctx->outargs.argc)
+        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;
+}

compat/fuse_opt.h

@@ -0,0 +1,227 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#ifndef _FUSE_OPT_H_
+#define _FUSE_OPT_H_
+
+/* This file defines the option parsing interface of FUSE */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Option description
+ *
+ * This structure describes a single option, and and action associated
+ * with it, in case it matches.
+ *
+ * More than one such match may occur, in which case the action for
+ * each match is executed.
+ *
+ * There are three possible actions in case of a match:
+ *
+ * i) An integer (int or unsigned) variable determined by 'offset' is
+ *    set to 'value'
+ *
+ * ii) The processing function is called, with 'value' as the key
+ *
+ * iii) An integer (any) or string (char *) variable determined by
+ *    'offset' is set to the value of an option parameter
+ *
+ * 'offset' should normally be either set to
+ *
+ *  - 'offsetof(struct foo, member)'  actions i) and iii)
+ *
+ *  - -1                              action ii)
+ *
+ * The 'offsetof()' macro is defined in the <stddef.h> header.
+ *
+ * The template determines which options match, and also have an
+ * effect on the action.  Normally the action is either i) or ii), but
+ * if a format is present in the template, then action iii) is
+ * performed.
+ *
+ * The types of templates are:
+ *
+ * 1) "-x", "-foo", "--foo", "--foo-bar", etc.  These match only
+ *   themselves.  Invalid values are "--" and anything beginning
+ *   with "-o"
+ *
+ * 2) "foo", "foo-bar", etc.  These match "-ofoo", "-ofoo-bar" or
+ *    the relevant option in a comma separated option list
+ *
+ * 3) "bar=", "--foo=", etc.  These are variations of 1) and 2)
+ *    which have a parameter
+ *
+ * 4) "bar=%s", "--foo=%lu", etc.  Same matching as above but perform
+ *    action iii).
+ *
+ * 5) "-x ", etc.  Matches either "-xparam" or "-x param" as
+ *    two separate arguments
+ *
+ * 6) "-x %s", etc.  Combination of 4) and 5)
+ *
+ * If the format is "%s", memory is allocated for the string unlike
+ * with scanf().
+ */
+struct fuse_opt {
+    /** Matching template and optional parameter formatting */
+    const char *template_opt;
+
+    /**
+     * Offset of variable within 'data' parameter of fuse_opt_parse()
+     * or -1
+     */
+    unsigned long offset;
+
+    /**
+     * Value to set the variable to, or to be passed as 'key' to the
+     * processing function.  Ignored if template a format
+     */
+    int value;
+};
+
+/**
+ * Key option.  In case of a match, the processing function will be
+ * called with the specified key.
+ */
+#define FUSE_OPT_KEY(template_opt, key) { template_opt, -1U, key }
+
+/**
+ * Last option.  An array of 'struct fuse_opt' must end with a NULL
+ * template value
+ */
+#define FUSE_OPT_END { .template_opt = NULL }
+
+/**
+ * Argument list
+ */
+struct fuse_args {
+    /** Argument count */
+    int argc;
+
+    /** Argument vector.  NULL terminated */
+    char **argv;
+
+    /** Is 'argv' allocated? */
+    int allocated;
+};
+
+/**
+ * Initializer for 'struct fuse_args'
+ */
+#define FUSE_ARGS_INIT(argc, argv) { argc, argv, 0 }
+
+/**
+ * Key value passed to the processing function if an option did not
+ * match any templated
+ */
+#define FUSE_OPT_KEY_OPT     -1
+
+/**
+ * Key value passed to the processing function for all non-options
+ *
+ * Non-options are the arguments beginning with a charater other than
+ * '-' or all arguments after the special '--' option
+ */
+#define FUSE_OPT_KEY_NONOPT  -2
+
+/**
+ * Processing function
+ *
+ * This function is called if
+ *    - option did not match any 'struct fuse_opt'
+ *    - argument is a non-option
+ *    - option did match and offset was set to -1
+ *
+ * The 'arg' parameter will always contain the whole argument or
+ * option including the parameter if exists.  A two-argument option
+ * ("-x foo") is always converted to single arguemnt option of the
+ * form "-xfoo" before this function is called.
+ *
+ * Options of the form '-ofoo' are passed to this function without the
+ * '-o' prefix.
+ *
+ * The return value of this function determines whether this argument
+ * is to be inserted into the output argument vector, or discarded.
+ *
+ * @param data is the user data passed to the fuse_opt_parse() function
+ * @param arg is the whole argument or option
+ * @param key determines why the processing function was called
+ * @param outargs the current output argument list
+ * @return -1 on error, 0 if arg is to be discarded, 1 if arg should be kept
+ */
+typedef int (*fuse_opt_proc_t)(void *data, const char *arg, int key,
+                               struct fuse_args *outargs);
+
+/**
+ * Option parsing function
+ *
+ * If 'args' was returned from a previous call to fuse_opt_parse() or
+ * it was constructed from
+ *
+ * A NULL 'args' is equivalent to an empty argument vector
+ *
+ * A NULL 'opts' is equivalent to an 'opts' array containing a single
+ * end marker
+ *
+ * A NULL 'proc' is equivalent to a processing function always
+ * returning '1'
+ *
+ * @param args is the input and output argument list
+ * @param data is the user data
+ * @param opts is the option description array
+ * @param proc is the processing function
+ * @return -1 on error, 0 on success
+ */
+int fuse_opt_parse(struct fuse_args *args, void *data,
+                   const struct fuse_opt opts[], fuse_opt_proc_t proc);
+
+/**
+ * Add an option to a comma separated option list
+ *
+ * @param opts is a pointer to an option list, may point to a NULL value
+ * @param opt is the option to add
+ * @return -1 on allocation error, 0 on success
+ */
+int fuse_opt_add_opt(char **opts, const char *opt);
+
+/**
+ * Add an argument to a NULL terminated argument vector
+ *
+ * @param args is the structure containing the current argument list
+ * @param arg is the new argument to add
+ * @return -1 on allocation error, 0 on success
+ */
+int fuse_opt_add_arg(struct fuse_args *args, const char *arg);
+
+/**
+ * Free the contents of argument list
+ *
+ * The structure itself is not freed
+ *
+ * @param args is the structure containing the argument list
+ */
+void fuse_opt_free_args(struct fuse_args *args);
+
+
+/**
+ * Check if an option matches
+ *
+ * @param opts is the option description array
+ * @param opt is the option to match
+ * @return 1 if a match is found, 0 if not
+ */
+int fuse_opt_match(const struct fuse_opt opts[], const char *opt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FUSE_OPT_H_ */