pulseaudio/src/pulsecore/modargs.c

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include <pulse/xmalloc.h>

#include <pulsecore/hashmap.h>
#include <pulsecore/idxset.h>
#include <pulsecore/sample-util.h>
#include <pulsecore/namereg.h>
#include <pulsecore/sink.h>
#include <pulsecore/source.h>
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>

#include "modargs.h"

struct entry {
    char *key, *value;
};

static int add_key_value(pa_hashmap *map, char *key, char *value, const char* const valid_keys[]) {
    struct entry *e;

    pa_assert(map);
    pa_assert(key);
    pa_assert(value);

    if (pa_hashmap_get(map, key)) {
        pa_xfree(key);
        pa_xfree(value);
        return -1;
    }

    if (valid_keys) {
        const char*const* v;
        for (v = valid_keys; *v; v++)
            if (strcmp(*v, key) == 0)
                break;

        if (!*v) {
            pa_xfree(key);
            pa_xfree(value);
            return -1;
        }
    }

    e = pa_xnew(struct entry, 1);
    e->key = key;
    e->value = value;
    pa_hashmap_put(map, key, e);

    return 0;
}

pa_modargs *pa_modargs_new(const char *args, const char* const* valid_keys) {
    pa_hashmap *map = NULL;

    map = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);

    if (args) {
        enum {
            WHITESPACE,
            KEY,
            VALUE_START,
            VALUE_SIMPLE,
            VALUE_DOUBLE_QUOTES,
            VALUE_TICKS
        } state;

        const char *p, *key, *value;
        size_t key_len = 0, value_len = 0;

        key = value = NULL;
        state = WHITESPACE;
        for (p = args; *p; p++) {
            switch (state) {
                case WHITESPACE:
                    if (*p == '=')
                        goto fail;
                    else if (!isspace(*p)) {
                        key = p;
                        state = KEY;
                        key_len = 1;
                    }
                    break;
                case KEY:
                    if (*p == '=')
                        state = VALUE_START;
                    else if (isspace(*p))
                        goto fail;
                    else
                        key_len++;
                    break;
                case  VALUE_START:
                    if (*p == '\'') {
                        state = VALUE_TICKS;
                        value = p+1;
                        value_len = 0;
                    } else if (*p == '"') {
                        state = VALUE_DOUBLE_QUOTES;
                        value = p+1;
                        value_len = 0;
                    } else if (isspace(*p)) {
                        if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrdup(""), valid_keys) < 0)
                            goto fail;
                        state = WHITESPACE;
                    } else {
                        state = VALUE_SIMPLE;
                        value = p;
                        value_len = 1;
                    }
                    break;
                case VALUE_SIMPLE:
                    if (isspace(*p)) {
                        if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrndup(value, value_len), valid_keys) < 0)
                            goto fail;
                        state = WHITESPACE;
                    } else
                        value_len++;
                    break;
                case VALUE_DOUBLE_QUOTES:
                    if (*p == '"') {
                        if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrndup(value, value_len), valid_keys) < 0)
                            goto fail;
                        state = WHITESPACE;
                    } else
                        value_len++;
                    break;
                case VALUE_TICKS:
                    if (*p == '\'') {
                        if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrndup(value, value_len), valid_keys) < 0)
                            goto fail;
                        state = WHITESPACE;
                    } else
                        value_len++;
                    break;
            }
        }

        if (state == VALUE_START) {
            if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrdup(""), valid_keys) < 0)
                goto fail;
        } else if (state == VALUE_SIMPLE) {
            if (add_key_value(map, pa_xstrndup(key, key_len), pa_xstrdup(value), valid_keys) < 0)
                goto fail;
        } else if (state != WHITESPACE)
            goto fail;
    }

    return (pa_modargs*) map;

fail:

    if (map)
        pa_modargs_free((pa_modargs*) map);

    return NULL;
}

static void free_func(void *p, PA_GCC_UNUSED void*userdata) {
    struct entry *e = p;
    pa_assert(e);

    pa_xfree(e->key);
    pa_xfree(e->value);
    pa_xfree(e);
}

void pa_modargs_free(pa_modargs*ma) {
    pa_hashmap *map = (pa_hashmap*) ma;
    pa_hashmap_free(map, free_func, NULL);
}

const char *pa_modargs_get_value(pa_modargs *ma, const char *key, const char *def) {
    pa_hashmap *map = (pa_hashmap*) ma;
    struct entry*e;

    if (!(e = pa_hashmap_get(map, key)))
        return def;

    return e->value;
}

int pa_modargs_get_value_u32(pa_modargs *ma, const char *key, uint32_t *value) {
    const char *v;

    pa_assert(ma);
    pa_assert(key);
    pa_assert(value);

    if (!(v = pa_modargs_get_value(ma, key, NULL)))
        return 0;

    if (pa_atou(v, value) < 0)
        return -1;

    return 0;
}

int pa_modargs_get_value_s32(pa_modargs *ma, const char *key, int32_t *value) {
    const char *v;

    pa_assert(ma);
    pa_assert(key);
    pa_assert(value);

    if (!(v = pa_modargs_get_value(ma, key, NULL)))
        return 0;

    if (pa_atoi(v, value) < 0)
        return -1;

    return 0;
}

int pa_modargs_get_value_boolean(pa_modargs *ma, const char *key, pa_bool_t *value) {
    const char *v;
    int r;

    pa_assert(ma);
    pa_assert(key);
    pa_assert(value);

    if (!(v = pa_modargs_get_value(ma, key, NULL)))
        return 0;

    if (!*v)
        return -1;

    if ((r = pa_parse_boolean(v)) < 0)
        return -1;

    *value = r;
    return 0;
}

int pa_modargs_get_sample_spec(pa_modargs *ma, pa_sample_spec *rss) {
    const char *format;
    uint32_t channels;
    pa_sample_spec ss;

    pa_assert(ma);
    pa_assert(rss);

    ss = *rss;
    if ((pa_modargs_get_value_u32(ma, "rate", &ss.rate)) < 0)
        return -1;

    channels = ss.channels;
    if ((pa_modargs_get_value_u32(ma, "channels", &channels)) < 0)
        return -1;
    ss.channels = (uint8_t) channels;

    if ((format = pa_modargs_get_value(ma, "format", NULL)))
        if ((ss.format = pa_parse_sample_format(format)) < 0)
            return -1;

    if (!pa_sample_spec_valid(&ss))
        return -1;

    *rss = ss;

    return 0;
}

int pa_modargs_get_channel_map(pa_modargs *ma, const char *name, pa_channel_map *rmap) {
    pa_channel_map map;
    const char *cm;

    pa_assert(ma);
    pa_assert(rmap);

    map = *rmap;

    if ((cm = pa_modargs_get_value(ma, name ? name : "channel_map", NULL)))
        if (!pa_channel_map_parse(&map, cm))
            return -1;

    if (!pa_channel_map_valid(&map))
        return -1;

    *rmap = map;
    return 0;
}

int pa_modargs_get_sample_spec_and_channel_map(pa_modargs *ma, pa_sample_spec *rss, pa_channel_map *rmap, pa_channel_map_def_t def) {
    pa_sample_spec ss;
    pa_channel_map map;

    pa_assert(ma);
    pa_assert(rss);
    pa_assert(rmap);

    ss = *rss;

    if (pa_modargs_get_sample_spec(ma, &ss) < 0)
        return -1;

    pa_channel_map_init_extend(&map, ss.channels, def);

    if (pa_modargs_get_channel_map(ma, NULL, &map) < 0)
        return -1;

    if (map.channels != ss.channels)
        return -1;

    *rmap = map;
    *rss = ss;

    return 0;
}