pulseaudio/polyp/tokenizer.c

/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio 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.
 
  polypaudio 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 polypaudio; 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 <string.h>
#include <assert.h>
#include <stdlib.h>

#include "tokenizer.h"
#include "dynarray.h"
#include "xmalloc.h"
#include "gccmacro.h"

struct pa_tokenizer {
    pa_dynarray *dynarray;
};

static void token_free(void *p, PA_GCC_UNUSED void *userdata) {
    pa_xfree(p);
}

static void parse(pa_dynarray*a, const char *s, unsigned args) {
    int infty = 0;
    const char delimiter[] = " \t\n\r";
    const char *p;
    assert(a && s);

    if (args == 0)
        infty = 1;

    p = s+strspn(s, delimiter);
    while (*p && (infty || args >= 2)) {
        size_t l = strcspn(p, delimiter);
        char *n = pa_xstrndup(p, l);
        pa_dynarray_append(a, n);
        p += l;
        p += strspn(p, delimiter);
        args--;
    }

    if (args && *p) {
        char *n = pa_xstrdup(p);
        pa_dynarray_append(a, n);
    }
}

pa_tokenizer* pa_tokenizer_new(const char *s, unsigned args) {
    pa_tokenizer *t;
    
    t = pa_xmalloc(sizeof(pa_tokenizer));
    t->dynarray = pa_dynarray_new();
    assert(t->dynarray);

    parse(t->dynarray, s, args);
    return t;
}

void pa_tokenizer_free(pa_tokenizer *t) {
    assert(t);
    pa_dynarray_free(t->dynarray, token_free, NULL);
    pa_xfree(t);
}

const char *pa_tokenizer_get(pa_tokenizer *t, unsigned i) {
    assert(t);
    return pa_dynarray_get(t->dynarray, i);
}