rockbox/apps/plugins/puzzles/rbmalloc.c

/*
 * malloc.c: safe wrappers around malloc, realloc, free, strdup
 */

#include <stdlib.h>
#include <string.h>
#include "src/puzzles.h"

/*
 * smalloc should guarantee to return a useful pointer - Halibut
 * can do nothing except die when it's out of memory anyway.
 */

int allocs = 0;
int frees = 0;

bool audiobuf_available =
#ifndef COMBINED
    true;
#else
    false;
#endif

static bool grab_audiobuf(void)
{
    if(!audiobuf_available)
        return false;

    if(rb->audio_status())
        rb->audio_stop();

    size_t sz, junk;
    void *audiobuf = rb->plugin_get_audio_buffer(&sz);
    extern char *giant_buffer;

    add_new_area(audiobuf, sz, giant_buffer);
    audiobuf_available = false;
    return true;
}

void *smalloc(size_t size) {
    void *p;
    p = malloc(size);
    LOGF("allocs: %d", ++allocs);
    if (!p)
    {
        if(grab_audiobuf())
            return smalloc(size);
        fatal("out of memory");
    }
    return p;
}

/*
 * sfree should guaranteeably deal gracefully with freeing NULL
 */
void sfree(void *p) {
    if (p) {
        ++frees;
        LOGF("frees: %d, total outstanding: %d", frees, allocs - frees);
        free(p);
    }
}

/*
 * srealloc should guaranteeably be able to realloc NULL
 */
void *srealloc(void *p, size_t size) {
    void *q;
    if (p) {
	q = realloc(p, size);
    } else {
        LOGF("allocs: %d", ++allocs);
	q = malloc(size);
    }
    if (!q)
    {
        if(grab_audiobuf())
            return srealloc(p, size);
        fatal("out of memory");
    }
    return q;
}

/*
 * dupstr is like strdup, but with the never-return-NULL property
 * of smalloc (and also reliably defined in all environments :-)
 */
char *dupstr(const char *s) {
    char *r = smalloc(1+strlen(s));
    strcpy(r,s);
    return r;
}