nice c codes

goto_err.c

//took from: https://github.com/reagent/buffer

#define jump_to_error_if(A) if (A) { goto error; }
#define jump_to_error_unless(A) if (!(A)) { goto error; }

Buffer *
buffer_alloc(int initial_size)
{
    Buffer *buf = malloc(sizeof(Buffer));
    char   *tmp = calloc(1, initial_size * sizeof(char));

    jump_to_error_if(buf == NULL || tmp == NULL);

    buf->contents   = tmp;
    buf->bytes_used = 0;
    buf->total_size = initial_size;

    return buf;
error:
    if (buf) { buffer_free(buf); }
    if (tmp) { free(tmp); }

    return NULL;
}