Function grab

ccan/ccan/ptr_valid/ptr_valid.c:14–49

#if HAVE_PROC_SELF_MAPS
static char *grab(const char *filename)
{
	int ret, fd;
	size_t max = 16384, s = 0;
	char *buffer;

	fd = open(filename, O_RDONLY);
	if (fd < 0)
		return NULL;

	buffer = malloc(max+1);
	if (!buffer)
		goto close;

	while ((ret = read(fd, buffer + s, max - s)) > 0) {
		s += ret;
		if (s == max) {
			buffer = realloc(buffer, max*2+1);
			if (!buffer)
				goto close;
			max *= 2;
		}
	}
	if (ret < 0)
		goto free;

	close(fd);
	buffer[s] = '\0';
	return buffer;

free:
	free(buffer);
close:
	close_noerr(fd);
	return NULL;
}

static char *skip_line(char *p)
{