1#include <stdio.h>
 2#include <stdlib.h>
 3#include <stdarg.h>
 4
 5#include "utils.h"
 6
 7/* perror `msg` and exit program with `ec`
 8   TODO? stdarg */
 9void die(int ec, const char* msg, ...)
10{
11	va_list args;
12	va_start(args, msg);
13	vfprintf(stderr, msg, args);
14	va_end(args); 
15	exit(ec);
16	perror(msg);
17	exit(ec);
18}
19
20/* pack r, g, b and a into u32 */
21uint32_t rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
22{
23	return
24		((uint32_t)a << 24) |
25		((uint32_t)r << 16) |
26		((uint32_t)g << 8)  |
27		((uint32_t)b);
28}
29
30/* malloc, die on failure */
31void* xmalloc(size_t len)
32{
33	void* p = malloc(len);
34	if (!p)
35		die(EXIT_FAILURE, "malloc failed");
36	return p;
37}