1 #include "std.h"
2 #include "dat.h"
3 
4 static int
5 unhex(char c)
6 {
7 	if('0' <= c && c <= '9')
8 		return c-'0';
9 	if('a' <= c && c <= 'f')
10 		return c-'a'+10;
11 	if('A' <= c && c <= 'F')
12 		return c-'A'+10;
13 	abort();
14 	return -1;
15 }
16 
17 int
18 hexparse(char *hex, uchar *dat, int ndat)
19 {
20 	int i, n;
21 
22 	n = strlen(hex);
23 	if(n%2)
24 		return -1;
25 	n /= 2;
26 	if(n > ndat)
27 		return -1;
28 	if(hex[strspn(hex, "0123456789abcdefABCDEF")] != '\0')
29 		return -1;
30 	for(i=0; i<n; i++)
31 		dat[i] = (unhex(hex[2*i])<<4)|unhex(hex[2*i+1]);
32 	return n;
33 }
34 
35 char*
36 estrappend(char *s, char *fmt, ...)
37 {
38 	char *t;
39 	va_list arg;
40 
41 	va_start(arg, fmt);
42 	t = vsmprint(fmt, arg);
43 	if(t == nil)
44 		sysfatal("out of memory");
45 	va_end(arg);
46 	s = erealloc(s, strlen(s)+strlen(t)+1);
47 	strcat(s, t);
48 	free(t);
49 	return s;
50 }
51 
52