Convert hex string to binary, alternative to sscanf()

chex.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void print_hex(unsigned char *s, size_t n) {
	int i;
	for (i=0; i<n; ++i)
		printf("%02x", (unsigned int)s[i]);
	printf("\n");
}

void hextobin(unsigned char *v, unsigned char *s, size_t n) {
	int i;
	char _t[3];
	unsigned char *p = s;
	for (i=0; i<n; ++i) {
		memcpy(_t, p, 2);
		_t[2] = '\0';
		v[i] = (int)strtol(_t, NULL, 16);
		p += 2;
	}
}

int main(int argc, char *argv[]) {
	char t[] = "de2779a7e8209172f5fe04912bfd1330c5ffac3da94f095fcdbcd331758a836b";
	int n = strlen(t);
	char v[n/2];

	hextobin(v, t, n/2);
	print_hex(v, n/2);

	return 0;
}