a c function to dump the buffer in hex

dumpbuffer.c

#include <stdio.h>

char hexstr[]="0123456789ABCDEF";
void hexdump(char* buf, int len) {
    int i;
    for(i=0;i<len;++i) {
        int hi=(buf[i] >> 4) & 0x0f;
        int lo=(buf[i] & 0x0f);
        printf("%c%c,",hexstr[hi],hexstr[lo]);
    }
    printf("\n");
}

int main() 
{
    char buf[100];
    hexdump(buf,100);
    return 0;
}