memchr, memrchr, rawmemchr

#include <stdio.h>
#include <stdlib.h>
#define __USE_GNU //memrchr, rawmemchr
#include <string.h>

int main (int argc, char **argv){

char str1[]="https://www.example.org";
char *retStr;
int c = '.';

/*
scan memory for a character
void *memchr(const void *str, int c, size_t n)
void *memrchr(const void *str, int c, size_t n);
void *rawmemchr(const void *str, int c);
*/

retStr = memchr(str1, c, strlen(str1));

if(retStr == NULL) printf("not found (1)");
else printf("%s\n%s\n",str1,retStr);

retStr = memrchr(str1, c, strlen(str1));
if(retStr == NULL) printf("not found (2)");
else printf("%s\n",retStr);

//testing
retStr = rawmemchr(str1, '\0');
printf("%lu %lu\n",strlen(str1),retStr-str1);


return 0;
}

/*
https://www.example.org
.example.org
.org
23 23
*/