C Check Substring of a String C
- by user69514
I'm trying to check whether or not the second argument in my program is a substring of the first argument. The problem is that it only work if the substring starts with the same letter of the string.
EDIT: It must be done in C, not C++. Sorry
#include <stdio.h>
#include <string.h>
int my_strstr( char const *s, char const *sub ) {
char const *ret = sub;
while ( ret = strchr( ret, *sub ) ) {
if ( strcmp( ++ret, sub+1 ) == 0 )
return 1;
}
return 0;
}
int main(int argc, char **argv){
if (argc != 3) {
printf ("Usage: check <string one> <string two>\n");
}
int result = my_strstr(argv[1], argv[2]);
if(result == 1){
printf("%s is a substring of %s\n", argv[2], argv[1]);
}
else{
printf("%s is not a substring of %s\n", argv[2], argv[1]);
}
return 0;
}
