strstr

   NAME
    strstr  - find sub string within another string


   SYNOPSIS
    char *ptr = strstr(s, sub);
    const char *s;
    const char *sub;

   FUNCTION
    The string s is scanned until the sub string sub matches the string
    beginning at the current scan point, and a pointer to the sub string
    within s is returned.  If the sub string could not be found NULL
    is returned.

   EXAMPLE
    #include <stdio.h>
    #include <string.h>
    #include <assert.h>

    main()
    {
        char *s = "abcdefghijklmnopqrstuvwxyz";
        char *ptr;

        ptr = strstr(s, "klm");
        assert(ptr == s + 10);

        puts(ptr);          /*  klmnopqrstuvwxyz    */

        return(0);
    }

   INPUTS
    char *s;    pointer to string to scan
    char *toks; pointer to string containing characters to compare
            against

   RESULTS
    char *ptr;  point in s where sub string was found or NULL if
            sub string could not be found.

   SEE ALSO
    strpbrk, strcspn