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/* finds the next instance of needle in haystack 
   zbpos: the zero-based position to begin searching from
   haystack: the string to search in
   needle: the string that must be found
   returns the next match of `needle` in `haystack`, or -1 if not found
int findnext(int zbpos, const char *haystack, const char *needle)
    char *p; 

    if (((p = strstr(haystack + zbpos, needle)) != NULL)
        return p - haystack;

    return -1;

strstr searches the haystack (first) argument for the string pointed to by needle. If found, strstr returns the address of the occurrence. If it could not find needle, it returns NULL. We use zbpos so that we don’t keep finding the same needle over and over again. In order to skip the first instance, we add an offset of zbpos. A Notepad clone might call findnext like this, in order to implement its “Find Next” dialogue:

    Called when the user clicks "Find Next"
    doc: The text of the document to search
    findwhat: The string to find
void onfindnext(const char *doc, const char *findwhat)
    static int i;

    if ((i = findnext(i, doc, findwhat)) != -1)
        /* select the text starting from i and ending at i + strlen(findwhat) */
        /* display a message box saying "end of search" */

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