Very Computer

1. char *strcasestr(char *haystack, char *needle) a simple case independent strstr()

Well, I needed it, and so i wrote it.
Sort of fun.

Any 'optimizers' can have a go now :-)

char *strcasestr(char *haystack, char *needle)
{
/* case independent strstr */
char *hptr;
char *nptr;
char *pptr;

/* start at the beginning of haystack */
pptr = haystack;

/* for each position in haystack */
while(1)
        {
        /* starting at this position in haystack */
        hptr = pptr;
        nptr = needle;

        /* test if strings match from here on */
        while(1)
                {
                /* test for end of needle */
                if(*nptr == 0)
                        {
                        /* found match */
                        return pptr;
                        }

                /* test for end of haystack */
                if(*hptr == 0) break;

                /* test for any differences */
                if( toupper(*hptr) != toupper(*nptr) ) break;                

                /* increment positions in strings */
                hptr++;
                nptr++;

                }/* end while all characters in needle */

        /* try next position in haystack */
        pptr++;

        /* test for end of haystack */
        if(*pptr == 0) break;

        }/* end while all positions in haystack */

return 0;

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