str_str() for those who need it

From: Akuma/Chris Baggett/DOOMer (doomer@BAYOU.COM)
Date: 01/15/98

ok, in the way of str_cmp, str_dup, strn_cmp, et al.
I have created a str_str() function that works correctly.

It's taken me awhile, but it requires nothing else
than is_abbrev() (which is stock anyway) and it works fine for me :-)
btw, I finally converted all the functions to check == LOWER instead
of modifying the string.  Maybe this function should be stock also???
*nudge George*
anyway, here it is, it's a short one.

put this prototype in utils.h
char *str_str(char *arg1, char *arg2);
Begin Code (put it in utils.c)-------
// str_str: a case-insensitive version of strstr()
// scans arg1 for the first occurrence of the substring arg2
// returns a pointer to the point in arg1 where arg2 begins.
// If arg2 does not occur in arg1, str_str returns NULL.
// Written by Akuma the Raging Coder
char *str_str(char *arg1, char *arg2)
register int iptr;
register int len1;
register int len2;

 if (!arg1 && !arg2)
  { log("NULL arg1 and arg2 passed to %s().", __FUNCTION__); return NULL; }
 else if (!arg1)
   { log("NULL arg1 passed to %s().", __FUNCTION__); return NULL; }
 else if (!arg2)
   { log("NULL arg2 passed to %s().", __FUNCTION__); return NULL; }

     len1 = str_len(arg2);
     len2 = str_len(arg1);

 // if str_len(arg2) is greater than str_len(arg1),
 // then arg2 can't be substring of arg1
 if (len1 > len2)
    return NULL;
 else if (len1 == len2) {
      if (!str_cmp(arg1, arg2))
         return (arg1);
      else return NULL;
 for (iptr = 0; iptr <= len2 - len1; iptr++) {
     if (LOWER(*arg2) == LOWER(*(arg1+iptr)) &&
         is_abbrev(arg2, (arg1 + iptr)))
        return (arg1+iptr);
 // Obviously we reached the end, and nothing was found.
 return NULL;
-----End Code

Anyway, think about making this a stock addition, along with changing
one_argument, et al to check == LOWER(*ptr) instead of modifying the string.
of course, it requires that small modification from functions like
any_one_arg all the way to search_block().

so, that's it.  Just leave my name in the comment,
and that'll be fine with me. :-)

Code On
Akuma the Raging Coder

  | "The poets talk about love, but what I talk about is DOOM, |
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  |   Alex Machine/George Stark/Stephen King, The Dark Half    |
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