4.3BSD - /usr/src/new/icon/rt/lexcmp.c

   1: #include "../h/rt.h"
   2: 
   3: /*
   4:  * lexcmp - lexically compare two strings.
   5:  */
   6: 
   7: lexcmp(d1, d2)
   8: struct descrip *d1, *d2;
   9:    {
  10:    register char *s1, *s2;
  11:    register int minlen;
  12:    int l1, l2;
  13: 
  14:    /*
  15:     * Get length and starting address of both strings.
  16:     */
  17:    l1 = STRLEN(*d1);
  18:    s1 = STRLOC(*d1);
  19:    l2 = STRLEN(*d2);
  20:    s2 = STRLOC(*d2);
  21: 
  22:    /*
  23:     * Set minlen to length of the shorter string.
  24:     */
  25:    minlen = (l1 <= l2) ? l1 : l2;
  26: 
  27:    /*
  28:     * Compare as many bytes as are in the smaller string.  If an
  29:     *  inequality is found, return the difference of the differing
  30:     *  bytes.
  31:     */
  32:    while (minlen--)
  33:       if (*s1++ != *s2++)
  34:          return ((*--s1 & 0377) - (*--s2 & 0377));
  35: 
  36:    /*
  37:     * The strings compared equal for the length of the shorter.  Return
  38:     *  the difference in their lengths.  (Thus, the strings must be of
  39:     *  the same length to be equal.)
  40:     */
  41:    return (l1 - l2);
  42:    }

Defined functions