2.9BSD - /usr/src/lib/c/gen/strcat.c

   1: /*	@(#)strcat.c	2.1	SCCS id keyword	*/
   2: /*
   3:  * Concatenate s2 on the end of s1.  S1's space must be large enough.
   4:  * Return s1.
   5:  */
   6: 
   7: char *
   8: strcat(s1, s2)
   9: register char *s1, *s2;
  10: {
  11:     register char *os1;
  12: 
  13:     os1 = s1;
  14:     while (*s1++)
  15:         ;
  16:     --s1;
  17:     while (*s1++ = *s2++)
  18:         ;
  19:     return(os1);
  20: }

Defined functions