UNIX 7th Ed. - /usr/src/libc/gen/strcat.c

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

Defined functions