projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 586c39b1 DF |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 493b70ca KB |
3 | * All rights reserved. |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms are permitted | |
| f4f66d2c KB |
6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, | |
| 8 | * advertising materials, and other materials related to such | |
| 9 | * distribution and use acknowledge that the software was developed | |
| 10 | * by the University of California, Berkeley. The name of the | |
| 11 | * University may not be used to endorse or promote products derived | |
| 12 | * from this software without specific prior written permission. | |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 586c39b1 DF |
16 | */ |
| 17 | ||
| f4f66d2c KB |
18 | #if defined(LIBC_SCCS) && !defined(lint) |
| 19 | .asciz "@(#)strcat.s 5.5 (Berkeley) %G%" | |
| 20 | #endif /* LIBC_SCCS and not lint */ | |
| 3d55afdc SL |
21 | |
| 22 | /* | |
| 23 | * Concatenate string s2 to the end of s1 | |
| 24 | * and return the base of s1. | |
| 25 | * | |
| 26 | * char * | |
| 27 | * strcat(s1, s2) | |
| 28 | * char *s1, *s2; | |
| 29 | */ | |
| dadab5a2 | 30 | #include "DEFS.h" |
| 3d55afdc | 31 | |
| dadab5a2 | 32 | ENTRY(strcat, R6|R7) |
| 3d55afdc SL |
33 | movq 4(ap), r6 # r6 = s1; r7 = s2 |
| 34 | movl r6,r1 | |
| 35 | 0: | |
| 36 | locc $0,$65535,(r1) # look for '\0' | |
| 37 | beql 0b | |
| 38 | movl r1,r3 # save end of s1 | |
| 39 | 1: | |
| 40 | locc $0,$65535,(r7) # find length of s2 | |
| 41 | bneq 2f | |
| 42 | movc3 $65535,(r7),(r3)# copy full block | |
| 43 | movl r1,r7 | |
| 44 | jbr 1b | |
| 45 | 2: | |
| 46 | subl2 r7,r1 # calculate length | |
| 47 | incl r1 | |
| 48 | movc3 r1,(r7),(r3) # copy remainder | |
| 49 | movl r6,r0 | |
| 50 | ret |