projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f15e832d KB |
1 | /* |
| 2 | * Copyright (c) 1988 Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 019bea33 | 5 | * %sccs.include.redist.c% |
| 4afb9d15 | 6 | * |
| f15e832d KB |
7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Computer Consoles Inc. | |
| f15e832d KB |
9 | */ |
| 10 | ||
| 11 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 019bea33 | 12 | .asciz "@(#)strncat.s 1.5 (Berkeley) %G%" |
| f15e832d | 13 | #endif /* LIBC_SCCS and not lint */ |
| a3fc73ba SL |
14 | |
| 15 | /* | |
| 16 | * Concatenate s2 on the end of s1. S1's space must be large enough. | |
| 17 | * At most n characters are moved. | |
| 18 | * Return s1. | |
| 19 | * | |
| 20 | * char *strncat(s1, s2, n) | |
| 21 | * register char *s1, *s2; | |
| 22 | * register n; | |
| 23 | */ | |
| 24 | #include "DEFS.h" | |
| 25 | ||
| 26 | ENTRY(strncat, 0) | |
| 27 | tstl 12(fp) | |
| 28 | jgtr n_ok | |
| 29 | movl 4(fp),r0 | |
| a3fc73ba SL |
30 | ret |
| 31 | n_ok: | |
| 32 | movl 8(fp),r0 | |
| 33 | movl r0,r1 | |
| 34 | cmps2 # r0 points at null at end of s2 | |
| 35 | subl3 8(fp),r0,r2 # r2 = numberof non-null chars in s2 | |
| 36 | cmpl 12(fp),r2 | |
| 37 | jgeq r2_ok | |
| 38 | movl 12(fp),r2 # r2 = min (n, length(s2)) | |
| 39 | r2_ok: | |
| 40 | movl 4(fp),r0 | |
| 41 | movl r0,r1 | |
| 42 | cmps2 # r1 points at null at end of s1 | |
| 43 | movl 8(fp),r0 # source for copy | |
| 44 | movs3 # actual copy | |
| 45 | clrb (r1) # null terminated string ! | |
| 46 | movl 4(fp),r0 | |
| 47 | ret |