projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1988 Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
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5 | * Redistribution and use in source and binary forms are permitted |
| 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. | |
| 16 | * | |
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17 | * This code is derived from software contributed to Berkeley by |
| 18 | * Computer Consoles Inc. | |
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19 | */ |
| 20 | ||
| 21 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 4afb9d15 | 22 | .asciz "@(#)strncat.s 1.4 (Berkeley) %G%" |
| f15e832d | 23 | #endif /* LIBC_SCCS and not lint */ |
| a3fc73ba SL |
24 | |
| 25 | /* | |
| 26 | * Concatenate s2 on the end of s1. S1's space must be large enough. | |
| 27 | * At most n characters are moved. | |
| 28 | * Return s1. | |
| 29 | * | |
| 30 | * char *strncat(s1, s2, n) | |
| 31 | * register char *s1, *s2; | |
| 32 | * register n; | |
| 33 | */ | |
| 34 | #include "DEFS.h" | |
| 35 | ||
| 36 | ENTRY(strncat, 0) | |
| 37 | tstl 12(fp) | |
| 38 | jgtr n_ok | |
| 39 | movl 4(fp),r0 | |
| a3fc73ba SL |
40 | ret |
| 41 | n_ok: | |
| 42 | movl 8(fp),r0 | |
| 43 | movl r0,r1 | |
| 44 | cmps2 # r0 points at null at end of s2 | |
| 45 | subl3 8(fp),r0,r2 # r2 = numberof non-null chars in s2 | |
| 46 | cmpl 12(fp),r2 | |
| 47 | jgeq r2_ok | |
| 48 | movl 12(fp),r2 # r2 = min (n, length(s2)) | |
| 49 | r2_ok: | |
| 50 | movl 4(fp),r0 | |
| 51 | movl r0,r1 | |
| 52 | cmps2 # r1 points at null at end of s1 | |
| 53 | movl 8(fp),r0 # source for copy | |
| 54 | movs3 # actual copy | |
| 55 | clrb (r1) # null terminated string ! | |
| 56 | movl 4(fp),r0 | |
| 57 | ret |