Return to strncat.s CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / gen / gen.tahoe

Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/strncat.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      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:  *
                     17:  * This code is derived from software contributed to Berkeley by
                     18:  * Computer Consoles Inc.
                     19:  */
                     20: 
                     21: #if defined(LIBC_SCCS) && !defined(lint)
                     22:        .asciz "@(#)strncat.s   1.4 (Berkeley) 6/27/88"
                     23: #endif /* LIBC_SCCS and not lint */
                     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
                     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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.