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

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