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Annotation of cci/usr/src/lib/libc/compat-sys5/strcatn.s, revision 1.1

1.1     ! root        1: 
        !             2: /*
        !             3:  * strcatn.s   4.1 (Tahoe) June 1983 
        !             4:  * 
        !             5:  * Concatenate s2 on the end of s1.  S1's space must be large enough.
        !             6:  * At most n characters are moved.
        !             7:  * Return s1.
        !             8:  * 
        !             9:  * char *strcatn(s1, s2, n)
        !            10:  * register char *s1, *s2;
        !            11:  * register n;
        !            12: */
        !            13: 
        !            14:        .text
        !            15:        .globl  _strcatn
        !            16:        .align  1
        !            17: _strcatn:
        !            18:        .word   4               # saves r2
        !            19: 
        !            20:        tstl    12(fp)
        !            21:        jgtr    n_ok
        !            22:        movl    4(fp),r0
        !            23:        clrb    (r0)
        !            24:        ret
        !            25: n_ok:
        !            26:        movl    8(fp),r0
        !            27:        movl    r0,r1
        !            28:        cmps2                   # r0 points at null at end of s2
        !            29:        subl3   8(fp),r0,r2     # r2 = numberof non-null chars in s2
        !            30:        cmpl    12(fp),r2
        !            31:        jgeq    r2_ok
        !            32:        movl    12(fp),r2       # r2 = min (n, length(s2))
        !            33: r2_ok:
        !            34:        movl    4(fp),r0
        !            35:        movl    r0,r1
        !            36:        cmps2                   # r1 points at null at end of s1
        !            37:        movl    8(fp),r0        # source for copy
        !            38:        movs3                   # actual copy
        !            39:        clrb    (r1)            # null terminated string !
        !            40:        movl    4(fp),r0
        !            41:        ret

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