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Annotation of cci/usr/src/lib/libc/compat-sys5/strcatn.s, revision 1.1.1.1

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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