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Annotation of coherent/b/lib/libc/string/i386/memccpy.s, revision 1.1

1.1     ! root        1: //////////
        !             2: / libc/string/i386/memccpy.s
        !             3: / i386 C string library.
        !             4: / Not in ANSI C standard.
        !             5: //////////
        !             6: 
        !             7: ////////
        !             8: / char *
        !             9: / memccpy(char *dest, char *src, int c, size_t n)
        !            10: /
        !            11: / Copy characters from src to dest,
        !            12: / stopping after the first occurrence of character c has been copied
        !            13: / or after n characters have been copied.
        !            14: / Return a pointer to the character after the copy of c in dest,
        !            15: / or NULL if c is not found in the first n characters of src.
        !            16: /////////
        !            17: 
        !            18: dest   .equ    12
        !            19: src    .equ    dest+4
        !            20: c      .equ    src+4
        !            21: n      .equ    c+4
        !            22: 
        !            23:        .globl  memccpy
        !            24: 
        !            25: memccpy:
        !            26:        push    %esi
        !            27:        push    %edi
        !            28: 
        !            29:        movb    %al, c(%esp)            / c to AL
        !            30:        movl    %edx, n(%esp)           / n to EDX
        !            31:        movl    %edi, src(%esp)         / src to EDI
        !            32:        movl    %esi, %edi              / save src in ESI
        !            33:        movl    %ecx, %edx              / count to ECX
        !            34:        jecxz   ?copy                   / n is 0, skip looking for c, return NULL
        !            35:        cld
        !            36:        repne
        !            37:        scasb                           / Find first c in src
        !            38:        jne     ?copy                   / Not found, just copy and return NULL
        !            39:        subl    %edx, %ecx              / Adjust count for copy
        !            40:        movl    %ecx, %edi              / pointer past c in src
        !            41:        subl    %ecx, %esi              / offset to char after c in src
        !            42:        add     %ecx, dest(%esp)        / pointer to char after c in dest
        !            43: 
        !            44:        / The return value is in ECX, the count in EDX.
        !            45: ?copy:
        !            46:        movl    %eax, %ecx              / Return value to EAX
        !            47:        movl    %esi, %edi
        !            48:        movl    %edi, dest(%esp)
        !            49:        movl    %ecx, %edx              / Count to ECX
        !            50:        rep
        !            51:        movsb                           / Copy
        !            52: 
        !            53:        pop     %edi
        !            54:        pop     %esi
        !            55:        ret
        !            56: 
        !            57: / end of libc/string/i386/memccpy.s

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