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Annotation of coherent/b/lib/libc/string/i8086/strcmp.m, revision 1.1.1.1

1.1       root        1: //////////
                      2: / i8086 C string library.
                      3: / strcmp()
                      4: / ANSI 4.11.4.2.
                      5: //////////
                      6: 
                      7: //////////
                      8: / strcmp(String1, String2)
                      9: / char *String1, *String2;
                     10: /
                     11: / Compare String1 and String2 until mismatch or NUL seen.
                     12: //////////
                     13: 
                     14: #include <larges.h>
                     15: 
                     16: String1        =       LEFTARG
                     17: String2        =       String1+DPL
                     18: 
                     19:        Enter(strcmp_)
                     20:        Lds     si, String2(bp) / String2 address to DS:SI
                     21:        Les     di, String1(bp) / String1 address to ES:DI
                     22:        mov     cx, $0          / Result to CX
                     23:        cld
                     24: 
                     25: 1:     lodsb                   / String2 character to AL
                     26:        scasb                   / Compare to String1 character
                     27:        jne     2f              / Mismatch
                     28:        orb     al, al
                     29:        jne     1b              / Not done yet
                     30:        jmp     4f              / String1 == String2, return 0
                     31: 
                     32: 2:     ja      3f
                     33:        inc     cx              / String1 > String2, return 1
                     34:        jmp     4f
                     35: 
                     36: 3:     dec     cx              / String1 < String2, return -1
                     37: 
                     38: 4:     mov     ax, cx          / Result to AX
                     39:        Leave

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