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Annotation of coherent/b/lib/libc/string/i386/strcspn.s, revision 1.1.1.1

1.1       root        1: //////////
                      2: / libc/string/i386/strcspn.s
                      3: / i386 C string library.
                      4: / ANSI 4.11.5.3.
                      5: //////////
                      6: 
                      7: //////////
                      8: / size_t
                      9: / strcspn(char *String1, char *String2)
                     10: /
                     11: / Return the length of the initial segment of String1
                     12: / which consists of characters ->not<- in String2.
                     13: //////////
                     14: 
                     15: String1        .equ    12
                     16: String2        .equ    String1+4
                     17: 
                     18:        .globl  strcspn
                     19: 
                     20: strcspn:
                     21:        push    %esi
                     22:        push    %edi
                     23: 
                     24:        movl    %edi, String1(%esp)     / String1 address to EDI
                     25:        movl    %edx, %edi              / and save for length calculation
                     26:        cld
                     27: 
                     28: ?fetch1:
                     29:        movb    %ah, (%edi)             / String1 character to AH
                     30:        incl    %edi
                     31:        orb     %ah, %ah
                     32:        jz      ?done                   / End of String1, done
                     33:        movl    %esi, String2(%esp)     / String2 address to ESI
                     34: 
                     35: ?fetch2:
                     36:        lodsb                           / String2 character to AL
                     37:        orb     %al, %al
                     38:        jz      ?fetch1                 / Done with String2, fetch next from String1
                     39:        cmpb    %ah, %al
                     40:        jne     ?fetch2                 / Mismatched, try next in String2
                     41: 
                     42: ?done:
                     43:        decl    %edi                    / Back up to last String1 char
                     44:        movl    %eax, %edi
                     45:        subl    %eax, %edx              / Return &last - &String1
                     46: 
                     47:        pop     %edi
                     48:        pop     %esi
                     49:        ret
                     50: 
                     51: / end of libc/string/i386/strcspn.s

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