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

1.1       root        1: //////////
                      2: / libc/string/i386/strpbrk.s
                      3: / i386 C string library.
                      4: / ANSI 4.11.5.4.
                      5: //////////
                      6: 
                      7: //////////
                      8: / char *
                      9: / strpbrk(char *String1, char *String2)
                     10: /
                     11: / Return a pointer to the first char in String1
                     12: / which matches any character in String2.
                     13: //////////
                     14: 
                     15: String1        .equ    12
                     16: String2        .equ    String1+4
                     17: 
                     18:        .globl  strpbrk
                     19: 
                     20: strpbrk:
                     21:        push    %esi
                     22:        push    %edi
                     23: 
                     24:        movl    %edi, String1(%esp)     / String1 to EDI
                     25:        subl    %eax, %eax              / Clear EAX for NULL return value
                     26:        cld
                     27: 
                     28:        / AL and the high word of EAX are always 0 here.
                     29: ?fetch1:
                     30:        movb    %ah, (%edi)             / Fetch String1 char to AH
                     31:        incl    %edi                    / and point to next
                     32:        orb     %ah, %ah
                     33:        jz      ?done                   / No match found, return NULL
                     34:        movl    %esi, String2(%esp)     / String2 to ESI
                     35: 
                     36: ?fetch2:
                     37:        lodsb                           / Fetch String2 char to AL
                     38:        orb     %al, %al
                     39:        jz      ?fetch1                 / No match in String2, try next String1 char
                     40:        cmpb    %ah, %al
                     41:        jnz     ?fetch2                 / Mismatch, try next String2 char
                     42:        decl    %edi                    / Back up to match 
                     43:        movl    %eax, %edi              / Return pointer in EAX
                     44: 
                     45: ?done:
                     46:        pop     %edi
                     47:        pop     %esi
                     48:        ret
                     49: 
                     50: / end of libc/string/i386/strpbrk.s

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