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

1.1       root        1: //////////
                      2: / libc/string/i386/memchr.s
                      3: / i386 C string library.
                      4: / ANSI 4.11.5.1.
                      5: //////////
                      6: 
                      7: //////////
                      8: / void *
                      9: / memchr(void *String, int Char, size_t Count)
                     10: /
                     11: / Find Char in String, return pointer or NULL.
                     12: //////////
                     13: 
                     14: String .equ    8
                     15: Char   .equ    String+4
                     16: Count  .equ    Char+4
                     17: 
                     18:        .globl memchr
                     19: 
                     20: memchr:
                     21:        push    %edi
                     22: 
                     23:        movl    %ecx, Count(%esp)       / Count to ECX
                     24:        jecxz   ?nomatch                / No match possible in 0 characters
                     25:        movl    %edi, String(%esp)      / String to EDI
                     26:        movb    %al, Char(%esp)         / Char to AL
                     27:        cld
                     28:        repne
                     29:        scasb                           / Look for character
                     30:        jnz     ?nomatch                / No match found
                     31:        decl    %edi                    / Back up to match (if any)
                     32:        movl    %eax, %edi              / Return pointer in EAX
                     33: 
                     34: ?done:
                     35:        pop     %edi
                     36:        ret
                     37: 
                     38: ?nomatch:
                     39:        subl    %eax, %eax              / No match, return NULL
                     40:        jmp     ?done
                     41: 
                     42: / end of libc/string/i386/memchr.s

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