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

1.1       root        1: //////////
                      2: / libc/string/i386/strchr.s
                      3: / i386 C string library.
                      4: / ANSI 4.11.5.2.
                      5: //////////
                      6: 
                      7: //////////
                      8: / char *
                      9: / strchr(char *String, int Char)
                     10: /
                     11: / Find Char in String, return pointer or NULL.
                     12: / Previously known as index().
                     13: //////////
                     14: 
                     15: String .equ    8
                     16: Char   .equ    String+4
                     17: 
                     18:        .globl  strchr
                     19: 
                     20: strchr:
                     21:        push    %esi
                     22: 
                     23:        movl    %esi, String(%esp)      / String address to ESI
                     24:        movb    %ah, Char(%esp)         / Char to AH
                     25:        cld
                     26: 
                     27: ?loop:
                     28:        lodsb                           / Fetch String character to AL
                     29:        cmpb    %al, %ah                / and compare to Char
                     30:        je      ?matched
                     31:        orb     %al, %al                / Test for NUL
                     32:        jne     ?loop                   / Not done
                     33:        subl    %eax, %eax              / End of String, return NULL
                     34:        jmp     ?done
                     35: 
                     36: ?matched:
                     37:        decl    %esi                    / Back up to match
                     38:        movl    %eax, %esi              / Return pointer in EAX
                     39: 
                     40: ?done:
                     41:        pop     %esi
                     42:        ret
                     43: 
                     44: / end of libc/string/i386/strchr.s

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