/ strrchr.s (emx+gcc) -- Copyright (c) 1990-1993 by Eberhard Mattes

        .globl _strrchr
  
/ char *strrchr (const char *string, int c)
/ {
/   int i;
/   
/   i = 0;
/   while (string[i] != 0) ++i;
/   while (i >= 0)
/     if (string[i] == (char)c)
/       return ((char *)(string+i));
/     else
/       --i;
/   return (NULL);
/ }

        .text

        .align  2, 0x90

_strrchr:
        pushl   %edi
        movl    2*4(%esp), %edi         / string
        movl    $-1, %ecx
        xorb    %al, %al
        repne
        scasb
        notl    %ecx                    / ecx = strlen (string) + 1
        decl    %edi                    / edi = string + strlen (string)
        movb    3*4(%esp), %al          / c
        std
        repne
        scasb
        cld
        jne     1f
        lea     1(%edi), %eax
        popl    %edi
        ret

        .align  2, 0x90
1:      xorl    %eax, %eax
        popl    %edi
        ret