Category : C Source Code
Archive   : EMXLIB8C.ZIP
Filename : MEMCHR.S

/ memchr.s (emx/gcc) -- Copyright (c) 1990-1992 by Eberhard Mattes

.globl _memchr

/ void *memchr (const void *s, int c, size_t n)
/ {
/ size_t i;
/ const char *p;
/
/ p = s;
/ for (i = 0; i < n; ++i)
/ if (p[i] == (char)c)
/ return ((void *)(p+i));
/ return (NULL);
/ }

/ assumes ds=es!

.text
.align 2, 0x90

_memchr:
pushl %edi
movl 2*4(%esp), %edi / s
movb 3*4(%esp), %al / c
movl 4*4(%esp), %ecx / n
jecxz 1f / not found
repne
scasb
jne 1f / not found
lea -1(%edi), %eax
popl %edi
ret

1: xorl %eax, %eax / return (NULL)
popl %edi
ret