| 0,0 → 1,29 |
|---|
| /* memchr() Author: Kees J. Bot */ |
| /* 2 Jan 1994 */ |
| |
| /* void *memchr(const void *s, int c, size_t n) */ |
| /* Look for a character in a chunk of memory. */ |
| /* */ |
| #include "asm.h" |
| |
| ENTRY(memchr) |
| push %ebp |
| movl %esp, %ebp |
| push %edi |
| movl 8(%ebp), %edi /* edi = string */ |
| movb 12(%ebp), %al /* The character to look for */ |
| movl 16(%ebp), %ecx /* Length */ |
| cmpb $1, %cl /* 'Z' bit must be clear if ecx = 0 */ |
| cld |
| |
| repne scasb |
| jne failure |
| leal -1(%edi), %eax /* Found */ |
| pop %edi |
| pop %ebp |
| ret |
| failure: |
| xorl %eax, %eax |
| pop %edi |
| pop %ebp |
| ret |