| 1,27 → 1,22 |
|---|
| # _strncpy() Author: Kees J. Bot |
| # 1 Jan 1994 |
| /* _strncpy() Author: Kees J. Bot */ |
| /* 1 Jan 1994 */ |
| |
| # char *_strncpy(char *s1, const char *s2, size_t ecx) |
| # Copy string s2 to s1. |
| # |
| /* char *_strncpy(char *s1, const char *s2, size_t ecx) */ |
| /* Copy string s2 to s1. */ |
| /* */ |
| #include "asm.h" |
| |
| .intel_syntax |
| ENTRY(_strncpy) |
| movl 12(%ebp), %edi /* edi = string s2 */ |
| xorb %al, %al /* Look for a zero byte */ |
| movl %ecx, %edx /* Save maximum count */ |
| cld |
| |
| .text |
| .globl __strncpy |
| .align 16 |
| repne scasb /* Look for end of s2 */ |
| subl %ecx, %edx /* Number of bytes in s2 including null */ |
| xchgl %edx, %ecx |
| movl 12(%ebp), %esi /* esi = string s2 */ |
| movl 8(%ebp), %edi /* edi = string s1 */ |
| |
| __strncpy: |
| mov edi, [ebp+12] # edi = string s2 |
| xorb al, al # Look for a zero byte |
| mov edx, ecx # Save maximum count |
| cld |
| repne |
| scasb # Look for end of s2 |
| sub edx, ecx # Number of bytes in s2 including null |
| xchg ecx, edx |
| mov esi, [ebp+12] # esi = string s2 |
| mov edi, [ebp+8] # edi = string s1 |
| rep |
| movsb # Copy bytes |
| rep movsb /* Copy bytes */ |
| ret |