Rev 8793 | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed
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| 1 | /* strncmp( const char *, const char *, size_t ) |
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| 2 | - | ||
| 3 | This file is part of the Public Domain C Library (PDCLib). |
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| 4 | Permission is granted to use, modify, and / or redistribute at will. |
1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 5 | */ |
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| 6 | - | ||
| 7 | #include |
2 | #include |
| Line 8... | Line 3... | ||
| 8 | 3 | ||
| 9 | int strncmp( const char * s1, const char * s2, size_t n ) |
4 | int strncmp(const char* s1, const char* s2, size_t n) |
| 10 | { |
5 | { |
| 11 | while ( n && *s1 && ( *s1 == *s2 ) ) |
6 | register int __res; |
| - | 7 | int d0, d1, d2; |
|
| 12 | { |
8 | __asm__ __volatile__( |
| 13 | ++s1; |
9 | "1:\tdecl %3\n\t" |
| 14 | ++s2; |
10 | "js 2f\n\t" |
| 15 | --n; |
11 | "lodsb\n\t" |
| 16 | } |
- | |
| 17 | 12 | "scasb\n\t" |
|
| 18 | if ( n == 0 ) |
13 | "jne 3f\n\t" |
| 19 | { |
14 | "testb %%al,%%al\n\t" |
| - | 15 | "jne 1b\n" |
|
| 20 | return 0; |
16 | "2:\txorl %%eax,%%eax\n\t" |
| - | 17 | "jmp 4f\n" |
|
| 21 | } |
18 | "3:\tsbbl %%eax,%%eax\n\t" |
| 22 | else |
19 | "orb $1,%%al\n" |
| 23 | { |
20 | "4:" |
| - | 21 | : "=a"(__res), "=&S"(d0), "=&D"(d1), "=&c"(d2) |
|
| 24 | return ( *( unsigned char * )s1 - * ( unsigned char * )s2 ); |
22 | : "1"(s1), "2"(s2), "3"(n)); |
| 25 | } |
23 | return __res; |
| 26 | } |
24 | } |