Rev 8793 | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed
| Rev 8793 | Rev 9765 | ||
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| 1 | /* strncat( 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. |
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| 5 | */ |
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| 6 | - | ||
| 7 | #include |
1 | #include |
| Line 8... | Line 2... | ||
| 8 | 2 | ||
| 9 | char * strncat( char * s1, const char * s2, size_t n ) |
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| 10 | { |
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| 11 | char * rc = s1; |
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| 12 | - | ||
| 13 | while ( *s1 ) |
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| 14 | { |
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| 15 | ++s1; |
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| 16 | } |
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| 17 | - | ||
| 18 | while ( n && ( *s1++ = *s2++ ) ) |
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| 19 | { |
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| 20 | --n; |
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| 21 | } |
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| 22 | - | ||
| 23 | if ( n == 0 ) |
3 | char* strncat(char* dst, const char* src, size_t n) |
| - | 4 | { |
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| - | 5 | int d0, d1, d2, d3; |
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| - | 6 | __asm__ __volatile__( |
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| 24 | { |
7 | "repne\n\t" |
| - | 8 | "scasb\n\t" |
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| - | 9 | "decl %1\n\t" |
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| - | 10 | "movl %8,%3\n" |
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| - | 11 | "1:\tdecl %3\n\t" |
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| - | 12 | "js 2f\n\t" |
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| - | 13 | "lodsb\n\t" |
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| - | 14 | "stosb\n\t" |
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| - | 15 | "testb %%al,%%al\n\t" |
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| - | 16 | "jne 1b\n" |
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| 25 | *s1 = '\0'; |
17 | "2:\txorl %2,%2\n\t" |
| 26 | } |
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| - | 18 | "stosb" |
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| - | 19 | : "=&S"(d0), "=&D"(d1), "=&a"(d2), "=&c"(d3) |
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| - | 20 | : "0"(src), "1"(dst), "2"(0), "3"(0xffffffff), "g"(n) |
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| 27 | 21 | : "memory"); |
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| 28 | return rc; |
22 | return dst; |
| 29 | } |
23 | } |