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| Source at commit 1292 created 12 years 8 months ago. By meklort, Add additional functions to klibc. Remove duplicates from libsa | |
|---|---|
| 1 | /*␊ |
| 2 | * memset.c␊ |
| 3 | */␊ |
| 4 | ␊ |
| 5 | #include <string.h>␊ |
| 6 | #include <stdint.h>␊ |
| 7 | ␊ |
| 8 | void *memset(void *dst, int c, size_t n)␊ |
| 9 | {␊ |
| 10 | ␉char *q = dst;␊ |
| 11 | ␊ |
| 12 | #if defined(__i386__)␊ |
| 13 | ␉size_t nl = n >> 2;␊ |
| 14 | ␉asm volatile ("cld ; rep ; stosl ; movl %3,%0 ; rep ; stosb"␊ |
| 15 | ␉␉ : "+c" (nl), "+D" (q)␊ |
| 16 | ␉␉ : "a" ((unsigned char)c * 0x01010101U), "r" (n & 3));␊ |
| 17 | #elif defined(__x86_64__)␊ |
| 18 | ␉size_t nq = n >> 3;␊ |
| 19 | ␉asm volatile ("cld ; rep ; stosq ; movl %3,%%ecx ; rep ; stosb"␊ |
| 20 | ␉␉ :"+c" (nq), "+D" (q)␊ |
| 21 | ␉␉ : "a" ((unsigned char)c * 0x0101010101010101U),␊ |
| 22 | ␉␉␉"r" ((uint32_t) n & 7));␊ |
| 23 | #else␊ |
| 24 | ␉while (n--) {␊ |
| 25 | ␉␉*q++ = c;␊ |
| 26 | ␉}␊ |
| 27 | #endif␊ |
| 28 | ␊ |
| 29 | ␉return dst;␊ |
| 30 | }␊ |
| 31 | |
