1 /* Copyright (c) 2017 SiFive Inc. All rights reserved. 2 3 This copyrighted material is made available to anyone wishing to use, 4 modify, copy, or redistribute it subject to the terms and conditions 5 of the FreeBSD License. This program is distributed in the hope that 6 it will be useful, but WITHOUT ANY WARRANTY expressed or implied, 7 including the implied warranties of MERCHANTABILITY or FITNESS FOR 8 A PARTICULAR PURPOSE. A copy of this license is available at 9 http://www.opensource.org/licenses. 10 */ 11 12 #include <string.h> 13 #include <stdint.h> 14 15 #undef strcpy 16 strcpy(char * dst,const char * src)17char *strcpy(char *dst, const char *src) 18 { 19 char *dst0 = dst; 20 21 #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) 22 int misaligned = ((uintptr_t)dst | (uintptr_t)src) & (sizeof (long) - 1); 23 if (__builtin_expect(!misaligned, 1)) 24 { 25 long *ldst = (long *)dst; 26 const long *lsrc = (const long *)src; 27 28 while (!__libc_detect_null(*lsrc)) 29 *ldst++ = *lsrc++; 30 31 dst = (char *)ldst; 32 src = (const char *)lsrc; 33 34 char c0 = src[0]; 35 char c1 = src[1]; 36 char c2 = src[2]; 37 if (!(*dst++ = c0)) return dst0; 38 if (!(*dst++ = c1)) return dst0; 39 char c3 = src[3]; 40 if (!(*dst++ = c2)) return dst0; 41 if (sizeof (long) == 4) goto out; 42 char c4 = src[4]; 43 if (!(*dst++ = c3)) return dst0; 44 char c5 = src[5]; 45 if (!(*dst++ = c4)) return dst0; 46 char c6 = src[6]; 47 if (!(*dst++ = c5)) return dst0; 48 if (!(*dst++ = c6)) return dst0; 49 50 out: 51 *dst++ = 0; 52 return dst0; 53 } 54 #endif /* not PREFER_SIZE_OVER_SPEED */ 55 56 char ch; 57 do 58 { 59 ch = *src; 60 src++; 61 dst++; 62 *(dst - 1) = ch; 63 } while (ch); 64 65 return dst0; 66 } 67
