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 <picolibc.h> 13 14 #include <string.h> 15 #include <stdint.h> 16 #include "local.h" 17 18 #undef strcpy 19 strcpy(char * dst,const char * src)20char *strcpy(char *dst, const char *src) 21 { 22 char *dst0 = dst; 23 24 #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) 25 int misaligned = ((uintptr_t)dst | (uintptr_t)src) & (sizeof (long) - 1); 26 if (__builtin_expect(!misaligned, 1)) 27 { 28 long *ldst = (long *)dst; 29 const long *lsrc = (const long *)src; 30 31 while (!__libc_detect_null(*lsrc)) 32 *ldst++ = *lsrc++; 33 34 dst = (char *)ldst; 35 src = (const char *)lsrc; 36 37 char c0 = src[0]; 38 char c1 = src[1]; 39 char c2 = src[2]; 40 if (!(*dst++ = c0)) return dst0; 41 if (!(*dst++ = c1)) return dst0; 42 char c3 = src[3]; 43 if (!(*dst++ = c2)) return dst0; 44 if (sizeof (long) == 4) goto out; 45 char c4 = src[4]; 46 if (!(*dst++ = c3)) return dst0; 47 char c5 = src[5]; 48 if (!(*dst++ = c4)) return dst0; 49 char c6 = src[6]; 50 if (!(*dst++ = c5)) return dst0; 51 if (!(*dst++ = c6)) return dst0; 52 53 out: 54 *dst++ = 0; 55 return dst0; 56 } 57 #endif /* not PREFER_SIZE_OVER_SPEED */ 58 59 char ch; 60 do 61 { 62 ch = *src; 63 src++; 64 dst++; 65 *(dst - 1) = ch; 66 } while (ch); 67 68 return dst0; 69 } 70
