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