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1 /* This file is part of XEmacs.
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2
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3 XEmacs is free software; you can redistribute it and/or modify it
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4 under the terms of the GNU General Public License as published by the
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5 Free Software Foundation; either version 2, or (at your option) any
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6 later version.
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7
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8 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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9 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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10 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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11 for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with XEmacs; see the file COPYING. If not, write to
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15 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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16 Boston, MA 02111-1307, USA. */
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17
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18 /* Synched up with: Not in FSF. */
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19
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20 /* In SunOS 4.1.1 the strcpy function references memory past the last byte of
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21 the string! This will core dump if the memory following the last byte is
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22 not mapped.
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23
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24 Here are correct versions by hbs@lucid.com.
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25 */
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26
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27
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28 #define ALIGNED(x) (!(((unsigned long) (x)) & (sizeof (unsigned long) - 1)))
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29
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30 #define MAGIC 0x7efefeff
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31 #define HIGH_BIT_P(c) ((c) & hi_bit)
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32 #define HAS_ZERO(c) (((((c) + magic) ^ (c)) & not_magic) != not_magic)
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33
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34 char *
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35 strcpy (char *to, const char *from)
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36 {
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37 char *return_value = to;
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38 if (to == from)
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39 return to;
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40 else if (ALIGNED (to) && ALIGNED (from))
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41 {
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42 unsigned long *to1 = (unsigned long *) to;
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43 const unsigned long *from1 = (const unsigned long *) from;
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44 unsigned long c;
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45 unsigned long magic = MAGIC;
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46 unsigned long not_magic = ~magic;
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47 /* unsigned long hi_bit = 0x80000000; */
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48
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49 while ((c = *from1) != 0)
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50 {
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51 if (HAS_ZERO(c))
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52 {
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53 to = (char *) to1;
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54 from = (const char *) from1;
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55 goto slow_loop;
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56 }
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57 else
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58 {
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59 *to1 = c;
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60 to1++;
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61 from1++;
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62 }
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63 }
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64
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65 to = (char *) to1;
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66 *to = (char) 0;
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67 return return_value;
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68 }
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69 else
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70 {
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71 char c;
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72
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73 slow_loop:
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74
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75 while ((c = *from) != 0)
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76 {
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77 *to = c;
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78 to++;
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79 from++;
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80 }
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81 *to = (char) 0;
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82 }
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83 return return_value;
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84 }
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