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annotate lwlib/lw_string.c @ 389:2d9b7ae6c329

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Throw error if address overflows in extended mode This may or may not cause extra problems due to sloppiness in dealing with calculations that overflow in 16 bits. However, presumably it is a good idea so unless something major pops up, it seems like a good idea. Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 13 Jul 2015 21:37:49 -0600
parents 8e25147c2aa8
children
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1 /*
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2 lw_string.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <string.h>
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23 #include <stdlib.h>
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24
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25 #include "lw_alloc.h"
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26 #include "lw_string.h"
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27
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28 char *lw_strdup(const char *s)
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29 {
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30 char *r;
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31
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32 if (!s)
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33 s = "(null)";
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34
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35 r = lw_alloc(strlen(s) + 1);
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36 strcpy(r, s);
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37 return r;
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38 }
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39
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40 char *lw_strndup(const char *s, int len)
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41 {
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42 char *r;
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43 int sl;
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44
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45 sl = strlen(s);
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46 if (sl > len)
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47 sl = len;
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48
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49 r = lw_alloc(sl + 1);
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50 memmove(r, s, sl);
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51 r[sl] = '\0';
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52 return r;
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53 }
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54
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55 char *lw_token(const char *s, int sep, const char **ap)
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56 {
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57 const char *p;
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58 char *r;
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59
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60 if (!s)
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61 return NULL;
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62
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63 p = strchr(s, sep);
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64 if (!p)
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65 {
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66 if (ap)
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67 *ap = NULL;
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68 return lw_strdup(s);
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69 }
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70
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71 r = lw_alloc(p - s + 1);
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72 strncpy(r, (char *)s, p - s);
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73 r[p - s] = '\0';
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74
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75 if (ap)
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76 {
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77 while (*p && *p == sep)
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78 p++;
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79 *ap = p;
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80 }
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81 return r;
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82 }