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annotate lwlib/lw_string.c @ 547:33e37b3d98cf

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Don't build snprintf() emulation on modern enough MSVC MSVC 2015 and later have a C99 compliant snprintf() so don't build the emulation function for it if building on a modern enough version.
author William Astle <lost@l-w.ca>
date Thu, 16 Mar 2023 16:18:13 -0600
parents 8e25147c2aa8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }