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annotate lwlib/lw_string.c @ 218:b0c9df865b25

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Add FDBS pseudo op. Add FDBS pseudo op which is just like FDB but it swaps the bytes of the operands. It is undocumented intentionally.
author William Astle <lost@l-w.ca>
date Sun, 10 Jun 2012 14:55:27 -0600
parents 2c24602be78f
children 8e25147c2aa8
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 #define ___lw_string_c_seen___
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26 #include "lw_alloc.h"
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27 #include "lw_string.h"
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28
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29 char *lw_strdup(const char *s)
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30 {
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31 char *r;
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32
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33 if (!s)
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34 s = "(null)";
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35
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36 r = lw_alloc(strlen(s) + 1);
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37 strcpy(r, s);
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38 return r;
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39 }
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40
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41 char *lw_strndup(const char *s, int len)
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42 {
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43 char *r;
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44 int sl;
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45
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46 sl = strlen(s);
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47 if (sl > len)
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48 sl = len;
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49
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50 r = lw_alloc(sl + 1);
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51 memmove(r, s, sl);
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52 r[sl] = '\0';
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53 return r;
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54 }
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55
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56 char *lw_token(const char *s, int sep, const char **ap)
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57 {
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58 const char *p;
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59 char *r;
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60
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61 if (!s)
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62 return NULL;
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63
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64 p = strchr(s, sep);
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65 if (!p)
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66 {
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67 if (ap)
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68 *ap = NULL;
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69 return lw_strdup(s);
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70 }
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71
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72 r = lw_alloc(p - s + 1);
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73 strncpy(r, (char *)s, p - s);
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74 r[p - s] = '\0';
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75
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76 if (ap)
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77 {
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78 while (*p && *p == sep)
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79 p++;
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80 *ap = p;
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81 }
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82 return r;
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83 }