1 | /* append a string */ |
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2 | /* Copyright (c) Olly Betts 1999 |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License as published by |
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6 | * the Free Software Foundation; either version 2 of the License, or |
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7 | * (at your option) any later version. |
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * GNU General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU General Public License |
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15 | * along with this program; if not, write to the Free Software |
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16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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17 | */ |
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18 | |
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19 | #include <string.h> |
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20 | |
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21 | #include "osalloc.h" |
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22 | #include "str.h" |
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23 | |
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24 | /* append a string */ |
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25 | void |
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26 | s_cat(char **pstr, int *plen, char *s) |
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27 | { |
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28 | int new_len = strlen(s) + 1; /* extra 1 for nul */ |
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29 | int len = 0; |
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30 | |
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31 | if (*pstr) { |
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32 | len = strlen(*pstr); |
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33 | new_len += len; |
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34 | } |
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35 | |
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36 | if (!*pstr || new_len > *plen) { |
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37 | *plen = (new_len + 32) & ~3; |
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38 | *pstr = osrealloc(*pstr, *plen); |
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39 | } |
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40 | |
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41 | strcpy(*pstr + len, s); |
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42 | } |
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43 | |
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44 | /* append a character */ |
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45 | void |
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46 | s_catchar(char **pstr, int *plen, char ch) |
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47 | { |
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48 | int new_len = 2; /* extra 1 for nul */ |
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49 | int len = 0; |
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50 | |
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51 | if (*pstr) { |
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52 | len = strlen(*pstr); |
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53 | new_len += len; |
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54 | } |
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55 | |
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56 | if (!*pstr || new_len > *plen) { |
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57 | *plen = (new_len + 32) & ~3; |
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58 | *pstr = osrealloc(*pstr, *plen); |
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59 | } |
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60 | |
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61 | (*pstr)[len] = ch; |
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62 | (*pstr)[len + 1] = '\0'; |
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63 | } |
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64 | |
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65 | /* truncate string to zero length */ |
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66 | void |
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67 | s_zero(char **pstr) |
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68 | { |
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69 | if (*pstr) **pstr = '\0'; |
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70 | } |
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71 | |
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72 | void |
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73 | s_free(char **pstr) |
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74 | { |
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75 | if (*pstr) { |
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76 | osfree(*pstr); |
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77 | *pstr = NULL; |
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78 | } |
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79 | } |
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