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996
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1 /*
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2 * Copyright (C) 2009 Gregor Richards
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining a copy
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5 * of this software and associated documentation files (the "Software"), to deal
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6 * in the Software without restriction, including without limitation the rights
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7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 * copies of the Software, and to permit persons to whom the Software is
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9 * furnished to do so, subject to the following conditions:
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10 *
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11 * The above copyright notice and this permission notice shall be included in
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12 * all copies or substantial portions of the Software.
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13 *
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14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 * THE SOFTWARE.
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21 */
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22
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23 #ifndef BUFFER_H
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24 #define BUFFER_H
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25
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26 #include "helpers.h"
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27
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28 #define BUFFER_DEFAULT_SIZE 1024
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29
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30 /* auto-expanding buffer */
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31 #define BUFFER(name, type) \
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32 struct Buffer_ ## name { \
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33 size_t bufsz, bufused; \
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34 type *buf; \
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35 }
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36
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37 BUFFER(char, char);
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38 BUFFER(int, int);
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39
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40 /* initialize a buffer */
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41 #define INIT_BUFFER(buffer) \
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42 { \
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43 (buffer).bufsz = BUFFER_DEFAULT_SIZE; \
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44 (buffer).bufused = 0; \
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45 SF((buffer).buf, malloc, NULL, (BUFFER_DEFAULT_SIZE * sizeof(*(buffer).buf))); \
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46 }
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47
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48 /* free a buffer */
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49 #define FREE_BUFFER(buffer) \
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50 { \
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51 if ((buffer).buf) free((buffer).buf); \
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52 (buffer).buf = NULL; \
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53 }
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54
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55 /* the address of the free space in the buffer */
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56 #define BUFFER_END(buffer) ((buffer).buf + (buffer).bufused)
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57
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58 /* mark new bytes in a buffer */
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59 #define STEP_BUFFER(buffer, by) ((buffer).bufused += by)
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60
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61 /* the amount of space left in the buffer */
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62 #define BUFFER_SPACE(buffer) ((buffer).bufsz - (buffer).bufused)
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63
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64 /* expand a buffer */
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65 #define EXPAND_BUFFER(buffer) \
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66 { \
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67 (buffer).bufsz *= 2; \
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68 SF((buffer).buf, realloc, NULL, ((buffer).buf, (buffer).bufsz * sizeof(*(buffer).buf))); \
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69 }
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70
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71 /* write a string to a buffer */
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72 #define WRITE_BUFFER(buffer, string, len) \
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73 { \
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74 size_t _len = (len); \
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75 while (BUFFER_SPACE(buffer) < _len) { \
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76 EXPAND_BUFFER(buffer); \
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77 } \
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78 memcpy(BUFFER_END(buffer), string, _len * sizeof(*(buffer).buf)); \
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79 STEP_BUFFER(buffer, _len); \
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80 }
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81
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82 /* read a file into a buffer */
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83 #define READ_FILE_BUFFER(buffer, fh) \
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84 { \
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85 size_t _rd; \
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86 while ((_rd = fread(BUFFER_END(buffer), 1, BUFFER_SPACE(buffer), (fh))) > 0) { \
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87 STEP_BUFFER(buffer, _rd); \
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88 if (BUFFER_SPACE(buffer) <= 0) { \
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89 EXPAND_BUFFER(buffer); \
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90 } \
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91 } \
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92 }
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93
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94 #endif
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