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annotate src/blob.c @ 15456:f01eb1aed348 v8.1.0736

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patch 8.1.0736: code for Blob not sufficiently tested commit https://github.com/vim/vim/commit/c0f5a78c15b194f23bedb82e6825e34f481e6532 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 13 15:16:13 2019 +0100 patch 8.1.0736: code for Blob not sufficiently tested Problem: Code for Blob not sufficiently tested. Solution: Add more tests. Fix uncovered crash. Add test_null_blob().
author Bram Moolenaar <Bram@vim.org>
date Sun, 13 Jan 2019 15:30:08 +0100
parents 1d2b5c016f17
children 435fcefd2c8e
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1 /* vi:set ts=8 sts=4 sw=4 noet:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 * See README.txt for an overview of the Vim source code.
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8 */
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9
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10 /*
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11 * blob.c: Blob support by Yasuhiro Matsumoto
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12 */
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13
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14 #include "vim.h"
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15
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16 #if defined(FEAT_EVAL) || defined(PROTO)
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17
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18 /*
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19 * Allocate an empty blob.
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20 * Caller should take care of the reference count.
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21 */
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22 blob_T *
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23 blob_alloc(void)
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24 {
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25 blob_T *blob = (blob_T *)alloc_clear(sizeof(blob_T));
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26
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27 if (blob != NULL)
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28 ga_init2(&blob->bv_ga, 1, 100);
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29 return blob;
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30 }
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31
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32 /*
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33 * Allocate an empty blob for a return value, with reference count set.
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34 * Returns OK or FAIL.
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35 */
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36 int
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37 rettv_blob_alloc(typval_T *rettv)
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38 {
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39 blob_T *b = blob_alloc();
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40
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41 if (b == NULL)
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42 return FAIL;
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43
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44 rettv_blob_set(rettv, b);
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45 return OK;
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46 }
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47
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48 /*
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49 * Set a blob as the return value.
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50 */
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51 void
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52 rettv_blob_set(typval_T *rettv, blob_T *b)
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53 {
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54 rettv->v_type = VAR_BLOB;
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55 rettv->vval.v_blob = b;
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56 if (b != NULL)
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57 ++b->bv_refcount;
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58 }
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59
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60 void
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61 blob_free(blob_T *b)
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62 {
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63 ga_clear(&b->bv_ga);
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64 vim_free(b);
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65 }
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66
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67 /*
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68 * Unreference a blob: decrement the reference count and free it when it
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69 * becomes zero.
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70 */
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71 void
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72 blob_unref(blob_T *b)
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73 {
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74 if (b != NULL && --b->bv_refcount <= 0)
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75 blob_free(b);
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76 }
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77
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78 /*
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79 * Get the length of data.
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80 */
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81 long
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82 blob_len(blob_T *b)
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83 {
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84 if (b == NULL)
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85 return 0L;
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86 return b->bv_ga.ga_len;
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87 }
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88
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89 /*
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90 * Get byte "idx" in blob "b".
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91 * Caller must check that "idx" is valid.
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92 */
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93 char_u
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94 blob_get(blob_T *b, int idx)
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95 {
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96 return ((char_u*)b->bv_ga.ga_data)[idx];
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97 }
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98
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99 /*
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100 * Store one byte "c" in blob "b" at "idx".
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101 * Caller must make sure that "idx" is valid.
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102 */
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103 void
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104 blob_set(blob_T *b, int idx, char_u c)
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105 {
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106 ((char_u*)b->bv_ga.ga_data)[idx] = c;
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107 }
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108
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109 /*
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110 * Return TRUE when two blobs have exactly the same values.
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111 */
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112 int
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113 blob_equal(
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114 blob_T *b1,
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115 blob_T *b2)
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116 {
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117 int i;
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118 int len1 = blob_len(b1);
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119 int len2 = blob_len(b2);
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120
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121 // empty and NULL are considered the same
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122 if (len1 == 0 && len2 == 0)
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123 return TRUE;
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124 if (b1 == b2)
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125 return TRUE;
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126 if (len1 != len2)
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127 return FALSE;
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128
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129 for (i = 0; i < b1->bv_ga.ga_len; i++)
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130 if (blob_get(b1, i) != blob_get(b2, i)) return FALSE;
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131 return TRUE;
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132 }
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133
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134 /*
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135 * Read "blob" from file "fd".
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136 * Return OK or FAIL.
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137 */
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138 int
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139 read_blob(FILE *fd, blob_T *blob)
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140 {
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141 struct stat st;
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142
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143 if (fstat(fileno(fd), &st) < 0)
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144 return FAIL;
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145 if (ga_grow(&blob->bv_ga, st.st_size) == FAIL)
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146 return FAIL;
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147 blob->bv_ga.ga_len = st.st_size;
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148 if (fread(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
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149 < (size_t)blob->bv_ga.ga_len)
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150 return FAIL;
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151 return OK;
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152 }
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153
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154 /*
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155 * Write "blob" to file "fd".
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156 * Return OK or FAIL.
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157 */
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158 int
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159 write_blob(FILE *fd, blob_T *blob)
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160 {
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161 if (fwrite(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
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162 < (size_t)blob->bv_ga.ga_len)
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163 {
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164 EMSG(_(e_write));
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165 return FAIL;
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166 }
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167 return OK;
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168 }
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169
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170 #endif /* defined(FEAT_EVAL) */