1 | /*
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2 | * split-include.c
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3 | *
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4 | * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
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5 | * This is a C version of syncdep.pl by Werner Almesberger.
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6 | *
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7 | * This program takes autoconf.h as input and outputs a directory full
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8 | * of one-line include files, merging onto the old values.
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9 | *
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10 | * Think of the configuration options as key-value pairs. Then there
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11 | * are five cases:
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12 | *
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13 | * key old value new value action
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14 | *
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15 | * KEY-1 VALUE-1 VALUE-1 leave file alone
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16 | * KEY-2 VALUE-2A VALUE-2B write VALUE-2B into file
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17 | * KEY-3 - VALUE-3 write VALUE-3 into file
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18 | * KEY-4 VALUE-4 - write an empty file
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19 | * KEY-5 (empty) - leave old empty file alone
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20 | */
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21 |
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22 | #include <sys/stat.h>
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23 | #include <sys/types.h>
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24 |
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25 | #include <ctype.h>
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26 | #include <errno.h>
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27 | #include <fcntl.h>
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28 | #include <stdio.h>
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29 | #include <stdlib.h>
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30 | #include <string.h>
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31 | #include <unistd.h>
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32 |
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33 | #define ERROR_EXIT(strExit) \
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34 | { \
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35 | const int errnoSave = errno; \
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36 | fprintf(stderr, "%s: ", str_my_name); \
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37 | errno = errnoSave; \
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38 | perror((strExit)); \
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39 | exit(1); \
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40 | }
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41 |
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42 |
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43 |
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44 | int main(int argc, const char * argv [])
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45 | {
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46 | const char * str_my_name;
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47 | const char * str_file_autoconf;
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48 | const char * str_dir_config;
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49 |
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50 | FILE * fp_config;
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51 | FILE * fp_target;
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52 | FILE * fp_find;
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53 |
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54 | int buffer_size;
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55 |
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56 | char * line;
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57 | char * old_line;
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58 | char * list_target;
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59 | char * ptarget;
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60 |
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61 | struct stat stat_buf;
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62 |
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63 | /* Check arg count. */
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64 | if (argc != 3)
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65 | {
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66 | fprintf(stderr, "%s: wrong number of arguments.\n", argv[0]);
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67 | exit(1);
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68 | }
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69 |
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70 | str_my_name = argv[0];
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71 | str_file_autoconf = argv[1];
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72 | str_dir_config = argv[2];
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73 |
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74 | /* Find a buffer size. */
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75 | if (stat(str_file_autoconf, &stat_buf) != 0)
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76 | ERROR_EXIT(str_file_autoconf);
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77 | buffer_size = 2 * stat_buf.st_size + 4096;
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78 |
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79 | /* Allocate buffers. */
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80 | if ( (line = malloc(buffer_size)) == NULL
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81 | || (old_line = malloc(buffer_size)) == NULL
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82 | || (list_target = malloc(buffer_size)) == NULL )
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83 | ERROR_EXIT(str_file_autoconf);
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84 |
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85 | /* Open autoconfig file. */
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86 | if ((fp_config = fopen(str_file_autoconf, "r")) == NULL)
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87 | ERROR_EXIT(str_file_autoconf);
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88 |
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89 | /* Make output directory if needed. */
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90 | if (stat(str_dir_config, &stat_buf) != 0)
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91 | {
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92 | if (mkdir(str_dir_config, 0755) != 0)
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93 | ERROR_EXIT(str_dir_config);
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94 | }
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95 |
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96 | /* Change to output directory. */
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97 | if (chdir(str_dir_config) != 0)
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98 | ERROR_EXIT(str_dir_config);
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99 |
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100 | /* Put initial separator into target list. */
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101 | ptarget = list_target;
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102 | *ptarget++ = '\n';
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103 |
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104 | /* Read config lines. */
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105 | while (fgets(line, buffer_size, fp_config))
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106 | {
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107 | const char * str_config;
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108 | int is_same;
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109 | int itarget;
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110 |
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111 | if (line[0] != '#')
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112 | continue;
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113 | if ((str_config = strstr(line, " CONFIG_")) == NULL)
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114 | continue;
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115 |
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116 | /* We found #define CONFIG_foo or #undef CONFIG_foo.
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117 | * Make the output file name. */
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118 | str_config += sizeof(" CONFIG_") - 1;
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119 | for (itarget = 0; !isspace(str_config[itarget]); itarget++)
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120 | {
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121 | int c = (unsigned char) str_config[itarget];
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122 | if (isupper(c)) c = tolower(c);
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123 | if (c == '_') c = '/';
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124 | ptarget[itarget] = c;
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125 | }
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126 | ptarget[itarget++] = '.';
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127 | ptarget[itarget++] = 'h';
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128 | ptarget[itarget++] = '\0';
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129 |
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130 | /* Check for existing file. */
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131 | is_same = 0;
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132 | if ((fp_target = fopen(ptarget, "r")) != NULL)
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133 | {
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134 | fgets(old_line, buffer_size, fp_target);
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135 | if (fclose(fp_target) != 0)
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136 | ERROR_EXIT(ptarget);
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137 | if (!strcmp(line, old_line))
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138 | is_same = 1;
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139 | }
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140 |
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141 | if (!is_same)
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142 | {
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143 | /* Auto-create directories. */
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144 | int islash;
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145 | for (islash = 0; islash < itarget; islash++)
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146 | {
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147 | if (ptarget[islash] == '/')
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148 | {
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149 | ptarget[islash] = '\0';
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150 | if (stat(ptarget, &stat_buf) != 0
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151 | && mkdir(ptarget, 0755) != 0)
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152 | ERROR_EXIT( ptarget );
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153 | ptarget[islash] = '/';
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154 | }
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155 | }
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156 |
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157 | /* Write the file. */
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158 | if ((fp_target = fopen(ptarget, "w")) == NULL)
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159 | ERROR_EXIT(ptarget);
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160 | fputs(line, fp_target);
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161 | if (ferror(fp_target) || fclose(fp_target) != 0)
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162 | ERROR_EXIT(ptarget);
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163 | }
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164 |
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165 | /* Update target list */
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166 | ptarget += itarget;
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167 | *(ptarget-1) = '\n';
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168 | }
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169 |
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170 | /*
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171 | * Close autoconfig file.
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172 | * Terminate the target list.
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173 | */
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174 | if (fclose(fp_config) != 0)
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175 | ERROR_EXIT(str_file_autoconf);
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176 | *ptarget = '\0';
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177 |
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178 | /*
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179 | * Fix up existing files which have no new value.
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180 | * This is Case 4 and Case 5.
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181 | *
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182 | * I re-read the tree and filter it against list_target.
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183 | * This is crude. But it avoids data copies. Also, list_target
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184 | * is compact and contiguous, so it easily fits into cache.
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185 | *
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186 | * Notice that list_target contains strings separated by \n,
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187 | * with a \n before the first string and after the last.
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188 | * fgets gives the incoming names a terminating \n.
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189 | * So by having an initial \n, strstr will find exact matches.
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190 | */
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191 |
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192 | fp_find = popen("find * -type f -name \"*.h\" -print", "r");
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193 | if (fp_find == 0)
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194 | ERROR_EXIT( "find" );
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195 |
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196 | line[0] = '\n';
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197 | while (fgets(line+1, buffer_size, fp_find))
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198 | {
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199 | if (strstr(list_target, line) == NULL)
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200 | {
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201 | /*
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202 | * This is an old file with no CONFIG_* flag in autoconf.h.
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203 | */
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204 |
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205 | /* First strip the \n. */
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206 | line[strlen(line)-1] = '\0';
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207 |
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208 | /* Grab size. */
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209 | if (stat(line+1, &stat_buf) != 0)
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210 | ERROR_EXIT(line);
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211 |
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212 | /* If file is not empty, make it empty and give it a fresh date. */
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213 | if (stat_buf.st_size != 0)
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214 | {
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215 | if ((fp_target = fopen(line+1, "w")) == NULL)
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216 | ERROR_EXIT(line);
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217 | if (fclose(fp_target) != 0)
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218 | ERROR_EXIT(line);
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219 | }
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220 | }
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221 | }
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222 |
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223 | if (pclose(fp_find) != 0)
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224 | ERROR_EXIT("find");
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225 |
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226 | return 0;
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227 | }
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