1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | /* $Id: feResource.cc,v 1.1 1999-08-03 16:34:41 obachman Exp $ */ |
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5 | /* |
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6 | * ABSTRACT: management of resources |
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7 | */ |
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8 | |
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9 | #include <unistd.h> |
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10 | |
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11 | #include "mod2.h" |
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12 | #include "mmemory.h" |
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13 | #include "febase.h" |
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14 | |
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15 | // define RESOURCE_DEBUG for chattering about resource management |
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16 | // #define RESOURCE_DEBUG |
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17 | |
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18 | #if defined(MAKE_DISTRIBUTION) |
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19 | #if defined(WINNT) |
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20 | #define SINGULAR_DEFAULT_DIR "/Singular/"S_VERSION_1 |
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21 | #elif defined(macintosh) |
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22 | #define SINGULAR_DEFAULT_DIR "Macintosh HD:Singular:"S_VERSION1 |
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23 | #else // unix |
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24 | #define SINGULAR_DEFAULT_DIR "/usr/local/Singular/"S_VERSION1 |
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25 | #endif |
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26 | #else // ! defined(MAKE_DISTRIBUTION) |
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27 | #define SINGULAR_DEFAULT_DIR S_ROOT_DIR |
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28 | #endif // defined(MAKE_DISTRIBUTION) |
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29 | |
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30 | /***************************************************************** |
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31 | * |
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32 | * Declarations: Data structures |
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33 | * |
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34 | *****************************************************************/ |
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35 | typedef enum {feResUndef = 0, feResBinary, feResDir, feResFile, feResUrl, feResPath} feResourceType; |
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36 | |
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37 | typedef struct feResourceConfig_s |
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38 | { |
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39 | char* key; // key to identify resource |
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40 | char id; // char id to identify resource |
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41 | feResourceType type; // type of Resource |
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42 | char* env; // env variable to look for |
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43 | char* fmt; // format string -- see below for epxlaination |
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44 | char* value; // what it was set to |
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45 | } feResourceConfig_s; |
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46 | typedef feResourceConfig_s * feResourceConfig; |
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47 | |
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48 | // feSprintf transforms format strings as follows format string: |
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49 | // 1.) substrings of the form %c (c being a letter) are replaced by respective resource value |
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50 | // 2.) substrings of the form $string are replaced by value of resp. env variable |
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51 | |
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52 | // feCleanResource makes furthermore the following transformations (except for URL resources) |
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53 | // 1.) '/' characters are replaced by respective directory - separators |
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54 | // 2.) ';' characters are replaced by respective path separators |
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55 | static feResourceConfig_s feResourceConfigs[20] = |
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56 | { |
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57 | {"SearchPath", 's', feResPath, NULL, |
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58 | "$SINGULARPATH;" |
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59 | "%b/LIB;" |
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60 | "%r/LIB;" |
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61 | "%r/../LIB;" |
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62 | "%d/LIB;" |
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63 | "%d/../LIB" |
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64 | ""}, |
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65 | {"Singular", 'S', feResBinary,"SINGULAR_EXECUTABLE", "%d/"S_UNAME"/Singular",""}, |
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66 | {"BinDir", 'b', feResDir, "SINGULAR_BIN_DIR", "%d/"S_UNAME ""}, |
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67 | {"RootDir", 'r', feResDir, "SINGULAR_ROOT_DIR", "%b/..", ""}, |
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68 | {"DefaultDir",'d', feResDir, "SINGULAR_DEFAULT_DIR", NULL, SINGULAR_DEFAULT_DIR}, |
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69 | {"InfoFile", 'i', feResFile, "SINGULAR_INFO_FILE", "%r/info/singular.hlp", ""}, |
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70 | {"IdxFile", 'x', feResFile, "SINGULAR_IDX_FILE", "%r/doc/singular.idx", ""}, |
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71 | {"HtmlDir", 'h', feResDir, "SINGULAR_HTML_DIR", "%r/html", ""}, |
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72 | {"ManualUrl", 'u', feResUrl, "SINGULAR_URL", "http://www.mathematik.uni-kl.de/~zca/Singular/Manual/"S_VERSION1, ""}, |
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73 | {"EmacsDir", 'e', feResDir, "SINGULAR_EMACS_DIR", "%r/emacs", ""}, |
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74 | {"netscape", 'N', feResBinary,"NETSCAPE", "%b/netscape", ""}, |
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75 | {"info", 'I', feResBinary,"INFO", "%b/info", ""}, |
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76 | {"tkinfo", 'T', feResBinary,"TKINFO", "%b/tkinfo", ""}, |
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77 | {"xterm", 'X', feResBinary,"XTERM", "%b/xterm", ""}, |
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78 | {"Path", 'p', feResPath, NULL, "%b;$PATH", ""}, |
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79 | {NULL, 0, feResUndef, NULL, NULL, NULL}, // must be the last record |
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80 | }; |
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81 | |
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82 | |
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83 | /***************************************************************** |
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84 | * |
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85 | * Declarations: Local variables / functions |
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86 | * |
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87 | *****************************************************************/ |
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88 | static char* feArgv0; |
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89 | #define MAXRESOURCELEN 5*MAXPATHLEN |
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90 | char fePathSep = |
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91 | #if defined(WINNT) |
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92 | ';' |
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93 | #elif defined(macintosh) |
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94 | ',' |
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95 | #else |
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96 | ':' |
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97 | #endif |
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98 | ; |
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99 | |
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100 | static feResourceConfig feGetResourceConfig(const char id); |
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101 | static feResourceConfig feGetResourceConfig(const char* key); |
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102 | static char* feResource(feResourceConfig config, int warn); |
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103 | static char* feInitResource(feResourceConfig config, int warn); |
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104 | static char* feGetExpandedExecutable(); |
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105 | static BOOLEAN feVerifyResourceValue(feResourceType type, char* value); |
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106 | static char* feCleanResourceValue(feResourceType type, char* value); |
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107 | static char* feCleanUpFile(char* fname); |
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108 | static char* feCleanUpPath(char* path); |
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109 | static void mystrcpy(char* d, char* s); |
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110 | static char* feSprintf(char* s, const char* fmt); |
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111 | extern "C" char* find_executable(const char* argv0); |
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112 | #if defined(WINNT) && defined(__GNUC__) |
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113 | // utility function of Cygwin32: |
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114 | extern "C" int cygwin32_posix_path_list_p (const char *path); |
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115 | #endif |
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116 | |
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117 | /***************************************************************** |
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118 | * |
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119 | * Public functions |
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120 | * |
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121 | *****************************************************************/ |
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122 | char* feResource(const char id, int warn) |
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123 | { |
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124 | return feResource(feGetResourceConfig(id), warn); |
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125 | } |
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126 | |
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127 | char* feResource(const char* key, int warn) |
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128 | { |
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129 | return feResource(feGetResourceConfig(key), warn); |
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130 | } |
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131 | |
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132 | void feInitResources(char* argv0) |
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133 | { |
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134 | #if defined(WINNT) && defined(__GNUC__) |
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135 | if (cygwin32_posix_path_list_p (getenv("PATH"))) |
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136 | fePathSep = ':'; |
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137 | #endif |
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138 | feArgv0 = mstrdup(argv0); |
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139 | #ifdef RESOURCE_DEBUG |
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140 | printf("feInitResources: entering with argv0=%s=\n", argv0); |
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141 | feResource('S'); |
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142 | feResource('b'); |
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143 | feResource('r'); |
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144 | feResource('s'); |
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145 | #endif |
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146 | |
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147 | |
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148 | #ifdef HAVE_SETENV |
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149 | char* path = feResource('p'); |
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150 | #ifdef RESOURCE_DEBUG |
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151 | printf("feInitResources: setting path with argv0=%s=\n", path); |
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152 | #endif |
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153 | if (path != NULL) setenv("PATH", path, 1); |
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154 | #endif |
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155 | } |
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156 | |
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157 | |
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158 | /***************************************************************** |
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159 | * |
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160 | * Local functions |
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161 | * |
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162 | *****************************************************************/ |
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163 | static feResourceConfig feGetResourceConfig(const char id) |
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164 | { |
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165 | int i = 0; |
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166 | while (feResourceConfigs[i].key != NULL) |
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167 | { |
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168 | if (feResourceConfigs[i].id == id) return &(feResourceConfigs[i]); |
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169 | i++; |
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170 | } |
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171 | return NULL; |
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172 | } |
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173 | |
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174 | static feResourceConfig feGetResourceConfig(const char* key) |
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175 | { |
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176 | int i = 0; |
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177 | while (feResourceConfigs[i].key != NULL) |
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178 | { |
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179 | if (strcmp(feResourceConfigs[i].key, key) == 0) |
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180 | return &(feResourceConfigs[i]); |
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181 | i++; |
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182 | } |
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183 | return NULL; |
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184 | } |
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185 | |
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186 | static char* feResource(feResourceConfig config, int warn) |
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187 | { |
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188 | if (config == NULL) return NULL; |
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189 | if (config->value != NULL && *(config->value) != '\0') return config->value; |
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190 | return feInitResource(config, warn); |
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191 | } |
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192 | |
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193 | static char* feInitResource(feResourceConfig config, int warn) |
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194 | { |
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195 | assume(config != NULL); |
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196 | #ifdef RESOURCE_DEBUG |
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197 | printf("feInitResource: entering for %s\n", config->key); |
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198 | #endif |
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199 | |
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200 | char value[MAXRESOURCELEN]; |
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201 | // now we have to work |
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202 | // First, check Environment variable |
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203 | if (config->env != NULL) |
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204 | { |
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205 | char* evalue = getenv(config->env); |
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206 | if (evalue != NULL) |
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207 | { |
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208 | #ifdef RESOURCE_DEBUG |
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209 | printf("feInitResource: Found value from env:%s\n", evalue); |
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210 | #endif |
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211 | strcpy(value, evalue); |
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212 | if (feVerifyResourceValue(config->type, |
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213 | feCleanResourceValue(config->type, value))) |
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214 | { |
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215 | #ifdef RESOURCE_DEBUG |
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216 | printf("feInitResource: Set value of %s to =%s=\n", config->key, value); |
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217 | #endif |
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218 | config->value = mstrdup(value); |
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219 | return config->value; |
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220 | } |
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221 | } |
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222 | } |
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223 | |
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224 | *value = '\0'; |
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225 | // Special treatment of executable |
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226 | if (config->id == 'S') |
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227 | { |
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228 | char* executable = feGetExpandedExecutable(); |
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229 | if (executable != NULL) |
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230 | { |
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231 | strcpy(value, executable); |
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232 | FreeL(executable); |
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233 | } |
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234 | } |
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235 | // and bindir |
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236 | else if (config->id == 'b') |
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237 | { |
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238 | char* executable = feResource('S'); |
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239 | #ifdef RESOURCE_DEBUG |
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240 | printf("feInitResource: Get %s from %s\n", config->key, executable); |
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241 | #endif |
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242 | if (executable != NULL) |
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243 | { |
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244 | strcpy(value, executable); |
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245 | executable = strrchr(value, DIR_SEP); |
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246 | if (executable != NULL) *executable = '\0'; |
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247 | } |
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248 | } |
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249 | |
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250 | if (*value == '\0' && config->fmt != NULL ) |
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251 | { |
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252 | feSprintf(value, config->fmt); |
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253 | } |
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254 | else if (config->fmt == NULL) |
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255 | { |
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256 | sprintf(value, "Wrong Resource Specification of %s", config->key); |
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257 | feReportBug(value); |
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258 | return NULL; |
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259 | } |
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260 | |
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261 | // Clean and verify |
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262 | if (feVerifyResourceValue(config->type, |
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263 | feCleanResourceValue(config->type, value))) |
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264 | { |
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265 | #ifdef RESOURCE_DEBUG |
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266 | printf("feInitResource: Set value of %s to =%s=\n", config->key, value); |
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267 | #endif |
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268 | config->value = mstrdup(value); |
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269 | return config->value; |
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270 | } |
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271 | else if (config->type == feResBinary) |
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272 | { |
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273 | // for binaries, search through PATH once more |
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274 | char* executable = find_executable(config->key); |
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275 | if (executable != NULL) |
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276 | { |
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277 | config->value = strcpy(value, executable); |
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278 | FreeL(executable); |
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279 | if (feVerifyResourceValue(config->type, |
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280 | feCleanResourceValue(config->type, value))) |
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281 | { |
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282 | config->value = mstrdup(value); |
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283 | #ifdef RESOURCE_DEBUG |
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284 | printf("feInitResource: Set value of %s to =%s=\n", config->key, config->value); |
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285 | #endif |
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286 | return config->value; |
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287 | } |
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288 | } |
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289 | } |
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290 | |
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291 | // issue warning if explicitely requested, or if |
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292 | // this value is gotten for the first time |
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293 | if (warn > 0 || (warn < 0 && config->value != NULL)) |
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294 | { |
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295 | Warn("Could not get %s.", config->key); |
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296 | Warn("Either set environment variable %s to the location of %s", |
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297 | config->env, config->key); |
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298 | feSprintf(value, config->fmt); |
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299 | Warn("or make sure that %s is at %s", config->key, value); |
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300 | } |
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301 | #ifdef RESOURCE_DEBUG |
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302 | printf("feInitResource: Set value of %s to NULL", config->key); |
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303 | #endif |
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304 | config->value = NULL; |
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305 | return NULL; |
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306 | } |
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307 | |
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308 | static char* feGetExpandedExecutable() |
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309 | { |
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310 | if (feArgv0 == NULL || *feArgv0 == '\0') |
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311 | { |
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312 | if (feArgv0 == NULL) feReportBug("feArgv0 == NULL"); |
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313 | else feReportBug("feArgv0 == ''"); |
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314 | return NULL; |
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315 | } |
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316 | #ifndef macintosh |
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317 | #ifdef WINNT // stupid WINNT sometimes gives you argv[0] within "" |
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318 | if (*feArgv0 == '"') |
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319 | { |
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320 | int l = strlen(feArgv0); |
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321 | if (feArgv0[l-1] == '"') |
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322 | { |
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323 | feArgv0[l-1] = '\0'; |
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324 | feArgv0++; |
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325 | } |
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326 | } |
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327 | #endif |
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328 | #ifdef RESOURCE_DEBUG |
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329 | printf("feGetExpandedExecutable: calling find_exec with =%s=\n", feArgv0); |
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330 | #endif |
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331 | char* executable = find_executable(feArgv0); |
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332 | #ifdef RESOURCE_DEBUG |
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333 | printf("feGetExpandedExecutable: find_exec exited with =%s=\n", executable); |
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334 | #endif |
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335 | if (executable == NULL) |
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336 | { |
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337 | char message[MAXRESOURCELEN]; |
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338 | sprintf(message, "Could not get expanded executable from %s", feArgv0); |
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339 | feReportBug(message); |
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340 | return NULL; |
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341 | } |
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342 | return executable; |
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343 | #else // macintosh |
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344 | return feArgv0; |
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345 | #endif |
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346 | } |
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347 | |
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348 | |
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349 | static BOOLEAN feVerifyResourceValue(feResourceType type, char* value) |
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350 | { |
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351 | #ifdef RESOURCE_DEBUG |
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352 | printf("feVerifyResourceValue: entering with =%s=\n", value); |
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353 | #endif |
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354 | switch(type) |
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355 | { |
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356 | case feResUrl: |
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357 | case feResPath: |
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358 | return TRUE; |
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359 | |
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360 | case feResFile: |
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361 | return ! access(value, R_OK); |
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362 | |
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363 | case feResBinary: |
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364 | case feResDir: |
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365 | return ! access(value, X_OK); |
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366 | |
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367 | default: |
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368 | return FALSE; |
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369 | } |
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370 | } |
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371 | |
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372 | /***************************************************************** |
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373 | * |
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374 | * Cleaning/Transformations of resource values |
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375 | * |
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376 | *****************************************************************/ |
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377 | |
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378 | static char* feCleanResourceValue(feResourceType type, char* value) |
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379 | { |
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380 | if (value == NULL || *value == '\0') return value; |
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381 | #ifdef WINNT |
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382 | if (type == feResBinary) |
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383 | { |
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384 | int l = strlen(value); |
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385 | if (l < 4 || strcmp(&value[l-4], ".exe") != 0) |
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386 | strcat(value, ".exe"); |
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387 | } |
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388 | #endif |
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389 | if (type == feResFile || type == feResBinary || type == feResDir) |
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390 | return feCleanUpFile(value); |
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391 | if (type == feResPath) |
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392 | return feCleanUpPath(value); |
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393 | return value; |
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394 | } |
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395 | |
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396 | static char* feCleanUpFile(char* fname) |
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397 | { |
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398 | char* fn, *s; |
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399 | |
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400 | #ifdef RESOURCE_DEBUG |
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401 | printf("feCleanUpFile: entering with =%s=\n", fname); |
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402 | #endif |
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403 | // Remove unnecessary .. and // |
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404 | for (fn = fname; *fn != '\0'; fn++) |
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405 | { |
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406 | if (*fn == '/') |
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407 | { |
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408 | if (*(fn+1) == '\0') |
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409 | { |
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410 | if (fname != fn) *fn = '\0'; |
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411 | break; |
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412 | } |
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413 | if (*(fn + 1) == '/' && (fname != fn)) |
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414 | { |
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415 | mystrcpy(fn, fn+1); |
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416 | fn--; |
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417 | } |
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418 | else if (*(fn+1) == '.') |
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419 | { |
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420 | if (*(fn+2) == '.' && (*(fn + 3) == '/' || *(fn + 3) == '\0')) |
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421 | { |
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422 | *fn = '\0'; |
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423 | s = strrchr(fname, '/'); |
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424 | if (s != NULL) |
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425 | { |
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426 | mystrcpy(s+1, fn + (*(fn + 3) != '\0' ? 4 : 3)); |
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427 | fn = s-1; |
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428 | } |
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429 | else |
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430 | { |
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431 | *fn = '/'; |
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432 | } |
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433 | } |
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434 | else if (*(fn+2) == '/' || *(fn+2) == '\0') |
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435 | { |
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436 | mystrcpy(fn+1, fn+3); |
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437 | fn--; |
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438 | } |
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439 | } |
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440 | } |
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441 | } |
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442 | |
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443 | #ifdef macintosh |
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444 | // replace / and .. by DIR_SEP and UP_DIR |
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445 | fn = fname; |
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446 | while (*fn != NULL) |
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447 | { |
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448 | if (*fn == '.' && *(fn + 1) == '.') |
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449 | { |
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450 | mystrcpy(fn , fn + 2); |
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451 | } |
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452 | else |
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453 | { |
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454 | if (*fn == '/') *fn = DIR_SEP; |
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455 | fn++; |
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456 | } |
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457 | } |
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458 | #endif |
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459 | |
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460 | #ifdef RESOURCE_DEBUG |
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461 | printf("feCleanUpFile: leaving with =%s=\n", fname); |
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462 | #endif |
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463 | return fname; |
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464 | } |
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465 | |
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466 | // remove duplicates dir resp. those which do not exist |
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467 | static char* feCleanUpPath(char* path) |
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468 | { |
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469 | #ifdef RESOURCE_DEBUG |
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470 | printf("feCleanUpPath: entering with: =%s=\n", path); |
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471 | #endif |
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472 | if (path == NULL) return path; |
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473 | |
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474 | int n_comps = 1, i, j; |
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475 | char* opath = path; |
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476 | char** path_comps; |
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477 | |
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478 | for (; *path != '\0'; path++) |
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479 | { |
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480 | if (*path == fePathSep) n_comps++; |
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481 | if (*path == ';') |
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482 | { |
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483 | *path = fePathSep; |
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484 | n_comps++; |
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485 | } |
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486 | } |
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487 | |
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488 | path_comps = (char**) AllocL(n_comps*sizeof(char*)); |
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489 | path_comps[0]=opath; |
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490 | path=opath; |
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491 | i = 1; |
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492 | |
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493 | if (i < n_comps) |
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494 | { |
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495 | while (1) |
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496 | { |
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497 | if (*path == fePathSep) |
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498 | { |
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499 | *path = '\0'; |
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500 | path_comps[i] = path+1; |
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501 | i++; |
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502 | if (i == n_comps) break; |
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503 | } |
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504 | path++; |
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505 | } |
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506 | } |
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507 | |
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508 | for (i=0; i<n_comps; i++) |
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509 | path_comps[i] = feCleanUpFile(path_comps[i]); |
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510 | #ifdef RESOURCE_DEBUG |
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511 | PrintS("feCleanUpPath: fter CleanUpName: "); |
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512 | for (i=0; i<n_comps; i++) |
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513 | Print("%s:", path_comps[i]); |
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514 | Print("\n"); |
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515 | #endif |
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516 | |
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517 | for (i=0; i<n_comps;) |
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518 | { |
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519 | #ifdef RESOURCE_DEBUG |
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520 | if (access(path_comps[i], X_OK | R_OK)) |
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521 | Print("feCleanUpPath: remove %d:%s -- can not access\n", i, path_comps[i]); |
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522 | #endif |
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523 | if ( ! access(path_comps[i], X_OK | R_OK)) |
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524 | { |
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525 | // x- permission is granted -- we assume that it is a dir |
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526 | for (j=0; j<i; j++) |
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527 | { |
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528 | if (strcmp(path_comps[j], path_comps[i]) == 0) |
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529 | { |
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530 | // found a duplicate |
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531 | #ifdef RESOURCE_DEBUG |
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532 | Print("feCleanUpPath: remove %d:%s -- equal to %d:%s\n", j, path_comps[j], i, path_comps[i]); |
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533 | #endif |
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534 | j = i+1; |
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535 | break; |
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536 | } |
---|
537 | } |
---|
538 | if (j == i) |
---|
539 | { |
---|
540 | i++; |
---|
541 | continue; |
---|
542 | } |
---|
543 | } |
---|
544 | // now we can either not access or found a duplicate |
---|
545 | path_comps[i] = NULL; |
---|
546 | for (j=i+1; j<n_comps; j++) |
---|
547 | path_comps[j-1] = path_comps[j]; |
---|
548 | n_comps--; |
---|
549 | } |
---|
550 | |
---|
551 | // assemble everything again |
---|
552 | for (path=opath, i=0;i<n_comps-1;i++) |
---|
553 | { |
---|
554 | strcpy(path, path_comps[i]); |
---|
555 | path += strlen(path); |
---|
556 | *path = fePathSep; |
---|
557 | path++; |
---|
558 | } |
---|
559 | if (n_comps) strcpy(path, path_comps[i]); |
---|
560 | FreeL(path_comps); |
---|
561 | #ifdef RESOURCE_DEBUG |
---|
562 | Print("feCleanUpPath: leaving with path=%s=\n", opath); |
---|
563 | #endif |
---|
564 | return opath; |
---|
565 | } |
---|
566 | |
---|
567 | // strcpy where source and destination may overlap |
---|
568 | static void mystrcpy(char* d, char* s) |
---|
569 | { |
---|
570 | assume(d != NULL && s != NULL); |
---|
571 | while (*s != '\0') |
---|
572 | { |
---|
573 | *d = *s; |
---|
574 | d++; |
---|
575 | s++; |
---|
576 | } |
---|
577 | *d = '\0'; |
---|
578 | } |
---|
579 | |
---|
580 | /***************************************************************** |
---|
581 | * |
---|
582 | * feSprintf |
---|
583 | * |
---|
584 | *****************************************************************/ |
---|
585 | static char* feSprintf(char* s, const char* fmt) |
---|
586 | { |
---|
587 | char* s_in = s; |
---|
588 | if (fmt == NULL) return NULL; |
---|
589 | |
---|
590 | while (*fmt != '\0') |
---|
591 | { |
---|
592 | *s = *fmt; |
---|
593 | |
---|
594 | if (*fmt == '%' && *(fmt + 1) != '\0') |
---|
595 | { |
---|
596 | fmt++; |
---|
597 | char* r = feResource(*fmt); |
---|
598 | if (r != NULL) |
---|
599 | { |
---|
600 | strcpy(s, r); |
---|
601 | s += strlen(r) - 1; |
---|
602 | } |
---|
603 | else |
---|
604 | { |
---|
605 | s++; |
---|
606 | *s = *fmt; |
---|
607 | } |
---|
608 | } |
---|
609 | else if (*fmt == '$' && *(fmt + 1) != '\0') |
---|
610 | { |
---|
611 | fmt++; |
---|
612 | char* v = s + 1; |
---|
613 | while (*fmt == '_' || |
---|
614 | (*fmt >= 'A' && *fmt <= 'Z') || |
---|
615 | (*fmt >= 'a' && *fmt <= 'z')) |
---|
616 | { |
---|
617 | *v = *fmt; |
---|
618 | v++; |
---|
619 | fmt++; |
---|
620 | } |
---|
621 | fmt--; |
---|
622 | *v = '\0'; |
---|
623 | v = getenv(s + 1); |
---|
624 | if (v != NULL) strcpy(s, v); |
---|
625 | s += strlen(s) - 1; |
---|
626 | } |
---|
627 | s++; |
---|
628 | fmt++; |
---|
629 | } |
---|
630 | *s = '\0'; |
---|
631 | return s_in; |
---|
632 | } |
---|
633 | |
---|
634 | void feStringAppendResources() |
---|
635 | { |
---|
636 | int i = 0; |
---|
637 | while (feResourceConfigs[i].key != NULL) |
---|
638 | { |
---|
639 | StringAppend("%-10s:\t%s\n", feResourceConfigs[i].key, |
---|
640 | feResource(feResourceConfigs[i].key)); |
---|
641 | i++; |
---|
642 | } |
---|
643 | } |
---|
644 | |
---|
645 | |
---|
646 | |
---|
647 | |
---|