libcm is a C development framework with an emphasis on audio signal processing applications.
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cmFileSys.h 11KB

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  1. //{
  2. //(
  3. // A collection of file system utility functions.
  4. //
  5. // Note that cmFileSysInitialize() creates an internal cmLHeapH_t based
  6. // heap manager from which it allocates memory for some returned objects.
  7. // (e.g. cmFileSysMakeFn(), cmFileSysPathParts(), cmFileSysDirEntries())
  8. // Where possible the client can explicitely free these objects via the
  9. // provided functions. (e.g. cmFileSysFreeFn(), cmFileSysFreePathParts(), cmFileSysDirFreeEntries())
  10. // However if these objects are not free they will be automatically deallocated
  11. // when the internal heap is destroyed by cmFileSysFinalize().
  12. //
  13. //)
  14. #ifndef cmFileSys_h
  15. #define cmFileSys_h
  16. #ifdef __cplusplus
  17. extern "C" {
  18. #endif
  19. //(
  20. // Result codes returned by cmFileSys.h functions
  21. enum
  22. {
  23. kOkFsRC = cmOkRC,
  24. kMemAllocErrFsRC,
  25. kLHeapAllocErrFsRC,
  26. kStatFailFsRC,
  27. kAssertFailFsRC,
  28. kOpenDirFailFsRC,
  29. kFnTooLongFsRC,
  30. kMkDirFailFsRC,
  31. kSysErrFsRC,
  32. kOsxFailFsRC,
  33. kLinuxFailFsRC,
  34. kInvalidDirFsRC,
  35. kGenFileFailFsRC
  36. };
  37. typedef cmHandle_t cmFileSysH_t; //< Opaque handle type used by all cmFileSys.h functions
  38. typedef unsigned cmFsRC_t; //< Result code used as the return type by many cmFileSys.h functions.
  39. extern cmFileSysH_t cmFileSysNullHandle; // NULL handle to be used for setting cmFileSysH_t type handles to an explicit uninitialized value.
  40. // Initialize a file system object.
  41. // If *hp was not initalized by an earlier call to cmFileSysInitialize() then it should
  42. // be set to cmFileSysNullHandle prior to calling this function. If *hp is a valid handle
  43. // then it is automatically finalized by an internal call to cmFileSysFinalize() prior to
  44. // being re-iniitalized.
  45. // The appNameStr is used to determine the location of the preference and resource directories
  46. // on some platforms
  47. cmFsRC_t cmFileSysInitialize( cmFileSysH_t* hp, cmCtx_t* ctx, const cmChar_t* appNameStr );
  48. // Finalize a file system object.
  49. // Upon successful completion *hp is set to cmFileSysNullHandle.
  50. cmFsRC_t cmFileSysFinalize( cmFileSysH_t* hp );
  51. // Returns true if the file system handle is active and initialized.
  52. bool cmFileSysIsValid( cmFileSysH_t h );
  53. const cmChar_t* cmFileSysAppName( cmFileSysH_t h ); //< Return the application name as passed to cmFileSysInitialize()
  54. const cmChar_t* cmFileSysPrefsDir( cmFileSysH_t h ); //< Return the operating system dependent preference data directory for this application.
  55. const cmChar_t* cmFileSysRsrcDir( cmFileSysH_t h ); //< Return the operating system dependent application resource directory for this application.
  56. const cmChar_t* cmFileSysUserDir( cmFileSysH_t h ); //< Return the operating system dependent user directory for this application.
  57. // Test the type of a file system object:
  58. //
  59. bool cmFileSysIsDir( cmFileSysH_t h, const cmChar_t* dirStr ); //< Return true if 'dirStr' refers to an existing directory.
  60. bool cmFileSysIsFile( cmFileSysH_t h, const cmChar_t* fnStr ); //< Return true if 'fnStr' refers to an existing file.
  61. bool cmFileSysIsLink( cmFileSysH_t h, const cmChar_t* fnStr ); //< Return true if 'fnStr' refers to a symbolic link.
  62. // Create File Names:
  63. //
  64. // Create a file name by concatenating sub-strings.
  65. //
  66. // Variable arg's. entries are directories inserted between
  67. // 'dirPrefixStr' and the file name.
  68. // Terminate var arg's directory list with a NULL.
  69. //
  70. // The returned string is allocated in a local heap maintained by the cmFileSys object.
  71. // The memory used by the string will exist until it is released with cmFileSysFreeFn()
  72. // or the cmFileSys object is finalized.
  73. const cmChar_t* cmFileSysMakeFn( cmFileSysH_t h, const cmChar_t* dirPrefix, const cmChar_t* fn, const cmChar_t* ext, ... );
  74. // Same as cmFileSysMakeFn with but with a va_list argument to accept the var. args. parameters.
  75. const cmChar_t* cmFileSysVMakeFn( cmFileSysH_t h, const cmChar_t* dirPrefix, const cmChar_t* fn, const cmChar_t* ext, va_list vl );
  76. // Release the file name created through an earlier call to cmFileSysMakeFn().
  77. void cmFileSysFreeFn( cmFileSysH_t h, const cmChar_t* fn );
  78. // Generate an unused filename in the directory 'dir' beginning with the prefix 'prefixStr'.
  79. // The returned file name will have the format: <dir>/<prefixStr>nnnn.<extStr> where
  80. // nnn represents 1 or more digits. The returned string must be released with a
  81. // call to cmMemFree().
  82. cmFsRC_t cmFileSysGenFn( cmFileSysH_t h, const cmChar_t* dir, const cmChar_t* prefixStr, const cmChar_t* extStr, const cmChar_t** fnPtr );
  83. // Create a directory - where the entire path already exists except for the
  84. // final directory.
  85. cmFsRC_t cmFileSysMkDir( cmFileSysH_t h, const cmChar_t* dir );
  86. // Create a complete directory path - where any of the path segments may
  87. // not already exist.
  88. cmFsRC_t cmFileSysMkDirAll( cmFileSysH_t h, const cmChar_t* dir );
  89. // Parse a path into its parts:
  90. //
  91. // Return record used by cmFileSysParts()
  92. typedef struct
  93. {
  94. const cmChar_t* dirStr;
  95. const cmChar_t* fnStr;
  96. const cmChar_t* extStr;
  97. } cmFileSysPathPart_t;
  98. // Given a file name decompose it into a directory string, file name string and file extension string.
  99. // The cmFileSysPathPart_t record and the memory used by the strings that it references
  100. // are allocated from a local heap maintained by the cmFileSys object. This memory will exist
  101. // until it is released with cmFileSysFreePathParts() or the cmFileSysH_t handle is finalized.
  102. cmFileSysPathPart_t* cmFileSysPathParts( cmFileSysH_t h, const cmChar_t* pathNameStr );
  103. // Free the memory associated with a cmFileSysPathPart_t record returned from an eariler call to cmFileSysPathParts().
  104. void cmFileSysFreePathParts( cmFileSysH_t h, cmFileSysPathPart_t* p );
  105. // Return the parts of a directory path as an array of strings.
  106. // The last element in the array is set to NULL to mark the end of the array.
  107. // Note that all '/' separator characters are removed from the result with
  108. // the exception of the first one - which denotes the root directory.
  109. // The returned array is allocated from the file systems internal heap and will
  110. // be automatically released when the file system is closed by cmFileSysDestroy().
  111. // The caller may optionally release the array memory with a call to
  112. // cmFileSysFreeDirParts().
  113. cmChar_t** cmFileSysDirParts( cmFileSysH_t h, const cmChar_t* dirStr );
  114. void cmFileSysFreeDirParts( cmFileSysH_t h, cmChar_t** dirStrArray );
  115. // Return the count of elements in a directory parts array as returned by
  116. // cmFileSysDirParts().
  117. unsigned cmFileSysDirPartsCount(cmFileSysH_t h, cmChar_t** dirStrArray );
  118. // Form a directory string from a NULL terminated array of strings.
  119. // If the first element in the array is set to '/' then the
  120. // resulting directory will be absolute rather than relative.
  121. // The returned string is allocated from the file systems internal heap and will
  122. // be automatically released when the file system is closed by cmFileSysDestroy().
  123. // The caller may optionally release the array memory with a call to
  124. // cmFileSysFreeDir().
  125. cmChar_t* cmFileSysFormDir( cmFileSysH_t h, cmChar_t** dirStrArray, unsigned n );
  126. void cmFileSysFreeDir( cmFileSysH_t h, const cmChar_t* dir );
  127. // Walk a directory tree:
  128. //
  129. // Flags used by cmFileSysDirEntries 'includeFlags' parameter.
  130. enum
  131. {
  132. kFileFsFl = 0x001, //< include all visible files
  133. kDirFsFl = 0x002, //< include all visible directory
  134. kLinkFsFl = 0x004, //< include all symbolic links
  135. kInvisibleFsFl = 0x008, //< include file/dir name beginning with a '.'
  136. kCurDirFsFl = 0x010, //< include '.' directory
  137. kParentDirFsFl = 0x020, //< include '..' directory
  138. kAllFsFl = 0x02f, //< all type flags
  139. kFullPathFsFl = 0x040, //< return the full path in the 'name' field of cmFileSysDirEntry_t;
  140. kRecurseFsFl = 0x080, //< recurse into directories
  141. kRecurseLinksFsFl = 0x100 //< recurse into symbol link directories
  142. };
  143. // The return type for cmFileSysDirEntries().
  144. typedef struct
  145. {
  146. unsigned flags; //< Entry type flags from kXXXFsFl.
  147. const cmChar_t* name; //< Entry name or full path depending on kFullPathFsFl.
  148. } cmFileSysDirEntry_t;
  149. // Return the file and directory names contained in a given subdirectory.
  150. //
  151. // Set 'includeFlags' with the kXXXFsFl flags of the files to include in the returned
  152. // directory entry array. The value pointed to by dirEntryCntPtr will be set to the
  153. // number of records in the returned array.
  154. cmFileSysDirEntry_t* cmFileSysDirEntries( cmFileSysH_t h, const cmChar_t* dirStr, unsigned includeFlags, unsigned* dirEntryCntPtr );
  155. // Release the memory assoicated with a cmFileSysDirEntry_t array returned from an earlier call to cmFileSysDirEntries().
  156. void cmFileSysDirFreeEntries( cmFileSysH_t h, cmFileSysDirEntry_t* p );
  157. // Return the last error code generated by the file system.
  158. cmFsRC_t cmFileSysErrorCode( cmFileSysH_t h );
  159. //-------------------------------------------------------------------------------------------------
  160. // Global file system functions:
  161. // These functions work using a global cmFileSysH created by cmFsInitialize().
  162. // The functions are otherwise just wrappers for the same named function above.
  163. cmFsRC_t cmFsInitialize( cmCtx_t* ctx, const cmChar_t* appNameStr );
  164. cmFsRC_t cmFsFinalize();
  165. const cmChar_t* cmFsAppName();
  166. const cmChar_t* cmFsPrefsDir();
  167. const cmChar_t* cmFsRsrcDir();
  168. const cmChar_t* cmFsUserDir();
  169. bool cmFsIsDir( const cmChar_t* dirStr );
  170. bool cmFsIsFile( const cmChar_t* fnStr );
  171. bool cmFsIsLink( const cmChar_t* fnStr );
  172. const cmChar_t* cmFsVMakeFn( const cmChar_t* dirPrefix, const cmChar_t* fn, const cmChar_t* ext, va_list vl );
  173. const cmChar_t* cmFsMakeFn( const cmChar_t* dirPrefix, const cmChar_t* fn, const cmChar_t* ext, ... );
  174. void cmFsFreeFn( const cmChar_t* fn );
  175. cmFsRC_t cmFsGenFn( const cmChar_t* dir, const cmChar_t* prefixStr, const cmChar_t* extStr, const cmChar_t** fnPtr );
  176. cmFsRC_t cmFsMkDir( const cmChar_t* dir );
  177. cmFsRC_t cmFsMkDirAll( const cmChar_t* dir );
  178. cmFileSysPathPart_t* cmFsPathParts( const cmChar_t* pathNameStr );
  179. void cmFsFreePathParts( cmFileSysPathPart_t* p );
  180. cmChar_t** cmFsDirParts( const cmChar_t* dirStr );
  181. void cmFsFreeDirParts( cmChar_t** dirStrArray );
  182. unsigned cmFsDirPartsCount( cmChar_t** dirStrArray );
  183. cmChar_t* cmFsFormDir( cmChar_t** dirStrArray, unsigned n );
  184. void cmFsFreeDir( const cmChar_t* dir );
  185. cmFileSysDirEntry_t* cmFsDirEntries( const cmChar_t* dirStr, unsigned includeFlags, unsigned* dirEntryCntPtr );
  186. void cmFsDirFreeEntries( cmFileSysDirEntry_t* p );
  187. cmFsRC_t cmFsErrorCode();
  188. // Test and example function to demonstrate the use of the functions in cmFileSys.h
  189. cmFsRC_t cmFileSysTest( cmCtx_t* ctx );
  190. //)
  191. //}
  192. #ifdef __cplusplus
  193. }
  194. #endif
  195. #endif