3 #include "_PDCLIB_int.h"
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4 #include "_PDCLIB_threadconfig.h"
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6 /* PDCLib internal I/O logic <_PDCLIB_int.h>
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8 This file is part of the Public Domain C Library (PDCLib).
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9 Permission is granted to use, modify, and / or redistribute at will.
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12 /* Flags for representing mode (see fopen()). Note these must fit the same
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13 status field as the _IO?BF flags in <stdio.h> and the internal flags below.
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15 #define _PDCLIB_FREAD 8u
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16 #define _PDCLIB_FWRITE 16u
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17 #define _PDCLIB_FAPPEND 32u
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18 #define _PDCLIB_FRW 64u
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19 #define _PDCLIB_FBIN 128u
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21 /* Internal flags, made to fit the same status field as the flags above. */
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22 /* -------------------------------------------------------------------------- */
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23 /* free() the buffer memory on closing (false for user-supplied buffer) */
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24 #define _PDCLIB_FREEBUFFER 512u
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25 /* stream has encountered error / EOF */
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26 #define _PDCLIB_ERRORFLAG 1024u
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27 #define _PDCLIB_EOFFLAG 2048u
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28 /* stream is wide-oriented */
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29 #define _PDCLIB_WIDESTREAM 4096u
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30 /* stream is byte-oriented */
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31 #define _PDCLIB_BYTESTREAM 8192u
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32 /* file associated with stream should be remove()d on closing (tmpfile()) */
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33 #define _PDCLIB_DELONCLOSE 16384u
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34 /* stream handle should not be free()d on close (stdin, stdout, stderr) */
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35 #define _PDCLIB_STATIC 32768u
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37 typedef union _PDCLIB_fd
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39 #if defined(_PDCLIB_OSFD_T)
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40 _PDCLIB_OSFD_T osfd;
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43 _PDCLIB_uintptr_t uval;
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44 _PDCLIB_intptr_t sval;
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47 /* Internal functions */
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48 /* Writes a stream's buffer.
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49 Returns 0 on success, EOF on write error.
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50 Sets stream error flags and errno appropriately on error.
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52 int _PDCLIB_flushbuffer( struct _PDCLIB_file_t * stream );
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54 /* Fills a stream's buffer.
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55 Returns 0 on success, EOF on read error / EOF.
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56 Sets stream EOF / error flags and errno appropriately on error.
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58 int _PDCLIB_fillbuffer( struct _PDCLIB_file_t * stream );
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60 /* Repositions within a file. Returns new offset on success,
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61 -1 / errno on error.
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63 _PDCLIB_int_fast64_t _PDCLIB_seek( struct _PDCLIB_file_t * stream,
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64 _PDCLIB_int_fast64_t offset, int whence );
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66 /* File backend I/O operations
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68 * PDCLib will call through to these methods as needed to implement the stdio
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71 typedef struct _PDCLIB_fileops
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73 /*! Read length bytes from the file into buf; returning the number of bytes
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74 * actually read in *numBytesRead.
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76 * Returns true if bytes were read successfully; on end of file, returns
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77 * true with *numBytesRead == 0.
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79 * On error, returns false and sets errno appropriately. *numBytesRead is
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80 * ignored in this situation.
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82 _PDCLIB_bool (*read)( _PDCLIB_fd_t self,
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84 _PDCLIB_size_t length,
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85 _PDCLIB_size_t * numBytesRead );
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87 /*! Write length bytes to the file from buf; returning the number of bytes
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88 * actually written in *numBytesWritten
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90 * Returns true if bytes were written successfully. On error, returns false
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91 * and setss errno appropriately (as with read, *numBytesWritten is
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94 _PDCLIB_bool (*write)( _PDCLIB_fd_t self, const void * buf,
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95 _PDCLIB_size_t length, _PDCLIB_size_t * numBytesWritten );
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97 /* Seek to the file offset specified by offset, from location whence, which
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98 * may be one of the standard constants SEEK_SET/SEEK_CUR/SEEK_END
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100 _PDCLIB_bool (*seek)( _PDCLIB_fd_t self, _PDCLIB_int_fast64_t offset,
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101 int whence, _PDCLIB_int_fast64_t *newPos );
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103 void (*close)( _PDCLIB_fd_t self );
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105 /*! Behaves as read does, except for wide characters. Both length and
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106 * *numCharsRead represent counts of characters, not bytes.
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108 * This function is optional; if missing, PDCLib will buffer the character
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109 * data as bytes and perform translation directly into the user's buffers.
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110 * It is useful if your backend can directly take wide characters (for
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111 * example, the Windows console)
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113 _PDCLIB_bool (*wread)( _PDCLIB_fd_t self, _PDCLIB_wchar_t * buf,
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114 _PDCLIB_size_t length, _PDCLIB_size_t * numCharsRead );
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116 /* Behaves as write does, except for wide characters. As with wread, both
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117 * length and *numCharsWritten are character counts.
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119 * This function is also optional; if missing, PDCLib will buffer the
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120 * character data as bytes and do translation directly from the user's
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121 * buffers. You only need to implement this if your backend can directly
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122 * take wide characters (for example, the Windows console)
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124 _PDCLIB_bool (*wwrite)( _PDCLIB_fd_t self, const _PDCLIB_wchar_t * buf,
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125 _PDCLIB_size_t length, _PDCLIB_size_t * numCharsWritten );
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126 } _PDCLIB_fileops_t;
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128 /* Position / status structure for getpos() / fsetpos(). */
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129 struct _PDCLIB_fpos_t
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131 _PDCLIB_int_fast64_t offset; /* File position offset */
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132 int status; /* Multibyte parsing state (unused, reserved) */
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135 /* FILE structure */
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136 struct _PDCLIB_file_t
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138 const _PDCLIB_fileops_t * ops;
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139 _PDCLIB_fd_t handle; /* OS file handle */
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140 _PDCLIB_MTX_T lock; /* file lock */
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141 char * buffer; /* Pointer to buffer memory */
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142 _PDCLIB_size_t bufsize; /* Size of buffer */
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143 _PDCLIB_size_t bufidx; /* Index of current position in buffer */
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144 _PDCLIB_size_t bufend; /* Index of last pre-read character in buffer */
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145 struct _PDCLIB_fpos_t pos; /* Offset and multibyte parsing state */
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146 _PDCLIB_size_t ungetidx; /* Number of ungetc()'ed characters */
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147 unsigned char * ungetbuf; /* ungetc() buffer */
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148 unsigned int status; /* Status flags; see above */
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149 /* multibyte parsing status to be added later */
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150 char * filename; /* Name the current stream has been opened with */
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151 struct _PDCLIB_file_t * next; /* Pointer to next struct (internal) */
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154 static inline _PDCLIB_size_t _PDCLIB_getchars( char * out, _PDCLIB_size_t n,
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156 struct _PDCLIB_file_t * stream )
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158 _PDCLIB_size_t i = 0;
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160 while ( stream->ungetidx > 0 && i != n )
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162 c = (unsigned char)
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163 ( out[ i++ ] = stream->ungetbuf[ --(stream->ungetidx) ] );
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164 if( c == stopchar )
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170 while ( stream->bufidx != stream->bufend && i != n)
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172 c = (unsigned char)
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173 ( out[ i++ ] = stream->buffer[ stream->bufidx++ ] );
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174 if( c == stopchar )
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178 if ( stream->bufidx == stream->bufend )
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180 if( _PDCLIB_fillbuffer( stream ) == -1 )
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