2 * AcessOS Basic C Library
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6 #include <acess/sys.h>
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11 #include "stdio_int.h"
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15 #define DEBUG_BUILD 0
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17 // === CONSTANTS ===
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21 #define FD_NOTOPEN -1
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22 #define FD_MEMFILE -2
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23 #define FD_MEMSTREAM -3
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25 // === PROTOTYPES ===
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26 struct sFILE *get_file_struct();
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29 struct sFILE _iob[STDIO_MAX_STREAMS]; // IO Buffer
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30 struct sFILE *stdin; // Standard Input
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31 struct sFILE *stdout; // Standard Output
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32 struct sFILE *stderr; // Standard Error
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33 ///\note Initialised in SoMain
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34 static const int STDIN_BUFSIZ = 512;
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35 static const int STDOUT_BUFSIZ = 512;
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38 void _stdio_init(void)
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40 // Init FileIO Pointers
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43 stdin->Flags = FILE_FLAG_ALLOC|FILE_FLAG_MODE_READ|FILE_FLAG_LINEBUFFERED|FILE_FLAG_OURBUFFER;
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44 stdin->Buffer = malloc(STDIN_BUFSIZ);
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45 stdin->BufferSpace = STDIN_BUFSIZ;
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49 stdout->Flags = FILE_FLAG_ALLOC|FILE_FLAG_MODE_WRITE|FILE_FLAG_LINEBUFFERED|FILE_FLAG_OURBUFFER;
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50 stdout->Buffer = malloc(STDOUT_BUFSIZ);
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51 stdout->BufferSpace = STDOUT_BUFSIZ;
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55 stderr->Flags = FILE_FLAG_ALLOC|FILE_FLAG_MODE_WRITE;
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58 void _stdio_cleanup(void)
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61 for( i = 0; i < STDIO_MAX_STREAMS; i ++ )
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67 int _fopen_modetoflags(const char *mode)
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74 case 'r': flags = FILE_FLAG_MODE_READ; break;
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75 case 'w': flags = FILE_FLAG_MODE_WRITE; break;
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76 case 'a': flags = FILE_FLAG_MODE_APPEND; break;
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77 case 'x': flags = FILE_FLAG_MODE_EXEC; break; // Acess addon
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84 for( ; *mode; mode ++ )
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88 case 'b': flags |= FILE_FLAG_M_BINARY; break;
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89 case '+': flags |= FILE_FLAG_M_EXT; break;
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99 * \fn FILE *freopen(char *file, char *mode, FILE *fp)
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101 EXPORT FILE *freopen(const char *file, const char *mode, FILE *fp)
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105 // Sanity Check Arguments
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106 if(!fp || !file || !mode) return NULL;
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108 if(fp->FD != FD_NOTOPEN) {
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113 fp->Flags = _fopen_modetoflags(mode);
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114 if(fp->Flags == -1)
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118 switch(fp->Flags & FILE_FLAG_MODE_MASK)
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121 case FILE_FLAG_MODE_READ:
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122 openFlags = OPENFLAG_READ;
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123 if(fp->Flags & FILE_FLAG_M_EXT)
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124 openFlags |= OPENFLAG_WRITE;
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127 case FILE_FLAG_MODE_WRITE:
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128 openFlags = OPENFLAG_WRITE;
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129 if(fp->Flags & FILE_FLAG_M_EXT)
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130 openFlags |= OPENFLAG_READ;
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133 case FILE_FLAG_MODE_APPEND:
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134 openFlags = OPENFLAG_APPEND;
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135 if(fp->Flags & FILE_FLAG_M_EXT)
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136 openFlags |= OPENFLAG_READ;
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139 case FILE_FLAG_MODE_EXEC:
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140 openFlags = OPENFLAG_EXEC;
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145 if(fp->FD != FD_NOTOPEN)
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146 fp->FD = _SysReopen(fp->FD, file, openFlags);
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148 fp->FD = _SysOpen(file, openFlags);
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154 // Default to buffered
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155 // - Disabled until fseek() is fixed
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159 fp->BufferSpace = BUFSIZ;
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160 fp->Buffer = malloc( fp->BufferSpace );
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161 fp->Flags |= FILE_FLAG_OURBUFFER;
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164 if( (fp->Flags & FILE_FLAG_MODE_MASK) == FILE_FLAG_MODE_APPEND ) {
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165 _SysSeek(fp->FD, 0, SEEK_END); //SEEK_END
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171 \fn FILE *fopen(const char *file, const char *mode)
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172 \brief Opens a file and returns the pointer
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173 \param file String - Filename to open
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174 \param mode Mode to open in
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176 EXPORT FILE *fopen(const char *file, const char *mode)
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180 // Sanity Check Arguments
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181 if(!file || !mode) return NULL;
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183 // Create Return Structure
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184 retFile = get_file_struct();
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186 return freopen(file, mode, retFile);
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189 EXPORT FILE *fmemopen(void *buffer, size_t length, const char *mode)
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193 if( !buffer || !mode ) return NULL;
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195 ret = get_file_struct();
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197 ret->FD = FD_MEMFILE;
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198 ret->Flags = _fopen_modetoflags(mode);
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199 if(ret->Flags == -1) {
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204 ret->Buffer = buffer;
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205 ret->BufferPos = 0;
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206 ret->BufferSpace = length;
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211 EXPORT FILE *open_memstream(char **bufferptr, size_t *lengthptr)
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213 FILE *ret = get_file_struct();
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214 ret->FD = FD_MEMSTREAM;
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215 ret->Flags = FILE_FLAG_MODE_WRITE;
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217 ret->Buffer = NULL;
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218 ret->BufferPos = 0;
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219 ret->BufferSpace = 0;
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220 ret->BufPtr = bufferptr;
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221 ret->LenPtr = lengthptr;
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226 EXPORT int fclose(FILE *fp)
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228 if( !(fp->Flags & FILE_FLAG_ALLOC) )
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231 if( fp->FD >= 0 ) {
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233 if( fp->Buffer && (fp->Flags & FILE_FLAG_OURBUFFER) ) {
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239 fp->FD = FD_NOTOPEN;
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243 EXPORT int setvbuf(FILE *fp, char *buffer, int mode, size_t size)
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250 // Check for memory files
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251 if( fp->FD == FD_MEMFILE || fp->FD == FD_MEMSTREAM ) {
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256 // Not strictly needed, as this should only be called before any IO
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259 // Eliminate any pre-existing buffer
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261 free( fp->Buffer );
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263 fp->BufferSpace = 0;
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267 if( mode == _IONBF ) {
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268 // Do nothing, buffering was disabled above
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272 // Sanity check buffering mode before allocating
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273 if( mode != _IOLBF && mode != _IOFBF ) {
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277 // Allocate a buffer if one was not provided
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279 fp->Flags |= FILE_FLAG_OURBUFFER;
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280 buffer = malloc(size);
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284 fp->Flags &= ~FILE_FLAG_OURBUFFER;
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287 // Set buffer pointer and size
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288 fp->Buffer = buffer;
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289 fp->BufferSpace = size;
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292 if( mode == _IOLBF )
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293 fp->Flags |= FILE_FLAG_LINEBUFFERED;
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295 fp->Flags &= ~FILE_FLAG_LINEBUFFERED;
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301 int _fflush_int(FILE *fp)
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306 // Check the buffer contains data
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307 if( fp->BufferPos == 0 )
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310 switch(fp->Flags & FILE_FLAG_MODE_MASK)
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312 // Read - Flush input buffer
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313 case FILE_FLAG_MODE_READ:
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317 // Append - Seek to end and write
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318 case FILE_FLAG_MODE_APPEND:
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319 _SysSeek(fp->FD, fp->BufferOfs, SEEK_SET);
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320 len = _SysWrite(fp->FD, fp->Buffer, fp->BufferPos);
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321 if( len != fp->BufferPos )
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323 if( len <= fp->BufferPos )
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325 fp->BufferPos -= len;
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327 fp->BufferOfs = _SysTell(fp->FD);
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330 // Write - Write buffer
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331 case FILE_FLAG_MODE_WRITE:
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332 //_SysDebug("Flushing to %i '%.*s'", fp->FD, fp->BufferPos, fp->Buffer);
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333 len = _SysWrite(fp->FD, fp->Buffer, fp->BufferPos);
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334 if( len != fp->BufferPos )
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336 if( len <= fp->BufferPos )
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338 fp->BufferPos -= len;
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341 // _SysDebug("Flush of %i failed, %s", fp->FD, strerror(errno));
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350 EXPORT void fflush(FILE *fp)
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352 if( !fp || fp->FD == FD_NOTOPEN )
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355 // Nothing to do for memory files
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356 if( fp->FD == FD_MEMFILE )
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358 // Memory streams, update pointers
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359 if( fp->FD == FD_MEMSTREAM ) {
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360 *fp->BufPtr = fp->Buffer;
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361 *fp->LenPtr = fp->BufferPos;
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368 EXPORT void clearerr(FILE *fp)
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370 if( !fp || fp->FD == FD_NOTOPEN )
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373 // TODO: Impliment clearerr()
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376 EXPORT int feof(FILE *fp)
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378 if( !fp || fp->FD == FD_NOTOPEN )
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380 return !!(fp->Flags & FILE_FLAG_EOF);
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383 EXPORT int ferror(FILE *fp)
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385 if( !fp || fp->FD == FD_NOTOPEN )
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389 EXPORT int fileno(FILE *stream)
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394 EXPORT off_t ftell(FILE *fp)
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396 if(!fp || fp->FD == FD_NOTOPEN) {
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401 if( fp->FD == FD_MEMFILE || fp->FD == FD_MEMSTREAM )
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404 return _SysTell(fp->FD);
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407 int _fseek_memfile(FILE *fp, long int amt, int whence)
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418 if( fp->BufferSpace < (size_t)amt )
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421 fp->Pos = fp->BufferSpace - amt;
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424 if(fp->Pos > (off_t)fp->BufferSpace) {
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425 fp->Pos = fp->BufferSpace;
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426 fp->Flags |= FILE_FLAG_EOF;
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431 int _fseek_memstream(FILE *fp, long int amt, int whence)
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442 if( fp->BufferSpace < (size_t)amt )
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445 fp->Pos = fp->BufferSpace - amt;
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448 if(fp->Pos > (off_t)fp->BufferSpace) {
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449 fp->Pos = fp->BufferSpace;
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450 fp->Flags |= FILE_FLAG_EOF;
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455 EXPORT int fseek(FILE *fp, long int amt, int whence)
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457 if(!fp || fp->FD == FD_NOTOPEN) {
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462 if( fp->FD == FD_MEMFILE ) {
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463 return _fseek_memfile(fp, amt, whence);
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465 else if( fp->FD == FD_MEMSTREAM ) {
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466 return _fseek_memstream(fp, amt, whence);
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470 _SysSeek(fp->FD, amt, whence);
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471 fp->Pos = _SysTell(fp->FD);
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476 size_t _fwrite_unbuffered(FILE *fp, size_t size, size_t num, const void *data)
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478 size_t ret = 0, bytes;
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481 bytes = _SysWrite(fp->FD, data, size);
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482 if( bytes == (size_t)-1 ) {
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484 // TODO: Set error flag
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487 if( bytes != size ) {
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488 _SysDebug("_fwrite_unbuffered: Oops, rollback %i/%i bytes!", bytes, size);
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489 _SysSeek(fp->FD, -bytes, SEEK_CUR);
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492 data = (char*)data + size;
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494 fp->Pos += ret * size;
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498 size_t _fwrite_memfile(const void *ptr, size_t size, size_t num, FILE *fp)
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500 size_t avail = (fp->BufferSpace - fp->Pos) / size;
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502 fp->Flags |= FILE_FLAG_EOF;
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505 size_t bytes = num * size;
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506 memcpy(fp->Buffer + fp->Pos, ptr, bytes);
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511 size_t _fwrite_memstream(const void *ptr, size_t size, size_t num, FILE *fp)
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513 size_t bytes = size*num;
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514 // #1. Check if we need to expand
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515 if( fp->Pos + bytes > fp->BufferSpace )
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517 void *newbuf = realloc(fp->Buffer, fp->BufferSpace + bytes);
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522 fp->Buffer = newbuf;
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523 fp->BufferSpace = fp->Pos + bytes;
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525 // #2. Write (use the memfile code for that)
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526 return _fwrite_memfile(ptr, size, num, fp);
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530 * \fn EXPORT size_t fwrite(void *ptr, size_t size, size_t num, FILE *fp)
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531 * \brief Write to a stream
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533 EXPORT size_t fwrite(const void *ptr, size_t size, size_t num, FILE *fp)
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537 if(!fp || fp->FD == -1)
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539 if( size == 0 || num == 0 )
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542 switch( _GetFileMode(fp) )
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544 case FILE_FLAG_MODE_READ:
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545 case FILE_FLAG_MODE_EXEC:
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548 case FILE_FLAG_MODE_APPEND:
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549 fseek(fp, 0, SEEK_END);
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550 case FILE_FLAG_MODE_WRITE:
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551 // Handle memory files first
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552 if( fp->FD == FD_MEMFILE ) {
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553 return _fwrite_memfile(ptr, size, num, fp);
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555 else if( fp->FD == FD_MEMSTREAM ) {
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556 return _fwrite_memstream(ptr, size, num, fp);
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558 else if( fp->BufferSpace )
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560 // Buffering enabled
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561 if( fp->BufferSpace - fp->BufferPos < size*num )
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563 // If there's not enough space, flush and write-through
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564 _fflush_int(fp); // TODO: check ret
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565 ret = _fwrite_unbuffered(fp, size, num, ptr);
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567 else if( (fp->Flags & FILE_FLAG_LINEBUFFERED) && memchr(ptr,'\n',size*num) )
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569 // Newline present? Flush though
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570 _fflush_int(fp); // TODO: check ret
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571 ret = _fwrite_unbuffered(fp, size, num, ptr);
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576 memcpy( fp->Buffer + fp->BufferPos, ptr, size*num );
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577 fp->BufferPos += size*num;
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583 // Bufering disabled, write-though
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584 ret = _fwrite_unbuffered(fp, size, num, ptr);
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586 // errno should be set earlier
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593 size_t _fread_memfile(void *ptr, size_t size, size_t num, FILE *fp)
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595 size_t avail = (fp->BufferSpace - fp->Pos) / size;
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597 fp->Flags |= FILE_FLAG_EOF;
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598 if( num > avail ) num = avail;
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599 size_t bytes = num * size;
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600 memcpy(ptr, fp->Buffer + fp->Pos, bytes);
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606 size_t _fread_memstream(void *ptr, size_t size, size_t num, FILE *fp)
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613 size_t _fread_buffered(void *ptr, size_t size, FILE *fp)
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615 _SysDebug("%p: %i-%i <= %i", fp,
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616 (int)fp->Pos, (int)fp->BufferOfs, (int)fp->BufferPos);
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617 if( fp->BufferPos > 0 ) {
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618 assert( fp->Pos - fp->BufferOfs <= fp->BufferPos );
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620 if( fp->BufferPos == 0 || fp->Pos - fp->BufferOfs == fp->BufferPos )
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622 int rv = _SysRead(fp->FD, fp->Buffer, fp->BufferSpace);
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624 fp->Flags |= FILE_FLAG_EOF;
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628 fp->BufferPos = rv;
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629 fp->BufferOfs = fp->Pos;
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630 _SysDebug("%p: Buffered %i at %i", fp, rv, fp->Pos);
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633 size_t inner_ofs = fp->Pos - fp->BufferOfs;
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634 if(size > fp->BufferPos - inner_ofs)
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635 size = fp->BufferPos - inner_ofs;
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637 _SysDebug("%p: Read %i from %i+%i", fp, size,
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638 (int)fp->BufferOfs, inner_ofs);
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639 memcpy(ptr, fp->Buffer + inner_ofs, size);
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645 * \fn EXPORT size_t fread(void *ptr, size_t size, size_t num, FILE *fp)
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646 * \brief Read from a stream
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648 EXPORT size_t fread(void *ptr, size_t size, size_t num, FILE *fp)
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652 if(!fp || fp->FD == -1)
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654 if( size == 0 || num == 0 )
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657 if( _GetFileMode(fp) != FILE_FLAG_MODE_READ ) {
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662 // Don't read if EOF is set
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663 if( fp->Flags & FILE_FLAG_EOF )
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667 if( fp->FD == FD_MEMFILE ) {
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668 return _fread_memfile(ptr, size, num, fp);
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670 else if( fp->FD == FD_MEMSTREAM ) {
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671 //return _fread_memstream(ptr, size, num, fp);
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677 const size_t bytes = size*num;
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679 // TODO: Buffered reads
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680 if( fp->BufferSpace )
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684 // While not done, and buffered read succeeds
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685 while( ofs < bytes && (rv = _fread_buffered((char*)ptr + ofs, bytes - ofs, fp)) != 0 )
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694 ret = _SysRead(fp->FD, ptr, bytes);
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695 if( ret == (size_t)-1)
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697 if( ret == 0 && bytes > 0 ) {
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698 fp->Flags |= FILE_FLAG_EOF;
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703 // if read was cut short
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706 size_t extra = ret - (ret / size) * size;
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707 // And it didn't fall short on a member boundary
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710 // Need to roll back the file pointer to the end of the last member
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711 _SysDebug("fread: TODO Roll back %zi bytes due to incomplete object (sz=%zi,n=%zi)",
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721 * \brief Write a string to a stream (without trailing \n)
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723 EXPORT int fputs(const char *s, FILE *fp)
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725 int len = strlen(s);
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726 return fwrite(s, 1, len, fp);
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730 * \brief Read a line (and possible trailing \n into a buffer)
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732 EXPORT char *fgets(char *s, int size, FILE *fp)
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736 while( ofs < size && ch != '\n' )
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738 if( fread(&ch, 1, 1, fp) != 1 )
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748 * \fn EXPORT int fputc(int c, FILE *fp)
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749 * \brief Write a single character to the stream
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751 EXPORT int fputc(int c, FILE *fp)
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754 return fwrite(&ch, 1, 1, fp);
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757 EXPORT int putchar(int c)
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760 return fputc(c, stdout);
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764 * \fn EXPORT int fgetc(FILE *fp)
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765 * \brief Read a character from the stream
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767 EXPORT int fgetc(FILE *fp)
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770 if( fread(&ret, 1, 1, fp) != 1 )
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775 EXPORT int getchar(void)
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777 return fgetc(stdin);
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780 EXPORT int puts(const char *str)
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784 int len = strlen(str);
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786 fwrite(str, 1, len, stdout);
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787 fwrite("\n", 1, 1, stdout);
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791 // --- INTERNAL ---
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793 * \fn FILE *get_file_struct()
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794 * \brief Returns a file descriptor structure
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796 FILE *get_file_struct()
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798 for(int i=0;i<STDIO_MAX_STREAMS;i++)
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800 if(_iob[i].Flags & FILE_FLAG_ALLOC)
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802 _iob[i].Flags |= FILE_FLAG_ALLOC;
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