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;
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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;
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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 if( (fp->Flags & FILE_FLAG_MODE_MASK) == FILE_FLAG_MODE_APPEND ) {
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155 _SysSeek(fp->FD, 0, SEEK_END); //SEEK_END
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161 \fn FILE *fopen(const char *file, const char *mode)
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162 \brief Opens a file and returns the pointer
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163 \param file String - Filename to open
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164 \param mode Mode to open in
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166 EXPORT FILE *fopen(const char *file, const char *mode)
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170 // Sanity Check Arguments
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171 if(!file || !mode) return NULL;
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173 // Create Return Structure
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174 retFile = get_file_struct();
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176 return freopen(file, mode, retFile);
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179 EXPORT FILE *fmemopen(void *buffer, size_t length, const char *mode)
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183 if( !buffer || !mode ) return NULL;
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185 ret = get_file_struct();
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187 ret->FD = FD_MEMFILE;
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188 ret->Flags = _fopen_modetoflags(mode);
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189 if(ret->Flags == -1) {
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194 ret->Buffer = buffer;
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195 ret->BufferPos = 0;
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196 ret->BufferSpace = length;
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201 EXPORT FILE *open_memstream(char **bufferptr, size_t *lengthptr)
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203 FILE *ret = get_file_struct();
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204 ret->FD = FD_MEMSTREAM;
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205 ret->Flags = FILE_FLAG_MODE_WRITE;
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207 ret->Buffer = NULL;
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208 ret->BufferPos = 0;
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209 ret->BufferSpace = 0;
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210 ret->BufPtr = bufferptr;
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211 ret->LenPtr = lengthptr;
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216 EXPORT int fclose(FILE *fp)
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218 if( !(fp->Flags & FILE_FLAG_ALLOC) )
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221 if( fp->FD >= 0 ) {
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225 fp->FD = FD_NOTOPEN;
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229 EXPORT int setvbuf(FILE *fp, char *buffer, int mode, size_t size)
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236 // Check for memory files
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237 if( fp->FD == FD_MEMFILE || fp->FD == FD_MEMSTREAM ) {
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242 // Not strictly needed, as this should only be called before any IO
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245 // Eliminate any pre-existing buffer
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247 free( fp->Buffer );
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249 fp->BufferSpace = 0;
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253 if( mode == _IONBF ) {
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254 // Do nothing, buffering was disabled above
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258 // Sanity check buffering mode before allocating
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259 if( mode != _IOLBF && mode != _IOFBF ) {
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263 // Allocate a buffer if one was not provided
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265 buffer = malloc(size);
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269 // Set buffer pointer and size
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270 fp->Buffer = buffer;
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271 fp->BufferSpace = size;
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274 if( mode == _IOLBF )
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275 fp->Flags |= FILE_FLAG_LINEBUFFERED;
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277 fp->Flags &= ~FILE_FLAG_LINEBUFFERED;
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283 int _fflush_int(FILE *fp)
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288 // Check the buffer contains data
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289 if( fp->BufferPos == 0 )
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292 switch(fp->Flags & FILE_FLAG_MODE_MASK)
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294 // Read - Flush input buffer
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295 case FILE_FLAG_MODE_READ:
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299 // Append - Seek to end and write
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300 case FILE_FLAG_MODE_APPEND:
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301 _SysSeek(fp->FD, fp->BufferOfs, SEEK_SET);
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302 len = _SysWrite(fp->FD, fp->Buffer, fp->BufferPos);
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303 if( len != fp->BufferPos )
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305 if( len <= fp->BufferPos )
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307 fp->BufferPos -= len;
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309 fp->BufferOfs = _SysTell(fp->FD);
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312 // Write - Write buffer
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313 case FILE_FLAG_MODE_WRITE:
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314 //_SysDebug("Flushing to %i '%.*s'", fp->FD, fp->BufferPos, fp->Buffer);
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315 len = _SysWrite(fp->FD, fp->Buffer, fp->BufferPos);
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316 if( len != fp->BufferPos )
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318 if( len <= fp->BufferPos )
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320 fp->BufferPos -= len;
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323 // _SysDebug("Flush of %i failed, %s", fp->FD, strerror(errno));
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332 EXPORT void fflush(FILE *fp)
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334 if( !fp || fp->FD == FD_NOTOPEN )
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337 // Nothing to do for memory files
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338 if( fp->FD == FD_MEMFILE )
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340 // Memory streams, update pointers
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341 if( fp->FD == FD_MEMSTREAM ) {
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342 *fp->BufPtr = fp->Buffer;
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343 *fp->LenPtr = fp->BufferPos;
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350 EXPORT void clearerr(FILE *fp)
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352 if( !fp || fp->FD == FD_NOTOPEN )
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355 // TODO: Impliment clearerr()
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358 EXPORT int feof(FILE *fp)
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360 if( !fp || fp->FD == FD_NOTOPEN )
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362 return !!(fp->Flags & FILE_FLAG_EOF);
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365 EXPORT int ferror(FILE *fp)
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367 if( !fp || fp->FD == FD_NOTOPEN )
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371 EXPORT int fileno(FILE *stream)
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376 EXPORT off_t ftell(FILE *fp)
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378 if(!fp || fp->FD == FD_NOTOPEN) {
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383 if( fp->FD == FD_MEMFILE || fp->FD == FD_MEMSTREAM )
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386 return _SysTell(fp->FD);
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389 int _fseek_memfile(FILE *fp, long int amt, int whence)
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400 if( fp->BufferSpace < (size_t)amt )
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403 fp->Pos = fp->BufferSpace - amt;
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406 if(fp->Pos > (off_t)fp->BufferSpace) {
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407 fp->Pos = fp->BufferSpace;
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408 fp->Flags |= FILE_FLAG_EOF;
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413 int _fseek_memstream(FILE *fp, long int amt, int whence)
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424 if( fp->BufferSpace < (size_t)amt )
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427 fp->Pos = fp->BufferSpace - amt;
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430 if(fp->Pos > (off_t)fp->BufferSpace) {
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431 fp->Pos = fp->BufferSpace;
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432 fp->Flags |= FILE_FLAG_EOF;
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437 EXPORT int fseek(FILE *fp, long int amt, int whence)
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439 if(!fp || fp->FD == FD_NOTOPEN) {
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444 if( fp->FD == FD_MEMFILE ) {
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445 return _fseek_memfile(fp, amt, whence);
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447 else if( fp->FD == FD_MEMSTREAM ) {
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448 return _fseek_memstream(fp, amt, whence);
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452 _SysSeek(fp->FD, amt, whence);
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453 fp->Pos = _SysTell(fp->FD);
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458 size_t _fwrite_unbuffered(FILE *fp, size_t size, size_t num, const void *data)
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460 size_t ret = 0, bytes;
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463 bytes = _SysWrite(fp->FD, data, size);
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464 if( bytes == (size_t)-1 ) {
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466 // TODO: Set error flag
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469 if( bytes != size ) {
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470 _SysDebug("_fwrite_unbuffered: Oops, rollback %i/%i bytes!", bytes, size);
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471 _SysSeek(fp->FD, -bytes, SEEK_CUR);
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474 data = (char*)data + size;
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476 fp->Pos += ret * size;
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480 size_t _fwrite_memfile(const void *ptr, size_t size, size_t num, FILE *fp)
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482 size_t avail = (fp->BufferSpace - fp->Pos) / size;
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484 fp->Flags |= FILE_FLAG_EOF;
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487 size_t bytes = num * size;
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488 memcpy(fp->Buffer + fp->Pos, ptr, bytes);
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493 size_t _fwrite_memstream(const void *ptr, size_t size, size_t num, FILE *fp)
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495 size_t bytes = size*num;
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496 // #1. Check if we need to expand
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497 if( fp->Pos + bytes > fp->BufferSpace )
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499 void *newbuf = realloc(fp->Buffer, fp->BufferSpace + bytes);
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504 fp->Buffer = newbuf;
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505 fp->BufferSpace = fp->Pos + bytes;
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507 // #2. Write (use the memfile code for that)
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508 return _fwrite_memfile(ptr, size, num, fp);
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512 * \fn EXPORT size_t fwrite(void *ptr, size_t size, size_t num, FILE *fp)
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513 * \brief Write to a stream
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515 EXPORT size_t fwrite(const void *ptr, size_t size, size_t num, FILE *fp)
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519 if(!fp || fp->FD == -1)
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521 if( size == 0 || num == 0 )
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524 switch( _GetFileMode(fp) )
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526 case FILE_FLAG_MODE_READ:
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527 case FILE_FLAG_MODE_EXEC:
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530 case FILE_FLAG_MODE_APPEND:
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531 fseek(fp, 0, SEEK_END);
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532 case FILE_FLAG_MODE_WRITE:
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533 // Handle memory files first
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534 if( fp->FD == FD_MEMFILE ) {
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535 return _fwrite_memfile(ptr, size, num, fp);
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537 else if( fp->FD == FD_MEMSTREAM ) {
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538 return _fwrite_memstream(ptr, size, num, fp);
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540 else if( fp->BufferSpace )
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542 // Buffering enabled
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543 if( fp->BufferSpace - fp->BufferPos < size*num )
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545 // If there's not enough space, flush and write-through
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546 _fflush_int(fp); // TODO: check ret
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547 ret = _fwrite_unbuffered(fp, size, num, ptr);
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549 else if( (fp->Flags & FILE_FLAG_LINEBUFFERED) && memchr(ptr,'\n',size*num) )
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551 // Newline present? Flush though
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552 _fflush_int(fp); // TODO: check ret
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553 ret = _fwrite_unbuffered(fp, size, num, ptr);
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558 memcpy( fp->Buffer + fp->BufferPos, ptr, size*num );
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559 fp->BufferPos += size*num;
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565 // Bufering disabled, write-though
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566 ret = _fwrite_unbuffered(fp, size, num, ptr);
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568 // errno should be set earlier
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575 size_t _fread_memfile(void *ptr, size_t size, size_t num, FILE *fp)
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577 size_t avail = (fp->BufferSpace - fp->Pos) / size;
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579 fp->Flags |= FILE_FLAG_EOF;
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580 if( num > avail ) num = avail;
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581 size_t bytes = num * size;
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582 memcpy(ptr, fp->Buffer + fp->Pos, bytes);
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588 size_t _fread_memstream(void *ptr, size_t size, size_t num, FILE *fp)
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596 * \fn EXPORT size_t fread(void *ptr, size_t size, size_t num, FILE *fp)
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597 * \brief Read from a stream
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599 EXPORT size_t fread(void *ptr, size_t size, size_t num, FILE *fp)
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603 if(!fp || fp->FD == -1)
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605 if( size == 0 || num == 0 )
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608 if( _GetFileMode(fp) != FILE_FLAG_MODE_READ ) {
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613 if( fp->FD == FD_MEMFILE ) {
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614 return _fread_memfile(ptr, size, num, fp);
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616 else if( fp->FD == FD_MEMSTREAM ) {
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617 //return _fread_memstream(ptr, size, num, fp);
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623 ret = _SysRead(fp->FD, ptr, size*num);
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624 if( ret == (size_t)-1)
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626 if( ret == 0 && size*num > 0 ) {
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627 fp->Flags |= FILE_FLAG_EOF;
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636 * \brief Write a string to a stream (without trailing \n)
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638 EXPORT int fputs(const char *s, FILE *fp)
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640 int len = strlen(s);
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641 return fwrite(s, 1, len, fp);
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645 * \brief Read a line (and possible trailing \n into a buffer)
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647 EXPORT char *fgets(char *s, int size, FILE *fp)
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651 while( ofs < size && ch != '\n' )
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653 if( fread(&ch, 1, 1, fp) != 1 )
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663 * \fn EXPORT int fputc(int c, FILE *fp)
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664 * \brief Write a single character to the stream
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666 EXPORT int fputc(int c, FILE *fp)
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668 return fwrite(&c, 1, 1, fp);
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671 EXPORT int putchar(int c)
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674 return _SysWrite(_stdout, &c, 1);
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678 * \fn EXPORT int fgetc(FILE *fp)
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679 * \brief Read a character from the stream
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681 EXPORT int fgetc(FILE *fp)
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684 if( fread(&ret, 1, 1, fp) != 1 )
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689 EXPORT int getchar(void)
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692 if(_SysRead(_stdin, &ret, 1) != 1) return -1;
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696 EXPORT int puts(const char *str)
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703 len = _SysWrite(_stdout, str, len);
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704 _SysWrite(_stdout, "\n", 1);
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708 // --- INTERNAL ---
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710 * \fn FILE *get_file_struct()
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711 * \brief Returns a file descriptor structure
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713 FILE *get_file_struct()
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716 for(i=0;i<STDIO_MAX_STREAMS;i++)
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718 if(_iob[i].Flags & FILE_FLAG_ALLOC)
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720 _iob[i].Flags |= FILE_FLAG_ALLOC;
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