diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp new file mode 100644 index 00000000..738d47cc --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp @@ -0,0 +1,100 @@ +// FILE: BufFileInput.cpp +// AUTHOR: Alexey Demakov (AVD) demakov@kazbek.ispras.ru +// CREATION: 26-JAN-1998 +// DESCRIPTION: File Input Stream with lookahead for Scanner. +// See file BufFileInput.h for details + +// Change History: +// +// 22-Jun-1998 assert.h -> PCCTS_ASSERT_H +// string.h -> PCCTS_STRING_H +// +// 28-May-1998 Add virtual destructor to release buffer. +// +// Add dummy definition for ANTLRTokenType +// to allow compilation without knowing +// token type codes. +// +// Manfred Kogler (km@cast.uni-linz.ac.at) +// (1.33MR14) +// +// 20-Jul-1998 MR14a - Reorder initialization list for ctor. +// + +enum ANTLRTokenType {TER_HATES_CPP=0, SO_DO_OTHERS=9999 }; + +#include "pcctscfg.h" +#include "pccts_assert.h" +#include "pccts_string.h" + +PCCTS_NAMESPACE_STD + +#include "BufFileInput.h" + +BufFileInput::BufFileInput( FILE *f, int buf_size ) +: input( f ), + buf( new int[buf_size] ), + size( buf_size ), + start( 0 ), + len( 0 ) +{ +} + +BufFileInput::~BufFileInput() +{ + delete [] buf; +} + +int BufFileInput::nextChar( void ) +{ + if( len > 0 ) + { + // get char from buffer + int c = buf[start]; + + if( c != EOF ) + { + start++; start %= size; + len--; + } + return c; + } else { + // get char from file + int c = getc( input ); + + if( c == EOF ) + { + // if EOF - put it in the buffer as indicator + buf[start] = EOF; + len++; + } + return c; + } +} + +int BufFileInput::lookahead( char* s ) +{ + int l = strlen( s ); + + assert( 0 < l && l <= size ); + + while( len < l ) + { + int c = getc( input ); + + buf[ (start+len) % size ] = c; + + len++; + + if( c == EOF ) return 0; + } + + for( int i = 0; i < l; i++ ) + { + if( s[i] != buf[ (start+i) % size ] ) return 0; + } + return 1; +} + +// End of file BufFileInput.cpp + |