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abc/src/base/ver/verStream.c

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/**CFile****************************************************************
FileName [verStream.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Verilog parser.]
Synopsis [Input file stream, which knows nothing about Verilog.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - August 19, 2006.]
Revision [$Id: verStream.c,v 1.00 2006/08/19 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ver.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
#define VER_BUFFER_SIZE 1048576 // 1M - size of the data chunk stored in memory
#define VER_OFFSET_SIZE 65536 // 64K - load new data when less than this is left
#define VER_WORD_SIZE 65536 // 64K - the largest token that can be returned
#define VER_MINIMUM(a,b) (((a) < (b))? (a) : (b))
struct Ver_Stream_t_
{
// the input file
char * pFileName; // the input file name
FILE * pFile; // the input file pointer
int nFileSize; // the total number of bytes in the file
int nFileRead; // the number of bytes currently read from file
int nLineCounter; // the counter of lines processed
// temporary storage for data
char * pBuffer; // the buffer
int nBufferSize; // the size of the buffer
char * pBufferCur; // the current reading position
char * pBufferEnd; // the first position not used by currently loaded data
char * pBufferStop; // the position where loading new data will be done
// tokens given to the user
char pChars[VER_WORD_SIZE+5]; // temporary storage for a word (plus end-of-string and two parantheses)
int nChars; // the total number of characters in the word
// status of the parser
int fStop; // this flag goes high when the end of file is reached
};
static void Ver_StreamReload( Ver_Stream_t * p );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the file reader for the given file.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ver_Stream_t * Ver_StreamAlloc( char * pFileName )
{
Ver_Stream_t * p;
FILE * pFile;
int nCharsToRead;
// check if the file can be opened
pFile = fopen( pFileName, "rb" );
if ( pFile == NULL )
{
printf( "Ver_StreamAlloc(): Cannot open input file \"%s\".\n", pFileName );
return NULL;
}
// start the file reader
p = ABC_ALLOC( Ver_Stream_t, 1 );
memset( p, 0, sizeof(Ver_Stream_t) );
p->pFileName = pFileName;
p->pFile = pFile;
// get the file size, in bytes
fseek( pFile, 0, SEEK_END );
p->nFileSize = ftell( pFile );
rewind( pFile );
// allocate the buffer
p->pBuffer = ABC_ALLOC( char, VER_BUFFER_SIZE+1 );
p->nBufferSize = VER_BUFFER_SIZE;
p->pBufferCur = p->pBuffer;
// determine how many chars to read
nCharsToRead = VER_MINIMUM(p->nFileSize, VER_BUFFER_SIZE);
// load the first part into the buffer
fread( p->pBuffer, nCharsToRead, 1, p->pFile );
p->nFileRead = nCharsToRead;
// set the ponters to the end and the stopping point
p->pBufferEnd = p->pBuffer + nCharsToRead;
p->pBufferStop = (p->nFileRead == p->nFileSize)? p->pBufferEnd : p->pBuffer + VER_BUFFER_SIZE - VER_OFFSET_SIZE;
// start the arrays
p->nLineCounter = 1; // 1-based line counting
return p;
}
/**Function*************************************************************
Synopsis [Loads new data into the file reader.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ver_StreamReload( Ver_Stream_t * p )
{
int nCharsUsed, nCharsToRead;
assert( !p->fStop );
assert( p->pBufferCur > p->pBufferStop );
assert( p->pBufferCur < p->pBufferEnd );
// figure out how many chars are still not processed
nCharsUsed = p->pBufferEnd - p->pBufferCur;
// move the remaining data to the beginning of the buffer
memmove( p->pBuffer, p->pBufferCur, nCharsUsed );
p->pBufferCur = p->pBuffer;
// determine how many chars we will read
nCharsToRead = VER_MINIMUM( p->nBufferSize - nCharsUsed, p->nFileSize - p->nFileRead );
// read the chars
fread( p->pBuffer + nCharsUsed, nCharsToRead, 1, p->pFile );
p->nFileRead += nCharsToRead;
// set the ponters to the end and the stopping point
p->pBufferEnd = p->pBuffer + nCharsUsed + nCharsToRead;
p->pBufferStop = (p->nFileRead == p->nFileSize)? p->pBufferEnd : p->pBuffer + VER_BUFFER_SIZE - VER_OFFSET_SIZE;
}
/**Function*************************************************************
Synopsis [Stops the file reader.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ver_StreamFree( Ver_Stream_t * p )
{
if ( p->pFile )
fclose( p->pFile );
ABC_FREE( p->pBuffer );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis [Returns the file size.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
char * Ver_StreamGetFileName( Ver_Stream_t * p )
{
return p->pFileName;
}
/**Function*************************************************************
Synopsis [Returns the file size.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ver_StreamGetFileSize( Ver_Stream_t * p )
{
return p->nFileSize;
}
/**Function*************************************************************
Synopsis [Returns the current reading position.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ver_StreamGetCurPosition( Ver_Stream_t * p )
{
return p->nFileRead - (p->pBufferEnd - p->pBufferCur);
}
/**Function*************************************************************
Synopsis [Returns the line number for the given token.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ver_StreamGetLineNumber( Ver_Stream_t * p )
{
return p->nLineCounter;
}
/**Function*************************************************************
Synopsis [Returns current symbol.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ver_StreamIsOkey( Ver_Stream_t * p )
{
return !p->fStop;
}
/**Function*************************************************************
Synopsis [Returns current symbol.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
char Ver_StreamScanChar( Ver_Stream_t * p )
{
assert( !p->fStop );
return *p->pBufferCur;
}
/**Function*************************************************************
Synopsis [Returns current symbol and moves to the next.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
char Ver_StreamPopChar( Ver_Stream_t * p )
{
assert( !p->fStop );
// check if the new data should to be loaded
if ( p->pBufferCur > p->pBufferStop )
Ver_StreamReload( p );
// check if there are symbols left
if ( p->pBufferCur == p->pBufferEnd ) // end of file
{
p->fStop = 1;
return -1;
}
// count the lines
if ( *p->pBufferCur == '\n' )
p->nLineCounter++;
return *p->pBufferCur++;
}
/**Function*************************************************************
Synopsis [Skips the current symbol and all symbols from the list.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ver_StreamSkipChars( Ver_Stream_t * p, char * pCharsToSkip )
{
char * pChar, * pTemp;
assert( !p->fStop );
assert( pCharsToSkip != NULL );
// check if the new data should to be loaded
if ( p->pBufferCur > p->pBufferStop )
Ver_StreamReload( p );
// skip the symbols
for ( pChar = p->pBufferCur; pChar < p->pBufferEnd; pChar++ )
{
// skip symbols as long as they are in the list
for ( pTemp = pCharsToSkip; *pTemp; pTemp++ )
if ( *pChar == *pTemp )
break;
if ( *pTemp == 0 ) // pChar is not found in the list
{
p->pBufferCur = pChar;
return;
}
// count the lines
if ( *pChar == '\n' )
p->nLineCounter++;
}
// the file is finished or the last part continued
// through VER_OFFSET_SIZE chars till the end of the buffer
if ( p->pBufferStop == p->pBufferEnd ) // end of file
{
p->fStop = 1;
return;
}
printf( "Ver_StreamSkipSymbol() failed to parse the file \"%s\".\n", p->pFileName );
}
/**Function*************************************************************
Synopsis [Skips all symbols until encountering one from the list.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ver_StreamSkipToChars( Ver_Stream_t * p, char * pCharsToStop )
{
char * pChar, * pTemp;
assert( !p->fStop );
assert( pCharsToStop != NULL );
// check if the new data should to be loaded
if ( p->pBufferCur > p->pBufferStop )
Ver_StreamReload( p );
// skip the symbols
for ( pChar = p->pBufferCur; pChar < p->pBufferEnd; pChar++ )
{
// skip symbols as long as they are NOT in the list
for ( pTemp = pCharsToStop; *pTemp; pTemp++ )
if ( *pChar == *pTemp )
break;
if ( *pTemp == 0 ) // pChar is not found in the list
{
// count the lines
if ( *pChar == '\n' )
p->nLineCounter++;
continue;
}
// the symbol is found - move position and return
p->pBufferCur = pChar;
return;
}
// the file is finished or the last part continued
// through VER_OFFSET_SIZE chars till the end of the buffer
if ( p->pBufferStop == p->pBufferEnd ) // end of file
{
p->fStop = 1;
return;
}
printf( "Ver_StreamSkipToSymbol() failed to parse the file \"%s\".\n", p->pFileName );
}
/**Function*************************************************************
Synopsis [Returns current word delimited by the set of symbols.]
Description [Modifies the stream by inserting 0 at the first encounter
of one of the symbols in the list.]
SideEffects []
SeeAlso []
***********************************************************************/
char * Ver_StreamGetWord( Ver_Stream_t * p, char * pCharsToStop )
{
char * pChar, * pTemp;
if ( p->fStop )
return NULL;
assert( pCharsToStop != NULL );
// check if the new data should to be loaded
if ( p->pBufferCur > p->pBufferStop )
Ver_StreamReload( p );
// skip the symbols
p->nChars = 0;
for ( pChar = p->pBufferCur; pChar < p->pBufferEnd; pChar++ )
{
// skip symbols as long as they are NOT in the list
for ( pTemp = pCharsToStop; *pTemp; pTemp++ )
if ( *pChar == *pTemp )
break;
if ( *pTemp == 0 ) // pChar is not found in the list
{
p->pChars[p->nChars++] = *pChar;
if ( p->nChars == VER_WORD_SIZE )
{
printf( "Ver_StreamGetWord(): The buffer size is exceeded.\n" );
return NULL;
}
// count the lines
if ( *pChar == '\n' )
p->nLineCounter++;
continue;
}
// the symbol is found - move the position, set the word end, return the word
p->pBufferCur = pChar;
p->pChars[p->nChars] = 0;
return p->pChars;
}
// the file is finished or the last part continued
// through VER_OFFSET_SIZE chars till the end of the buffer
if ( p->pBufferStop == p->pBufferEnd ) // end of file
{
p->fStop = 1;
p->pChars[p->nChars] = 0;
return p->pChars;
}
printf( "Ver_StreamGetWord() failed to parse the file \"%s\".\n", p->pFileName );
return NULL;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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