int
get_next_index( simple_reader * sri, const int last_index )
{
int index, check;
char *iline = NULL;
while( sr_readline( sri ) ) {
iline = sr_line( sri );
if( sr_line_isempty( sri ) )
continue;
if( '#' == iline[0] )
continue;
break;
}
if( sr_eof( sri ) || NULL == iline )
return -1;
check = sscanf( iline, "%d", &index );
if( check != 1 ) {
fprintf( stderr, "ERROR: could not read index on line %d of %s\n",
sr_linenum( sri ), sr_filename( sri ) );
exit( EXIT_FAILURE );
}
if( index <= 0 || index <= last_index ) {
fprintf( stderr, "ERROR: bad index on line %d of %s\n",
sr_linenum( sri ), sr_filename( sri ) );
fprintf( stderr, " -> INDEX must be positive non-zero and monotonically increasing\n" );
exit( EXIT_FAILURE );
}
return index;
}
int
sr_termio (char *outstrP, char *inbufP, int inbuflen)
{
int len;
sr_termout(outstrP);
len = sr_readline(inbufP, inbuflen);
return len;
}
int
main( int argc, char **argv )
{
/* these could also be declared as "void *" */
simple_reader *srd, *sri;
int index = -1;
int nindex = 0, nindex_used = 0;
int ndata = 0, nkeep = 0;
if( argc < 3 ) {
fprintf( stderr, "Usage: %s FILE INDEX > TRIMMED_FILE\n", argv[0] );
fprintf( stderr, " **NOTE: assumes sorted INDEX (monotonically increasing)\n" );
return EXIT_FAILURE;
}
srd = sr_init( argv[1] ); /* input DATA file */
sri = sr_init( argv[2] ); /* input INDEX file */
fprintf( stderr, "TRIMMING: %s\n", sr_filename( srd ) );
fprintf( stderr, "FROM INDEX: %s\n", sr_filename( sri ) );
/* loop over input data file */
while( sr_readline( srd ) ) {
char *line;
line = sr_line( srd );
if( sr_line_isempty( srd ) )
continue;
if( '#' == line[0] )
continue;
ndata += 1;
/* ndata is the appropriate 1-based input index, comments and blank lines skipped */
while( index < ndata ) {
index = get_next_index( sri, index );
if( index < 1 )
break;
nindex += 1;
}
if( ndata == index ) {
nkeep += 1;
fprintf( stdout, "%s\n", line );
}
if( sr_eof( sri ) )
break;
}
nindex_used = nindex;
/* check to see how much longer index is */
while( !sr_eof( sri ) ) {
index = get_next_index( sri, index );
if( index < 1 )
break;
nindex += 1;
}
fprintf( stderr, "INDEX: used %d of %d entries\n", nindex_used, nindex );
srd = sr_kill( srd );
sri = sr_kill( sri );
fprintf( stderr, "INPUT: kept %d of %d read (could be truncated due to short INDEX)\n",
nkeep, ndata );
return EXIT_SUCCESS;
}
