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Power-Programmierung CD 2 (Tewi)(1994).iso
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f_trail.c
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1992-07-02
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/*
* Usage - f_trail [/4] < ASCII text > revised
*
* F_TRAIL Remove trailing blanks from lines of ASCII text. The /4
* option is for backward compatability only; it leaves a
* blank in the fourth column where a line consists of a
* three digit field number only.
*
* input: Any printable ASCII file.
*
* output: The same file with trailing blanks removed from each line.
*
* writeup: MIR TUTORIAL ONE, topic 9
*
* Written: Douglas Lowry May 08 92
* Copyright (C) 1992 Marpex Inc.
*
* The MIR (Mass Indexing and Retrieval) Tutorials explain detailed
* usage and co-ordination of the MIR family of programs to analyze,
* prepare and index databases (small through gigabyte size), and
* how to build integrated retrieval software around the MIR search
* engine. The fifth of the five MIR tutorial series explains how
* to extend indexing capability into leading edge search-related
* technologies. For more information, GO IBMPRO on CompuServe;
* MIR files are in the DBMS library. The same files are on the
* Canada Remote Systems BBS. A diskette copy of the Introduction
* is available by mail ($10 US... check, Visa or Mastercard);
* diskettes with Introduction, Tutorial ONE software and the
* shareware Tutorial ONE text cost $29. Shareware registration
* for a tutorial is also $29.
*
* E-mail...
* Compuserve 71431,1337
* Internet doug.lowry%canrem.com
* UUCP canrem!doug.lowry
* Others: doug.lowry@canrem.uucp
*
* FAX... 416 963-5677
*
* "Snail mail"... Douglas Lowry, Ph.D.
* Marpex Inc.
* 5334 Yonge Street, #1102
* North York, Ontario
* Canada M2N 6M2
*
* Related database consultation and preparation services are
* available through:
* Innotech Inc., 2001 Sheppard Avenue E., Suite #118,
* North York, Ontario Canada M2J 4Z7
* Tel. 416 492-3838 FAX 416 492-3843
*
* This program is free software; you may redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* (file 05LICENS) along with this program; if not, write to the
* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
* USA.
*/
#include <stdio.h>
#include <stdlib.h>
#define MAX_BYTES 4096
#define repeat for(;;)
/*
* declarations
*/
typedef enum _bool
{ FALSE = 0, TRUE = 1 } Bool;
void Usage_(), process();
char *Cmdname_() { return( "f_trail" ); }
/*
* MAIN
*/
main( argc, argv )
int argc;
char **argv;
{
Bool four ; /* Leave blank after field number */
char c10 ;
if( argc > 2 )
Usage_() ;
four = FALSE ;
if( argc == 2 )
{
c10 = argv[1][0] ;
if(( c10 == '-' || c10 == '/' ) && argv[1][1] == '4' )
four = TRUE ;
else
Usage_() ;
}
process( four ) ;
exit( 0 );
}
/*
* Usage
*/
void
Usage_()
{
fprintf( stderr,
"\nUsage: %s [/4] < ASCII text > revised\n\n\
Remove trailing blanks from lines of ASCII text. The /4\n\
option is for backward compatability only; it leaves a\n\
blank in the fourth column where a line consists of a\n\
three digit field number only.\n\n", Cmdname_() ) ;
fprintf( stderr,
"input: Any printable ASCII file.\n\n\
output: The same file with trailing blanks removed from each line.\n\n\
writeup: MIR TUTORIAL ONE, topic 9\n\n" ) ;
exit( 1 ) ;
}
/*
* PROCESS
*/
void
process( four )
Bool four ; /* Leave blank after field number */
{
char line_in[ MAX_BYTES ];
int len ;
while( fgets( line_in, MAX_BYTES, stdin ) != NULL )
{
len = strlen( line_in ) - 1 ;
if( len > MAX_BYTES - 4 )
{
fprintf( stderr, "FATAL... line length exceeds %d bytes.\n",
MAX_BYTES ) ;
exit( 1 ) ;
}
while( line_in[ len - 1 ] == ' ' )
len-- ;
if( four && len == 3 )
{
line_in[3] = ' ' ;
len = 4 ;
}
line_in[ len ] = '\0' ;
if( puts( line_in ))
{
fprintf( stderr, "FATAL... unable to write.\n" );
exit( 1 ) ;
}
}
putchar( '\032' ) ;
return ;
}