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// Review a Tektronix vector file.
// from 'scan', by Clair Nielsen, LANL.
// Modifications by Maurice LeBrun, IFS.
//
// This version works well with xterm and at least one vt100/tek emulator
// I've tried.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
static void describe( void );
static void tek_mode( int mode );
#define ESC 27 // ESCape character
#define ALPHA_MODE 0 // switch to alpha mode
#define GRAPH_MODE 1 // switch to graph mode
#define BUFSZ 1024
#define MAXPAGES 1024
enum { unknown, xterm, tekterm } termtype = unknown;
int
main( int argc, char *argv[] )
{
FILE *fd;
int i, npage, ipage, ifirst, oldpage;
size_t j, nb;
int istop;
long start[MAXPAGES]; // start (offset) of each page
char buf[BUFSZ], xtra, lastchar = '\0';
char c, ibuf[128], *t;
if ( argc < 2 )
{
describe();
exit( 1 );
}
if ( ( fd = fopen( argv[1], "r" ) ) == NULL )
{
printf( "Cannot open %s\n", argv[1] );
exit( 1 );
}
if ( ( t = getenv( "TERM" ) ) != NULL )
{
if ( strcmp( "xterm", t ) == 0 )
{
termtype = xterm;
}
else if ( !strncmp( "tek", t, 3 ) ||
!strncmp( "401", t, 3 ) ||
!strncmp( "410", t, 3 ) )
{
termtype = tekterm;
}
}
// Find out how many pages there are in file.
ipage = 0;
start[0] = 0;
for ( i = 0; i < MAXPAGES; i++ )
{
nb = fread( buf, 1, BUFSZ, fd );
if ( nb == 0 )
break;
ifirst = 0;
for ( j = 0; j < nb; j++ )
{
if ( ( lastchar = buf[j] ) == '\f' )
{
ifirst = (int) j - 1;
ipage++;
start[ipage] = BUFSZ * i + ifirst + 2;
}
}
}
// don't count a FF at the end of the file as a separate page
if ( lastchar == '\f' )
ipage--;
npage = ipage + 1;
// Loop until the user quits
ipage = 0;
while ( 1 )
{
oldpage = ipage;
printf( "Page %d/%d> ", ipage, npage );
if ( !fgets( ibuf, 128, stdin ) )
break;
c = ibuf[0];
// User input a page number or a return
// A carriage return in response to the prompt proceeds to the next page.
if ( c == '\n' ) // CR = increment by one page
{
ipage++;
}
else if ( c == '+' ) // +<n> = increment by <n> pages
{
ipage += atoi( ibuf + 1 );
}
else if ( c == '-' ) // -<n> = decrement by <n> pages
{
ipage -= atoi( ibuf + 1 );
}
else if ( isdigit( c ) ) // <n> = goto page <n>
{
ipage = atoi( ibuf );
}
else if ( c == '\f' )
{
; // FF = redraw the last plot
}
else if ( c == 'q' ) // q = quit
{
break;
}
else // h, ? or garbage = give help
{
tek_mode( ALPHA_MODE );
describe();
continue;
}
// Bounds checking
if ( ipage > npage )
{
ipage = npage;
if ( ipage == oldpage )
continue;
}
else if ( ipage < 0 )
{
ipage = 1;
}
else if ( ipage == 0 )
{
continue; // page 0 does not exist
}
// Time to actually plot something.
tek_mode( GRAPH_MODE );
istop = fseek( fd, start[ipage - 1], 0 );
xtra = '\0';
istop = 0;
for ( i = 0; i < 8196; i++ ) // less than 8MB per page!
{
if ( xtra )
{
if ( fwrite( &xtra, 1, 1, stdout ) != 1 )
{
fprintf( stderr, "Error writing to stdout\n" );
exit( 1 );
}
xtra = '\0';
}
nb = fread( buf, 1, BUFSZ, fd );
if ( nb == 0 )
break;
for ( j = 0; j < nb; j++ )
{
if ( buf[j] == '\f' )
{
if ( fwrite( &buf[0], 1, j, stdout ) != j )
{
fprintf( stderr, "Error writing to stdout\n" );
exit( 1 );
}
fflush( stdout );
istop = 1;
break;
}
}
if ( istop )
break;
if ( buf[nb] == ESC )
{
xtra = ESC;
j--;
}
if ( fwrite( &buf[0], 1, j, stdout ) != j )
{
fprintf( stderr, "Error writing to stdout\n" );
exit( 1 );
}
}
if ( termtype == xterm )
tek_mode( ALPHA_MODE );
}
tek_mode( ALPHA_MODE ); // how to kill an xterm Tek window?
fclose( fd );
exit( 0 );
}
//--------------------------------------------------------------------------
// tek_mode()
//
// switch to alpha/graph mode
//--------------------------------------------------------------------------
static int currentmode = ALPHA_MODE;
static void
tek_mode( int mode )
{
if ( mode == GRAPH_MODE )
{
if ( currentmode == ALPHA_MODE )
{
switch ( termtype )
{
case tekterm:
break;
case xterm:
printf( "\033[?38h" ); // open graphics window
break;
default:
printf( "\033[?38h" ); // open graphics window
}
printf( "\035" ); // Enter Vector mode = GS
}
printf( "\033\f" ); // clear screen = ESC FF
fflush( stdout );
currentmode = mode;
}
else if ( mode == ALPHA_MODE )
{
switch ( termtype )
{
case tekterm:
printf( "\037\030" ); // Enter Alpha mode = US CAN
break;
case xterm:
printf( "\033\003" ); // VT mode (xterm) = ESC ETX
break;
default:
printf( "\033\003" ); // VT mode (xterm) = ESC ETX
}
fflush( stdout );
currentmode = mode;
}
}
//--------------------------------------------------------------------------
// describe()
//
// Print help message.
// Note: if this message starts to exceed 512 bytes, may need to split
// since some compilers can't handle strings that long.
//--------------------------------------------------------------------------
static void
describe( void )
{
fputs( "\
Usage: pltek filename \n\
At the prompt, the following replies are recognized:\n\
h,? Give this help message.\n\
q Quit program.\n\
<n> Go to the specified page number.\n\
-<n> Go back <n> pages.\n\
+<n> Go forward <n> pages.\n\
<Return> Go to the next page.\n\n",
stdout );
}
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