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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_100
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140_01
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margin.c
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1985-03-10
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/* MARGIN.C 22nd Feb 1981
Prompts user to set margins on diablo daisy wheel printer,
for use with a cut sheet feeder
By Bill Bolton
Software Tools
P.O. Box 80
Newport Beach
NSW, 2106
Australia
*/
#define MINMARG 0
#define MAXMARG 156
#define MAXTAB 125
#define LSIDE '9'
#define RSIDE '0'
#define HT 0x09
#define ESC 0x1b
#define STDIN 0
#define STDOUT 1
#define LST 2
int odevice;
int idevice;
int ldevice;
main (argc,argv)
int argc;
char *argv[];
{
int lmargin;
int rmargin;
char lstr[6];
char rstr[6];
lmargin = 0; /* intialisation */
rmargin = 0;
odevice = STDOUT;
idevice = STDIN;
ldevice = LST;
sprintf(lstr,"left ");
sprintf(rstr,"right");
fprintf(odevice,"\n\tCopyright (C) 1981, Software Tools, Sydney,\
Australia.\n");
fprintf(odevice,"\tMARGIN Version 1.0 (Diablo)\n\n");
fprintf(odevice,"\tThis program sets the margins on a Diablo daisy\
wheel printer, margin\n");
fprintf(odevice,"\tpositions can only be set in the range 0 to %d\
from this program.\n\n\t",MAXMARG);
while (rmargin <= lmargin) {
fprintf(odevice,"Right margin must be greater than left\
margin.\n\n");
lmargin = get_margin(lstr);
rmargin = get_margin(rstr);
if (rmargin <= lmargin) {
fprintf(odevice,"\007\tRight margin error. ");
}
}
fprintf(odevice,"\n\tLeft margin is set to %d\n",lmargin);
fprintf(odevice,"\tRight margin is set to %d\n",rmargin);
set_margin(++lmargin,LSIDE);
set_margin(++rmargin,RSIDE);
putc('\r',ldevice);
}
/* prompts user for required margin, does range check and return margin */
get_margin(str)
char *str;
{
int margin;
char reply[8];
fprintf(odevice,"\tEnter position for %s margin : ",str);
fgets(reply,idevice);
margin = atoi(reply);
while (margin > MAXMARG || margin < MINMARG) {
fprintf(odevice,"\007\n\tMargin MUST be in the range 0\
to %d, renter.\n\n",MAXMARG);
margin = get_margin(str);
}
return(margin);
}
set_margin(margin,side)
int margin;
int side;
{
int i;
if(margin > MAXTAB) {
fprintf(ldevice,"%c%c%c",ESC,HT,MAXTAB);
for( i = 1; i <= (margin - MAXTAB); i++)
putc(' ',ldevice);
}
else {
fprintf(ldevice,"%c%c%c",ESC,HT,margin);
}
fprintf(ldevice,"%c%c",ESC,side);
}