1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/*
** ASSIGNPR.C
**
** Multiple printer support with default to a single printer
** connected to the PRN device.
**
** Original Copyright 1988-1991 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is functionally identical to the
** version originally published by the author in Tech Specialist
** magazine and is hereby donated to the public domain.
*/
#include <stdio.h>
#define NUM_OF_PRNTRS 6
FILE *printer[NUM_OF_PRNTRS] = {stdprn};
/*
** assign_printer()
**
** Call with printer number and device name
**
** printer number should be in the range of 0 to NUM_OF_PRNTRS-1
** device should be "LPT1", "LPT2", "LPT3", "COM1", COM2", or a log file
**
** Returns 0 if successful, -1 if error
**
** Then do all printer output with fprintf(), fputs(), fputc(), etc.
** using printer[printer_number] as the output stream
*/
int cdecl assign_printer(int number, char *device)
{
FILE *fp;
if (NUM_OF_PRNTRS <= number || NULL == (fp = fopen(device, "w")))
return -1;
printer[number] = fp;
return 0;
}
#ifdef TEST /* Test code follows */
main()
{ /* Leave printer[0] = stdprn */
assign_printer(1, "CON"); /* Set printer[1] to the screen */
assign_printer(2, "p.log"); /* Set printer[2] to log file */
fputs("This is a printer test\n", printer[0]);
fputs("This is a screen test\n", printer[1]);
fputs("This is a log test\n", printer[2]);
}
#endif /* TEST */
|
