Racal Instruments 7064, Instruction Manual, Page: 49 / 179

Here is a summary of the queue access functions:
#include "vtl_rou.h"
/* G e t next "raw" char from secondary input queue.h.
Returns NO_CHAR if queue is empty. * 1
extern int vtl_getchar_raw(void);
/* G e t next "stripped" char from secondary input queue.
The upper 8 bits have been masked off.
Returns NO_CHAR i f queue is empty. * 1
extern int vtl_getchar(void);
/* R e t u r n s a character "ch" to the secondary input queue; the state of the upper 8
status bits is maintained.
Only a single character may be pushed back into the queue.
*1
extern int vtl_ungetc(int ch);
/* R e t u r n s a count of the number o f characters available i n the secondary input
queue. * 1
extern long in_stat(void)
/* R e t u r n s non-zero (TRUE) i f an EOI was asserted.
extern int eof(void)
4.6.4 Sample Application Parser
#include "vtl_rou.h"
void myParser(void)
int c;
1*
Echo characters received in the secondary queue to the output queue;
maintain EOI status on last char.
while ((c = getcharO) != NO_CHAR)
vtl_putchar(c, eof() 7 1 : 0);
4-20