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    Length: 1193 (0x4a9)
    Types: TextFile
    Names: »ioop.c«

└─⟦87ddcff64⟧ Bits:30001253 CPHDIST85 Tape, 1985 Autumn Conference Copenhagen
    └─⟦this⟧ »cph85dist/stage2/ioop.c« 

TextFile

/* ioop - Input/output routine for SIMCOMP
 *
 * status=ioop(op,chan,buf,ptr1,ptr2)
 *
 * See the book for details.
 *
*/

#include	<stdio.h>

#define	OK 0
#define	Eof 1
#define	ILLEGAL 2
#define	ERROR 3
#define	READ -1
#define	CONTROL 0
#define	WRITE 1
#define TRUE -1
#define FALSE 0
#define MAXCH 5

int ioop(op,chan,buf,ptr1,ptr2)

int	op,
	chan,
	buf[],
	*ptr1,
	*ptr2
;

{

static FILE *chanid[MAXCH] = {NULL,stdin,NULL,stdout,stderr};

int	tmp;

	switch(chan)
	{

	case 0:	return(op==READ? Eof : OK);
	case 1:	{
		if (op == CONTROL) return(OK);
		if (op == WRITE) return(ILLEGAL);
		goto streamin;
		}

	case 2:	{
		return(ILLEGAL);
		}

	case 3:	{
		if (op == CONTROL) return(OK);
		if (op == READ) return(ILLEGAL);
		goto streamout;
		}

	case 4: {
		if (op == CONTROL) return(OK);
		if (op == READ) return(ILLEGAL);
		goto streamout;
		}


	default:	return(ILLEGAL);
	}

streamin:
		*ptr2 = *ptr1;
		while(TRUE)
		 {
			if ((buf[*ptr2] = getc(chanid[chan])) == EOF)
			  return(Eof);
			if (buf[*ptr2] == '\n')
			  return(OK);
			(*ptr2)++;
		 }

streamout:

		tmp = *ptr1;
		while(tmp < *ptr2)
		 {
			putc(buf[tmp++],chanid[chan]);
		 }
		putc('\n',chanid[chan]);
		return(OK);
}