[unix-history] / usr / src / libc / stdio / fopen.c

#include	<stdio.h>
#include	<errno.h>

FILE *
fopen(file, mode)
char *file;
register char *mode;
{
	extern int errno;
	register f;
	register FILE *iop;
	extern FILE *_lastbuf;

	for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT); iop++)
		if (iop >= _lastbuf)
			return(NULL);
	if (*mode=='w')
		f = creat(file, 0666);
	else if (*mode=='a') {
		if ((f = open(file, 1)) < 0) {
			if (errno == ENOENT)
				f = creat(file, 0666);
		}
		lseek(f, 0L, 2);
	} else
		f = open(file, 0);
	if (f < 0)
		return(NULL);
	iop->_cnt = 0;
	iop->_file = f;
	if (*mode != 'r')
		iop->_flag |= _IOWRT;
	else
		iop->_flag |= _IOREAD;
	return(iop);
}
Commit	Line	Data
2c344bd0 TL	1	#include <stdio.h>
	2	#include <errno.h>
	3
	4	FILE *
	5	fopen(file, mode)
	6	char *file;
	7	register char *mode;
	8	{
	9	extern int errno;
	10	register f;
	11	register FILE *iop;
	12	extern FILE *_lastbuf;
	13
	14	for (iop = _iob; iop->_flag&(_IOREAD\|_IOWRT); iop++)
	15	if (iop >= _lastbuf)
	16	return(NULL);
	17	if (*mode=='w')
	18	f = creat(file, 0666);
	19	else if (*mode=='a') {
	20	if ((f = open(file, 1)) < 0) {
	21	if (errno == ENOENT)
	22	f = creat(file, 0666);
	23	}
	24	lseek(f, 0L, 2);
	25	} else
	26	f = open(file, 0);
	27	if (f < 0)
	28	return(NULL);
	29	iop->_cnt = 0;
	30	iop->_file = f;
	31	if (*mode != 'r')
	32	iop->_flag \|= _IOWRT;
	33	else
	34	iop->_flag \|= _IOREAD;
	35	return(iop);
	36	}