SysIII/usr/src/lib/libc/pdp11/stdio/fdopen.c

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/*LINTLIBRARY*/
/*
 * Unix routine to do an "fopen" on file descriptor
 * The mode has to be repeated because you can't query its
 * status
 */

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

FILE *
fdopen(fd, mode)
register char *mode;
{
	register FILE *iop;
	FILE *_findiop();

	if((iop = _findiop()) == NULL)
		return(NULL);

	iop->_cnt = 0;
	iop->_file = fd;
	switch(*mode) {

		case 'r':
			iop->_flag |= _IOREAD;
			break;

		case 'a':
			lseek(fd, 0L, 2);
			/* No break */
		case 'w':
			iop->_flag |= _IOWRT;
			break;

		default:
			return(NULL);
	}

	if(mode[1] == '+') {
		iop->_flag &= ~(_IOREAD | _IOWRT);
		iop->_flag |= _IORW;
	}

	return(iop);
}