date and time created 83/11/22 12:48:04 by edward

[unix-history] / usr / src / usr.bin / window / context.c

#ifndef lint
static	char *sccsid = "@(#)context.c	3.1 83/11/22";
#endif

#include <stdio.h>
#include "value.h"
#include "context.h"

/*
 * Context push/pop for nested command files.
 */

char *malloc();

cx_alloc()
{
	register struct context *xp;

	if (cx.x_type != 0) {
		xp = (struct context *)
			malloc(1, (unsigned) sizeof (struct context));
		if (xp == 0)
			return -1;
		*xp = cx;
		cx.x_link = xp;
		cx.x_type = 0;
	}
	cx.x_erred = 0;
	cx.x_synerred = 0;
	cx.x_abort = 0;
	return 0;
}

cx_free()
{
	if (cx.x_link != 0) {
		free(cx.x_link);
		cx = *cx.x_link;
	} else
		cx.x_type = 0;
}

cx_setfile(filename)
char *filename;
{
	if (cx_alloc() < 0)
		return -1;
	cx.x_type = X_FILE;
	if ((cx.x_filename = str_cpy(filename)) == 0)
		goto bad;
	cx.x_fp = fopen(filename, "r");
	if (cx.x_fp == 0)
		goto bad;
	cx.x_bol = 1;
	cx.x_lineno = 0;
	cx.x_errwin = 0;
	cx.x_baderr = 0;
	return 0;
bad:
	if (cx.x_filename != 0)
		str_free(cx.x_filename);
	cx_free();
	return -1;
}

cx_setbuf(buf)
char *buf;
{
	if (cx_alloc() < 0)
		return -1;
	cx.x_type = X_BUF;
	cx.x_bufp = cx.x_buf = buf;
	return 0;
}

cx_end()
{
	switch (cx.x_type) {
	case X_BUF:
		break;
	case X_FILE:
		(void) fclose(cx.x_fp);
		str_free(cx.x_filename);
		break;
	}
	cx_free();
}