131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)context.c 3.12 (Berkeley) 6/6/90";*/
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static char rcsid[] = "$Id: context.c,v 1.2 1993/08/01 18:02:23 mycroft Exp $";
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#endif /* not lint */
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#include "value.h"
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#include "string.h"
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#include "context.h"
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/*
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* Context push/pop for nested command files.
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*/
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char *malloc();
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cx_alloc()
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{
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register struct context *xp;
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if (cx.x_type != 0) {
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xp = (struct context *)
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malloc((unsigned) sizeof (struct context));
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if (xp == 0)
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return -1;
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*xp = cx;
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cx.x_link = xp;
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cx.x_type = 0;
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}
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cx.x_erred = 0;
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cx.x_synerred = 0;
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cx.x_abort = 0;
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return 0;
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}
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cx_free()
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{
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struct context *xp;
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if ((xp = cx.x_link) != 0) {
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cx = *xp;
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free((char *)xp);
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} else
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cx.x_type = 0;
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}
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cx_beginfile(filename)
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char *filename;
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{
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if (cx_alloc() < 0)
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return -1;
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cx.x_type = X_FILE;
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if ((cx.x_filename = str_cpy(filename)) == 0)
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goto bad;
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cx.x_fp = fopen(filename, "r");
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if (cx.x_fp == 0)
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goto bad;
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cx.x_bol = 1;
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cx.x_lineno = 0;
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cx.x_errwin = 0;
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cx.x_noerr = 0;
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return 0;
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bad:
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if (cx.x_filename != 0)
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str_free(cx.x_filename);
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cx_free();
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return -1;
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}
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cx_beginbuf(buf, arg, narg)
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char *buf;
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struct value *arg;
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int narg;
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{
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if (cx_alloc() < 0)
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return -1;
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cx.x_type = X_BUF;
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cx.x_bufp = cx.x_buf = buf;
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cx.x_arg = arg;
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cx.x_narg = narg;
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return 0;
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}
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cx_end()
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{
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switch (cx.x_type) {
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case X_BUF:
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break;
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case X_FILE:
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(void) fclose(cx.x_fp);
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str_free(cx.x_filename);
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break;
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}
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cx_free();
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}
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