+++ /dev/null
-/* $NetBSD: parser1.c,v 1.4 1997/11/21 08:36:11 lukem Exp $ */
-
-/*
- * Copyright (c) 1983, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Edward Wang at The University of California, Berkeley.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-#ifndef lint
-#if 0
-static char sccsid[] = "@(#)parser1.c 8.1 (Berkeley) 6/6/93";
-#else
-__RCSID("$NetBSD: parser1.c,v 1.4 1997/11/21 08:36:11 lukem Exp $");
-#endif
-#endif /* not lint */
-
-#include "defs.h"
-#include "parser.h"
-
-void
-p_start()
-{
- char flag = 1;
-
- (void) s_gettok();
- for (;;) {
- p_statementlist(flag);
- if (token == T_EOF || p_abort())
- break;
- flag = 0;
- p_synerror();
- while (token != T_EOL && token != T_EOF) {
- if (token == T_STR)
- str_free(token_str);
- (void) s_gettok();
- }
- if (token == T_EOL)
- (void) s_gettok();
- p_clearerr();
- }
-}
-
-void
-p_statementlist(flag)
- char flag;
-{
- for (; p_statement(flag) >= 0; p_clearerr())
- ;
-}
-
-int
-p_statement(flag)
- char flag;
-{
- switch (token) {
- case T_EOL:
- (void) s_gettok();
- return 0;
- case T_IF:
- return p_if(flag);
- default:
- return p_expression(flag);
- }
-}
-
-int
-p_if(flag)
- char flag;
-{
- struct value t;
- char true = 0;
-
-top:
- (void) s_gettok();
-
- if (p_expr(&t, flag) < 0) {
- p_synerror();
- return -1;
- }
- switch (t.v_type) {
- case V_NUM:
- true = !true && t.v_num != 0;
- break;
- case V_STR:
- p_error("if: Numeric value required.");
- str_free(t.v_str);
- case V_ERR:
- flag = 0;
- break;
- }
-
- if (token != T_THEN) {
- p_synerror();
- return -1;
- }
-
- (void) s_gettok();
- p_statementlist(flag && true);
- if (p_erred())
- return -1;
-
- if (token == T_ELSIF)
- goto top;
-
- if (token == T_ELSE) {
- (void) s_gettok();
- p_statementlist(flag && !true);
- if (p_erred())
- return -1;
- }
-
- if (token == T_ENDIF) {
- (void) s_gettok();
- return 0;
- }
-
- p_synerror();
- return -1;
-}
-
-int
-p_expression(flag)
- char flag;
-{
- struct value t;
- char *cmd;
-
- switch (token) {
- case T_NUM:
- t.v_type = V_NUM;
- t.v_num = token_num;
- (void) s_gettok();
- break;
- case T_STR:
- t.v_type = V_STR;
- t.v_str = token_str;
- (void) s_gettok();
- break;
- default:
- if (p_expr(&t, flag) < 0)
- return -1;
- if (token == T_EOF) {
- val_free(t);
- return 0;
- }
- }
- if (token != T_ASSIGN && p_convstr(&t) < 0)
- return -1;
- cmd = t.v_type == V_STR ? t.v_str : 0;
- if ((*(token == T_ASSIGN ? p_assign : p_function))(cmd, &t, flag) < 0) {
- if (cmd)
- str_free(cmd);
- return -1;
- }
- if (cmd)
- str_free(cmd);
- val_free(t);
- if (token == T_EOL)
- (void) s_gettok();
- else if (token != T_EOF) {
- p_synerror();
- return -1;
- }
- return 0;
-}
-
-int
-p_convstr(v)
- struct value *v;
-{
- if (v->v_type != V_NUM)
- return 0;
- if ((v->v_str = str_itoa(v->v_num)) == 0) {
- p_memerror();
- v->v_type = V_ERR;
- return -1;
- }
- v->v_type = V_STR;
- return 0;
-}
-
-void
-p_synerror()
-{
- if (!cx.x_synerred) {
- cx.x_synerred = cx.x_erred = 1;
- error("Syntax error.");
- }
-}
-
-void
-#if __STDC__
-p_error(const char *msg, ...)
-#else
-p_error(msg, ..)
- char *msg;
- va_dcl
-#endif
-{
- va_list ap;
-#if __STDC__
- va_start(ap, msg);
-#else
- va_start(ap);
-#endif
- if (!cx.x_erred) {
- cx.x_erred = 1;
- verror(msg, ap);
- }
- va_end(ap);
-}
-
-void
-p_memerror()
-{
- cx.x_erred = cx.x_abort = 1;
- error("Out of memory.");
-}
projects / apple / shell_cmds.git / blobdiff