1/*	$NetBSD: parser2.c,v 1.10 2006/05/02 22:35:07 christos Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)parser2.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: parser2.c,v 1.10 2006/05/02 22:35:07 christos Exp $");
41#endif
42#endif /* not lint */
43
44#define EXTERN
45#include "ww.h"
46#include "defs.h"
47#include "alias.h"
48#undef  EXTERN
49#include "parser.h"
50#include "var.h"
51#include "lcmd.h"
52
53/*
54 * name == 0 means we don't have a function name but
55 * want to parse the arguments anyway.  flag == 0 in this case.
56 */
57int
58p_function(const char *name, struct value *v, int flag)
59{
60	struct value t;
61	struct lcmd_tab *c = 0;
62	struct alias *a = 0;
63	struct lcmd_arg *ap;			/* this arg */
64	struct lcmd_arg *lp = 0;		/* list arg */
65	int i;
66	struct value av[LCMD_NARG + 1];
67	struct value *vp;
68
69	if (name != 0) {
70		if ((c = lcmd_lookup(name)))
71			name = c->lc_name;
72		else if ((a = alias_lookup(name)))
73			name = a->a_name;
74		else {
75			p_error("%s: No such command or alias.", name);
76			flag = 0;
77		}
78	}
79	for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
80		vp->v_type = V_ERR;
81
82	if (token == T_LP)
83		(void) s_gettok();
84	i = 0;
85	for (;;) {
86		ap = 0;
87		vp = 0;
88		if (token == T_COMMA)		/* null argument */
89			t.v_type = V_ERR;
90		else {
91			if (p_expr0(&t, flag) < 0)
92				break;
93			if (t.v_type == V_ERR)
94				flag = 0;
95		}
96		if (token != T_ASSIGN) {
97			if (i >= LCMD_NARG ||
98			    (c != 0 && (ap = lp) == 0 &&
99			    (ap = c->lc_arg + i)->arg_name == 0)) {
100				p_error("%s: Too many arguments.", name);
101				flag = 0;
102			} else
103				vp = &av[i++];
104		} else {
105			char *tmp;
106			if (p_convstr(&t) < 0)
107				goto abort;
108			tmp = t.v_type == V_STR ? t.v_str : 0;
109			(void) s_gettok();
110			if (p_expr(&t, flag) < 0) {
111				if (tmp)
112					str_free(tmp);
113				p_synerror();
114				goto abort;
115			}
116			if (t.v_type == V_ERR)
117				flag = 0;
118			if (tmp) {
119				if (c == 0) {
120					/* an aliase */
121					p_error("%s: Bad alias syntax.", name);
122					flag = 0;
123				} else {
124					for (ap = c->lc_arg, vp = av;
125					     ap != 0 && ap->arg_name != 0 &&
126					     (*ap->arg_name == '\0' ||
127					      !str_match(tmp, ap->arg_name,
128							ap->arg_minlen));
129					     ap++, vp++)
130						;
131					if (ap == 0 || ap->arg_name == 0) {
132						p_error("%s: Unknown argument \"%s\".",
133							name, tmp);
134						flag = 0;
135						ap = 0;
136						vp = 0;
137					}
138				}
139				str_free(tmp);
140			}
141		}
142		if (ap != 0) {
143			if (ap->arg_flags & ARG_LIST) {
144				i = vp - av + 1;
145				lp = ap;
146			}
147			if (vp && vp->v_type != V_ERR) {
148				if (*ap->arg_name)
149					p_error("%s: Argument %d (%s) duplicated.",
150						name, (int)(vp - av + 1),
151						ap->arg_name);
152				else
153					p_error("%s: Argument %d duplicated.",
154						name, (int)(vp - av + 1));
155				flag = 0;
156				vp = 0;
157			} else if (t.v_type == V_ERR) {
158				/* do nothing */
159			} else if (((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
160				    t.v_type != V_NUM) ||
161				   ((ap->arg_flags&ARG_TYPE) == ARG_STR &&
162				   t.v_type != V_STR)) {
163				if (*ap->arg_name)
164					p_error("%s: Argument %d (%s) type mismatch.",
165						name, (int)(vp - av + 1),
166						ap->arg_name);
167				else
168					p_error("%s: Argument %d type mismatch.",
169						name, (int)(vp - av + 1));
170				flag = 0;
171				vp = 0;
172			}
173		}
174		if (vp != 0)
175			*vp = t;
176		else
177			val_free(t);
178		if (token == T_COMMA)
179			(void) s_gettok();
180	}
181
182	if (p_erred())
183		flag = 0;
184	if (token == T_RP)
185		(void) s_gettok();
186	else if (token != T_EOL && token != T_EOF)
187		flag = 0;		/* look for legal follow set */
188	v->v_type = V_ERR;
189	if (flag) {
190		if (c != 0)
191			(*c->lc_func)(v, av);
192		else {
193			if (a->a_flags & A_INUSE)
194				p_error("%s: Recursive alias.", a->a_name);
195			else {
196				a->a_flags |= A_INUSE;
197				if (dolongcmd(a->a_buf, av, i) < 0)
198					p_memerror();
199				a->a_flags &= ~A_INUSE;
200			}
201		}
202	}
203	if (p_abort()) {
204		val_free(*v);
205		v->v_type = V_ERR;
206		goto abort;
207	}
208	for (vp = av; vp < &av[LCMD_NARG]; vp++)
209		val_free(*vp);
210	return 0;
211abort:
212	for (vp = av; vp < &av[LCMD_NARG]; vp++)
213		val_free(*vp);
214	return -1;
215}
216
217int
218p_assign(const char *name, struct value *v, int flag)
219{
220	(void) s_gettok();
221
222	if (p_expr(v, flag) < 0) {
223		p_synerror();
224		return -1;
225	}
226	switch (v->v_type) {
227	case V_STR:
228	case V_NUM:
229		if (name && flag && var_set(name, v) == 0) {
230			p_memerror();
231			val_free(*v);
232			return -1;
233		}
234		break;
235	}
236	return 0;
237}
238