Sweep-fix comparing pointers with 0 (and assigning 0 to pointers).
[games.git] / usr.bin / window / parser2.c
1 /*      @(#)parser2.c   8.1 (Berkeley) 6/6/93   */
2 /*      $NetBSD: parser2.c,v 1.11 2009/04/14 08:50:06 lukem Exp $       */
3
4 /*
5  * Copyright (c) 1983, 1993
6  *      The Regents of the University of California.  All rights reserved.
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Edward Wang at The University of California, Berkeley.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35
36 #define EXTERN
37 #include "ww.h"
38 #include "defs.h"
39 #include "alias.h"
40 #undef  EXTERN
41 #include "parser.h"
42 #include "var.h"
43 #include "lcmd.h"
44
45 /*
46  * name == 0 means we don't have a function name but
47  * want to parse the arguments anyway.  flag == 0 in this case.
48  */
49 int
50 p_function(const char *name, struct value *v, int flag)
51 {
52         struct value t;
53         struct lcmd_tab *c = NULL;
54         struct alias *a = NULL;
55         struct lcmd_arg *ap;                    /* this arg */
56         struct lcmd_arg *lp = NULL;             /* list arg */
57         int i;
58         struct value av[LCMD_NARG + 1];
59         struct value *vp;
60
61         if (name != NULL) {
62                 if ((c = lcmd_lookup(name)))
63                         name = c->lc_name;
64                 else if ((a = alias_lookup(name)))
65                         name = a->a_name;
66                 else {
67                         p_error("%s: No such command or alias.", name);
68                         flag = 0;
69                 }
70         }
71         for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
72                 vp->v_type = V_ERR;
73
74         if (token == T_LP)
75                 (void) s_gettok();
76         i = 0;
77         for (;;) {
78                 ap = NULL;
79                 vp = NULL;
80                 if (token == T_COMMA)           /* null argument */
81                         t.v_type = V_ERR;
82                 else {
83                         if (p_expr0(&t, flag) < 0)
84                                 break;
85                         if (t.v_type == V_ERR)
86                                 flag = 0;
87                 }
88                 if (token != T_ASSIGN) {
89                         if (i >= LCMD_NARG ||
90                             (c != NULL && (ap = lp) == NULL &&
91                             (ap = c->lc_arg + i)->arg_name == 0)) {
92                                 p_error("%s: Too many arguments.", name);
93                                 flag = 0;
94                         } else
95                                 vp = &av[i++];
96                 } else {
97                         char *tmp;
98                         if (p_convstr(&t) < 0)
99                                 goto abort;
100                         tmp = t.v_type == V_STR ? t.v_str : 0;
101                         (void) s_gettok();
102                         if (p_expr(&t, flag) < 0) {
103                                 if (tmp)
104                                         str_free(tmp);
105                                 p_synerror();
106                                 goto abort;
107                         }
108                         if (t.v_type == V_ERR)
109                                 flag = 0;
110                         if (tmp) {
111                                 if (c == NULL) {
112                                         /* an aliase */
113                                         p_error("%s: Bad alias syntax.", name);
114                                         flag = 0;
115                                 } else {
116                                         for (ap = c->lc_arg, vp = av;
117                                              ap != NULL && ap->arg_name != 0 &&
118                                              (*ap->arg_name == '\0' ||
119                                               !str_match(tmp, ap->arg_name,
120                                                         ap->arg_minlen));
121                                              ap++, vp++)
122                                                 ;
123                                         if (ap == NULL || ap->arg_name == 0) {
124                                                 p_error("%s: Unknown argument \"%s\".",
125                                                         name, tmp);
126                                                 flag = 0;
127                                                 ap = NULL;
128                                                 vp = NULL;
129                                         }
130                                 }
131                                 str_free(tmp);
132                         }
133                 }
134                 if (ap != NULL) {
135                         if (ap->arg_flags & ARG_LIST) {
136                                 i = vp - av + 1;
137                                 lp = ap;
138                         }
139                         if (vp && vp->v_type != V_ERR) {
140                                 if (*ap->arg_name)
141                                         p_error("%s: Argument %d (%s) duplicated.",
142                                                 name, (int)(vp - av + 1),
143                                                 ap->arg_name);
144                                 else
145                                         p_error("%s: Argument %d duplicated.",
146                                                 name, (int)(vp - av + 1));
147                                 flag = 0;
148                                 vp = NULL;
149                         } else if (t.v_type == V_ERR) {
150                                 /* do nothing */
151                         } else if (((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
152                                     t.v_type != V_NUM) ||
153                                    ((ap->arg_flags&ARG_TYPE) == ARG_STR &&
154                                    t.v_type != V_STR)) {
155                                 if (*ap->arg_name)
156                                         p_error("%s: Argument %d (%s) type mismatch.",
157                                                 name, (int)(vp - av + 1),
158                                                 ap->arg_name);
159                                 else
160                                         p_error("%s: Argument %d type mismatch.",
161                                                 name, (int)(vp - av + 1));
162                                 flag = 0;
163                                 vp = NULL;
164                         }
165                 }
166                 if (vp != NULL)
167                         *vp = t;
168                 else
169                         val_free(t);
170                 if (token == T_COMMA)
171                         (void) s_gettok();
172         }
173
174         if (p_erred())
175                 flag = 0;
176         if (token == T_RP)
177                 (void) s_gettok();
178         else if (token != T_EOL && token != T_EOF)
179                 flag = 0;               /* look for legal follow set */
180         v->v_type = V_ERR;
181         if (flag) {
182                 if (c != NULL)
183                         (*c->lc_func)(v, av);
184                 else {
185                         if (a->a_flags & A_INUSE)
186                                 p_error("%s: Recursive alias.", a->a_name);
187                         else {
188                                 a->a_flags |= A_INUSE;
189                                 if (dolongcmd(a->a_buf, av, i) < 0)
190                                         p_memerror();
191                                 a->a_flags &= ~A_INUSE;
192                         }
193                 }
194         }
195         if (p_abort()) {
196                 val_free(*v);
197                 v->v_type = V_ERR;
198                 goto abort;
199         }
200         for (vp = av; vp < &av[LCMD_NARG]; vp++)
201                 val_free(*vp);
202         return 0;
203 abort:
204         for (vp = av; vp < &av[LCMD_NARG]; vp++)
205                 val_free(*vp);
206         return -1;
207 }
208
209 int
210 p_assign(const char *name, struct value *v, int flag)
211 {
212         (void) s_gettok();
213
214         if (p_expr(v, flag) < 0) {
215                 p_synerror();
216                 return -1;
217         }
218         switch (v->v_type) {
219         case V_STR:
220         case V_NUM:
221                 if (name && flag && var_set(name, v) == 0) {
222                         p_memerror();
223                         val_free(*v);
224                         return -1;
225                 }
226                 break;
227         }
228         return 0;
229 }