1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Edward Wang at The University of California, Berkeley.
7 *
8 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 static char sccsid[] = "@(#)parser2.c 8.1 (Berkeley) 06/06/93";
13 #endif /* not lint */
14
15 #include "parser.h"
16 #include "var.h"
17 #include "lcmd.h"
18 #include "alias.h"
19
20 /*
21 * name == 0 means we don't have a function name but
22 * want to parse the arguments anyway. flag == 0 in this case.
23 */
p_function(name,v,flag)24 p_function(name, v, flag)
25 char *name;
26 register struct value *v;
27 {
28 struct value t;
29 register struct lcmd_tab *c = 0;
30 register struct alias *a = 0;
31 register struct lcmd_arg *ap; /* this arg */
32 struct lcmd_arg *lp = 0; /* list arg */
33 register i;
34 struct value av[LCMD_NARG + 1];
35 register struct value *vp;
36
37 if (name != 0)
38 if (c = lcmd_lookup(name))
39 name = c->lc_name;
40 else if (a = alias_lookup(name))
41 name = a->a_name;
42 else {
43 p_error("%s: No such command or alias.", name);
44 flag = 0;
45 }
46
47 for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
48 vp->v_type = V_ERR;
49
50 if (token == T_LP)
51 (void) s_gettok();
52 i = 0;
53 for (;;) {
54 ap = 0;
55 vp = 0;
56 if (token == T_COMMA) /* null argument */
57 t.v_type = V_ERR;
58 else {
59 if (p_expr0(&t, flag) < 0)
60 break;
61 if (t.v_type == V_ERR)
62 flag = 0;
63 }
64 if (token != T_ASSIGN) {
65 if (i >= LCMD_NARG ||
66 c != 0 && (ap = lp) == 0 &&
67 (ap = c->lc_arg + i)->arg_name == 0) {
68 p_error("%s: Too many arguments.", name);
69 flag = 0;
70 } else
71 vp = &av[i++];
72 } else {
73 char *tmp;
74 if (p_convstr(&t) < 0)
75 goto abort;
76 tmp = t.v_type == V_STR ? t.v_str : 0;
77 (void) s_gettok();
78 if (p_expr(&t, flag) < 0) {
79 if (tmp)
80 str_free(tmp);
81 p_synerror();
82 goto abort;
83 }
84 if (t.v_type == V_ERR)
85 flag = 0;
86 if (tmp) {
87 if (c == 0) {
88 /* an aliase */
89 p_error("%s: Bad alias syntax.", name);
90 flag = 0;
91 } else {
92 for (ap = c->lc_arg, vp = av;
93 ap != 0 && ap->arg_name != 0 &&
94 (*ap->arg_name == '\0' ||
95 !str_match(tmp, ap->arg_name,
96 ap->arg_minlen));
97 ap++, vp++)
98 ;
99 if (ap == 0 || ap->arg_name == 0) {
100 p_error("%s: Unknown argument \"%s\".",
101 name, tmp);
102 flag = 0;
103 ap = 0;
104 vp = 0;
105 }
106 }
107 str_free(tmp);
108 }
109 }
110 if (ap != 0) {
111 if (ap->arg_flags & ARG_LIST) {
112 i = vp - av + 1;
113 lp = ap;
114 }
115 if (vp->v_type != V_ERR) {
116 if (*ap->arg_name)
117 p_error("%s: Argument %d (%s) duplicated.",
118 name, vp - av + 1,
119 ap->arg_name);
120 else
121 p_error("%s: Argument %d duplicated.",
122 name, vp - av + 1);
123 flag = 0;
124 vp = 0;
125 } else if (t.v_type == V_ERR) {
126 /* do nothing */
127 } else if ((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
128 t.v_type != V_NUM ||
129 (ap->arg_flags&ARG_TYPE) == ARG_STR &&
130 t.v_type != V_STR) {
131 if (*ap->arg_name)
132 p_error("%s: Argument %d (%s) type mismatch.",
133 name, vp - av + 1,
134 ap->arg_name);
135 else
136 p_error("%s: Argument %d type mismatch.",
137 name, vp - av + 1);
138 flag = 0;
139 vp = 0;
140 }
141 }
142 if (vp != 0)
143 *vp = t;
144 else
145 val_free(t);
146 if (token == T_COMMA)
147 (void) s_gettok();
148 }
149
150 if (p_erred())
151 flag = 0;
152 if (token == T_RP)
153 (void) s_gettok();
154 else if (token != T_EOL && token != T_EOF)
155 flag = 0; /* look for legal follow set */
156 v->v_type = V_ERR;
157 if (flag)
158 if (c != 0)
159 (*c->lc_func)(v, av);
160 else
161 if (a->a_flags & A_INUSE)
162 p_error("%s: Recursive alias.", a->a_name);
163 else {
164 a->a_flags |= A_INUSE;
165 if (dolongcmd(a->a_buf, av, i) < 0)
166 p_memerror();
167 a->a_flags &= ~A_INUSE;
168 }
169 if (p_abort()) {
170 val_free(*v);
171 v->v_type = V_ERR;
172 goto abort;
173 }
174 for (vp = av; vp < &av[LCMD_NARG]; vp++)
175 val_free(*vp);
176 return 0;
177 abort:
178 for (vp = av; vp < &av[LCMD_NARG]; vp++)
179 val_free(*vp);
180 return -1;
181 }
182
p_assign(name,v,flag)183 p_assign(name, v, flag)
184 char *name;
185 struct value *v;
186 char flag;
187 {
188 (void) s_gettok();
189
190 if (p_expr(v, flag) < 0) {
191 p_synerror();
192 return -1;
193 }
194 switch (v->v_type) {
195 case V_STR:
196 case V_NUM:
197 if (flag && var_set(name, v) == 0) {
198 p_memerror();
199 val_free(*v);
200 return -1;
201 }
202 break;
203 }
204 return 0;
205 }
206