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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: */
17:
18: #ifndef lint
19: static char sccsid[] = "@(#)parser5.c 3.11 (Berkeley) 6/29/88";
20: #endif /* not lint */
21:
22: #include "parser.h"
23: #include "var.h"
24:
25: /*
26: * unary $ $? + - ! ~
27: */
28: p_expr11(v, flag)
29: register struct value *v;
30: char flag;
31: {
32: int op;
33: char *opname;
34:
35: switch (token) {
36: case T_DOLLAR:
37: opname = "$";
38: break;
39: case T_DQ:
40: opname = "$?";
41: break;
42: case T_PLUS:
43: opname = "unary +";
44: break;
45: case T_MINUS:
46: opname = "unary -";
47: break;
48: case T_NOT:
49: opname = "!";
50: break;
51: case T_COMP:
52: opname = "~";
53: break;
54: default:
55: return p_expr12(v, flag);
56: }
57: op = token;
58: (void) s_gettok();
59: if (p_expr11(v, flag) < 0)
60: return -1;
61: switch (v->v_type) {
62: case V_NUM:
63: break;
64: case V_STR:
65: switch (op) {
66: case T_MINUS:
67: case T_NOT:
68: case T_COMP:
69: p_error("%s: Numeric operand required.", opname);
70: str_free(v->v_str);
71: v->v_type = V_ERR;
72: return 0;
73: }
74: break;
75: case V_ERR:
76: return 0;
77: }
78: switch (op) {
79: case T_DOLLAR:
80: case T_DQ:
81: if (v->v_type == V_NUM) {
82: int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
83: v->v_num > 0 && v->v_num <= cx.x_narg;
84: if (op == T_DQ)
85: v->v_num = tmp;
86: else if (tmp)
87: *v = cx.x_arg[v->v_num - 1];
88: else {
89: p_error("%d: No such argument.", v->v_num);
90: v->v_type = V_ERR;
91: }
92: } else {
93: char *name = v->v_str;
94: struct var *r = var_lookup(name);
95: if (op == T_DQ) {
96: v->v_type = V_NUM;
97: v->v_num = r != 0;
98: } else if (r != 0)
99: *v = r->r_val;
100: else {
101: p_error("%s: Undefined variable.", name);
102: v->v_type = V_ERR;
103: }
104: str_free(name);
105: }
106: if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
107: p_memerror();
108: return -1;
109: }
110: break;
111: case T_MINUS:
112: v->v_num = - v->v_num;
113: break;
114: case T_NOT:
115: v->v_num = ! v->v_num;
116: break;
117: case T_COMP:
118: v->v_num = ~ v->v_num;
119: break;
120: }
121: return 0;
122: }
123:
124: /*
125: * string, number, ( expr )
126: * Plus function calls.
127: *
128: * Always return v_type == V_ERR when flag == 0.
129: */
130: p_expr12(v, flag)
131: register struct value *v;
132: char flag;
133: {
134: v->v_type = V_ERR;
135: switch (token) {
136: case T_NUM:
137: if (flag) {
138: v->v_type = V_NUM;
139: v->v_num = token_num;
140: }
141: (void) s_gettok();
142: break;
143: case T_STR:
144: if (flag) {
145: v->v_type = V_STR;
146: v->v_str = token_str;
147: } else
148: str_free(token_str);
149: (void) s_gettok();
150: break;
151: case T_LP:
152: (void) s_gettok();
153: if (p_expr(v, flag) < 0) {
154: p_synerror();
155: return -1;
156: }
157: if (token != T_RP) {
158: p_synerror();
159: val_free(*v);
160: return -1;
161: }
162: (void) s_gettok();
163: break;
164: default:
165: return -1;
166: }
167: while (token == T_LP) {
168: char *cmd;
169:
170: if (p_convstr(v) < 0)
171: return -1;
172: cmd = v->v_type == V_STR ? v->v_str : 0;
173: if (p_function(cmd, v, flag) < 0) {
174: if (cmd)
175: str_free(cmd);
176: return -1;
177: }
178: if (cmd)
179: str_free(cmd);
180: }
181: return 0;
182: }
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