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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * 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: * Redistribution and use in source and binary forms are permitted provided
9: * that: (1) source distributions retain this entire copyright notice and
10: * comment, and (2) distributions including binaries display the following
11: * acknowledgement: ``This product includes software developed by the
12: * University of California, Berkeley and its contributors'' in the
13: * documentation or other materials provided with the distribution and in
14: * all advertising materials mentioning features or use of this software.
15: * Neither the name of the University nor the names of its contributors may
16: * be used to endorse or promote products derived from this software without
17: * specific prior written permission.
18: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
19: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
20: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21: */
22:
23: #ifndef lint
24: static char sccsid[] = "@(#)parser5.c 3.13 (Berkeley) 6/6/90";
25: #endif /* not lint */
26:
27: #include "parser.h"
28: #include "var.h"
29:
30: /*
31: * unary $ $? + - ! ~
32: */
33: p_expr11(v, flag)
34: register struct value *v;
35: char flag;
36: {
37: int op;
38: char *opname;
39:
40: switch (token) {
41: case T_DOLLAR:
42: opname = "$";
43: break;
44: case T_DQ:
45: opname = "$?";
46: break;
47: case T_PLUS:
48: opname = "unary +";
49: break;
50: case T_MINUS:
51: opname = "unary -";
52: break;
53: case T_NOT:
54: opname = "!";
55: break;
56: case T_COMP:
57: opname = "~";
58: break;
59: default:
60: return p_expr12(v, flag);
61: }
62: op = token;
63: (void) s_gettok();
64: if (p_expr11(v, flag) < 0)
65: return -1;
66: switch (v->v_type) {
67: case V_NUM:
68: break;
69: case V_STR:
70: switch (op) {
71: case T_MINUS:
72: case T_NOT:
73: case T_COMP:
74: p_error("%s: Numeric operand required.", opname);
75: str_free(v->v_str);
76: v->v_type = V_ERR;
77: return 0;
78: }
79: break;
80: case V_ERR:
81: return 0;
82: }
83: switch (op) {
84: case T_DOLLAR:
85: case T_DQ:
86: if (v->v_type == V_NUM) {
87: int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
88: v->v_num > 0 && v->v_num <= cx.x_narg;
89: if (op == T_DQ)
90: v->v_num = tmp;
91: else if (tmp)
92: *v = cx.x_arg[v->v_num - 1];
93: else {
94: p_error("%d: No such argument.", v->v_num);
95: v->v_type = V_ERR;
96: }
97: } else {
98: char *name = v->v_str;
99: struct var *r = var_lookup(name);
100: if (op == T_DQ) {
101: v->v_type = V_NUM;
102: v->v_num = r != 0;
103: } else if (r != 0)
104: *v = r->r_val;
105: else {
106: p_error("%s: Undefined variable.", name);
107: v->v_type = V_ERR;
108: }
109: str_free(name);
110: }
111: if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
112: p_memerror();
113: return -1;
114: }
115: break;
116: case T_MINUS:
117: v->v_num = - v->v_num;
118: break;
119: case T_NOT:
120: v->v_num = ! v->v_num;
121: break;
122: case T_COMP:
123: v->v_num = ~ v->v_num;
124: break;
125: }
126: return 0;
127: }
128:
129: /*
130: * string, number, ( expr )
131: * Plus function calls.
132: *
133: * Always return v_type == V_ERR when flag == 0.
134: */
135: p_expr12(v, flag)
136: register struct value *v;
137: char flag;
138: {
139: v->v_type = V_ERR;
140: switch (token) {
141: case T_NUM:
142: if (flag) {
143: v->v_type = V_NUM;
144: v->v_num = token_num;
145: }
146: (void) s_gettok();
147: break;
148: case T_STR:
149: if (flag) {
150: v->v_type = V_STR;
151: v->v_str = token_str;
152: } else
153: str_free(token_str);
154: (void) s_gettok();
155: break;
156: case T_LP:
157: (void) s_gettok();
158: if (p_expr(v, flag) < 0) {
159: p_synerror();
160: return -1;
161: }
162: if (token != T_RP) {
163: p_synerror();
164: val_free(*v);
165: return -1;
166: }
167: (void) s_gettok();
168: break;
169: default:
170: return -1;
171: }
172: while (token == T_LP) {
173: char *cmd;
174:
175: if (p_convstr(v) < 0)
176: return -1;
177: cmd = v->v_type == V_STR ? v->v_str : 0;
178: if (p_function(cmd, v, flag) < 0) {
179: if (cmd)
180: str_free(cmd);
181: return -1;
182: }
183: if (cmd)
184: str_free(cmd);
185: }
186: return 0;
187: }
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