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60de5df9 | 1 | /* |
46e9ea25 KB |
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 this notice is preserved and that due credit is given | |
7 | * to the University of California at Berkeley. The name of the University | |
8 | * may not be used to endorse or promote products derived from this | |
9 | * software without specific prior written permission. This software | |
10 | * is provided ``as is'' without express or implied warranty. | |
60de5df9 EW |
11 | */ |
12 | ||
46e9ea25 KB |
13 | #ifndef lint |
14 | static char sccsid[] = "@(#)parser3.c 3.6 (Berkeley) %G%"; | |
15 | #endif /* not lint */ | |
16 | ||
6c6eaf9a EW |
17 | #include "parser.h" |
18 | ||
19 | /* | |
20 | * = | |
21 | * ? : | |
22 | * || | |
23 | * && | |
24 | * | | |
25 | * ^ | |
26 | * & | |
27 | * == != | |
28 | * <= >= | |
29 | * << >> | |
30 | * + - | |
31 | * * / % | |
32 | * unary - + ~ ! | |
33 | */ | |
34 | p_expr(v, flag) | |
35 | register struct value *v; | |
36 | char flag; | |
37 | { | |
38 | struct value t; | |
39 | int ret; | |
40 | ||
6c6eaf9a EW |
41 | if (p_expr0(&t, flag) < 0) |
42 | return -1; | |
43 | ||
44 | if (token != T_ASSIGN) { | |
45 | *v = t; | |
46 | return 0; | |
47 | } | |
48 | switch (t.v_type) { | |
bb4a0c0b EW |
49 | case V_NUM: |
50 | p_error("%d: Not a variable.", t.v_num); | |
6c6eaf9a EW |
51 | case V_ERR: |
52 | t.v_str = 0; | |
53 | break; | |
6c6eaf9a EW |
54 | } |
55 | ret = p_assign(t.v_str, v, flag); | |
56 | if (t.v_str != 0) | |
57 | str_free(t.v_str); | |
58 | return ret; | |
59 | } | |
60 | ||
61 | /* | |
62 | * ? : | |
63 | */ | |
64 | p_expr0(v, flag) | |
65 | register struct value *v; | |
66 | char flag; | |
67 | { | |
68 | struct value t; | |
69 | char true; | |
70 | ||
71 | if (p_expr1(v, flag) < 0) | |
72 | return -1; | |
73 | if (token != T_QUEST) | |
74 | return 0; | |
75 | switch (v->v_type) { | |
76 | case V_NUM: | |
77 | true = v->v_num != 0; | |
78 | break; | |
79 | case V_STR: | |
fbbe9777 | 80 | p_error("?: Numeric left operand required."); |
6c6eaf9a EW |
81 | str_free(v->v_str); |
82 | v->v_type = V_ERR; | |
83 | case V_ERR: | |
84 | flag = 0; | |
85 | break; | |
86 | } | |
87 | (void) s_gettok(); | |
88 | v->v_type = V_ERR; | |
89 | if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) | |
90 | return -1; | |
91 | if (token != T_COLON) { | |
92 | val_free(*v); | |
93 | p_synerror(); | |
94 | return -1; | |
95 | } | |
96 | (void) s_gettok(); | |
97 | return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); | |
98 | } | |
99 | ||
100 | /* | |
101 | * || | |
102 | */ | |
103 | p_expr1(v, flag) | |
104 | register struct value *v; | |
105 | char flag; | |
106 | { | |
107 | char true = 0; | |
108 | ||
109 | if (p_expr2(v, flag) < 0) | |
110 | return -1; | |
111 | if (token != T_OROR) | |
112 | return 0; | |
113 | for (;;) { | |
114 | switch (v->v_type) { | |
115 | case V_NUM: | |
116 | v->v_num = true = true || v->v_num != 0; | |
117 | break; | |
118 | case V_STR: | |
fbbe9777 | 119 | p_error("||: Numeric operands required."); |
6c6eaf9a EW |
120 | str_free(v->v_str); |
121 | v->v_type = V_ERR; | |
122 | case V_ERR: | |
123 | flag = 0; | |
124 | break; | |
125 | } | |
126 | if (token != T_OROR) | |
127 | return 0; | |
128 | (void) s_gettok(); | |
129 | if (p_expr2(v, flag && !true) < 0) | |
130 | return -1; | |
131 | } | |
132 | } | |
133 | ||
134 | /* | |
135 | * && | |
136 | */ | |
137 | p_expr2(v, flag) | |
138 | register struct value *v; | |
139 | char flag; | |
140 | { | |
141 | char true = 1; | |
142 | ||
143 | if (p_expr3_10(3, v, flag) < 0) | |
144 | return -1; | |
145 | if (token != T_ANDAND) | |
146 | return 0; | |
147 | for (;;) { | |
148 | switch (v->v_type) { | |
149 | case V_NUM: | |
150 | v->v_num = true = true && v->v_num != 0; | |
151 | break; | |
152 | case V_STR: | |
fbbe9777 | 153 | p_error("&&: Numeric operands required."); |
6c6eaf9a EW |
154 | str_free(v->v_str); |
155 | v->v_type = V_ERR; | |
156 | case V_ERR: | |
157 | flag = 0; | |
158 | break; | |
159 | } | |
160 | if (token != T_ANDAND) | |
161 | return 0; | |
162 | (void) s_gettok(); | |
163 | if (p_expr3_10(3, v, flag && true) < 0) | |
164 | return -1; | |
165 | } | |
166 | /*NOTREACHED*/ | |
167 | } |