projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| dc2a07ab | 1 | #ifndef lint |
| 60de5df9 | 2 | static char sccsid[] = "@(#)parser5.c 3.9 %G%"; |
| dc2a07ab EW |
3 | #endif |
| 4 | ||
| 60de5df9 EW |
5 | /* |
| 6 | * Copyright (c) 1983 Regents of the University of California, | |
| 7 | * All rights reserved. Redistribution permitted subject to | |
| 8 | * the terms of the Berkeley Software License Agreement. | |
| 9 | */ | |
| 10 | ||
| dc2a07ab | 11 | #include "parser.h" |
| 0173496c | 12 | #include "var.h" |
| dc2a07ab EW |
13 | |
| 14 | /* | |
| 5119bdf8 | 15 | * unary $ $? + - ! ~ |
| dc2a07ab EW |
16 | */ |
| 17 | p_expr11(v, flag) | |
| 18 | register struct value *v; | |
| 19 | char flag; | |
| 20 | { | |
| 21 | int op; | |
| 22 | char *opname; | |
| 23 | ||
| 24 | switch (token) { | |
| 25 | case T_DOLLAR: | |
| 26 | opname = "$"; | |
| 27 | break; | |
| 5119bdf8 EW |
28 | case T_DQ: |
| 29 | opname = "$?"; | |
| 30 | break; | |
| dc2a07ab EW |
31 | case T_PLUS: |
| 32 | opname = "unary +"; | |
| 33 | break; | |
| 34 | case T_MINUS: | |
| 35 | opname = "unary -"; | |
| 36 | break; | |
| 37 | case T_NOT: | |
| 38 | opname = "!"; | |
| 39 | break; | |
| 40 | case T_COMP: | |
| 41 | opname = "~"; | |
| 42 | break; | |
| 43 | default: | |
| 44 | return p_expr12(v, flag); | |
| 45 | } | |
| 46 | op = token; | |
| 47 | (void) s_gettok(); | |
| 48 | if (p_expr11(v, flag) < 0) | |
| 49 | return -1; | |
| 50 | switch (v->v_type) { | |
| 51 | case V_NUM: | |
| dc2a07ab EW |
52 | break; |
| 53 | case V_STR: | |
| 54 | switch (op) { | |
| 55 | case T_MINUS: | |
| 56 | case T_NOT: | |
| 57 | case T_COMP: | |
| 5119bdf8 | 58 | p_error("%s: Numeric operand required.", opname); |
| dc2a07ab EW |
59 | str_free(v->v_str); |
| 60 | v->v_type = V_ERR; | |
| 61 | return 0; | |
| 62 | } | |
| 63 | break; | |
| 64 | case V_ERR: | |
| 65 | return 0; | |
| 66 | } | |
| 67 | switch (op) { | |
| 5119bdf8 EW |
68 | case T_DOLLAR: |
| 69 | case T_DQ: | |
| bb4a0c0b | 70 | if (v->v_type == V_NUM) { |
| 5119bdf8 EW |
71 | int tmp = cx.x_type == X_BUF && cx.x_arg != 0 && |
| 72 | v->v_num > 0 && v->v_num <= cx.x_narg; | |
| 73 | if (op == T_DQ) | |
| 74 | v->v_num = tmp; | |
| 75 | else if (tmp) | |
| 76 | *v = cx.x_arg[v->v_num - 1]; | |
| 77 | else { | |
| bb4a0c0b EW |
78 | p_error("%d: No such argument.", v->v_num); |
| 79 | v->v_type = V_ERR; | |
| bb4a0c0b | 80 | } |
| bb4a0c0b | 81 | } else { |
| 5119bdf8 EW |
82 | char *name = v->v_str; |
| 83 | struct var *r = var_lookup(name); | |
| 84 | if (op == T_DQ) { | |
| 85 | v->v_type = V_NUM; | |
| 86 | v->v_num = r != 0; | |
| 87 | } else if (r != 0) | |
| 88 | *v = r->r_val; | |
| 89 | else { | |
| 90 | p_error("%s: Undefined variable.", name); | |
| bb4a0c0b | 91 | v->v_type = V_ERR; |
| bb4a0c0b | 92 | } |
| 5119bdf8 | 93 | str_free(name); |
| dc2a07ab | 94 | } |
| 5119bdf8 | 95 | if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) { |
| bb4a0c0b EW |
96 | p_memerror(); |
| 97 | return -1; | |
| dc2a07ab EW |
98 | } |
| 99 | break; | |
| dc2a07ab EW |
100 | case T_MINUS: |
| 101 | v->v_num = - v->v_num; | |
| 102 | break; | |
| 103 | case T_NOT: | |
| 104 | v->v_num = ! v->v_num; | |
| 105 | break; | |
| 106 | case T_COMP: | |
| 107 | v->v_num = ~ v->v_num; | |
| 108 | break; | |
| 109 | } | |
| 110 | return 0; | |
| 111 | } | |
| 112 | ||
| 113 | /* | |
| 114 | * string, number, ( expr ) | |
| 115 | * Plus function calls. | |
| dc2a07ab EW |
116 | * |
| 117 | * Always return v_type == V_ERR when flag == 0. | |
| 118 | */ | |
| 119 | p_expr12(v, flag) | |
| 120 | register struct value *v; | |
| 121 | char flag; | |
| 122 | { | |
| 123 | v->v_type = V_ERR; | |
| dc2a07ab | 124 | switch (token) { |
| dc2a07ab | 125 | case T_NUM: |
| dc2a07ab EW |
126 | if (flag) { |
| 127 | v->v_type = V_NUM; | |
| 128 | v->v_num = token_num; | |
| 129 | } | |
| 130 | (void) s_gettok(); | |
| 131 | break; | |
| 132 | case T_STR: | |
| dc2a07ab EW |
133 | if (flag) { |
| 134 | v->v_type = V_STR; | |
| 135 | v->v_str = token_str; | |
| 136 | } else | |
| 137 | str_free(token_str); | |
| 138 | (void) s_gettok(); | |
| 139 | break; | |
| 140 | case T_LP: | |
| 141 | (void) s_gettok(); | |
| 142 | if (p_expr(v, flag) < 0) { | |
| 143 | p_synerror(); | |
| 144 | return -1; | |
| 145 | } | |
| 146 | if (token != T_RP) { | |
| 147 | p_synerror(); | |
| 148 | val_free(*v); | |
| 149 | return -1; | |
| 150 | } | |
| 151 | (void) s_gettok(); | |
| 152 | break; | |
| 153 | default: | |
| dc2a07ab EW |
154 | return -1; |
| 155 | } | |
| 156 | while (token == T_LP) { | |
| 157 | char *cmd; | |
| 158 | ||
| bb4a0c0b EW |
159 | if (p_convstr(v) < 0) |
| 160 | return -1; | |
| 161 | cmd = v->v_type == V_STR ? v->v_str : 0; | |
| dc2a07ab | 162 | if (p_function(cmd, v, flag) < 0) { |
| f8e2d916 EW |
163 | if (cmd) |
| 164 | str_free(cmd); | |
| dc2a07ab EW |
165 | return -1; |
| 166 | } | |
| f8e2d916 EW |
167 | if (cmd) |
| 168 | str_free(cmd); | |
| dc2a07ab EW |
169 | } |
| 170 | return 0; | |
| 171 | } |