projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| dc2a07ab | 1 | #ifndef lint |
| 7edc52ec | 2 | static char sccsid[] = "@(#)parser5.c 3.6 %G%"; |
| dc2a07ab EW |
3 | #endif |
| 4 | ||
| 5 | #include "parser.h" | |
| 0173496c | 6 | #include "var.h" |
| dc2a07ab EW |
7 | |
| 8 | /* | |
| 9 | * unary $ + - ! ~ | |
| 10 | */ | |
| 11 | p_expr11(v, flag) | |
| 12 | register struct value *v; | |
| 13 | char flag; | |
| 14 | { | |
| 15 | int op; | |
| 16 | char *opname; | |
| 17 | ||
| 18 | switch (token) { | |
| 19 | case T_DOLLAR: | |
| 20 | opname = "$"; | |
| 21 | break; | |
| 22 | case T_PLUS: | |
| 23 | opname = "unary +"; | |
| 24 | break; | |
| 25 | case T_MINUS: | |
| 26 | opname = "unary -"; | |
| 27 | break; | |
| 28 | case T_NOT: | |
| 29 | opname = "!"; | |
| 30 | break; | |
| 31 | case T_COMP: | |
| 32 | opname = "~"; | |
| 33 | break; | |
| 34 | default: | |
| 35 | return p_expr12(v, flag); | |
| 36 | } | |
| 37 | op = token; | |
| 38 | (void) s_gettok(); | |
| 39 | if (p_expr11(v, flag) < 0) | |
| 40 | return -1; | |
| 41 | switch (v->v_type) { | |
| 42 | case V_NUM: | |
| dc2a07ab EW |
43 | break; |
| 44 | case V_STR: | |
| 45 | switch (op) { | |
| 46 | case T_MINUS: | |
| 47 | case T_NOT: | |
| 48 | case T_COMP: | |
| 49 | p_error("Numeric value required for %s.", opname); | |
| 50 | str_free(v->v_str); | |
| 51 | v->v_type = V_ERR; | |
| 52 | return 0; | |
| 53 | } | |
| 54 | break; | |
| 55 | case V_ERR: | |
| 56 | return 0; | |
| 57 | } | |
| 58 | switch (op) { | |
| 59 | case T_DOLLAR: { | |
| 60 | struct var *r; | |
| bb4a0c0b EW |
61 | if (v->v_type == V_NUM) { |
| 62 | v->v_num--; | |
| c352fd33 | 63 | if (cx.x_type != X_BUF || cx.x_arg == 0 || |
| bb4a0c0b EW |
64 | v->v_num < 0 || v->v_num >= cx.x_narg) { |
| 65 | p_error("%d: No such argument.", v->v_num); | |
| 66 | v->v_type = V_ERR; | |
| 67 | return 0; | |
| 68 | } | |
| 69 | if (flag) | |
| 70 | *v = cx.x_arg[v->v_num]; | |
| 71 | } else { | |
| 72 | if ((r = var_lookup(v->v_str)) == 0) { | |
| 73 | p_error("%s: Undefined variable.", v->v_str); | |
| 74 | str_free(v->v_str); | |
| 75 | v->v_type = V_ERR; | |
| 76 | return 0; | |
| 77 | } | |
| dc2a07ab | 78 | str_free(v->v_str); |
| bb4a0c0b EW |
79 | if (flag) |
| 80 | *v = r->r_val; | |
| dc2a07ab | 81 | } |
| bb4a0c0b EW |
82 | if (v->v_type == V_STR |
| 83 | && (v->v_str = str_cpy(v->v_str)) == 0) { | |
| 84 | p_memerror(); | |
| 85 | return -1; | |
| dc2a07ab EW |
86 | } |
| 87 | break; | |
| 88 | } | |
| 89 | case T_MINUS: | |
| 90 | v->v_num = - v->v_num; | |
| 91 | break; | |
| 92 | case T_NOT: | |
| 93 | v->v_num = ! v->v_num; | |
| 94 | break; | |
| 95 | case T_COMP: | |
| 96 | v->v_num = ~ v->v_num; | |
| 97 | break; | |
| 98 | } | |
| 99 | return 0; | |
| 100 | } | |
| 101 | ||
| 102 | /* | |
| 103 | * string, number, ( expr ) | |
| 104 | * Plus function calls. | |
| 105 | * Also we map % into string. | |
| 106 | * | |
| 107 | * Always return v_type == V_ERR when flag == 0. | |
| 108 | */ | |
| 109 | p_expr12(v, flag) | |
| 110 | register struct value *v; | |
| 111 | char flag; | |
| 112 | { | |
| 113 | v->v_type = V_ERR; | |
| dc2a07ab EW |
114 | switch (token) { |
| 115 | case T_MOD: | |
| dc2a07ab EW |
116 | if (flag) { |
| 117 | v->v_type = V_STR; | |
| 118 | v->v_str = str_cpy("%"); | |
| 119 | } | |
| 120 | (void) s_gettok(); | |
| 121 | break; | |
| 122 | case T_NUM: | |
| dc2a07ab EW |
123 | if (flag) { |
| 124 | v->v_type = V_NUM; | |
| 125 | v->v_num = token_num; | |
| 126 | } | |
| 127 | (void) s_gettok(); | |
| 128 | break; | |
| 129 | case T_STR: | |
| dc2a07ab EW |
130 | if (flag) { |
| 131 | v->v_type = V_STR; | |
| 132 | v->v_str = token_str; | |
| 133 | } else | |
| 134 | str_free(token_str); | |
| 135 | (void) s_gettok(); | |
| 136 | break; | |
| 137 | case T_LP: | |
| 138 | (void) s_gettok(); | |
| 139 | if (p_expr(v, flag) < 0) { | |
| 140 | p_synerror(); | |
| 141 | return -1; | |
| 142 | } | |
| 143 | if (token != T_RP) { | |
| 144 | p_synerror(); | |
| 145 | val_free(*v); | |
| 146 | return -1; | |
| 147 | } | |
| 148 | (void) s_gettok(); | |
| 149 | break; | |
| 150 | default: | |
| dc2a07ab EW |
151 | return -1; |
| 152 | } | |
| 153 | while (token == T_LP) { | |
| 154 | char *cmd; | |
| 155 | ||
| 156 | (void) s_gettok(); | |
| bb4a0c0b EW |
157 | if (p_convstr(v) < 0) |
| 158 | return -1; | |
| 159 | cmd = v->v_type == V_STR ? v->v_str : 0; | |
| dc2a07ab | 160 | if (p_function(cmd, v, flag) < 0) { |
| f8e2d916 EW |
161 | if (cmd) |
| 162 | str_free(cmd); | |
| dc2a07ab EW |
163 | return -1; |
| 164 | } | |
| f8e2d916 EW |
165 | if (cmd) |
| 166 | str_free(cmd); | |
| dc2a07ab EW |
167 | if (token != T_RP) { |
| 168 | p_synerror(); | |
| 169 | val_free(*v); | |
| 170 | return -1; | |
| 171 | } | |
| 172 | (void) s_gettok(); | |
| 173 | } | |
| 174 | return 0; | |
| 175 | } |