[9] | 1 | /*
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| 2 | * a small awk clone
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| 3 | *
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| 4 | * (C) 1989 Saeko Hirabauashi & Kouichi Hirabayashi
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| 5 | *
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| 6 | * Absolutely no warranty. Use this software with your own risk.
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| 7 | *
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| 8 | * Permission to use, copy, modify and distribute this software for any
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| 9 | * purpose and without fee is hereby granted, provided that the above
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| 10 | * copyright and disclaimer notice.
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| 11 | *
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| 12 | * This program was written to fit into 64K+64K memory of the Minix 1.2.
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| 13 | */
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| 14 |
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include "awk.h"
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| 18 |
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| 19 | extern char *mkpat();
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| 20 |
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| 21 | extern char *cmd;
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| 22 | extern char text[];
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| 23 | extern char funnam[];
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| 24 | extern int sym;
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| 25 | extern int sym1;
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| 26 | extern int regexflg;
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| 27 | extern int funflg;
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| 28 | extern int printflg;
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| 29 | extern int getlineflg;
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| 30 |
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| 31 | extern SYMBOL *hashtab[], *funtab[];
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| 32 |
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| 33 | extern CELL *field[];
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| 34 |
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| 35 | char *emalloc(), *strsave();
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| 36 | NODE *node0(), *node1(), *node2(), *node3(), *node4();
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| 37 | NODE *stat(), *pastat();
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| 38 | NODE *expr(), *expr1(), *expr2(), *expr3(), *expr4();
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| 39 | NODE *expr5(), *expr6(), *expr7(), *expr8(), *expr9(), *expr10();
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| 40 | NODE *doprint(), *dofuncn(), *doif(), *dowhile(), *dofor(), *body();
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| 41 | NODE *doassign(), *dodo(), *doarray(), *doreturn(), *doelement();
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| 42 | CELL *mkcell(), *getvar();
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| 43 | CELL *execute(), *lookup();
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| 44 |
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| 45 | int forflg; /* parsing for(expr in array), inhibit 'expr in array' */
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| 46 | int prmflg; /* parsing pass parameters */
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| 47 | NODE *begin, *loop, *End;
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| 48 |
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| 49 | parse()
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| 50 | {
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| 51 | NODE *p, *q, *r, *stat();
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| 52 | CELL *u;
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| 53 |
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| 54 | lex();
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| 55 | skipeol();
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| 56 | while (sym) {
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| 57 | switch (sym) {
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| 58 | case BEGIN:
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| 59 | lex();
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| 60 | begin = stat();
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| 61 | break;
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| 62 | case END:
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| 63 | lex();
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| 64 | if (End == NULL)
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| 65 | End = stat();
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| 66 | else {
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| 67 | for (p = End; p; p = q) {
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| 68 | if ((q = p->n_next) == NULL)
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| 69 | p->n_next = stat();
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| 70 | }
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| 71 | }
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| 72 | break;
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| 73 | case FUNC:
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| 74 | lex();
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| 75 | dousrfun();
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| 76 | break;
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| 77 | default:
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| 78 | q = loop = pastat();
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| 79 | skipeol();
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| 80 | while (sym && sym != BEGIN && sym != END && sym != FUNC) {
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| 81 | r = pastat();
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| 82 | q->n_next = r;
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| 83 | q = r;
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| 84 | skipeol();
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| 85 | }
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| 86 | break;
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| 87 | }
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| 88 | skipeol();
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| 89 | }
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| 90 | if (begin) {
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| 91 | u = execute(begin);
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| 92 | c_free(u);
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| 93 | }
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| 94 | if (End || loop)
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| 95 | while (Getrec(NULL)) {
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| 96 | if (loop) {
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| 97 | u = execute(loop);
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| 98 | c_free(u);
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| 99 | }
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| 100 | }
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| 101 | if (End) {
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| 102 | u = execute(End);
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| 103 | c_free(u);
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| 104 | }
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| 105 | }
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| 106 |
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| 107 | #define MAXARG 100
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| 108 | static char *argnam[MAXARG];
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| 109 | static int narg;
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| 110 |
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| 111 | static
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| 112 | dousrfun()
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| 113 | {
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| 114 | CELL *u;
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| 115 |
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| 116 | strcpy(funnam, text);
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| 117 | u = getvar(text, funtab, FUN);
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| 118 | lex();
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| 119 | if (sym != '(')
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| 120 | synerr("'(' expected");
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| 121 | for (lex(); sym != ')'; narg++) {
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| 122 | if (sym != IDENT)
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| 123 | synerr("argument expected");
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| 124 | argnam[narg] = strsave(text);
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| 125 | lex();
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| 126 | if (sym == ',')
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| 127 | lex();
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| 128 | }
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| 129 | u->c_fval = (double) narg;
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| 130 | lex();
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| 131 | skipeol();
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| 132 | funflg++;
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| 133 | u->c_sval = (char *) stat();
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| 134 | funflg--;
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| 135 | if (narg > 0) {
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| 136 | do {
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| 137 | sfree(argnam[--narg]);
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| 138 | } while (narg > 0);
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| 139 | }
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| 140 | skipeol();
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| 141 | }
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| 142 |
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| 143 | isarg(s) char *s;
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| 144 | {
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| 145 | int i;
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| 146 |
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| 147 | if (narg > 0) {
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| 148 | for (i = narg - 1; i >= 0; i--)
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| 149 | if (strcmp(s, argnam[i]) == 0)
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| 150 | break;
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| 151 | }
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| 152 | else
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| 153 | i = -1;
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| 154 | return i;
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| 155 | }
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| 156 |
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| 157 | /*
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| 158 | interactive()
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| 159 | {
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| 160 | NODE *p, *q;
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| 161 | CELL *u;
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| 162 |
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| 163 | for (lex(); sym; lex()) {
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| 164 | p = stat();
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| 165 | if (p->n_type != PRINT && !iscntl(p->n_type)) {
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| 166 | q = (NODE *) emalloc(sizeof(NODE) + sizeof(NODE *) * 4);
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| 167 | q->n_type = PRINT;
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| 168 | q->n_arg[0] = q->n_arg[1] = q->n_arg[3] = NULL;
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| 169 | q->n_arg[2] = p;
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| 170 | q->n_next = NULL;
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| 171 | p = q;
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| 172 | }
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| 173 | u = execute(p);
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| 174 | printf("[%g(%s)]\n", u->c_fval, u->c_sval);
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| 175 | c_free(u);
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| 176 | }
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| 177 | closeall();
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| 178 | exit(0);
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| 179 | }
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| 180 | */
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| 181 |
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| 182 | static
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| 183 | iscntl(t)
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| 184 | {
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| 185 | static int tab[] = {
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| 186 | IF, DO, WHILE, FOR, JUMP, GETLINE, 0
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| 187 | };
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| 188 | int i;
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| 189 |
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| 190 | for (i = 0; tab[i]; i++)
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| 191 | if (t == tab[i])
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| 192 | break;
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| 193 | return tab[i];
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| 194 | }
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| 195 |
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| 196 | static NODE *
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| 197 | pastat()
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| 198 | {
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| 199 | NODE *p, *q, *r;
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| 200 |
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| 201 | if (sym == '{') /* action only */
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| 202 | p = stat();
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| 203 | else { /* exp [, expr] [{ .. }] */
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| 204 | p = expr();
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| 205 | if (sym == ',') {
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| 206 | lex();
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| 207 | q = expr();
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| 208 | }
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| 209 | else
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| 210 | q = NULL;
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| 211 | if (sym && sym != EOL)
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| 212 | r = stat();
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| 213 | else
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| 214 | r = node0(PRINT0);
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| 215 | if (q)
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| 216 | p = node3(P2STAT, p, q, r);
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| 217 | else
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| 218 | p = node2(P1STAT, p, r);
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| 219 | }
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| 220 | return p;
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| 221 | }
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| 222 |
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| 223 | static NODE *
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| 224 | stat()
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| 225 | {
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| 226 | NODE *p, *q, *r;
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| 227 | CELL *u, *v;
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| 228 | int op;
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| 229 |
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| 230 | /*printf("@stat(%d)(%s)\n", sym, text);*/
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| 231 | while (sym == EOL)
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| 232 | lex();
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| 233 | switch(sym) {
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| 234 | case PRINT:
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| 235 | p = doprint(0);
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| 236 | break;
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| 237 | case PRINTF:
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| 238 | p = doprint(FORMAT);
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| 239 | break;
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| 240 | case IF:
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| 241 | p = doif();
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| 242 | break;
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| 243 | case WHILE:
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| 244 | p = dowhile();
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| 245 | break;
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| 246 | case DO:
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| 247 | p = dodo();
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| 248 | break;
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| 249 | case FOR:
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| 250 | p = dofor();
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| 251 | break;
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| 252 | case RETURN:
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| 253 | p = doreturn();
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| 254 | break;
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| 255 | case EXIT:
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| 256 | p = node2(JUMP, (NODE *)sym, (NODE *)NULL);
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| 257 | lex();
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| 258 | if (sym == IDENT || sym == NUMBER || sym == ARG)
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| 259 | p->n_arg[1] = expr();
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| 260 | break;
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| 261 | case BREAK: case CONTIN: case NEXT:
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| 262 | p = node1(JUMP, (NODE *)sym);
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| 263 | lex();
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| 264 | break;
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| 265 | case DELETE:
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| 266 | lex();
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| 267 | u = getvar(text, hashtab, ARR);
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| 268 | if (Getc() != '[')
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| 269 | synerr("'[' expected");
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| 270 | p = doarray(u);
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| 271 | p->n_type = DELETE;
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| 272 | lex(); /* ']' */
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| 273 | break;
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| 274 | case '{':
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| 275 | lex();
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| 276 | skipeol();
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| 277 | if (sym == '}')
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| 278 | p = node0(NULPROC);
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| 279 | else
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| 280 | p = q = stat();
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| 281 | skipeol();
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| 282 | while (sym != '}') {
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| 283 | r = stat();
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| 284 | q->n_next = r;
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| 285 | q = r;
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| 286 | skipeol();
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| 287 | }
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| 288 | lex();
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| 289 | break;
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| 290 | default:
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| 291 | p = expr();
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| 292 | #if 0
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| 293 | if (sym == BINOR) { /* expr | GETLINE */
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| 294 | lex();
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| 295 | if (sym != GETLINE)
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| 296 | synerr("'GETLINE' expected");
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| 297 | lex();
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| 298 | if (sym == IDENT || sym == STRING || sym == ARG) {
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| 299 | q = expr();
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| 300 | }
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| 301 | else
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| 302 | q = NULL;
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| 303 | p = node3(GETLINE, q, p, (NODE *)R_PIN);
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| 304 | }
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| 305 | #endif
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| 306 | break;
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| 307 | }
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| 308 | if (p->n_type == VALUE)
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| 309 | synerr("statement expected");
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| 310 | return p;
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| 311 | }
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| 312 |
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| 313 | static
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| 314 | skipeol()
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| 315 | {
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| 316 | while (sym == EOL)
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| 317 | lex();
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| 318 | }
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| 319 |
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| 320 | static NODE *
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| 321 | doprint(fmt)
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| 322 | {
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| 323 | NODE *p, *q, *r;
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| 324 | CELL *u;
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| 325 | int i, op;
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| 326 | int n = 0;
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| 327 |
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| 328 | printflg++;
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| 329 | lex();
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| 330 | if (sym == '(')
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| 331 | lex();
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| 332 | if (sym != '}' && sym != ')' && sym != EOL && sym != R_OUT && sym != R_APD
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| 333 | && sym != R_POUT) {
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| 334 | p = q = expr(); n++;
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| 335 | while (sym == ',') {
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| 336 | lex();
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| 337 | skipeol();
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| 338 | r = expr(); n++;
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| 339 | q->n_next = r;
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| 340 | q = r;
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| 341 | }
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| 342 | }
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| 343 | if (sym == ')')
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| 344 | lex();
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| 345 | if (sym == R_OUT || sym == R_APD || sym == R_POUT) {
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| 346 | op = sym;
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| 347 | lex();
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| 348 | /* q = expr10();*/
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| 349 | q = expr(); /* 94-04-02 */
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| 350 | }
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| 351 | else
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| 352 | q = (NODE *) (op = 0); /* stdout */
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| 353 | printflg = 0;
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| 354 | r = (NODE *) emalloc(sizeof(*r) + sizeof(r) * (n + 3));
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| 355 | r->n_type = PRINT; /* convert list to arg */
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| 356 | r->n_next = NULL;
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| 357 | r->n_arg[0] = (NODE *) (op | fmt);
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| 358 | r->n_arg[1] = q;
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| 359 | if (n == 0) {
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| 360 | p = node1(VALUE, (NODE *)field[0]);
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| 361 | }
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| 362 | for (i = 2; p != NULL; i++) {
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| 363 | r->n_arg[i] = p;
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| 364 | q = p->n_next;
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| 365 | p->n_next = NULL;
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| 366 | p = q;
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| 367 | }
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| 368 | r->n_arg[i] = NULL;
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| 369 | return r;
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| 370 | }
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| 371 |
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| 372 | static NODE *
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| 373 | doif()
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| 374 | {
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| 375 | NODE *p, *q, *r;
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| 376 |
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| 377 | lex();
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| 378 | if (sym != '(')
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| 379 | synerr("'(' expected");
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| 380 | lex();
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| 381 | p = expr();
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| 382 | if (sym != ')')
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| 383 | synerr("')' expected");
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| 384 | lex();
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| 385 | skipeol();
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| 386 | q = stat();
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| 387 | skipeol();
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| 388 | if (sym == ELSE) {
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| 389 | lex();
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| 390 | skipeol();
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| 391 | r = stat();
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| 392 | }
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| 393 | else
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| 394 | r = NULL;
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| 395 | return node3(IF, p, q, r);
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| 396 | }
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| 397 |
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| 398 | static NODE *
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| 399 | dowhile()
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| 400 | {
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| 401 | NODE *p, *q;
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| 402 |
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| 403 | lex();
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| 404 | if (sym != '(')
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| 405 | synerr("'(' expected");
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| 406 | lex();
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| 407 | p = stat();
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| 408 | if (sym != ')')
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| 409 | synerr("')' expected");
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| 410 | q = body();
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| 411 | return node2(WHILE, p, q);
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| 412 | }
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| 413 |
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| 414 | static NODE *
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| 415 | dofor()
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| 416 | {
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| 417 | NODE *p, *q, *r, *s;
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| 418 | CELL *u;
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| 419 | int i;
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| 420 |
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| 421 | lex();
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| 422 | if (sym != '(')
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| 423 | synerr("'(' expected");
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| 424 | lex();
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| 425 | if (sym != EOL) {
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| 426 | forflg++; /* inhibit parsing 'expr IN array' */
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| 427 | p = expr();
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| 428 | forflg = 0;
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| 429 | }
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| 430 | else
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| 431 | p = NULL;
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| 432 | if (sym == IN) {
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| 433 | lex();
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| 434 | if (sym == ARG) {
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| 435 | /*
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| 436 | printf("***FOR_IN_ARG(%d)***\n", sym);
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| 437 | */
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| 438 | u = mkcell(POS, NULL, (double)sym1);
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| 439 | q = node1(ARG, u);
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| 440 | }
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| 441 | else {
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| 442 | u = getvar(text, hashtab, ARR);
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| 443 | q = node1(VALUE, u);
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| 444 | }
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| 445 | lex();
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| 446 | if (sym != ')')
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| 447 | synerr("')' expected");
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| 448 | lex();
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| 449 | skipeol();
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| 450 | s = stat();
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| 451 | r = node3(FORIN, p, q, s);
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| 452 | }
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| 453 | else {
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| 454 | if (sym != EOL)
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| 455 | synerr("'in' or ';' expected");
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| 456 | lex();
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| 457 | if (sym != EOL)
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| 458 | q = expr();
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| 459 | else
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| 460 | q = NULL;
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| 461 | if (sym != EOL)
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| 462 | synerr("';' expected");
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| 463 | lex();
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| 464 | if (sym != ')')
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| 465 | r = expr();
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| 466 | else
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| 467 | r = NULL;
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| 468 | if (sym != ')')
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| 469 | synerr("')' expected");
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| 470 | s = body();
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| 471 | r = node4(FOR, p, q, r, s);
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| 472 | }
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| 473 | return r;
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| 474 | }
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| 475 |
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| 476 | static NODE *
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| 477 | body()
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| 478 | {
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| 479 | NODE *r;
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| 480 |
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| 481 | while ((sym = Getc()) == '\n' || sym == ' ' || sym == '\t')
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| 482 | ;
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| 483 | if (sym == ';') {
|
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| 484 | r = node0(NULPROC);
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| 485 | lex();
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| 486 | }
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| 487 | else {
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| 488 | Ungetc(sym);
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| 489 | lex();
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| 490 | r = stat();
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| 491 | }
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| 492 | return r;
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| 493 | }
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| 494 |
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| 495 | static NODE *
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| 496 | dodo()
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| 497 | {
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| 498 | NODE *p, *q;
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| 499 |
|
---|
| 500 | lex();
|
---|
| 501 | skipeol();
|
---|
| 502 | p = stat();
|
---|
| 503 | skipeol();
|
---|
| 504 | if (sym != WHILE)
|
---|
| 505 | synerr("'while' expected");
|
---|
| 506 | lex();
|
---|
| 507 | if (sym != '(')
|
---|
| 508 | synerr("'(' expected");
|
---|
| 509 | lex();
|
---|
| 510 | q = stat();
|
---|
| 511 | if (sym != ')')
|
---|
| 512 | synerr("')' expected");
|
---|
| 513 | lex();
|
---|
| 514 | return node2(DO, p, q);
|
---|
| 515 | }
|
---|
| 516 |
|
---|
| 517 | static NODE *
|
---|
| 518 | doreturn()
|
---|
| 519 | {
|
---|
| 520 | NODE *p, *q, *r;
|
---|
| 521 | int i, n = 0;
|
---|
| 522 |
|
---|
| 523 | if (lex() != EOL) {
|
---|
| 524 | p = q = expr(); n++;
|
---|
| 525 | while (sym == ',') {
|
---|
| 526 | lex(); skipeol();
|
---|
| 527 | r = expr(); n++;
|
---|
| 528 | q ->n_next = r;
|
---|
| 529 | q = r;
|
---|
| 530 | }
|
---|
| 531 | }
|
---|
| 532 | else
|
---|
| 533 | p = (NODE *)NULL;
|
---|
| 534 |
|
---|
| 535 | r = (NODE *) emalloc(sizeof(*r) + sizeof (r) * (n + 1));
|
---|
| 536 | r->n_type = JUMP;
|
---|
| 537 | r->n_next = NULL;
|
---|
| 538 | r->n_arg[0] = (NODE *) RETURN;
|
---|
| 539 | for (i = 1; p != NULL; i++) {
|
---|
| 540 | r->n_arg[i] = p;
|
---|
| 541 | q = p->n_next;
|
---|
| 542 | p->n_next = NULL;
|
---|
| 543 | p = q;
|
---|
| 544 | }
|
---|
| 545 | r->n_arg[i] = NULL;
|
---|
| 546 | return r;
|
---|
| 547 | }
|
---|
| 548 |
|
---|
| 549 | static NODE *
|
---|
| 550 | expr()
|
---|
| 551 | {
|
---|
| 552 | NODE *p;
|
---|
| 553 |
|
---|
| 554 | p = expr1();
|
---|
| 555 | if (isassign(sym))
|
---|
| 556 | p = doassign(sym, p);
|
---|
| 557 | return p;
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | static isassign(sym)
|
---|
| 561 | {
|
---|
| 562 | return (sym == ASSIGN || sym == ADDEQ || sym == SUBEQ || sym == MULTEQ
|
---|
| 563 | || sym == DIVEQ || sym == MODEQ || sym == POWEQ);
|
---|
| 564 | }
|
---|
| 565 |
|
---|
| 566 | static NODE *
|
---|
| 567 | doassign(op, p) NODE *p;
|
---|
| 568 | { /* evaluate right to left */
|
---|
| 569 | NODE *q;
|
---|
| 570 |
|
---|
| 571 | lex();
|
---|
| 572 | q = expr();
|
---|
| 573 | if (isassign(sym))
|
---|
| 574 | q = doassign(sym, q);
|
---|
| 575 | return node3(ASSIGN, (NODE *)op, p, q);
|
---|
| 576 | }
|
---|
| 577 |
|
---|
| 578 | static NODE *
|
---|
| 579 | expr1()
|
---|
| 580 | {
|
---|
| 581 | NODE *p, *q;
|
---|
| 582 |
|
---|
| 583 | /*
|
---|
| 584 | printf("expr1(%d)(%s)\n", sym, text);
|
---|
| 585 | */
|
---|
| 586 | p = expr2();
|
---|
| 587 | if (sym == '?') {
|
---|
| 588 | lex();
|
---|
| 589 | #if 0
|
---|
| 590 | q = stat();
|
---|
| 591 | if (sym != ':')
|
---|
| 592 | synerr("':' expected");
|
---|
| 593 | lex();
|
---|
| 594 | return node3(IF, p, q, stat());
|
---|
| 595 | #else
|
---|
| 596 | q = expr();
|
---|
| 597 | if (sym != ':')
|
---|
| 598 | synerr("':' expected");
|
---|
| 599 | lex();
|
---|
| 600 | return node3(IF, p, q, expr());
|
---|
| 601 | #endif
|
---|
| 602 | }
|
---|
| 603 | return p; /* 930213 */
|
---|
| 604 | }
|
---|
| 605 |
|
---|
| 606 | static NODE *
|
---|
| 607 | expr2()
|
---|
| 608 | {
|
---|
| 609 | NODE *p;
|
---|
| 610 |
|
---|
| 611 | /*
|
---|
| 612 | printf("expr2(%d)(%s)\n", sym, text);
|
---|
| 613 | */
|
---|
| 614 | p = expr3();
|
---|
| 615 | while (sym == OR) {
|
---|
| 616 | lex();
|
---|
| 617 | skipeol();
|
---|
| 618 | p = node3(COND, (NODE *)OR, p, expr3());
|
---|
| 619 | }
|
---|
| 620 | return p;
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | static NODE *
|
---|
| 624 | expr3()
|
---|
| 625 | {
|
---|
| 626 | NODE *p;
|
---|
| 627 |
|
---|
| 628 | /*
|
---|
| 629 | printf("expr3(%d)(%s)\n", sym, text);
|
---|
| 630 | */
|
---|
| 631 | p = expr4();
|
---|
| 632 | while (sym == AND) {
|
---|
| 633 | lex();
|
---|
| 634 | skipeol();
|
---|
| 635 | p = node3(COND, (NODE *)AND, p, expr4());
|
---|
| 636 | }
|
---|
| 637 | return p;
|
---|
| 638 | }
|
---|
| 639 |
|
---|
| 640 | static NODE *
|
---|
| 641 | expr4()
|
---|
| 642 | {
|
---|
| 643 | NODE *p;
|
---|
| 644 | CELL *q;
|
---|
| 645 | int op;
|
---|
| 646 |
|
---|
| 647 | /*
|
---|
| 648 | printf("expr4(%d)(%s)\n", sym, text);
|
---|
| 649 | */
|
---|
| 650 | p = expr5();
|
---|
| 651 | if (!forflg && sym == IN) {
|
---|
| 652 | lex();
|
---|
| 653 | q = getvar(text, hashtab, ARR);
|
---|
| 654 | lex();
|
---|
| 655 | return node2(IN, p, q);
|
---|
| 656 | }
|
---|
| 657 | while (sym == EQ || sym == NE || sym == LT || sym == LE || sym == GT
|
---|
| 658 | || sym == GE || sym == MATCH || sym == NOMATCH) {
|
---|
| 659 | op = sym;
|
---|
| 660 | lex();
|
---|
| 661 | p = node3(COND, (NODE *)op, p, expr5());
|
---|
| 662 | }
|
---|
| 663 | return p;
|
---|
| 664 | }
|
---|
| 665 |
|
---|
| 666 | static NODE *
|
---|
| 667 | expr5()
|
---|
| 668 | {
|
---|
| 669 | NODE *p, *q;
|
---|
| 670 |
|
---|
| 671 | /*
|
---|
| 672 | printf("expr5(%d)(%s)\n", sym, text);
|
---|
| 673 | */
|
---|
| 674 | p = expr6();
|
---|
| 675 | while (iscat(sym)) {
|
---|
| 676 | q = expr6();
|
---|
| 677 | p = node2(CAT, p, q);
|
---|
| 678 | }
|
---|
| 679 | return p;
|
---|
| 680 | }
|
---|
| 681 |
|
---|
| 682 | static iscat(sym)
|
---|
| 683 | {
|
---|
| 684 | static int ctab[] = {
|
---|
| 685 | ADD, SUB, MULT, DIV, MOD, INC, DEC, STRING, NUMBER, IDENT, '(',
|
---|
| 686 | MATHFUN, STRFUN, SPRINTF, '$', SUBST, ARG, CALL, 0
|
---|
| 687 | };
|
---|
| 688 | register int i, j;
|
---|
| 689 |
|
---|
| 690 | for (i = 0; j = ctab[i]; i++)
|
---|
| 691 | if (sym == j)
|
---|
| 692 | break;
|
---|
| 693 | return j;
|
---|
| 694 | }
|
---|
| 695 |
|
---|
| 696 | static NODE *
|
---|
| 697 | expr6()
|
---|
| 698 | {
|
---|
| 699 | register int sign = sym;
|
---|
| 700 | NODE *p, *q;
|
---|
| 701 |
|
---|
| 702 | /*
|
---|
| 703 | printf("expr6(%d)(%s)\n", sym, text);
|
---|
| 704 | */
|
---|
| 705 | if (sym == SUB || sym == ADD)
|
---|
| 706 | lex();
|
---|
| 707 | p = expr7();
|
---|
| 708 | if (sign == SUB)
|
---|
| 709 | p = node2(ARITH, (NODE *)UMINUS, p);
|
---|
| 710 | while (sym == ADD || sym == SUB) {
|
---|
| 711 | sign = sym;
|
---|
| 712 | lex();
|
---|
| 713 | q = expr7();
|
---|
| 714 | if (sign == ADD) {
|
---|
| 715 | p = node3(ARITH, (NODE *)ADD, p, q);
|
---|
| 716 | }
|
---|
| 717 | else if (sign == SUB) {
|
---|
| 718 | p = node3(ARITH, (NODE *)SUB, p, q);
|
---|
| 719 | }
|
---|
| 720 | else
|
---|
| 721 | synerr("'+' or '-' expected");
|
---|
| 722 | }
|
---|
| 723 | return p;
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | static NODE *
|
---|
| 727 | expr7()
|
---|
| 728 | {
|
---|
| 729 | register int op;
|
---|
| 730 | NODE *p, *q;
|
---|
| 731 |
|
---|
| 732 | /*
|
---|
| 733 | printf("expr7(%d)(%s)\n", sym, text);
|
---|
| 734 | */
|
---|
| 735 | p = expr8();
|
---|
| 736 | while (sym == MULT || sym == DIV || sym == MOD) {
|
---|
| 737 | op = sym;
|
---|
| 738 | lex();
|
---|
| 739 | q = expr8();
|
---|
| 740 | switch (op) {
|
---|
| 741 | case MULT: p = node3(ARITH, (NODE *)MULT, p, q); break;
|
---|
| 742 | case DIV: p = node3(ARITH, (NODE *)DIV, p, q); break;
|
---|
| 743 | case MOD: p = node3(ARITH, (NODE *)MOD, p, q); break;
|
---|
| 744 | default: synerr("'*', '/' or '%' expected"); break;
|
---|
| 745 | }
|
---|
| 746 | }
|
---|
| 747 | return p;
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 | static NODE *
|
---|
| 751 | expr8()
|
---|
| 752 | {
|
---|
| 753 | NODE *p;
|
---|
| 754 | int op;
|
---|
| 755 |
|
---|
| 756 | /*
|
---|
| 757 | printf("expr8(%d)(%s)\n", sym, text);
|
---|
| 758 | */
|
---|
| 759 | if (sym == NOT) {
|
---|
| 760 | lex();
|
---|
| 761 | p = node2(COND, (NODE *)NOT, expr9());
|
---|
| 762 | }
|
---|
| 763 | else {
|
---|
| 764 | p = expr9();
|
---|
| 765 | if (sym == POWER) {
|
---|
| 766 | lex();
|
---|
| 767 | p = node3(ARITH, (NODE *)POWER, p, expr9());
|
---|
| 768 | }
|
---|
| 769 | }
|
---|
| 770 | return p;
|
---|
| 771 | }
|
---|
| 772 |
|
---|
| 773 | static NODE *
|
---|
| 774 | expr9()
|
---|
| 775 | {
|
---|
| 776 | NODE *p, *q;
|
---|
| 777 | int op, sym0;
|
---|
| 778 |
|
---|
| 779 | /*
|
---|
| 780 | printf("expr9(%d)(%s)\n", sym, text);
|
---|
| 781 | */
|
---|
| 782 | if (op = isincdec(sym)) {
|
---|
| 783 | lex();
|
---|
| 784 | if (sym != IDENT && sym != ARG)
|
---|
| 785 | synerr("illegal '++/--' operator");
|
---|
| 786 | p = expr10();
|
---|
| 787 | p = node4(ARITH, (NODE *)INCDEC, p, (NODE *)op, (NODE *)PRE);
|
---|
| 788 | }
|
---|
| 789 | else {
|
---|
| 790 | sym0 = sym;
|
---|
| 791 | p = expr10();
|
---|
| 792 | if (op = isincdec(sym)) {
|
---|
| 793 | /*printf("POST(%d)(%d)(%s)\n", sym, sym0, text);*/
|
---|
| 794 | if (sym0 == IDENT || sym0 == ARG) {
|
---|
| 795 | p = node4(ARITH, (NODE *)INCDEC, p, (NODE *)op,
|
---|
| 796 | (NODE *)POST);
|
---|
| 797 | lex();
|
---|
| 798 | }
|
---|
| 799 | }
|
---|
| 800 | if (sym == BINOR) { /* | getline */
|
---|
| 801 | lex();
|
---|
| 802 | if (sym != GETLINE)
|
---|
| 803 | synerr("'GETLINE' expected");
|
---|
| 804 | lex();
|
---|
| 805 | if (sym == IDENT || sym == STRING || sym == ARG) {
|
---|
| 806 | q = expr();
|
---|
| 807 | }
|
---|
| 808 | else
|
---|
| 809 | q = NULL;
|
---|
| 810 | p = node3(GETLINE, q, p, (NODE *)R_PIN);
|
---|
| 811 | }
|
---|
| 812 | }
|
---|
| 813 | return p;
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | static isincdec(sym)
|
---|
| 817 | {
|
---|
| 818 | return sym == INC ? 1 : (sym == DEC ? -1 : 0);
|
---|
| 819 | }
|
---|
| 820 |
|
---|
| 821 | static NODE *
|
---|
| 822 | expr10()
|
---|
| 823 | {
|
---|
| 824 | NODE *p, *q;
|
---|
| 825 | CELL *u, *v;
|
---|
| 826 | int op;
|
---|
| 827 | int c;
|
---|
| 828 | int gsave, psave;
|
---|
| 829 | double atof();
|
---|
| 830 |
|
---|
| 831 | /*
|
---|
| 832 | printf("expr10(%d)(%s)\n", sym, text);
|
---|
| 833 | */
|
---|
| 834 | switch (sym) {
|
---|
| 835 | case STRING:
|
---|
| 836 | u = mkcell(STR, text, 0.0);
|
---|
| 837 | goto g1;
|
---|
| 838 | case NUMBER:
|
---|
| 839 | u = mkcell(NUM, NULL, atof(text));
|
---|
| 840 | g1:
|
---|
| 841 | p = node1(VALUE, u);
|
---|
| 842 | lex();
|
---|
| 843 | break;
|
---|
| 844 | case IDENT: case ARG:
|
---|
| 845 | if ((c = Getc()) == '[') { /* array */
|
---|
| 846 | /* 940403 */
|
---|
| 847 | if (sym == ARG) {
|
---|
| 848 | u = (CELL *)emalloc(sizeof(CELL));
|
---|
| 849 | u = mkcell(POS, NULL, (double)sym1);
|
---|
| 850 | p = doarray(u);
|
---|
| 851 | }
|
---|
| 852 | else {
|
---|
| 853 | u = getvar(text, hashtab, ARR);
|
---|
| 854 | p = doarray(u);
|
---|
| 855 | }
|
---|
| 856 | }
|
---|
| 857 | else {
|
---|
| 858 | Ungetc(c);
|
---|
| 859 | if (sym == ARG) {
|
---|
| 860 | u = mkcell(POS, NULL, (double)sym1);
|
---|
| 861 | p = node1(ARG, u);
|
---|
| 862 | }
|
---|
| 863 | else { /* symple variable */
|
---|
| 864 | u = getvar(text, hashtab, VAR|STR|NUM);
|
---|
| 865 | p = node1(VALUE, u);
|
---|
| 866 | }
|
---|
| 867 | }
|
---|
| 868 | lex();
|
---|
| 869 | break;
|
---|
| 870 | case '(':
|
---|
| 871 | /* print >(x ? y : z) needs this */
|
---|
| 872 | gsave = getlineflg; psave = printflg;
|
---|
| 873 | getlineflg = printflg = 0;
|
---|
| 874 | lex();
|
---|
| 875 | p = expr();
|
---|
| 876 | if (sym == ',') /* (expr, expr, .. ) */
|
---|
| 877 | p = doelement(p);
|
---|
| 878 | if (sym != ')')
|
---|
| 879 | synerr("')' expected");
|
---|
| 880 | getlineflg = gsave; printflg = psave;
|
---|
| 881 | lex();
|
---|
| 882 | break;
|
---|
| 883 | case CALL:
|
---|
| 884 | p = dofuncn(sym, getvar(text, funtab, UDF));
|
---|
| 885 | break;
|
---|
| 886 | case MATHFUN: case STRFUN: case SUBST:
|
---|
| 887 | p = dofuncn(sym, (CELL *)sym1);
|
---|
| 888 | break;
|
---|
| 889 | case SPRINTF:
|
---|
| 890 | p = doprint(FORMAT|STROUT);
|
---|
| 891 | break;
|
---|
| 892 | case '$':
|
---|
| 893 | lex();
|
---|
| 894 | switch (sym) {
|
---|
| 895 | case NUMBER:
|
---|
| 896 | u = mkcell(NUM, NULL, atof(text));
|
---|
| 897 | p = node1(VALUE, u);
|
---|
| 898 | p = node1(FIELD, p);
|
---|
| 899 | lex();
|
---|
| 900 | break;
|
---|
| 901 | case IDENT: case ARG: case '(':
|
---|
| 902 | p = node1(FIELD, expr10());
|
---|
| 903 | break;
|
---|
| 904 | default:
|
---|
| 905 | synerr("number or identifier expected after '$'", (char *)0);
|
---|
| 906 | }
|
---|
| 907 | break;
|
---|
| 908 | case DIV:
|
---|
| 909 | regexflg++;
|
---|
| 910 | lex();
|
---|
| 911 | regexflg = 0;
|
---|
| 912 | u = mkcell(PAT, NULL, 0.0);
|
---|
| 913 | u->c_sval = (char *) mkpat(text);
|
---|
| 914 | p = node1(VALUE, u);
|
---|
| 915 | lex();
|
---|
| 916 | break;
|
---|
| 917 | case GETLINE:
|
---|
| 918 | getlineflg++;
|
---|
| 919 | lex();
|
---|
| 920 | if (sym == IDENT || sym == STRING || sym == ARG)
|
---|
| 921 | q = expr10(); /* read into var */
|
---|
| 922 | else
|
---|
| 923 | q = NULL;
|
---|
| 924 | getlineflg = 0;
|
---|
| 925 | if (sym == R_IN) {
|
---|
| 926 | op = R_IN;
|
---|
| 927 | lex();
|
---|
| 928 | p = expr10();
|
---|
| 929 | }
|
---|
| 930 | else
|
---|
| 931 | op = (int) (p = NULL);
|
---|
| 932 | p = node3(GETLINE, q, p, (NODE *)op);
|
---|
| 933 | break;
|
---|
| 934 | default:
|
---|
| 935 | synerr(
|
---|
| 936 | "identifier, number, string, argument, regexpr, call or '(' expected");
|
---|
| 937 | break;
|
---|
| 938 | }
|
---|
| 939 | return p;
|
---|
| 940 | }
|
---|
| 941 |
|
---|
| 942 | static NODE *
|
---|
| 943 | dofuncn(fun, op) CELL *op;
|
---|
| 944 | {
|
---|
| 945 | NODE *p;
|
---|
| 946 | int i, j;
|
---|
| 947 | int n = 0;
|
---|
| 948 | NODE *a[100];
|
---|
| 949 |
|
---|
| 950 | if (lex() == '(') {
|
---|
| 951 | prmflg++;
|
---|
| 952 | for (lex(); sym && (sym != ')'); n++) {
|
---|
| 953 | if ((int)op == SPLIT && n == 1) {
|
---|
| 954 | /*
|
---|
| 955 | printf("sym(%d)sym1(%d)(%d)\n", sym, sym1, isarg(text));
|
---|
| 956 | */
|
---|
| 957 | if (sym != ARG) { /*isarg(text) == -1*/
|
---|
| 958 | /* make an array if not exist */
|
---|
| 959 | prmflg = 0;
|
---|
| 960 | getvar(text, hashtab, ARR);
|
---|
| 961 | prmflg++;
|
---|
| 962 | }
|
---|
| 963 | }
|
---|
| 964 | a[n] = expr();
|
---|
| 965 | if (sym == ',')
|
---|
| 966 | lex();
|
---|
| 967 | else if (sym != ')')
|
---|
| 968 | synerr("',' or ')' expected");
|
---|
| 969 | }
|
---|
| 970 | prmflg = 0;
|
---|
| 971 |
|
---|
| 972 | if (sym == ')')
|
---|
| 973 | lex();
|
---|
| 974 | else
|
---|
| 975 | synerr("')' expected");
|
---|
| 976 | }
|
---|
| 977 | p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * (n + 2));
|
---|
| 978 | p->n_type = fun;
|
---|
| 979 | p->n_next = NULL;
|
---|
| 980 | p->n_arg[0] = (NODE *) op;
|
---|
| 981 | p->n_arg[1] = (NODE *) n;
|
---|
| 982 | for (i = 0, j = 2; i < n; )
|
---|
| 983 | p->n_arg[j++] = a[i++];
|
---|
| 984 | p->n_arg[j] = NULL;
|
---|
| 985 | return p;
|
---|
| 986 | }
|
---|
| 987 |
|
---|
| 988 | static NODE *
|
---|
| 989 | doarray(u) CELL *u;
|
---|
| 990 | {
|
---|
| 991 | NODE *p;
|
---|
| 992 | int i, j;
|
---|
| 993 | int n;
|
---|
| 994 | NODE *a[20];
|
---|
| 995 |
|
---|
| 996 | for (lex(), n = 0; sym && sym != ']'; n++) {
|
---|
| 997 | a[n] = expr();
|
---|
| 998 | if (sym == ',')
|
---|
| 999 | lex();
|
---|
| 1000 | }
|
---|
| 1001 | if (sym != ']')
|
---|
| 1002 | synerr("']' expected");
|
---|
| 1003 | /* left ']' for expr10() */
|
---|
| 1004 | p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * (n + 1));
|
---|
| 1005 | p->n_type = ARRAY;
|
---|
| 1006 | p->n_next = NULL;
|
---|
| 1007 | p->n_arg[0] = (NODE *)u;
|
---|
| 1008 | p->n_arg[1] = (NODE *) n;
|
---|
| 1009 | for (i = 0, j = 2; i < n; )
|
---|
| 1010 | p->n_arg[j++] = a[i++];
|
---|
| 1011 | return p;
|
---|
| 1012 | }
|
---|
| 1013 |
|
---|
| 1014 | static NODE *
|
---|
| 1015 | doelement(q) NODE *q;
|
---|
| 1016 | {
|
---|
| 1017 | NODE *p;
|
---|
| 1018 | int i, j;
|
---|
| 1019 | int n;
|
---|
| 1020 | NODE *a[20];
|
---|
| 1021 |
|
---|
| 1022 | a[0] = q;
|
---|
| 1023 | for (lex(), n = 1; sym && sym != ')'; n++) {
|
---|
| 1024 | a[n] = expr();
|
---|
| 1025 | if (sym == ',')
|
---|
| 1026 | lex();
|
---|
| 1027 | else if (sym != ')')
|
---|
| 1028 | synerr("',' or ')' expected");
|
---|
| 1029 | }
|
---|
| 1030 | /* left ')' for expr10() */
|
---|
| 1031 | p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * (n + 1));
|
---|
| 1032 | p->n_type = ELEMENT;
|
---|
| 1033 | p->n_next = NULL;
|
---|
| 1034 | p->n_arg[0] = NULL;
|
---|
| 1035 | p->n_arg[1] = (NODE *) n;
|
---|
| 1036 | for (i = 0, j = 2; i < n; )
|
---|
| 1037 | p->n_arg[j++] = a[i++];
|
---|
| 1038 | return p;
|
---|
| 1039 | }
|
---|
| 1040 |
|
---|
| 1041 | synerr(s, t) char *s, *t;
|
---|
| 1042 | {
|
---|
| 1043 | extern int lineno;
|
---|
| 1044 | extern char line[], *linep;
|
---|
| 1045 | int c, i;
|
---|
| 1046 | char *u, *v;
|
---|
| 1047 |
|
---|
| 1048 | fprintf(stderr, "%s: Syntax error at line %d", cmd, lineno);
|
---|
| 1049 | if (funflg)
|
---|
| 1050 | fprintf(stderr, " in function %s", funnam);
|
---|
| 1051 | fprintf(stderr, ":\n");
|
---|
| 1052 | if ((v = linep - 1) < line)
|
---|
| 1053 | v = line + BUFSIZ - 1;
|
---|
| 1054 | for (i = 0, u = v - 1; ; --u) {
|
---|
| 1055 | if (u < line) {
|
---|
| 1056 | if (line[BUFSIZ - 1] == '\0')
|
---|
| 1057 | break;
|
---|
| 1058 | u = line + BUFSIZ - 1;
|
---|
| 1059 | }
|
---|
| 1060 | if (*u == '\n' && ++i == 2)
|
---|
| 1061 | break;
|
---|
| 1062 | }
|
---|
| 1063 | if (u != v) {
|
---|
| 1064 | while (u != v) {
|
---|
| 1065 | fputc(*u, stderr);
|
---|
| 1066 | if ((++u - line) == BUFSIZ)
|
---|
| 1067 | u = line;
|
---|
| 1068 | }
|
---|
| 1069 | if (*u != '\n')
|
---|
| 1070 | fputc(*u, stderr);
|
---|
| 1071 | fprintf(stderr, " <--\n\n");
|
---|
| 1072 | /*
|
---|
| 1073 | fprintf(stderr, " <-- ");
|
---|
| 1074 | while ((c = Getc()) != EOF && c != '\n')
|
---|
| 1075 | fputc(c, stderr);
|
---|
| 1076 | fprintf(stderr, "\n");
|
---|
| 1077 | if (c == EOF);
|
---|
| 1078 | fprintf(stderr, "\n");
|
---|
| 1079 | */
|
---|
| 1080 | }
|
---|
| 1081 | fprintf(stderr, s, t);
|
---|
| 1082 | fprintf(stderr, "\n");
|
---|
| 1083 | #ifdef DOS
|
---|
| 1084 | closeall();
|
---|
| 1085 | #endif
|
---|
| 1086 | exit(1);
|
---|
| 1087 | }
|
---|