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726f6388 JA |
1 | /* expr.c -- arithmetic expression evaluation. */ |
2 | ||
d3ad40de | 3 | /* Copyright (C) 1990-2006 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
bb70624e | 9 | the Free Software Foundation; either version 2, or (at your option) |
726f6388 JA |
10 | any later version. |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash; see the file COPYING. If not, write to the Free | |
bb70624e | 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 JA |
20 | |
21 | /* | |
7117c2d2 | 22 | All arithmetic is done as intmax_t integers with no checking for overflow |
726f6388 JA |
23 | (though division by 0 is caught and flagged as an error). |
24 | ||
25 | The following operators are handled, grouped into a set of levels in | |
26 | order of decreasing precedence. | |
27 | ||
bb70624e JA |
28 | "id++", "id--" [post-increment and post-decrement] |
29 | "++id", "--id" [pre-increment and pre-decrement] | |
726f6388 JA |
30 | "-", "+" [(unary operators)] |
31 | "!", "~" | |
cce855bc | 32 | "**" [(exponentiation)] |
726f6388 JA |
33 | "*", "/", "%" |
34 | "+", "-" | |
35 | "<<", ">>" | |
36 | "<=", ">=", "<", ">" | |
37 | "==", "!=" | |
38 | "&" | |
39 | "^" | |
40 | "|" | |
41 | "&&" | |
42 | "||" | |
ccc6cda3 | 43 | "expr ? expr : expr" |
cce855bc | 44 | "=", "*=", "/=", "%=", "+=", "-=", "<<=", ">>=", "&=", "^=", "|=" |
5565fb1a | 45 | , [comma] |
726f6388 JA |
46 | |
47 | (Note that most of these operators have special meaning to bash, and an | |
48 | entire expression should be quoted, e.g. "a=$a+1" or "a=a+1" to ensure | |
49 | that it is passed intact to the evaluator when using `let'. When using | |
50 | the $[] or $(( )) forms, the text between the `[' and `]' or `((' and `))' | |
51 | is treated as if in double quotes.) | |
52 | ||
53 | Sub-expressions within parentheses have a precedence level greater than | |
54 | all of the above levels and are evaluated first. Within a single prece- | |
55 | dence group, evaluation is left-to-right, except for the arithmetic | |
56 | assignment operator (`='), which is evaluated right-to-left (as in C). | |
57 | ||
58 | The expression evaluator returns the value of the expression (assignment | |
59 | statements have as a value what is returned by the RHS). The `let' | |
60 | builtin, on the other hand, returns 0 if the last expression evaluates to | |
61 | a non-zero, and 1 otherwise. | |
62 | ||
63 | Implementation is a recursive-descent parser. | |
64 | ||
65 | Chet Ramey | |
66 | chet@ins.CWRU.Edu | |
67 | */ | |
68 | ||
ccc6cda3 JA |
69 | #include "config.h" |
70 | ||
726f6388 JA |
71 | #include <stdio.h> |
72 | #include "bashansi.h" | |
cce855bc | 73 | |
ccc6cda3 | 74 | #if defined (HAVE_UNISTD_H) |
cce855bc JA |
75 | # ifdef _MINIX |
76 | # include <sys/types.h> | |
77 | # endif | |
ccc6cda3 JA |
78 | # include <unistd.h> |
79 | #endif | |
726f6388 | 80 | |
f73dda09 | 81 | #include "chartypes.h" |
5e13499c | 82 | #include "bashintl.h" |
bb70624e | 83 | |
ccc6cda3 | 84 | #include "shell.h" |
726f6388 JA |
85 | |
86 | /* Because of the $((...)) construct, expressions may include newlines. | |
87 | Here is a macro which accepts newlines, tabs and spaces as whitespace. */ | |
88 | #define cr_whitespace(c) (whitespace(c) || ((c) == '\n')) | |
89 | ||
726f6388 JA |
90 | /* Size be which the expression stack grows when neccessary. */ |
91 | #define EXPR_STACK_GROW_SIZE 10 | |
92 | ||
93 | /* Maximum amount of recursion allowed. This prevents a non-integer | |
94 | variable such as "num=num+2" from infinitely adding to itself when | |
ccc6cda3 | 95 | "let num=num+2" is given. */ |
726f6388 JA |
96 | #define MAX_EXPR_RECURSION_LEVEL 1024 |
97 | ||
98 | /* The Tokens. Singing "The Lion Sleeps Tonight". */ | |
99 | ||
100 | #define EQEQ 1 /* "==" */ | |
101 | #define NEQ 2 /* "!=" */ | |
102 | #define LEQ 3 /* "<=" */ | |
103 | #define GEQ 4 /* ">=" */ | |
104 | #define STR 5 /* string */ | |
105 | #define NUM 6 /* number */ | |
106 | #define LAND 7 /* "&&" Logical AND */ | |
107 | #define LOR 8 /* "||" Logical OR */ | |
108 | #define LSH 9 /* "<<" Left SHift */ | |
109 | #define RSH 10 /* ">>" Right SHift */ | |
110 | #define OP_ASSIGN 11 /* op= expassign as in Posix.2 */ | |
cce855bc JA |
111 | #define COND 12 /* exp1 ? exp2 : exp3 */ |
112 | #define POWER 13 /* exp1**exp2 */ | |
bb70624e JA |
113 | #define PREINC 14 /* ++var */ |
114 | #define PREDEC 15 /* --var */ | |
115 | #define POSTINC 16 /* var++ */ | |
116 | #define POSTDEC 17 /* var-- */ | |
726f6388 JA |
117 | #define EQ '=' |
118 | #define GT '>' | |
119 | #define LT '<' | |
120 | #define PLUS '+' | |
121 | #define MINUS '-' | |
122 | #define MUL '*' | |
123 | #define DIV '/' | |
124 | #define MOD '%' | |
125 | #define NOT '!' | |
126 | #define LPAR '(' | |
127 | #define RPAR ')' | |
128 | #define BAND '&' /* Bitwise AND */ | |
ccc6cda3 | 129 | #define BOR '|' /* Bitwise OR. */ |
726f6388 JA |
130 | #define BXOR '^' /* Bitwise eXclusive OR. */ |
131 | #define BNOT '~' /* Bitwise NOT; Two's complement. */ | |
ccc6cda3 JA |
132 | #define QUES '?' |
133 | #define COL ':' | |
bb70624e JA |
134 | #define COMMA ',' |
135 | ||
136 | /* This should be the function corresponding to the operator with the | |
137 | highest precedence. */ | |
138 | #define EXP_HIGHEST expcomma | |
ccc6cda3 JA |
139 | |
140 | static char *expression; /* The current expression */ | |
141 | static char *tp; /* token lexical position */ | |
142 | static char *lasttp; /* pointer to last token position */ | |
143 | static int curtok; /* the current token */ | |
144 | static int lasttok; /* the previous token */ | |
145 | static int assigntok; /* the OP in OP= */ | |
146 | static char *tokstr; /* current token string */ | |
7117c2d2 | 147 | static intmax_t tokval; /* current token value */ |
ccc6cda3 JA |
148 | static int noeval; /* set to 1 if no assignment to be done */ |
149 | static procenv_t evalbuf; | |
150 | ||
dc8fbaf9 | 151 | static int _is_arithop __P((int)); |
f73dda09 | 152 | static void readtok __P((void)); /* lexical analyzer */ |
7117c2d2 JA |
153 | |
154 | static intmax_t expr_streval __P((char *, int)); | |
155 | static intmax_t strlong __P((char *)); | |
d3ad40de | 156 | static void evalerror __P((const char *)); |
f73dda09 JA |
157 | |
158 | static void pushexp __P((void)); | |
159 | static void popexp __P((void)); | |
7117c2d2 | 160 | static void expr_unwind __P((void)); |
d3a24ed2 | 161 | static void expr_bind_variable __P((char *, char *)); |
7117c2d2 JA |
162 | |
163 | static intmax_t subexpr __P((char *)); | |
164 | ||
165 | static intmax_t expcomma __P((void)); | |
166 | static intmax_t expassign __P((void)); | |
167 | static intmax_t expcond __P((void)); | |
168 | static intmax_t explor __P((void)); | |
169 | static intmax_t expland __P((void)); | |
170 | static intmax_t expbor __P((void)); | |
171 | static intmax_t expbxor __P((void)); | |
172 | static intmax_t expband __P((void)); | |
173 | static intmax_t exp5 __P((void)); | |
174 | static intmax_t exp4 __P((void)); | |
175 | static intmax_t expshift __P((void)); | |
176 | static intmax_t exp3 __P((void)); | |
177 | static intmax_t exp2 __P((void)); | |
178 | static intmax_t exppower __P((void)); | |
179 | static intmax_t exp1 __P((void)); | |
180 | static intmax_t exp0 __P((void)); | |
ccc6cda3 JA |
181 | |
182 | /* A structure defining a single expression context. */ | |
183 | typedef struct { | |
184 | int curtok, lasttok; | |
bb70624e | 185 | char *expression, *tp, *lasttp; |
7117c2d2 | 186 | intmax_t tokval; |
ccc6cda3 | 187 | char *tokstr; |
bb70624e | 188 | int noeval; |
ccc6cda3 JA |
189 | } EXPR_CONTEXT; |
190 | ||
f73dda09 JA |
191 | #ifdef INCLUDE_UNUSED |
192 | /* Not used yet. */ | |
bb70624e JA |
193 | typedef struct { |
194 | char *tokstr; | |
7117c2d2 | 195 | intmax_t tokval; |
bb70624e | 196 | } LVALUE; |
f73dda09 | 197 | #endif |
bb70624e | 198 | |
ccc6cda3 JA |
199 | /* Global var which contains the stack of expression contexts. */ |
200 | static EXPR_CONTEXT **expr_stack; | |
201 | static int expr_depth; /* Location in the stack. */ | |
202 | static int expr_stack_size; /* Number of slots already allocated. */ | |
203 | ||
204 | extern char *this_command_name; | |
7117c2d2 | 205 | extern int unbound_vars_is_error; |
726f6388 | 206 | |
5e13499c | 207 | #if defined (ARRAY_VARS) |
d3ad40de | 208 | extern const char * const bash_badsub_errmsg; |
5e13499c CR |
209 | #endif |
210 | ||
bb70624e JA |
211 | #define SAVETOK(X) \ |
212 | do { \ | |
213 | (X)->curtok = curtok; \ | |
214 | (X)->lasttok = lasttok; \ | |
215 | (X)->tp = tp; \ | |
216 | (X)->lasttp = lasttp; \ | |
217 | (X)->tokval = tokval; \ | |
218 | (X)->tokstr = tokstr; \ | |
219 | (X)->noeval = noeval; \ | |
220 | } while (0) | |
221 | ||
222 | #define RESTORETOK(X) \ | |
223 | do { \ | |
224 | curtok = (X)->curtok; \ | |
225 | lasttok = (X)->lasttok; \ | |
226 | tp = (X)->tp; \ | |
227 | lasttp = (X)->lasttp; \ | |
228 | tokval = (X)->tokval; \ | |
229 | tokstr = (X)->tokstr; \ | |
230 | noeval = (X)->noeval; \ | |
231 | } while (0) | |
232 | ||
726f6388 JA |
233 | /* Push and save away the contents of the globals describing the |
234 | current expression context. */ | |
235 | static void | |
236 | pushexp () | |
237 | { | |
238 | EXPR_CONTEXT *context; | |
239 | ||
726f6388 | 240 | if (expr_depth >= MAX_EXPR_RECURSION_LEVEL) |
5e13499c | 241 | evalerror (_("expression recursion level exceeded")); |
726f6388 JA |
242 | |
243 | if (expr_depth >= expr_stack_size) | |
244 | { | |
f73dda09 JA |
245 | expr_stack_size += EXPR_STACK_GROW_SIZE; |
246 | expr_stack = (EXPR_CONTEXT **)xrealloc (expr_stack, expr_stack_size * sizeof (EXPR_CONTEXT *)); | |
726f6388 JA |
247 | } |
248 | ||
d166f048 JA |
249 | context = (EXPR_CONTEXT *)xmalloc (sizeof (EXPR_CONTEXT)); |
250 | ||
726f6388 | 251 | context->expression = expression; |
bb70624e JA |
252 | SAVETOK(context); |
253 | ||
726f6388 JA |
254 | expr_stack[expr_depth++] = context; |
255 | } | |
256 | ||
257 | /* Pop the the contents of the expression context stack into the | |
258 | globals describing the current expression context. */ | |
259 | static void | |
260 | popexp () | |
261 | { | |
262 | EXPR_CONTEXT *context; | |
263 | ||
264 | if (expr_depth == 0) | |
5e13499c | 265 | evalerror (_("recursion stack underflow")); |
726f6388 JA |
266 | |
267 | context = expr_stack[--expr_depth]; | |
bb70624e | 268 | |
726f6388 | 269 | expression = context->expression; |
bb70624e JA |
270 | RESTORETOK (context); |
271 | ||
726f6388 JA |
272 | free (context); |
273 | } | |
274 | ||
7117c2d2 JA |
275 | static void |
276 | expr_unwind () | |
277 | { | |
278 | while (--expr_depth > 0) | |
279 | { | |
280 | if (expr_stack[expr_depth]->tokstr) | |
281 | free (expr_stack[expr_depth]->tokstr); | |
282 | ||
283 | if (expr_stack[expr_depth]->expression) | |
284 | free (expr_stack[expr_depth]->expression); | |
285 | ||
286 | free (expr_stack[expr_depth]); | |
287 | } | |
288 | free (expr_stack[expr_depth]); /* free the allocated EXPR_CONTEXT */ | |
53ac45a3 CR |
289 | |
290 | noeval = 0; /* XXX */ | |
7117c2d2 JA |
291 | } |
292 | ||
d3a24ed2 CR |
293 | static void |
294 | expr_bind_variable (lhs, rhs) | |
295 | char *lhs, *rhs; | |
296 | { | |
297 | (void)bind_int_variable (lhs, rhs); | |
298 | stupidly_hack_special_variables (lhs); | |
299 | } | |
300 | ||
d166f048 JA |
301 | /* Evaluate EXPR, and return the arithmetic result. If VALIDP is |
302 | non-null, a zero is stored into the location to which it points | |
303 | if the expression is invalid, non-zero otherwise. If a non-zero | |
304 | value is returned in *VALIDP, the return value of evalexp() may | |
305 | be used. | |
726f6388 JA |
306 | |
307 | The `while' loop after the longjmp is caught relies on the above | |
308 | implementation of pushexp and popexp leaving in expr_stack[0] the | |
309 | values that the variables had when the program started. That is, | |
ccc6cda3 | 310 | the first things saved are the initial values of the variables that |
726f6388 JA |
311 | were assigned at program startup or by the compiler. Therefore, it is |
312 | safe to let the loop terminate when expr_depth == 0, without freeing up | |
313 | any of the expr_depth[0] stuff. */ | |
7117c2d2 | 314 | intmax_t |
d166f048 | 315 | evalexp (expr, validp) |
726f6388 | 316 | char *expr; |
d166f048 | 317 | int *validp; |
726f6388 | 318 | { |
7117c2d2 | 319 | intmax_t val; |
d3a24ed2 CR |
320 | int c; |
321 | procenv_t oevalbuf; | |
726f6388 | 322 | |
f73dda09 | 323 | val = 0; |
53ac45a3 | 324 | noeval = 0; |
726f6388 | 325 | |
d3a24ed2 CR |
326 | FASTCOPY (evalbuf, oevalbuf, sizeof (evalbuf)); |
327 | ||
328 | c = setjmp (evalbuf); | |
329 | ||
330 | if (c) | |
726f6388 | 331 | { |
d166f048 JA |
332 | FREE (tokstr); |
333 | FREE (expression); | |
334 | tokstr = expression = (char *)NULL; | |
726f6388 | 335 | |
7117c2d2 | 336 | expr_unwind (); |
d166f048 JA |
337 | |
338 | if (validp) | |
339 | *validp = 0; | |
f73dda09 | 340 | return (0); |
726f6388 JA |
341 | } |
342 | ||
d166f048 JA |
343 | val = subexpr (expr); |
344 | ||
d166f048 JA |
345 | if (validp) |
346 | *validp = 1; | |
347 | ||
d3a24ed2 CR |
348 | FASTCOPY (oevalbuf, evalbuf, sizeof (evalbuf)); |
349 | ||
d166f048 JA |
350 | return (val); |
351 | } | |
352 | ||
7117c2d2 | 353 | static intmax_t |
d166f048 JA |
354 | subexpr (expr) |
355 | char *expr; | |
356 | { | |
7117c2d2 | 357 | intmax_t val; |
d166f048 JA |
358 | char *p; |
359 | ||
360 | for (p = expr; p && *p && cr_whitespace (*p); p++) | |
361 | ; | |
362 | ||
363 | if (p == NULL || *p == '\0') | |
f73dda09 | 364 | return (0); |
d166f048 | 365 | |
726f6388 JA |
366 | pushexp (); |
367 | curtok = lasttok = 0; | |
368 | expression = savestring (expr); | |
369 | tp = expression; | |
370 | ||
371 | tokstr = (char *)NULL; | |
f73dda09 | 372 | tokval = 0; |
726f6388 JA |
373 | |
374 | readtok (); | |
375 | ||
bb70624e | 376 | val = EXP_HIGHEST (); |
726f6388 | 377 | |
ccc6cda3 | 378 | if (curtok != 0) |
5e13499c | 379 | evalerror (_("syntax error in expression")); |
726f6388 | 380 | |
d166f048 JA |
381 | FREE (tokstr); |
382 | FREE (expression); | |
726f6388 JA |
383 | |
384 | popexp (); | |
385 | ||
d166f048 | 386 | return val; |
726f6388 JA |
387 | } |
388 | ||
7117c2d2 | 389 | static intmax_t |
bb70624e | 390 | expcomma () |
726f6388 | 391 | { |
7117c2d2 | 392 | register intmax_t value; |
726f6388 | 393 | |
bb70624e JA |
394 | value = expassign (); |
395 | while (curtok == COMMA) | |
726f6388 | 396 | { |
bb70624e JA |
397 | readtok (); |
398 | value = expassign (); | |
726f6388 JA |
399 | } |
400 | ||
bb70624e | 401 | return value; |
726f6388 | 402 | } |
bb70624e | 403 | |
7117c2d2 | 404 | static intmax_t |
726f6388 JA |
405 | expassign () |
406 | { | |
7117c2d2 | 407 | register intmax_t value; |
726f6388 JA |
408 | char *lhs, *rhs; |
409 | ||
ccc6cda3 | 410 | value = expcond (); |
726f6388 JA |
411 | if (curtok == EQ || curtok == OP_ASSIGN) |
412 | { | |
ccc6cda3 | 413 | int special, op; |
7117c2d2 | 414 | intmax_t lvalue; |
726f6388 | 415 | |
ccc6cda3 JA |
416 | special = curtok == OP_ASSIGN; |
417 | ||
726f6388 | 418 | if (lasttok != STR) |
5e13499c | 419 | evalerror (_("attempted assignment to non-variable")); |
726f6388 JA |
420 | |
421 | if (special) | |
422 | { | |
423 | op = assigntok; /* a OP= b */ | |
424 | lvalue = value; | |
425 | } | |
426 | ||
427 | lhs = savestring (tokstr); | |
428 | readtok (); | |
429 | value = expassign (); | |
430 | ||
431 | if (special) | |
432 | { | |
433 | switch (op) | |
434 | { | |
435 | case MUL: | |
436 | lvalue *= value; | |
437 | break; | |
438 | case DIV: | |
7117c2d2 | 439 | if (value == 0) |
5e13499c | 440 | evalerror (_("division by 0")); |
726f6388 JA |
441 | lvalue /= value; |
442 | break; | |
443 | case MOD: | |
7117c2d2 | 444 | if (value == 0) |
5e13499c | 445 | evalerror (_("division by 0")); |
726f6388 JA |
446 | lvalue %= value; |
447 | break; | |
448 | case PLUS: | |
449 | lvalue += value; | |
450 | break; | |
451 | case MINUS: | |
452 | lvalue -= value; | |
453 | break; | |
454 | case LSH: | |
455 | lvalue <<= value; | |
456 | break; | |
457 | case RSH: | |
458 | lvalue >>= value; | |
459 | break; | |
460 | case BAND: | |
461 | lvalue &= value; | |
462 | break; | |
463 | case BOR: | |
464 | lvalue |= value; | |
465 | break; | |
28ef6c31 JA |
466 | case BXOR: |
467 | lvalue ^= value; | |
468 | break; | |
726f6388 | 469 | default: |
d166f048 | 470 | free (lhs); |
5e13499c | 471 | evalerror (_("bug: bad expassign token")); |
726f6388 JA |
472 | break; |
473 | } | |
474 | value = lvalue; | |
475 | } | |
476 | ||
477 | rhs = itos (value); | |
ccc6cda3 | 478 | if (noeval == 0) |
d3a24ed2 | 479 | expr_bind_variable (lhs, rhs); |
726f6388 JA |
480 | free (rhs); |
481 | free (lhs); | |
d166f048 | 482 | FREE (tokstr); |
726f6388 JA |
483 | tokstr = (char *)NULL; /* For freeing on errors. */ |
484 | } | |
485 | return (value); | |
486 | } | |
487 | ||
ccc6cda3 | 488 | /* Conditional expression (expr?expr:expr) */ |
7117c2d2 | 489 | static intmax_t |
ccc6cda3 JA |
490 | expcond () |
491 | { | |
7117c2d2 | 492 | intmax_t cval, val1, val2, rval; |
d166f048 JA |
493 | int set_noeval; |
494 | ||
495 | set_noeval = 0; | |
ccc6cda3 JA |
496 | rval = cval = explor (); |
497 | if (curtok == QUES) /* found conditional expr */ | |
498 | { | |
499 | readtok (); | |
500 | if (curtok == 0 || curtok == COL) | |
5e13499c | 501 | evalerror (_("expression expected")); |
ccc6cda3 | 502 | if (cval == 0) |
d166f048 JA |
503 | { |
504 | set_noeval = 1; | |
505 | noeval++; | |
506 | } | |
f73dda09 | 507 | |
bb70624e | 508 | val1 = EXP_HIGHEST (); |
f73dda09 | 509 | |
d166f048 | 510 | if (set_noeval) |
28ef6c31 | 511 | noeval--; |
ccc6cda3 | 512 | if (curtok != COL) |
5e13499c | 513 | evalerror (_("`:' expected for conditional expression")); |
ccc6cda3 JA |
514 | readtok (); |
515 | if (curtok == 0) | |
5e13499c | 516 | evalerror (_("expression expected")); |
d166f048 | 517 | set_noeval = 0; |
ccc6cda3 | 518 | if (cval) |
d166f048 JA |
519 | { |
520 | set_noeval = 1; | |
521 | noeval++; | |
522 | } | |
adfe6c99 CR |
523 | |
524 | val2 = expcond (); | |
d166f048 | 525 | if (set_noeval) |
28ef6c31 | 526 | noeval--; |
ccc6cda3 JA |
527 | rval = cval ? val1 : val2; |
528 | lasttok = COND; | |
529 | } | |
530 | return rval; | |
531 | } | |
532 | ||
726f6388 | 533 | /* Logical OR. */ |
7117c2d2 | 534 | static intmax_t |
726f6388 JA |
535 | explor () |
536 | { | |
7117c2d2 | 537 | register intmax_t val1, val2; |
d166f048 | 538 | int set_noeval; |
726f6388 JA |
539 | |
540 | val1 = expland (); | |
541 | ||
542 | while (curtok == LOR) | |
543 | { | |
d166f048 | 544 | set_noeval = 0; |
ccc6cda3 | 545 | if (val1 != 0) |
d166f048 JA |
546 | { |
547 | noeval++; | |
548 | set_noeval = 1; | |
549 | } | |
550 | readtok (); | |
726f6388 | 551 | val2 = expland (); |
d166f048 | 552 | if (set_noeval) |
ccc6cda3 | 553 | noeval--; |
726f6388 | 554 | val1 = val1 || val2; |
d166f048 | 555 | lasttok = LOR; |
726f6388 JA |
556 | } |
557 | ||
558 | return (val1); | |
559 | } | |
560 | ||
561 | /* Logical AND. */ | |
7117c2d2 | 562 | static intmax_t |
726f6388 JA |
563 | expland () |
564 | { | |
7117c2d2 | 565 | register intmax_t val1, val2; |
d166f048 | 566 | int set_noeval; |
726f6388 JA |
567 | |
568 | val1 = expbor (); | |
569 | ||
570 | while (curtok == LAND) | |
571 | { | |
d166f048 | 572 | set_noeval = 0; |
ccc6cda3 | 573 | if (val1 == 0) |
d166f048 JA |
574 | { |
575 | set_noeval = 1; | |
576 | noeval++; | |
577 | } | |
578 | readtok (); | |
726f6388 | 579 | val2 = expbor (); |
d166f048 | 580 | if (set_noeval) |
ccc6cda3 | 581 | noeval--; |
726f6388 | 582 | val1 = val1 && val2; |
d166f048 | 583 | lasttok = LAND; |
726f6388 JA |
584 | } |
585 | ||
586 | return (val1); | |
587 | } | |
588 | ||
589 | /* Bitwise OR. */ | |
7117c2d2 | 590 | static intmax_t |
726f6388 JA |
591 | expbor () |
592 | { | |
7117c2d2 | 593 | register intmax_t val1, val2; |
726f6388 JA |
594 | |
595 | val1 = expbxor (); | |
596 | ||
597 | while (curtok == BOR) | |
598 | { | |
599 | readtok (); | |
600 | val2 = expbxor (); | |
601 | val1 = val1 | val2; | |
602 | } | |
603 | ||
604 | return (val1); | |
605 | } | |
606 | ||
607 | /* Bitwise XOR. */ | |
7117c2d2 | 608 | static intmax_t |
726f6388 JA |
609 | expbxor () |
610 | { | |
7117c2d2 | 611 | register intmax_t val1, val2; |
726f6388 JA |
612 | |
613 | val1 = expband (); | |
614 | ||
615 | while (curtok == BXOR) | |
616 | { | |
617 | readtok (); | |
618 | val2 = expband (); | |
619 | val1 = val1 ^ val2; | |
620 | } | |
621 | ||
622 | return (val1); | |
623 | } | |
624 | ||
625 | /* Bitwise AND. */ | |
7117c2d2 | 626 | static intmax_t |
726f6388 JA |
627 | expband () |
628 | { | |
7117c2d2 | 629 | register intmax_t val1, val2; |
726f6388 JA |
630 | |
631 | val1 = exp5 (); | |
632 | ||
633 | while (curtok == BAND) | |
634 | { | |
635 | readtok (); | |
636 | val2 = exp5 (); | |
637 | val1 = val1 & val2; | |
638 | } | |
639 | ||
640 | return (val1); | |
641 | } | |
642 | ||
7117c2d2 | 643 | static intmax_t |
726f6388 JA |
644 | exp5 () |
645 | { | |
7117c2d2 | 646 | register intmax_t val1, val2; |
726f6388 JA |
647 | |
648 | val1 = exp4 (); | |
649 | ||
650 | while ((curtok == EQEQ) || (curtok == NEQ)) | |
651 | { | |
652 | int op = curtok; | |
653 | ||
654 | readtok (); | |
655 | val2 = exp4 (); | |
656 | if (op == EQEQ) | |
657 | val1 = (val1 == val2); | |
658 | else if (op == NEQ) | |
659 | val1 = (val1 != val2); | |
660 | } | |
661 | return (val1); | |
662 | } | |
663 | ||
7117c2d2 | 664 | static intmax_t |
726f6388 JA |
665 | exp4 () |
666 | { | |
7117c2d2 | 667 | register intmax_t val1, val2; |
726f6388 JA |
668 | |
669 | val1 = expshift (); | |
670 | while ((curtok == LEQ) || | |
671 | (curtok == GEQ) || | |
672 | (curtok == LT) || | |
673 | (curtok == GT)) | |
674 | { | |
675 | int op = curtok; | |
676 | ||
677 | readtok (); | |
678 | val2 = expshift (); | |
679 | ||
680 | if (op == LEQ) | |
681 | val1 = val1 <= val2; | |
682 | else if (op == GEQ) | |
683 | val1 = val1 >= val2; | |
684 | else if (op == LT) | |
685 | val1 = val1 < val2; | |
d166f048 | 686 | else /* (op == GT) */ |
726f6388 JA |
687 | val1 = val1 > val2; |
688 | } | |
689 | return (val1); | |
690 | } | |
691 | ||
692 | /* Left and right shifts. */ | |
7117c2d2 | 693 | static intmax_t |
726f6388 JA |
694 | expshift () |
695 | { | |
7117c2d2 | 696 | register intmax_t val1, val2; |
726f6388 JA |
697 | |
698 | val1 = exp3 (); | |
699 | ||
700 | while ((curtok == LSH) || (curtok == RSH)) | |
701 | { | |
702 | int op = curtok; | |
703 | ||
704 | readtok (); | |
705 | val2 = exp3 (); | |
706 | ||
707 | if (op == LSH) | |
708 | val1 = val1 << val2; | |
709 | else | |
710 | val1 = val1 >> val2; | |
711 | } | |
712 | ||
713 | return (val1); | |
714 | } | |
715 | ||
7117c2d2 | 716 | static intmax_t |
726f6388 JA |
717 | exp3 () |
718 | { | |
7117c2d2 | 719 | register intmax_t val1, val2; |
726f6388 JA |
720 | |
721 | val1 = exp2 (); | |
722 | ||
723 | while ((curtok == PLUS) || (curtok == MINUS)) | |
724 | { | |
725 | int op = curtok; | |
726 | ||
727 | readtok (); | |
728 | val2 = exp2 (); | |
729 | ||
730 | if (op == PLUS) | |
731 | val1 += val2; | |
732 | else if (op == MINUS) | |
733 | val1 -= val2; | |
734 | } | |
735 | return (val1); | |
736 | } | |
737 | ||
7117c2d2 | 738 | static intmax_t |
726f6388 JA |
739 | exp2 () |
740 | { | |
7117c2d2 | 741 | register intmax_t val1, val2; |
726f6388 | 742 | |
cce855bc | 743 | val1 = exppower (); |
726f6388 JA |
744 | |
745 | while ((curtok == MUL) || | |
28ef6c31 JA |
746 | (curtok == DIV) || |
747 | (curtok == MOD)) | |
726f6388 JA |
748 | { |
749 | int op = curtok; | |
750 | ||
751 | readtok (); | |
752 | ||
cce855bc | 753 | val2 = exppower (); |
726f6388 JA |
754 | |
755 | if (((op == DIV) || (op == MOD)) && (val2 == 0)) | |
5e13499c | 756 | evalerror (_("division by 0")); |
726f6388 JA |
757 | |
758 | if (op == MUL) | |
28ef6c31 | 759 | val1 *= val2; |
726f6388 | 760 | else if (op == DIV) |
28ef6c31 | 761 | val1 /= val2; |
726f6388 | 762 | else if (op == MOD) |
28ef6c31 | 763 | val1 %= val2; |
726f6388 JA |
764 | } |
765 | return (val1); | |
766 | } | |
767 | ||
7117c2d2 | 768 | static intmax_t |
cce855bc JA |
769 | exppower () |
770 | { | |
7117c2d2 | 771 | register intmax_t val1, val2, c; |
cce855bc JA |
772 | |
773 | val1 = exp1 (); | |
5565fb1a | 774 | while (curtok == POWER) |
cce855bc JA |
775 | { |
776 | readtok (); | |
b66cc816 | 777 | val2 = exppower (); /* exponentiation is right-associative */ |
cce855bc | 778 | if (val2 == 0) |
f73dda09 | 779 | return (1); |
bb70624e | 780 | if (val2 < 0) |
5e13499c | 781 | evalerror (_("exponent less than 0")); |
cce855bc JA |
782 | for (c = 1; val2--; c *= val1) |
783 | ; | |
784 | val1 = c; | |
785 | } | |
786 | return (val1); | |
787 | } | |
788 | ||
7117c2d2 | 789 | static intmax_t |
726f6388 JA |
790 | exp1 () |
791 | { | |
7117c2d2 | 792 | register intmax_t val; |
726f6388 JA |
793 | |
794 | if (curtok == NOT) | |
795 | { | |
796 | readtok (); | |
797 | val = !exp1 (); | |
798 | } | |
799 | else if (curtok == BNOT) | |
800 | { | |
801 | readtok (); | |
802 | val = ~exp1 (); | |
803 | } | |
804 | else | |
805 | val = exp0 (); | |
806 | ||
807 | return (val); | |
808 | } | |
809 | ||
7117c2d2 | 810 | static intmax_t |
726f6388 JA |
811 | exp0 () |
812 | { | |
7117c2d2 | 813 | register intmax_t val = 0, v2; |
bb70624e JA |
814 | char *vincdec; |
815 | int stok; | |
762a763b | 816 | EXPR_CONTEXT ec; |
bb70624e JA |
817 | |
818 | /* XXX - might need additional logic here to decide whether or not | |
819 | pre-increment or pre-decrement is legal at this point. */ | |
820 | if (curtok == PREINC || curtok == PREDEC) | |
821 | { | |
822 | stok = lasttok = curtok; | |
823 | readtok (); | |
824 | if (curtok != STR) | |
28ef6c31 | 825 | /* readtok() catches this */ |
5e13499c | 826 | evalerror (_("identifier expected after pre-increment or pre-decrement")); |
726f6388 | 827 | |
bb70624e JA |
828 | v2 = tokval + ((stok == PREINC) ? 1 : -1); |
829 | vincdec = itos (v2); | |
830 | if (noeval == 0) | |
d3a24ed2 | 831 | expr_bind_variable (tokstr, vincdec); |
bb70624e JA |
832 | free (vincdec); |
833 | val = v2; | |
834 | ||
835 | curtok = NUM; /* make sure --x=7 is flagged as an error */ | |
836 | readtok (); | |
837 | } | |
838 | else if (curtok == MINUS) | |
726f6388 JA |
839 | { |
840 | readtok (); | |
841 | val = - exp0 (); | |
842 | } | |
843 | else if (curtok == PLUS) | |
844 | { | |
845 | readtok (); | |
846 | val = exp0 (); | |
847 | } | |
848 | else if (curtok == LPAR) | |
849 | { | |
850 | readtok (); | |
bb70624e | 851 | val = EXP_HIGHEST (); |
726f6388 | 852 | |
5e13499c CR |
853 | if (curtok != RPAR) /* ( */ |
854 | evalerror (_("missing `)'")); | |
726f6388 JA |
855 | |
856 | /* Skip over closing paren. */ | |
857 | readtok (); | |
858 | } | |
859 | else if ((curtok == NUM) || (curtok == STR)) | |
860 | { | |
861 | val = tokval; | |
762a763b | 862 | if (curtok == STR) |
bb70624e | 863 | { |
762a763b CR |
864 | SAVETOK (&ec); |
865 | tokstr = (char *)NULL; /* keep it from being freed */ | |
866 | noeval = 1; | |
867 | readtok (); | |
868 | stok = curtok; | |
869 | ||
bb70624e | 870 | /* post-increment or post-decrement */ |
762a763b CR |
871 | if (stok == POSTINC || stok == POSTDEC) |
872 | { | |
873 | /* restore certain portions of EC */ | |
874 | tokstr = ec.tokstr; | |
875 | noeval = ec.noeval; | |
876 | lasttok = STR; /* ec.curtok */ | |
877 | ||
878 | v2 = val + ((stok == POSTINC) ? 1 : -1); | |
879 | vincdec = itos (v2); | |
880 | if (noeval == 0) | |
881 | expr_bind_variable (tokstr, vincdec); | |
882 | free (vincdec); | |
883 | curtok = NUM; /* make sure x++=7 is flagged as an error */ | |
884 | } | |
885 | else | |
886 | { | |
887 | if (stok == STR) /* free new tokstr before old one is restored */ | |
888 | FREE (tokstr); | |
889 | RESTORETOK (&ec); | |
890 | } | |
891 | ||
bb70624e JA |
892 | } |
893 | ||
726f6388 JA |
894 | readtok (); |
895 | } | |
896 | else | |
5e13499c | 897 | evalerror (_("syntax error: operand expected")); |
726f6388 JA |
898 | |
899 | return (val); | |
900 | } | |
901 | ||
7117c2d2 JA |
902 | static intmax_t |
903 | expr_streval (tok, e) | |
904 | char *tok; | |
905 | int e; | |
906 | { | |
907 | SHELL_VAR *v; | |
908 | char *value; | |
909 | intmax_t tval; | |
910 | ||
911 | /* [[[[[ */ | |
912 | #if defined (ARRAY_VARS) | |
913 | v = (e == ']') ? array_variable_part (tok, (char **)0, (int *)0) : find_variable (tok); | |
914 | #else | |
915 | v = find_variable (tok); | |
916 | #endif | |
917 | ||
918 | if ((v == 0 || invisible_p (v)) && unbound_vars_is_error) | |
919 | { | |
920 | #if defined (ARRAY_VARS) | |
921 | value = (e == ']') ? array_variable_name (tok, (char **)0, (int *)0) : tok; | |
922 | #else | |
923 | value = tok; | |
924 | #endif | |
925 | ||
926 | err_unboundvar (value); | |
927 | ||
928 | #if defined (ARRAY_VARS) | |
929 | if (e == ']') | |
930 | FREE (value); /* array_variable_name returns new memory */ | |
931 | #endif | |
932 | ||
933 | if (interactive_shell) | |
934 | { | |
935 | expr_unwind (); | |
c184f645 | 936 | top_level_cleanup (); |
7117c2d2 JA |
937 | jump_to_top_level (DISCARD); |
938 | } | |
939 | else | |
940 | jump_to_top_level (FORCE_EOF); | |
941 | } | |
942 | ||
943 | #if defined (ARRAY_VARS) | |
944 | /* Second argument of 0 to get_array_value means that we don't allow | |
945 | references like array[@]. In this case, get_array_value is just | |
946 | like get_variable_value in that it does not return newly-allocated | |
947 | memory or quote the results. */ | |
948 | value = (e == ']') ? get_array_value (tok, 0, (int *)NULL) : get_variable_value (v); | |
949 | #else | |
950 | value = get_variable_value (v); | |
951 | #endif | |
952 | ||
953 | tval = (value && *value) ? subexpr (value) : 0; | |
954 | ||
955 | return (tval); | |
956 | } | |
957 | ||
dc8fbaf9 CR |
958 | static int |
959 | _is_multiop (c) | |
960 | int c; | |
961 | { | |
962 | switch (c) | |
963 | { | |
964 | case EQEQ: | |
965 | case NEQ: | |
966 | case LEQ: | |
967 | case GEQ: | |
968 | case LAND: | |
969 | case LOR: | |
970 | case LSH: | |
971 | case RSH: | |
972 | case OP_ASSIGN: | |
973 | case COND: | |
974 | case POWER: | |
975 | case PREINC: | |
976 | case PREDEC: | |
977 | case POSTINC: | |
978 | case POSTDEC: | |
979 | return 1; | |
980 | default: | |
981 | return 0; | |
982 | } | |
983 | } | |
984 | ||
985 | static int | |
986 | _is_arithop (c) | |
987 | int c; | |
988 | { | |
989 | switch (c) | |
990 | { | |
991 | case EQ: | |
992 | case GT: | |
993 | case LT: | |
994 | case PLUS: | |
995 | case MINUS: | |
996 | case MUL: | |
997 | case DIV: | |
998 | case MOD: | |
999 | case NOT: | |
1000 | case LPAR: | |
1001 | case RPAR: | |
1002 | case BAND: | |
1003 | case BOR: | |
1004 | case BXOR: | |
1005 | case BNOT: | |
1006 | return 1; /* operator tokens */ | |
1007 | case QUES: | |
1008 | case COL: | |
1009 | case COMMA: | |
1010 | return 1; /* questionable */ | |
1011 | default: | |
1012 | return 0; /* anything else is invalid */ | |
1013 | } | |
1014 | } | |
1015 | ||
726f6388 JA |
1016 | /* Lexical analyzer/token reader for the expression evaluator. Reads the |
1017 | next token and puts its value into curtok, while advancing past it. | |
1018 | Updates value of tp. May also set tokval (for number) or tokstr (for | |
1019 | string). */ | |
1020 | static void | |
1021 | readtok () | |
1022 | { | |
762a763b | 1023 | register char *cp, *xp; |
f73dda09 JA |
1024 | register unsigned char c, c1; |
1025 | register int e; | |
726f6388 JA |
1026 | |
1027 | /* Skip leading whitespace. */ | |
ccc6cda3 JA |
1028 | cp = tp; |
1029 | c = e = 0; | |
726f6388 JA |
1030 | while (cp && (c = *cp) && (cr_whitespace (c))) |
1031 | cp++; | |
1032 | ||
1033 | if (c) | |
1034 | cp++; | |
ccc6cda3 | 1035 | |
726f6388 JA |
1036 | if (c == '\0') |
1037 | { | |
1038 | lasttok = curtok; | |
1039 | curtok = 0; | |
1040 | tp = cp; | |
1041 | return; | |
1042 | } | |
cc12da02 | 1043 | lasttp = tp = cp - 1; |
726f6388 | 1044 | |
ccc6cda3 | 1045 | if (legal_variable_starter (c)) |
726f6388 | 1046 | { |
bb70624e | 1047 | /* variable names not preceded with a dollar sign are shell variables. */ |
7117c2d2 | 1048 | char *savecp; |
bb70624e JA |
1049 | EXPR_CONTEXT ec; |
1050 | int peektok; | |
726f6388 | 1051 | |
ccc6cda3 | 1052 | while (legal_variable_char (c)) |
726f6388 JA |
1053 | c = *cp++; |
1054 | ||
1055 | c = *--cp; | |
ccc6cda3 JA |
1056 | |
1057 | #if defined (ARRAY_VARS) | |
1058 | if (c == '[') | |
1059 | { | |
1060 | e = skipsubscript (cp, 0); | |
1061 | if (cp[e] == ']') | |
1062 | { | |
1063 | cp += e + 1; | |
1064 | c = *cp; | |
1065 | e = ']'; | |
1066 | } | |
1067 | else | |
5e13499c | 1068 | evalerror (bash_badsub_errmsg); |
ccc6cda3 JA |
1069 | } |
1070 | #endif /* ARRAY_VARS */ | |
1071 | ||
726f6388 | 1072 | *cp = '\0'; |
ccc6cda3 | 1073 | FREE (tokstr); |
726f6388 | 1074 | tokstr = savestring (tp); |
bb70624e | 1075 | *cp = c; |
ccc6cda3 | 1076 | |
bb70624e JA |
1077 | SAVETOK (&ec); |
1078 | tokstr = (char *)NULL; /* keep it from being freed */ | |
1079 | tp = savecp = cp; | |
1080 | noeval = 1; | |
762a763b | 1081 | curtok = STR; |
bb70624e JA |
1082 | readtok (); |
1083 | peektok = curtok; | |
1084 | if (peektok == STR) /* free new tokstr before old one is restored */ | |
1085 | FREE (tokstr); | |
1086 | RESTORETOK (&ec); | |
1087 | cp = savecp; | |
1088 | ||
1089 | /* The tests for PREINC and PREDEC aren't strictly correct, but they | |
1090 | preserve old behavior if a construct like --x=9 is given. */ | |
1091 | if (lasttok == PREINC || lasttok == PREDEC || peektok != EQ) | |
7117c2d2 | 1092 | tokval = expr_streval (tokstr, e); |
bb70624e | 1093 | else |
28ef6c31 | 1094 | tokval = 0; |
726f6388 | 1095 | |
726f6388 JA |
1096 | lasttok = curtok; |
1097 | curtok = STR; | |
1098 | } | |
f73dda09 | 1099 | else if (DIGIT(c)) |
726f6388 | 1100 | { |
f73dda09 | 1101 | while (ISALNUM (c) || c == '#' || c == '@' || c == '_') |
726f6388 JA |
1102 | c = *cp++; |
1103 | ||
1104 | c = *--cp; | |
1105 | *cp = '\0'; | |
1106 | ||
1107 | tokval = strlong (tp); | |
1108 | *cp = c; | |
1109 | lasttok = curtok; | |
1110 | curtok = NUM; | |
1111 | } | |
1112 | else | |
1113 | { | |
1114 | c1 = *cp++; | |
ccc6cda3 | 1115 | if ((c == EQ) && (c1 == EQ)) |
726f6388 JA |
1116 | c = EQEQ; |
1117 | else if ((c == NOT) && (c1 == EQ)) | |
1118 | c = NEQ; | |
1119 | else if ((c == GT) && (c1 == EQ)) | |
1120 | c = GEQ; | |
1121 | else if ((c == LT) && (c1 == EQ)) | |
1122 | c = LEQ; | |
1123 | else if ((c == LT) && (c1 == LT)) | |
1124 | { | |
1125 | if (*cp == '=') /* a <<= b */ | |
1126 | { | |
1127 | assigntok = LSH; | |
1128 | c = OP_ASSIGN; | |
1129 | cp++; | |
1130 | } | |
1131 | else | |
1132 | c = LSH; | |
1133 | } | |
1134 | else if ((c == GT) && (c1 == GT)) | |
1135 | { | |
1136 | if (*cp == '=') | |
1137 | { | |
1138 | assigntok = RSH; /* a >>= b */ | |
1139 | c = OP_ASSIGN; | |
1140 | cp++; | |
1141 | } | |
1142 | else | |
1143 | c = RSH; | |
1144 | } | |
1145 | else if ((c == BAND) && (c1 == BAND)) | |
1146 | c = LAND; | |
1147 | else if ((c == BOR) && (c1 == BOR)) | |
1148 | c = LOR; | |
cce855bc | 1149 | else if ((c == '*') && (c1 == '*')) |
28ef6c31 | 1150 | c = POWER; |
762a763b CR |
1151 | else if ((c == '-' || c == '+') && c1 == c && curtok == STR) |
1152 | c = (c == '-') ? POSTDEC : POSTINC; | |
1153 | else if ((c == '-' || c == '+') && c1 == c) | |
1154 | { | |
1155 | /* Quickly scan forward to see if this is followed by optional | |
1156 | whitespace and an identifier. */ | |
1157 | xp = cp; | |
1158 | while (xp && *xp && cr_whitespace (*xp)) | |
1159 | xp++; | |
1160 | if (legal_variable_starter ((unsigned char)*xp)) | |
1161 | c = (c == '-') ? PREDEC : PREINC; | |
1162 | else | |
1163 | cp--; /* not preinc or predec, so unget the character */ | |
1164 | } | |
28ef6c31 | 1165 | else if (c1 == EQ && member (c, "*/%+-&^|")) |
726f6388 JA |
1166 | { |
1167 | assigntok = c; /* a OP= b */ | |
1168 | c = OP_ASSIGN; | |
1169 | } | |
dc8fbaf9 CR |
1170 | else if (_is_arithop (c) == 0) |
1171 | { | |
1172 | cp--; | |
1173 | /* use curtok, since it hasn't been copied to lasttok yet */ | |
1174 | if (curtok == 0 || _is_arithop (curtok) || _is_multiop (curtok)) | |
1175 | evalerror (_("syntax error: operand expected")); | |
1176 | else | |
1177 | evalerror (_("syntax error: invalid arithmetic operator")); | |
1178 | } | |
726f6388 JA |
1179 | else |
1180 | cp--; /* `unget' the character */ | |
dc8fbaf9 CR |
1181 | |
1182 | /* Should check here to make sure that the current character is one | |
1183 | of the recognized operators and flag an error if not. Could create | |
1184 | a character map the first time through and check it on subsequent | |
1185 | calls. */ | |
726f6388 JA |
1186 | lasttok = curtok; |
1187 | curtok = c; | |
1188 | } | |
1189 | tp = cp; | |
1190 | } | |
1191 | ||
1192 | static void | |
1193 | evalerror (msg) | |
d3ad40de | 1194 | const char *msg; |
726f6388 JA |
1195 | { |
1196 | char *name, *t; | |
1197 | ||
1198 | name = this_command_name; | |
726f6388 JA |
1199 | for (t = expression; whitespace (*t); t++) |
1200 | ; | |
d3ad40de | 1201 | internal_error (_("%s%s%s: %s (error token is \"%s\")"), |
ccc6cda3 JA |
1202 | name ? name : "", name ? ": " : "", t, |
1203 | msg, (lasttp && *lasttp) ? lasttp : ""); | |
726f6388 JA |
1204 | longjmp (evalbuf, 1); |
1205 | } | |
1206 | ||
7117c2d2 | 1207 | /* Convert a string to an intmax_t integer, with an arbitrary base. |
726f6388 | 1208 | 0nnn -> base 8 |
cce855bc | 1209 | 0[Xx]nn -> base 16 |
ccc6cda3 JA |
1210 | Anything else: [base#]number (this is implemented to match ksh93) |
1211 | ||
1212 | Base may be >=2 and <=64. If base is <= 36, the numbers are drawn | |
1213 | from [0-9][a-zA-Z], and lowercase and uppercase letters may be used | |
1214 | interchangably. If base is > 36 and <= 64, the numbers are drawn | |
2206f89a | 1215 | from [0-9][a-z][A-Z]_@ (a = 10, z = 35, A = 36, Z = 61, @ = 62, _ = 63 -- |
ccc6cda3 JA |
1216 | you get the picture). */ |
1217 | ||
7117c2d2 | 1218 | static intmax_t |
726f6388 JA |
1219 | strlong (num) |
1220 | char *num; | |
1221 | { | |
ccc6cda3 | 1222 | register char *s; |
f73dda09 | 1223 | register unsigned char c; |
ccc6cda3 | 1224 | int base, foundbase; |
7117c2d2 | 1225 | intmax_t val; |
726f6388 | 1226 | |
ccc6cda3 | 1227 | s = num; |
726f6388 | 1228 | |
ccc6cda3 JA |
1229 | base = 10; |
1230 | foundbase = 0; | |
726f6388 JA |
1231 | if (*s == '0') |
1232 | { | |
1233 | s++; | |
1234 | ||
f73dda09 JA |
1235 | if (*s == '\0') |
1236 | return 0; | |
ccc6cda3 | 1237 | |
726f6388 JA |
1238 | /* Base 16? */ |
1239 | if (*s == 'x' || *s == 'X') | |
1240 | { | |
1241 | base = 16; | |
1242 | s++; | |
1243 | } | |
1244 | else | |
1245 | base = 8; | |
ccc6cda3 | 1246 | foundbase++; |
726f6388 JA |
1247 | } |
1248 | ||
f73dda09 | 1249 | val = 0; |
726f6388 JA |
1250 | for (c = *s++; c; c = *s++) |
1251 | { | |
1252 | if (c == '#') | |
1253 | { | |
ccc6cda3 | 1254 | if (foundbase) |
5e13499c | 1255 | evalerror (_("invalid number")); |
ccc6cda3 | 1256 | |
ccc6cda3 | 1257 | /* Illegal base specifications raise an evaluation error. */ |
f73dda09 | 1258 | if (val < 2 || val > 64) |
5e13499c | 1259 | evalerror (_("invalid arithmetic base")); |
726f6388 | 1260 | |
f73dda09 JA |
1261 | base = val; |
1262 | val = 0; | |
ccc6cda3 JA |
1263 | foundbase++; |
1264 | } | |
f73dda09 | 1265 | else if (ISALNUM(c) || (c == '_') || (c == '@')) |
ccc6cda3 | 1266 | { |
f73dda09 JA |
1267 | if (DIGIT(c)) |
1268 | c = TODIGIT(c); | |
ccc6cda3 JA |
1269 | else if (c >= 'a' && c <= 'z') |
1270 | c -= 'a' - 10; | |
1271 | else if (c >= 'A' && c <= 'Z') | |
1272 | c -= 'A' - ((base <= 36) ? 10 : 36); | |
ccc6cda3 | 1273 | else if (c == '@') |
f73dda09 JA |
1274 | c = 62; |
1275 | else if (c == '_') | |
ccc6cda3 JA |
1276 | c = 63; |
1277 | ||
1278 | if (c >= base) | |
5e13499c | 1279 | evalerror (_("value too great for base")); |
ccc6cda3 JA |
1280 | |
1281 | val = (val * base) + c; | |
726f6388 JA |
1282 | } |
1283 | else | |
ccc6cda3 | 1284 | break; |
726f6388 | 1285 | } |
2206f89a | 1286 | |
726f6388 JA |
1287 | return (val); |
1288 | } | |
1289 | ||
1290 | #if defined (EXPR_TEST) | |
f73dda09 | 1291 | void * |
726f6388 JA |
1292 | xmalloc (n) |
1293 | int n; | |
1294 | { | |
1295 | return (malloc (n)); | |
1296 | } | |
1297 | ||
f73dda09 | 1298 | void * |
726f6388 JA |
1299 | xrealloc (s, n) |
1300 | char *s; | |
1301 | int n; | |
1302 | { | |
1303 | return (realloc (s, n)); | |
1304 | } | |
1305 | ||
1306 | SHELL_VAR *find_variable () { return 0;} | |
1307 | SHELL_VAR *bind_variable () { return 0; } | |
1308 | ||
1309 | char *get_string_value () { return 0; } | |
1310 | ||
ccc6cda3 | 1311 | procenv_t top_level; |
726f6388 JA |
1312 | |
1313 | main (argc, argv) | |
1314 | int argc; | |
1315 | char **argv; | |
1316 | { | |
1317 | register int i; | |
7117c2d2 | 1318 | intmax_t v; |
d166f048 | 1319 | int expok; |
726f6388 JA |
1320 | |
1321 | if (setjmp (top_level)) | |
1322 | exit (0); | |
1323 | ||
1324 | for (i = 1; i < argc; i++) | |
1325 | { | |
d166f048 JA |
1326 | v = evalexp (argv[i], &expok); |
1327 | if (expok == 0) | |
d3ad40de | 1328 | fprintf (stderr, _("%s: expression error\n"), argv[i]); |
d166f048 | 1329 | else |
28ef6c31 | 1330 | printf ("'%s' -> %ld\n", argv[i], v); |
726f6388 JA |
1331 | } |
1332 | exit (0); | |
1333 | } | |
1334 | ||
1335 | int | |
1336 | builtin_error (format, arg1, arg2, arg3, arg4, arg5) | |
1337 | char *format; | |
1338 | { | |
1339 | fprintf (stderr, "expr: "); | |
1340 | fprintf (stderr, format, arg1, arg2, arg3, arg4, arg5); | |
1341 | fprintf (stderr, "\n"); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | char * | |
1346 | itos (n) | |
7117c2d2 | 1347 | intmax_t n; |
726f6388 JA |
1348 | { |
1349 | return ("42"); | |
1350 | } | |
1351 | ||
1352 | #endif /* EXPR_TEST */ |