Commit | Line | Data |
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8c4ebc23 JH |
1 | /* |
2 | * io.c --- routines for dealing with input and output and records | |
3 | */ | |
4 | ||
5 | /* | |
6 | * Copyright (C) 1986, 1988, 1989, 1991, 1992 the Free Software Foundation, Inc. | |
7 | * | |
8 | * This file is part of GAWK, the GNU implementation of the | |
9 | * AWK Progamming Language. | |
10 | * | |
11 | * GAWK is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * GAWK is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with GAWK; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | #include "awk.h" | |
27 | ||
28 | #ifndef O_RDONLY | |
29 | #include <fcntl.h> | |
30 | #endif | |
31 | ||
32 | #if !defined(S_ISDIR) && defined(S_IFDIR) | |
33 | #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) | |
34 | #endif | |
35 | ||
36 | #ifndef atarist | |
37 | #define INVALID_HANDLE (-1) | |
38 | #else | |
39 | #define INVALID_HANDLE (__SMALLEST_VALID_HANDLE - 1) | |
40 | #endif | |
41 | ||
42 | #if defined(MSDOS) || defined(atarist) | |
43 | #define PIPES_SIMULATED | |
44 | #endif | |
45 | ||
46 | static IOBUF *nextfile P((int skipping)); | |
47 | static int inrec P((IOBUF *iop)); | |
48 | static int iop_close P((IOBUF *iop)); | |
49 | struct redirect *redirect P((NODE *tree, int *errflg)); | |
50 | static void close_one P((void)); | |
51 | static int close_redir P((struct redirect *rp)); | |
52 | #ifndef PIPES_SIMULATED | |
53 | static int wait_any P((int interesting)); | |
54 | #endif | |
55 | static IOBUF *gawk_popen P((char *cmd, struct redirect *rp)); | |
56 | static IOBUF *iop_open P((char *file, char *how)); | |
57 | static int gawk_pclose P((struct redirect *rp)); | |
58 | static int do_pathopen P((char *file)); | |
59 | ||
60 | extern FILE *fdopen(); | |
61 | extern FILE *popen(); | |
62 | ||
63 | static struct redirect *red_head = NULL; | |
64 | ||
65 | extern int output_is_tty; | |
66 | extern NODE *ARGC_node; | |
67 | extern NODE *ARGV_node; | |
68 | extern NODE *ARGIND_node; | |
69 | extern NODE *ERRNO_node; | |
70 | extern NODE **fields_arr; | |
71 | ||
72 | static jmp_buf filebuf; /* for do_nextfile() */ | |
73 | ||
74 | /* do_nextfile --- implement gawk "next file" extension */ | |
75 | ||
76 | void | |
77 | do_nextfile() | |
78 | { | |
79 | (void) nextfile(1); | |
80 | longjmp(filebuf, 1); | |
81 | } | |
82 | ||
83 | static IOBUF * | |
84 | nextfile(skipping) | |
85 | int skipping; | |
86 | { | |
87 | static int i = 1; | |
88 | static int files = 0; | |
89 | NODE *arg; | |
90 | int fd = INVALID_HANDLE; | |
91 | static IOBUF *curfile = NULL; | |
92 | ||
93 | if (skipping) { | |
94 | if (curfile != NULL) | |
95 | iop_close(curfile); | |
96 | curfile = NULL; | |
97 | return NULL; | |
98 | } | |
99 | if (curfile != NULL) { | |
100 | if (curfile->cnt == EOF) { | |
101 | (void) iop_close(curfile); | |
102 | curfile = NULL; | |
103 | } else | |
104 | return curfile; | |
105 | } | |
106 | for (; i < (int) (ARGC_node->lnode->numbr); i++) { | |
107 | arg = *assoc_lookup(ARGV_node, tmp_number((AWKNUM) i)); | |
108 | if (arg->stptr[0] == '\0') | |
109 | continue; | |
110 | arg->stptr[arg->stlen] = '\0'; | |
111 | if (! do_unix) { | |
112 | ARGIND_node->var_value->numbr = i; | |
113 | ARGIND_node->var_value->flags = NUM|NUMBER; | |
114 | } | |
115 | if (!arg_assign(arg->stptr)) { | |
116 | files++; | |
117 | curfile = iop_open(arg->stptr, "r"); | |
118 | if (curfile == NULL) | |
119 | fatal("cannot open file `%s' for reading (%s)", | |
120 | arg->stptr, strerror(errno)); | |
121 | /* NOTREACHED */ | |
122 | /* This is a kludge. */ | |
123 | unref(FILENAME_node->var_value); | |
124 | FILENAME_node->var_value = | |
125 | dupnode(arg); | |
126 | FNR = 0; | |
127 | i++; | |
128 | break; | |
129 | } | |
130 | } | |
131 | if (files == 0) { | |
132 | files++; | |
133 | /* no args. -- use stdin */ | |
134 | /* FILENAME is init'ed to "-" */ | |
135 | /* FNR is init'ed to 0 */ | |
136 | curfile = iop_alloc(fileno(stdin)); | |
137 | } | |
138 | return curfile; | |
139 | } | |
140 | ||
141 | void | |
142 | set_FNR() | |
143 | { | |
144 | FNR = (int) FNR_node->var_value->numbr; | |
145 | } | |
146 | ||
147 | void | |
148 | set_NR() | |
149 | { | |
150 | NR = (int) NR_node->var_value->numbr; | |
151 | } | |
152 | ||
153 | /* | |
154 | * This reads in a record from the input file | |
155 | */ | |
156 | static int | |
157 | inrec(iop) | |
158 | IOBUF *iop; | |
159 | { | |
160 | char *begin; | |
161 | register int cnt; | |
162 | int retval = 0; | |
163 | ||
164 | cnt = get_a_record(&begin, iop, *RS, NULL); | |
165 | if (cnt == EOF) { | |
166 | cnt = 0; | |
167 | retval = 1; | |
168 | } else { | |
169 | NR += 1; | |
170 | FNR += 1; | |
171 | } | |
172 | set_record(begin, cnt, 1); | |
173 | ||
174 | return retval; | |
175 | } | |
176 | ||
177 | static int | |
178 | iop_close(iop) | |
179 | IOBUF *iop; | |
180 | { | |
181 | int ret; | |
182 | ||
183 | if (iop == NULL) | |
184 | return 0; | |
185 | errno = 0; | |
186 | ||
187 | #ifdef _CRAY | |
188 | /* Work around bug in UNICOS popen */ | |
189 | if (iop->fd < 3) | |
190 | ret = 0; | |
191 | else | |
192 | #endif | |
193 | /* save these for re-use; don't free the storage */ | |
194 | if ((iop->flag & IOP_IS_INTERNAL) != 0) { | |
195 | iop->off = iop->buf; | |
196 | iop->end = iop->buf + strlen(iop->buf); | |
197 | iop->cnt = 0; | |
198 | iop->secsiz = 0; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Don't close standard files or else crufty code elsewhere will lose */ | |
203 | if (iop->fd == fileno(stdin) || | |
204 | iop->fd == fileno(stdout) || | |
205 | iop->fd == fileno(stderr)) | |
206 | ret = 0; | |
207 | else | |
208 | ret = close(iop->fd); | |
209 | if (ret == -1) | |
210 | warning("close of fd %d failed (%s)", iop->fd, strerror(errno)); | |
211 | if ((iop->flag & IOP_NO_FREE) == 0) { | |
212 | /* | |
213 | * be careful -- $0 may still reference the buffer even though | |
214 | * an explicit close is being done; in the future, maybe we | |
215 | * can do this a bit better | |
216 | */ | |
217 | if (iop->buf) { | |
218 | if ((fields_arr[0]->stptr >= iop->buf) | |
219 | && (fields_arr[0]->stptr < iop->end)) { | |
220 | NODE *t; | |
221 | ||
222 | t = make_string(fields_arr[0]->stptr, | |
223 | fields_arr[0]->stlen); | |
224 | unref(fields_arr[0]); | |
225 | fields_arr [0] = t; | |
226 | reset_record (); | |
227 | } | |
228 | free(iop->buf); | |
229 | } | |
230 | free((char *)iop); | |
231 | } | |
232 | return ret == -1 ? 1 : 0; | |
233 | } | |
234 | ||
235 | void | |
236 | do_input() | |
237 | { | |
238 | IOBUF *iop; | |
239 | extern int exiting; | |
240 | ||
241 | if (setjmp(filebuf) != 0) { | |
242 | } | |
243 | while ((iop = nextfile(0)) != NULL) { | |
244 | if (inrec(iop) == 0) | |
245 | while (interpret(expression_value) && inrec(iop) == 0) | |
246 | ; | |
247 | if (exiting) | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
252 | /* Redirection for printf and print commands */ | |
253 | struct redirect * | |
254 | redirect(tree, errflg) | |
255 | NODE *tree; | |
256 | int *errflg; | |
257 | { | |
258 | register NODE *tmp; | |
259 | register struct redirect *rp; | |
260 | register char *str; | |
261 | int tflag = 0; | |
262 | int outflag = 0; | |
263 | char *direction = "to"; | |
264 | char *mode; | |
265 | int fd; | |
266 | char *what = NULL; | |
267 | ||
268 | switch (tree->type) { | |
269 | case Node_redirect_append: | |
270 | tflag = RED_APPEND; | |
271 | /* FALL THROUGH */ | |
272 | case Node_redirect_output: | |
273 | outflag = (RED_FILE|RED_WRITE); | |
274 | tflag |= outflag; | |
275 | if (tree->type == Node_redirect_output) | |
276 | what = ">"; | |
277 | else | |
278 | what = ">>"; | |
279 | break; | |
280 | case Node_redirect_pipe: | |
281 | tflag = (RED_PIPE|RED_WRITE); | |
282 | what = "|"; | |
283 | break; | |
284 | case Node_redirect_pipein: | |
285 | tflag = (RED_PIPE|RED_READ); | |
286 | what = "|"; | |
287 | break; | |
288 | case Node_redirect_input: | |
289 | tflag = (RED_FILE|RED_READ); | |
290 | what = "<"; | |
291 | break; | |
292 | default: | |
293 | fatal ("invalid tree type %d in redirect()", tree->type); | |
294 | break; | |
295 | } | |
296 | tmp = tree_eval(tree->subnode); | |
297 | if (do_lint && ! (tmp->flags & STR)) | |
298 | warning("expression in `%s' redirection only has numeric value", | |
299 | what); | |
300 | tmp = force_string(tmp); | |
301 | str = tmp->stptr; | |
302 | if (str == NULL || *str == '\0') | |
303 | fatal("expression for `%s' redirection has null string value", | |
304 | what); | |
305 | if (do_lint | |
306 | && (STREQN(str, "0", tmp->stlen) || STREQN(str, "1", tmp->stlen))) | |
307 | warning("filename `%s' for `%s' redirection may be result of logical expression", str, what); | |
308 | for (rp = red_head; rp != NULL; rp = rp->next) | |
309 | if (strlen(rp->value) == tmp->stlen | |
310 | && STREQN(rp->value, str, tmp->stlen) | |
311 | && ((rp->flag & ~(RED_NOBUF|RED_EOF)) == tflag | |
312 | || (outflag | |
313 | && (rp->flag & (RED_FILE|RED_WRITE)) == outflag))) | |
314 | break; | |
315 | if (rp == NULL) { | |
316 | emalloc(rp, struct redirect *, sizeof(struct redirect), | |
317 | "redirect"); | |
318 | emalloc(str, char *, tmp->stlen+1, "redirect"); | |
319 | memcpy(str, tmp->stptr, tmp->stlen); | |
320 | str[tmp->stlen] = '\0'; | |
321 | rp->value = str; | |
322 | rp->flag = tflag; | |
323 | rp->fp = NULL; | |
324 | rp->iop = NULL; | |
325 | rp->pid = 0; /* unlikely that we're worried about init */ | |
326 | rp->status = 0; | |
327 | /* maintain list in most-recently-used first order */ | |
328 | if (red_head) | |
329 | red_head->prev = rp; | |
330 | rp->prev = NULL; | |
331 | rp->next = red_head; | |
332 | red_head = rp; | |
333 | } | |
334 | while (rp->fp == NULL && rp->iop == NULL) { | |
335 | if (rp->flag & RED_EOF) | |
336 | /* encountered EOF on file or pipe -- must be cleared | |
337 | * by explicit close() before reading more | |
338 | */ | |
339 | return rp; | |
340 | mode = NULL; | |
341 | errno = 0; | |
342 | switch (tree->type) { | |
343 | case Node_redirect_output: | |
344 | mode = "w"; | |
345 | if (rp->flag & RED_USED) | |
346 | mode = "a"; | |
347 | break; | |
348 | case Node_redirect_append: | |
349 | mode = "a"; | |
350 | break; | |
351 | case Node_redirect_pipe: | |
352 | if ((rp->fp = popen(str, "w")) == NULL) | |
353 | fatal("can't open pipe (\"%s\") for output (%s)", | |
354 | str, strerror(errno)); | |
355 | rp->flag |= RED_NOBUF; | |
356 | break; | |
357 | case Node_redirect_pipein: | |
358 | direction = "from"; | |
359 | if (gawk_popen(str, rp) == NULL) | |
360 | fatal("can't open pipe (\"%s\") for input (%s)", | |
361 | str, strerror(errno)); | |
362 | break; | |
363 | case Node_redirect_input: | |
364 | direction = "from"; | |
365 | rp->iop = iop_open(str, "r"); | |
366 | break; | |
367 | default: | |
368 | cant_happen(); | |
369 | } | |
370 | if (mode != NULL) { | |
371 | fd = devopen(str, mode); | |
372 | if (fd > INVALID_HANDLE) { | |
373 | if (fd == fileno(stdin)) | |
374 | rp->fp = stdin; | |
375 | else if (fd == fileno(stdout)) | |
376 | rp->fp = stdout; | |
377 | else if (fd == fileno(stderr)) | |
378 | rp->fp = stderr; | |
379 | else | |
380 | rp->fp = fdopen(fd, mode); | |
381 | if (isatty(fd)) | |
382 | rp->flag |= RED_NOBUF; | |
383 | } | |
384 | } | |
385 | if (rp->fp == NULL && rp->iop == NULL) { | |
386 | /* too many files open -- close one and try again */ | |
387 | if (errno == EMFILE) | |
388 | close_one(); | |
389 | else { | |
390 | /* | |
391 | * Some other reason for failure. | |
392 | * | |
393 | * On redirection of input from a file, | |
394 | * just return an error, so e.g. getline | |
395 | * can return -1. For output to file, | |
396 | * complain. The shell will complain on | |
397 | * a bad command to a pipe. | |
398 | */ | |
399 | *errflg = errno; | |
400 | if (tree->type == Node_redirect_output | |
401 | || tree->type == Node_redirect_append) | |
402 | fatal("can't redirect %s `%s' (%s)", | |
403 | direction, str, strerror(errno)); | |
404 | else { | |
405 | free_temp(tmp); | |
406 | return NULL; | |
407 | } | |
408 | } | |
409 | } | |
410 | } | |
411 | free_temp(tmp); | |
412 | return rp; | |
413 | } | |
414 | ||
415 | static void | |
416 | close_one() | |
417 | { | |
418 | register struct redirect *rp; | |
419 | register struct redirect *rplast = NULL; | |
420 | ||
421 | /* go to end of list first, to pick up least recently used entry */ | |
422 | for (rp = red_head; rp != NULL; rp = rp->next) | |
423 | rplast = rp; | |
424 | /* now work back up through the list */ | |
425 | for (rp = rplast; rp != NULL; rp = rp->prev) | |
426 | if (rp->fp && (rp->flag & RED_FILE)) { | |
427 | rp->flag |= RED_USED; | |
428 | errno = 0; | |
429 | if (fclose(rp->fp)) | |
430 | warning("close of \"%s\" failed (%s).", | |
431 | rp->value, strerror(errno)); | |
432 | rp->fp = NULL; | |
433 | break; | |
434 | } | |
435 | if (rp == NULL) | |
436 | /* surely this is the only reason ??? */ | |
437 | fatal("too many pipes or input files open"); | |
438 | } | |
439 | ||
440 | NODE * | |
441 | do_close(tree) | |
442 | NODE *tree; | |
443 | { | |
444 | NODE *tmp; | |
445 | register struct redirect *rp; | |
446 | ||
447 | tmp = force_string(tree_eval(tree->subnode)); | |
448 | for (rp = red_head; rp != NULL; rp = rp->next) { | |
449 | if (strlen(rp->value) == tmp->stlen | |
450 | && STREQN(rp->value, tmp->stptr, tmp->stlen)) | |
451 | break; | |
452 | } | |
453 | free_temp(tmp); | |
454 | if (rp == NULL) /* no match */ | |
455 | return tmp_number((AWKNUM) 0.0); | |
456 | fflush(stdout); /* synchronize regular output */ | |
457 | tmp = tmp_number((AWKNUM)close_redir(rp)); | |
458 | rp = NULL; | |
459 | return tmp; | |
460 | } | |
461 | ||
462 | static int | |
463 | close_redir(rp) | |
464 | register struct redirect *rp; | |
465 | { | |
466 | int status = 0; | |
467 | ||
468 | if (rp == NULL) | |
469 | return 0; | |
470 | if (rp->fp == stdout || rp->fp == stderr) | |
471 | return 0; | |
472 | errno = 0; | |
473 | if ((rp->flag & (RED_PIPE|RED_WRITE)) == (RED_PIPE|RED_WRITE)) | |
474 | status = pclose(rp->fp); | |
475 | else if (rp->fp) | |
476 | status = fclose(rp->fp); | |
477 | else if (rp->iop) { | |
478 | if (rp->flag & RED_PIPE) | |
479 | status = gawk_pclose(rp); | |
480 | else { | |
481 | status = iop_close(rp->iop); | |
482 | rp->iop = NULL; | |
483 | } | |
484 | } | |
485 | /* SVR4 awk checks and warns about status of close */ | |
486 | if (status) { | |
487 | char *s = strerror(errno); | |
488 | ||
489 | warning("failure status (%d) on %s close of \"%s\" (%s).", | |
490 | status, | |
491 | (rp->flag & RED_PIPE) ? "pipe" : | |
492 | "file", rp->value, s); | |
493 | ||
494 | if (! do_unix) { | |
495 | /* set ERRNO too so that program can get at it */ | |
496 | unref(ERRNO_node->var_value); | |
497 | ERRNO_node->var_value = make_string(s, strlen(s)); | |
498 | } | |
499 | } | |
500 | if (rp->next) | |
501 | rp->next->prev = rp->prev; | |
502 | if (rp->prev) | |
503 | rp->prev->next = rp->next; | |
504 | else | |
505 | red_head = rp->next; | |
506 | free(rp->value); | |
507 | free((char *)rp); | |
508 | return status; | |
509 | } | |
510 | ||
511 | int | |
512 | flush_io () | |
513 | { | |
514 | register struct redirect *rp; | |
515 | int status = 0; | |
516 | ||
517 | errno = 0; | |
518 | if (fflush(stdout)) { | |
519 | warning("error writing standard output (%s).", strerror(errno)); | |
520 | status++; | |
521 | } | |
522 | if (fflush(stderr)) { | |
523 | warning("error writing standard error (%s).", strerror(errno)); | |
524 | status++; | |
525 | } | |
526 | for (rp = red_head; rp != NULL; rp = rp->next) | |
527 | /* flush both files and pipes, what the heck */ | |
528 | if ((rp->flag & RED_WRITE) && rp->fp != NULL) { | |
529 | if (fflush(rp->fp)) { | |
530 | warning("%s flush of \"%s\" failed (%s).", | |
531 | (rp->flag & RED_PIPE) ? "pipe" : | |
532 | "file", rp->value, strerror(errno)); | |
533 | status++; | |
534 | } | |
535 | } | |
536 | return status; | |
537 | } | |
538 | ||
539 | int | |
540 | close_io () | |
541 | { | |
542 | register struct redirect *rp; | |
543 | register struct redirect *next; | |
544 | int status = 0; | |
545 | ||
546 | errno = 0; | |
547 | if (fclose(stdout)) { | |
548 | warning("error writing standard output (%s).", strerror(errno)); | |
549 | status++; | |
550 | } | |
551 | if (fclose(stderr)) { | |
552 | warning("error writing standard error (%s).", strerror(errno)); | |
553 | status++; | |
554 | } | |
555 | for (rp = red_head; rp != NULL; rp = next) { | |
556 | next = rp->next; | |
557 | if (close_redir(rp)) | |
558 | status++; | |
559 | rp = NULL; | |
560 | } | |
561 | return status; | |
562 | } | |
563 | ||
564 | /* str2mode --- convert a string mode to an integer mode */ | |
565 | ||
566 | static int | |
567 | str2mode(mode) | |
568 | char *mode; | |
569 | { | |
570 | int ret; | |
571 | ||
572 | switch(mode[0]) { | |
573 | case 'r': | |
574 | ret = O_RDONLY; | |
575 | break; | |
576 | ||
577 | case 'w': | |
578 | ret = O_WRONLY|O_CREAT|O_TRUNC; | |
579 | break; | |
580 | ||
581 | case 'a': | |
582 | ret = O_WRONLY|O_APPEND|O_CREAT; | |
583 | break; | |
584 | default: | |
585 | cant_happen(); | |
586 | } | |
587 | return ret; | |
588 | } | |
589 | ||
590 | /* devopen --- handle /dev/std{in,out,err}, /dev/fd/N, regular files */ | |
591 | ||
592 | /* | |
593 | * This separate version is still needed for output, since file and pipe | |
594 | * output is done with stdio. iop_open() handles input with IOBUFs of | |
595 | * more "special" files. Those files are not handled here since it makes | |
596 | * no sense to use them for output. | |
597 | */ | |
598 | ||
599 | int | |
600 | devopen(name, mode) | |
601 | char *name, *mode; | |
602 | { | |
603 | int openfd = INVALID_HANDLE; | |
604 | char *cp, *ptr; | |
605 | int flag = 0; | |
606 | struct stat buf; | |
607 | extern double strtod(); | |
608 | ||
609 | flag = str2mode(mode); | |
610 | ||
611 | if (do_unix) | |
612 | goto strictopen; | |
613 | ||
614 | #ifdef VMS | |
615 | if ((openfd = vms_devopen(name, flag)) >= 0) | |
616 | return openfd; | |
617 | #endif /* VMS */ | |
618 | ||
619 | if (STREQ(name, "-")) | |
620 | openfd = fileno(stdin); | |
621 | else if (STREQN(name, "/dev/", 5) && stat(name, &buf) == -1) { | |
622 | cp = name + 5; | |
623 | ||
624 | if (STREQ(cp, "stdin") && (flag & O_RDONLY) == O_RDONLY) | |
625 | openfd = fileno(stdin); | |
626 | else if (STREQ(cp, "stdout") && (flag & O_WRONLY) == O_WRONLY) | |
627 | openfd = fileno(stdout); | |
628 | else if (STREQ(cp, "stderr") && (flag & O_WRONLY) == O_WRONLY) | |
629 | openfd = fileno(stderr); | |
630 | else if (STREQN(cp, "fd/", 3)) { | |
631 | cp += 3; | |
632 | openfd = (int)strtod(cp, &ptr); | |
633 | if (openfd <= INVALID_HANDLE || ptr == cp) | |
634 | openfd = INVALID_HANDLE; | |
635 | } | |
636 | } | |
637 | ||
638 | strictopen: | |
639 | if (openfd == INVALID_HANDLE) | |
640 | openfd = open(name, flag, 0666); | |
641 | if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0) | |
642 | if (S_ISDIR(buf.st_mode)) | |
643 | fatal("file `%s' is a directory", name); | |
644 | return openfd; | |
645 | } | |
646 | ||
647 | ||
648 | /* spec_setup --- setup an IOBUF for a special internal file */ | |
649 | ||
650 | void | |
651 | spec_setup(iop, len, allocate) | |
652 | IOBUF *iop; | |
653 | int len; | |
654 | int allocate; | |
655 | { | |
656 | char *cp; | |
657 | ||
658 | if (allocate) { | |
659 | emalloc(cp, char *, len+2, "spec_setup"); | |
660 | iop->buf = cp; | |
661 | } else { | |
662 | len = strlen(iop->buf); | |
663 | iop->buf[len++] = '\n'; /* get_a_record clobbered it */ | |
664 | iop->buf[len] = '\0'; /* just in case */ | |
665 | } | |
666 | iop->off = iop->buf; | |
667 | iop->cnt = 0; | |
668 | iop->secsiz = 0; | |
669 | iop->size = len; | |
670 | iop->end = iop->buf + len; | |
671 | iop->fd = -1; | |
672 | iop->flag = IOP_IS_INTERNAL; | |
673 | } | |
674 | ||
675 | /* specfdopen --- open a fd special file */ | |
676 | ||
677 | int | |
678 | specfdopen(iop, name, mode) | |
679 | IOBUF *iop; | |
680 | char *name, *mode; | |
681 | { | |
682 | int fd; | |
683 | IOBUF *tp; | |
684 | ||
685 | fd = devopen(name, mode); | |
686 | if (fd == INVALID_HANDLE) | |
687 | return INVALID_HANDLE; | |
688 | tp = iop_alloc(fd); | |
689 | if (tp == NULL) | |
690 | return INVALID_HANDLE; | |
691 | *iop = *tp; | |
692 | iop->flag |= IOP_NO_FREE; | |
693 | free(tp); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | /* pidopen --- "open" /dev/pid, /dev/ppid, and /dev/pgrpid */ | |
698 | ||
699 | int | |
700 | pidopen(iop, name, mode) | |
701 | IOBUF *iop; | |
702 | char *name, *mode; | |
703 | { | |
704 | char tbuf[BUFSIZ]; | |
705 | int i; | |
706 | ||
707 | if (name[6] == 'g') | |
708 | /* following #if will improve in 2.16 */ | |
709 | #if defined(__svr4__) || defined(i860) || defined(_AIX) || defined(BSD4_4) || defined(__386BSD__) | |
710 | sprintf(tbuf, "%d\n", getpgrp()); | |
711 | #else | |
712 | sprintf(tbuf, "%d\n", getpgrp(getpid())); | |
713 | #endif | |
714 | else if (name[6] == 'i') | |
715 | sprintf(tbuf, "%d\n", getpid()); | |
716 | else | |
717 | sprintf(tbuf, "%d\n", getppid()); | |
718 | i = strlen(tbuf); | |
719 | spec_setup(iop, i, 1); | |
720 | strcpy(iop->buf, tbuf); | |
721 | return 0; | |
722 | } | |
723 | ||
724 | /* useropen --- "open" /dev/user */ | |
725 | ||
726 | /* | |
727 | * /dev/user creates a record as follows: | |
728 | * $1 = getuid() | |
729 | * $2 = geteuid() | |
730 | * $3 = getgid() | |
731 | * $4 = getegid() | |
732 | * If multiple groups are supported, the $5 through $NF are the | |
733 | * supplementary group set. | |
734 | */ | |
735 | ||
736 | int | |
737 | useropen(iop, name, mode) | |
738 | IOBUF *iop; | |
739 | char *name, *mode; | |
740 | { | |
741 | char tbuf[BUFSIZ], *cp; | |
742 | int i; | |
743 | #if defined(NGROUPS_MAX) && NGROUPS_MAX > 0 | |
744 | int groupset[NGROUPS_MAX]; | |
745 | int ngroups; | |
746 | #endif | |
747 | ||
748 | sprintf(tbuf, "%d %d %d %d", getuid(), geteuid(), getgid(), getegid()); | |
749 | ||
750 | cp = tbuf + strlen(tbuf); | |
751 | #if defined(NGROUPS_MAX) && NGROUPS_MAX > 0 | |
752 | ngroups = getgroups(NGROUPS_MAX, groupset); | |
753 | if (ngroups == -1) | |
754 | fatal("could not find groups: %s", strerror(errno)); | |
755 | ||
756 | for (i = 0; i < ngroups; i++) { | |
757 | *cp++ = ' '; | |
758 | sprintf(cp, "%d", groupset[i]); | |
759 | cp += strlen(cp); | |
760 | } | |
761 | #endif | |
762 | *cp++ = '\n'; | |
763 | *cp++ = '\0'; | |
764 | ||
765 | ||
766 | i = strlen(tbuf); | |
767 | spec_setup(iop, i, 1); | |
768 | strcpy(iop->buf, tbuf); | |
769 | return 0; | |
770 | } | |
771 | ||
772 | /* iop_open --- handle special and regular files for input */ | |
773 | ||
774 | static IOBUF * | |
775 | iop_open(name, mode) | |
776 | char *name, *mode; | |
777 | { | |
778 | int openfd = INVALID_HANDLE; | |
779 | char *cp, *ptr; | |
780 | int flag = 0; | |
781 | int i; | |
782 | struct stat buf; | |
783 | IOBUF *iop; | |
784 | static struct internal { | |
785 | char *name; | |
786 | int compare; | |
787 | int (*fp)(); | |
788 | IOBUF iob; | |
789 | } table[] = { | |
790 | { "/dev/fd/", 8, specfdopen }, | |
791 | { "/dev/stdin", 10, specfdopen }, | |
792 | { "/dev/stdout", 11, specfdopen }, | |
793 | { "/dev/stderr", 11, specfdopen }, | |
794 | { "/dev/pid", 8, pidopen }, | |
795 | { "/dev/ppid", 9, pidopen }, | |
796 | { "/dev/pgrpid", 11, pidopen }, | |
797 | { "/dev/user", 9, useropen }, | |
798 | }; | |
799 | int devcount = sizeof(table) / sizeof(table[0]); | |
800 | ||
801 | flag = str2mode(mode); | |
802 | ||
803 | if (do_unix) | |
804 | goto strictopen; | |
805 | ||
806 | if (STREQ(name, "-")) | |
807 | openfd = fileno(stdin); | |
808 | else if (STREQN(name, "/dev/", 5) && stat(name, &buf) == -1) { | |
809 | int i; | |
810 | ||
811 | for (i = 0; i < devcount; i++) { | |
812 | if (STREQN(name, table[i].name, table[i].compare)) { | |
813 | IOBUF *iop = & table[i].iob; | |
814 | ||
815 | if (iop->buf != NULL) { | |
816 | spec_setup(iop, 0, 0); | |
817 | return iop; | |
818 | } else if ((*table[i].fp)(iop, name, mode) == 0) | |
819 | return iop; | |
820 | else { | |
821 | warning("could not open %s, mode `%s'", | |
822 | name, mode); | |
823 | return NULL; | |
824 | } | |
825 | } | |
826 | } | |
827 | } | |
828 | ||
829 | strictopen: | |
830 | if (openfd == INVALID_HANDLE) | |
831 | openfd = open(name, flag, 0666); | |
832 | if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0) | |
833 | if ((buf.st_mode & S_IFMT) == S_IFDIR) | |
834 | fatal("file `%s' is a directory", name); | |
835 | iop = iop_alloc(openfd); | |
836 | return iop; | |
837 | } | |
838 | ||
839 | #ifndef PIPES_SIMULATED | |
840 | /* real pipes */ | |
841 | static int | |
842 | wait_any(interesting) | |
843 | int interesting; /* pid of interest, if any */ | |
844 | { | |
845 | SIGTYPE (*hstat)(), (*istat)(), (*qstat)(); | |
846 | int pid; | |
847 | int status = 0; | |
848 | struct redirect *redp; | |
849 | extern int errno; | |
850 | ||
851 | hstat = signal(SIGHUP, SIG_IGN); | |
852 | istat = signal(SIGINT, SIG_IGN); | |
853 | qstat = signal(SIGQUIT, SIG_IGN); | |
854 | for (;;) { | |
855 | #ifdef NeXT | |
856 | pid = wait((union wait *)&status); | |
857 | #else | |
858 | pid = wait(&status); | |
859 | #endif /* NeXT */ | |
860 | if (interesting && pid == interesting) { | |
861 | break; | |
862 | } else if (pid != -1) { | |
863 | for (redp = red_head; redp != NULL; redp = redp->next) | |
864 | if (pid == redp->pid) { | |
865 | redp->pid = -1; | |
866 | redp->status = status; | |
867 | if (redp->fp) { | |
868 | pclose(redp->fp); | |
869 | redp->fp = 0; | |
870 | } | |
871 | if (redp->iop) { | |
872 | (void) iop_close(redp->iop); | |
873 | redp->iop = 0; | |
874 | } | |
875 | break; | |
876 | } | |
877 | } | |
878 | if (pid == -1 && errno == ECHILD) | |
879 | break; | |
880 | } | |
881 | signal(SIGHUP, hstat); | |
882 | signal(SIGINT, istat); | |
883 | signal(SIGQUIT, qstat); | |
884 | return(status); | |
885 | } | |
886 | ||
887 | static IOBUF * | |
888 | gawk_popen(cmd, rp) | |
889 | char *cmd; | |
890 | struct redirect *rp; | |
891 | { | |
892 | int p[2]; | |
893 | register int pid; | |
894 | ||
895 | /* used to wait for any children to synchronize input and output, | |
896 | * but this could cause gawk to hang when it is started in a pipeline | |
897 | * and thus has a child process feeding it input (shell dependant) | |
898 | */ | |
899 | /*(void) wait_any(0);*/ /* wait for outstanding processes */ | |
900 | ||
901 | if (pipe(p) < 0) | |
902 | fatal("cannot open pipe \"%s\" (%s)", cmd, strerror(errno)); | |
903 | if ((pid = fork()) == 0) { | |
904 | if (close(1) == -1) | |
905 | fatal("close of stdout in child failed (%s)", | |
906 | strerror(errno)); | |
907 | if (dup(p[1]) != 1) | |
908 | fatal("dup of pipe failed (%s)", strerror(errno)); | |
909 | if (close(p[0]) == -1 || close(p[1]) == -1) | |
910 | fatal("close of pipe failed (%s)", strerror(errno)); | |
911 | if (close(0) == -1) | |
912 | fatal("close of stdin in child failed (%s)", | |
913 | strerror(errno)); | |
914 | execl("/bin/sh", "sh", "-c", cmd, 0); | |
915 | _exit(127); | |
916 | } | |
917 | if (pid == -1) | |
918 | fatal("cannot fork for \"%s\" (%s)", cmd, strerror(errno)); | |
919 | rp->pid = pid; | |
920 | if (close(p[1]) == -1) | |
921 | fatal("close of pipe failed (%s)", strerror(errno)); | |
922 | return (rp->iop = iop_alloc(p[0])); | |
923 | } | |
924 | ||
925 | static int | |
926 | gawk_pclose(rp) | |
927 | struct redirect *rp; | |
928 | { | |
929 | (void) iop_close(rp->iop); | |
930 | rp->iop = NULL; | |
931 | ||
932 | /* process previously found, return stored status */ | |
933 | if (rp->pid == -1) | |
934 | return (rp->status >> 8) & 0xFF; | |
935 | rp->status = wait_any(rp->pid); | |
936 | rp->pid = -1; | |
937 | return (rp->status >> 8) & 0xFF; | |
938 | } | |
939 | ||
940 | #else /* PIPES_SIMULATED */ | |
941 | /* use temporary file rather than pipe */ | |
942 | ||
943 | #ifdef VMS | |
944 | static IOBUF * | |
945 | gawk_popen(cmd, rp) | |
946 | char *cmd; | |
947 | struct redirect *rp; | |
948 | { | |
949 | FILE *current; | |
950 | ||
951 | if ((current = popen(cmd, "r")) == NULL) | |
952 | return NULL; | |
953 | return (rp->iop = iop_alloc(fileno(current))); | |
954 | } | |
955 | ||
956 | static int | |
957 | gawk_pclose(rp) | |
958 | struct redirect *rp; | |
959 | { | |
960 | int rval, aval, fd = rp->iop->fd; | |
961 | FILE *kludge = fdopen(fd, "r"); /* pclose needs FILE* w/ right fileno */ | |
962 | ||
963 | rp->iop->fd = dup(fd); /* kludge to allow close() + pclose() */ | |
964 | rval = iop_close(rp->iop); | |
965 | rp->iop = NULL; | |
966 | aval = pclose(kludge); | |
967 | return (rval < 0 ? rval : aval); | |
968 | } | |
969 | #else /* VMS */ | |
970 | ||
971 | static | |
972 | struct { | |
973 | char *command; | |
974 | char *name; | |
975 | } pipes[_NFILE]; | |
976 | ||
977 | static IOBUF * | |
978 | gawk_popen(cmd, rp) | |
979 | char *cmd; | |
980 | struct redirect *rp; | |
981 | { | |
982 | extern char *strdup(const char *); | |
983 | int current; | |
984 | char *name; | |
985 | static char cmdbuf[256]; | |
986 | ||
987 | /* get a name to use. */ | |
988 | if ((name = tempnam(".", "pip")) == NULL) | |
989 | return NULL; | |
990 | sprintf(cmdbuf,"%s > %s", cmd, name); | |
991 | system(cmdbuf); | |
992 | if ((current = open(name,O_RDONLY)) == INVALID_HANDLE) | |
993 | return NULL; | |
994 | pipes[current].name = name; | |
995 | pipes[current].command = strdup(cmd); | |
996 | rp->iop = iop_alloc(current); | |
997 | return (rp->iop = iop_alloc(current)); | |
998 | } | |
999 | ||
1000 | static int | |
1001 | gawk_pclose(rp) | |
1002 | struct redirect *rp; | |
1003 | { | |
1004 | int cur = rp->iop->fd; | |
1005 | int rval; | |
1006 | ||
1007 | rval = iop_close(rp->iop); | |
1008 | rp->iop = NULL; | |
1009 | ||
1010 | /* check for an open file */ | |
1011 | if (pipes[cur].name == NULL) | |
1012 | return -1; | |
1013 | unlink(pipes[cur].name); | |
1014 | free(pipes[cur].name); | |
1015 | pipes[cur].name = NULL; | |
1016 | free(pipes[cur].command); | |
1017 | return rval; | |
1018 | } | |
1019 | #endif /* VMS */ | |
1020 | ||
1021 | #endif /* PIPES_SIMULATED */ | |
1022 | ||
1023 | NODE * | |
1024 | do_getline(tree) | |
1025 | NODE *tree; | |
1026 | { | |
1027 | struct redirect *rp = NULL; | |
1028 | IOBUF *iop; | |
1029 | int cnt = EOF; | |
1030 | char *s = NULL; | |
1031 | int errcode; | |
1032 | ||
1033 | while (cnt == EOF) { | |
1034 | if (tree->rnode == NULL) { /* no redirection */ | |
1035 | iop = nextfile(0); | |
1036 | if (iop == NULL) /* end of input */ | |
1037 | return tmp_number((AWKNUM) 0.0); | |
1038 | } else { | |
1039 | int redir_error = 0; | |
1040 | ||
1041 | rp = redirect(tree->rnode, &redir_error); | |
1042 | if (rp == NULL && redir_error) { /* failed redirect */ | |
1043 | if (! do_unix) { | |
1044 | char *s = strerror(redir_error); | |
1045 | ||
1046 | unref(ERRNO_node->var_value); | |
1047 | ERRNO_node->var_value = | |
1048 | make_string(s, strlen(s)); | |
1049 | } | |
1050 | return tmp_number((AWKNUM) -1.0); | |
1051 | } | |
1052 | iop = rp->iop; | |
1053 | if (iop == NULL) /* end of input */ | |
1054 | return tmp_number((AWKNUM) 0.0); | |
1055 | } | |
1056 | errcode = 0; | |
1057 | cnt = get_a_record(&s, iop, *RS, & errcode); | |
1058 | if (! do_unix && errcode != 0) { | |
1059 | char *s = strerror(errcode); | |
1060 | ||
1061 | unref(ERRNO_node->var_value); | |
1062 | ERRNO_node->var_value = make_string(s, strlen(s)); | |
1063 | return tmp_number((AWKNUM) -1.0); | |
1064 | } | |
1065 | if (cnt == EOF) { | |
1066 | if (rp) { | |
1067 | /* | |
1068 | * Don't do iop_close() here if we are | |
1069 | * reading from a pipe; otherwise | |
1070 | * gawk_pclose will not be called. | |
1071 | */ | |
1072 | if (!(rp->flag & RED_PIPE)) { | |
1073 | (void) iop_close(iop); | |
1074 | rp->iop = NULL; | |
1075 | } | |
1076 | rp->flag |= RED_EOF; /* sticky EOF */ | |
1077 | return tmp_number((AWKNUM) 0.0); | |
1078 | } else | |
1079 | continue; /* try another file */ | |
1080 | } | |
1081 | if (!rp) { | |
1082 | NR += 1; | |
1083 | FNR += 1; | |
1084 | } | |
1085 | if (tree->lnode == NULL) /* no optional var. */ | |
1086 | set_record(s, cnt, 1); | |
1087 | else { /* assignment to variable */ | |
1088 | Func_ptr after_assign = NULL; | |
1089 | NODE **lhs; | |
1090 | ||
1091 | lhs = get_lhs(tree->lnode, &after_assign); | |
1092 | unref(*lhs); | |
1093 | *lhs = make_string(s, strlen(s)); | |
1094 | (*lhs)->flags |= MAYBE_NUM; | |
1095 | /* we may have to regenerate $0 here! */ | |
1096 | if (after_assign) | |
1097 | (*after_assign)(); | |
1098 | } | |
1099 | } | |
1100 | return tmp_number((AWKNUM) 1.0); | |
1101 | } | |
1102 | ||
1103 | int | |
1104 | pathopen (file) | |
1105 | char *file; | |
1106 | { | |
1107 | int fd = do_pathopen(file); | |
1108 | ||
1109 | #ifdef DEFAULT_FILETYPE | |
1110 | if (! do_unix && fd <= INVALID_HANDLE) { | |
1111 | char *file_awk; | |
1112 | int save = errno; | |
1113 | #ifdef VMS | |
1114 | int vms_save = vaxc$errno; | |
1115 | #endif | |
1116 | ||
1117 | /* append ".awk" and try again */ | |
1118 | emalloc(file_awk, char *, strlen(file) + | |
1119 | sizeof(DEFAULT_FILETYPE) + 1, "pathopen"); | |
1120 | sprintf(file_awk, "%s%s", file, DEFAULT_FILETYPE); | |
1121 | fd = do_pathopen(file_awk); | |
1122 | free(file_awk); | |
1123 | if (fd <= INVALID_HANDLE) { | |
1124 | errno = save; | |
1125 | #ifdef VMS | |
1126 | vaxc$errno = vms_save; | |
1127 | #endif | |
1128 | } | |
1129 | } | |
1130 | #endif /*DEFAULT_FILETYPE*/ | |
1131 | ||
1132 | return fd; | |
1133 | } | |
1134 | ||
1135 | static int | |
1136 | do_pathopen (file) | |
1137 | char *file; | |
1138 | { | |
1139 | static char *savepath = DEFPATH; /* defined in config.h */ | |
1140 | static int first = 1; | |
1141 | char *awkpath, *cp; | |
1142 | char trypath[BUFSIZ]; | |
1143 | int fd; | |
1144 | ||
1145 | if (STREQ(file, "-")) | |
1146 | return (0); | |
1147 | ||
1148 | if (do_unix) | |
1149 | return (devopen(file, "r")); | |
1150 | ||
1151 | if (first) { | |
1152 | first = 0; | |
1153 | if ((awkpath = getenv ("AWKPATH")) != NULL && *awkpath) | |
1154 | savepath = awkpath; /* used for restarting */ | |
1155 | } | |
1156 | awkpath = savepath; | |
1157 | ||
1158 | /* some kind of path name, no search */ | |
1159 | #ifdef VMS /* (strchr not equal implies either or both not NULL) */ | |
1160 | if (strchr(file, ':') != strchr(file, ']') | |
1161 | || strchr(file, '>') != strchr(file, '/')) | |
1162 | #else /*!VMS*/ | |
1163 | #ifdef MSDOS | |
1164 | if (strchr(file, '/') != strchr(file, '\\') | |
1165 | || strchr(file, ':') != NULL) | |
1166 | #else | |
1167 | if (strchr(file, '/') != NULL) | |
1168 | #endif /*MSDOS*/ | |
1169 | #endif /*VMS*/ | |
1170 | return (devopen(file, "r")); | |
1171 | ||
1172 | do { | |
1173 | trypath[0] = '\0'; | |
1174 | /* this should take into account limits on size of trypath */ | |
1175 | for (cp = trypath; *awkpath && *awkpath != ENVSEP; ) | |
1176 | *cp++ = *awkpath++; | |
1177 | ||
1178 | if (cp != trypath) { /* nun-null element in path */ | |
1179 | /* add directory punctuation only if needed */ | |
1180 | #ifdef VMS | |
1181 | if (strchr(":]>/", *(cp-1)) == NULL) | |
1182 | #else | |
1183 | #ifdef MSDOS | |
1184 | if (strchr(":\\/", *(cp-1)) == NULL) | |
1185 | #else | |
1186 | if (*(cp-1) != '/') | |
1187 | #endif | |
1188 | #endif | |
1189 | *cp++ = '/'; | |
1190 | /* append filename */ | |
1191 | strcpy (cp, file); | |
1192 | } else | |
1193 | strcpy (trypath, file); | |
1194 | if ((fd = devopen(trypath, "r")) >= 0) | |
1195 | return (fd); | |
1196 | ||
1197 | /* no luck, keep going */ | |
1198 | if(*awkpath == ENVSEP && awkpath[1] != '\0') | |
1199 | awkpath++; /* skip colon */ | |
1200 | } while (*awkpath); | |
1201 | /* | |
1202 | * You might have one of the awk | |
1203 | * paths defined, WITHOUT the current working directory in it. | |
1204 | * Therefore try to open the file in the current directory. | |
1205 | */ | |
1206 | return (devopen(file, "r")); | |
1207 | } |