summaryrefslogtreecommitdiff
path: root/io.c
blob: 86febf6ecf1748f74fe27f647c34974339f03dba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
/*	$NetBSD: io.c,v 1.18 2018/05/08 16:37:59 kamil Exp $	*/

/*
 * shell buffered IO and formatted output
 */
#include <sys/cdefs.h>

#ifndef lint
__RCSID("$NetBSD: io.c,v 1.18 2018/05/08 16:37:59 kamil Exp $");
#endif

#include <sys/stat.h>
#include <ctype.h>
#include "sh.h"

static int initio_done;

/*
 * formatted output functions
 */


/* A shell error occurred (eg, syntax error, etc.) */
void
errorf(const char *fmt, ...)
{
	va_list va;

	shl_stdout_ok = 0;	/* debugging: note that stdout not valid */
	exstat = 1;
	if (*fmt) {
		error_prefix(true);
		va_start(va, fmt);
		shf_vfprintf(shl_out, fmt, va);
		va_end(va);
		shf_putchar('\n', shl_out);
	}
	shf_flush(shl_out);
	unwind(LERROR);
}

/* like errorf(), but no unwind is done */
void
warningf(int fileline, const char *fmt, ...)
{
	va_list va;

	error_prefix(fileline);
	va_start(va, fmt);
	shf_vfprintf(shl_out, fmt, va);
	va_end(va);
	shf_putchar('\n', shl_out);
	shf_flush(shl_out);
}

/* Used by built-in utilities to prefix shell and utility name to message
 * (also unwinds environments for special builtins).
 */
void
bi_errorf(const char *fmt, ...)
{
	va_list va;

	shl_stdout_ok = 0;	/* debugging: note that stdout not valid */
	exstat = 1;
	if (*fmt) {
		error_prefix(true);
		/* not set when main() calls parse_args() */
		if (builtin_argv0)
			shf_fprintf(shl_out, "%s: ", builtin_argv0);
		va_start(va, fmt);
		shf_vfprintf(shl_out, fmt, va);
		va_end(va);
		shf_putchar('\n', shl_out);
	}
	shf_flush(shl_out);
	/* POSIX special builtins and ksh special builtins cause
	 * non-interactive shells to exit.
	 * XXX odd use of KEEPASN; also may not want LERROR here
	 */
	if ((builtin_flag & SPEC_BI)
	    || (Flag(FPOSIX) && (builtin_flag & KEEPASN)))
	{
		builtin_argv0 = (char *) 0;
		unwind(LERROR);
	}
}

/* Called when something that shouldn't happen does */
void
internal_errorf(int jump, const char *fmt, ...)
{
	va_list va;

	error_prefix(true);
	shf_fprintf(shl_out, "internal error: ");
	va_start(va, fmt);
	shf_vfprintf(shl_out, fmt, va);
	va_end(va);
	shf_putchar('\n', shl_out);
	shf_flush(shl_out);
	if (jump)
		unwind(LERROR);
}

/* used by error reporting functions to print "ksh: .kshrc[25]: " */
void
error_prefix(fileline)
	int fileline;
{
	/* Avoid foo: foo[2]: ... */
	if (!fileline || !source || !source->file
	    || strcmp(source->file, kshname) != 0)
		shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
	if (fileline && source && source->file != NULL) {
		shf_fprintf(shl_out, "%s[%d]: ", source->file,
			source->errline > 0 ? source->errline : source->line);
		source->errline = 0;
	}
}

/* printf to shl_out (stderr) with flush */
void
shellf(const char *fmt, ...)
{
	va_list va;

	if (!initio_done) /* shl_out may not be set up yet... */
		return;
	va_start(va, fmt);
	shf_vfprintf(shl_out, fmt, va);
	va_end(va);
	shf_flush(shl_out);
}

/* printf to shl_stdout (stdout) */
void
shprintf(const char *fmt, ...)
{
	va_list va;

	if (!shl_stdout_ok)
		internal_errorf(1, "shl_stdout not valid");
	va_start(va, fmt);
	shf_vfprintf(shl_stdout, fmt, va);
	va_end(va);
}

#ifdef KSH_DEBUG
static struct shf *kshdebug_shf;

void
kshdebug_init_()
{
	if (kshdebug_shf)
		shf_close(kshdebug_shf);
	kshdebug_shf = shf_open("/tmp/ksh-debug.log",
				O_WRONLY|O_APPEND|O_CREAT, 0600,
				SHF_WR|SHF_MAPHI);
	if (kshdebug_shf) {
		shf_fprintf(kshdebug_shf, "\nNew shell[pid %d]\n", getpid());
		shf_flush(kshdebug_shf);
	}
}

/* print to debugging log */
void
kshdebug_printf_(const char *fmt, ...)
{
	va_list va;

	if (!kshdebug_shf)
		return;
	va_start(va, fmt);
	shf_fprintf(kshdebug_shf, "[%d] ", getpid());
	shf_vfprintf(kshdebug_shf, fmt, va);
	va_end(va);
	shf_flush(kshdebug_shf);
}

void
kshdebug_dump_(str, mem, nbytes)
	const char *str;
	const void *mem;
	int nbytes;
{
	int i, j;
	int nprow = 16;

	if (!kshdebug_shf)
		return;
	shf_fprintf(kshdebug_shf, "[%d] %s:\n", getpid(), str);
	for (i = 0; i < nbytes; i += nprow) {
		char c = '\t';
		for (j = 0; j < nprow && i + j < nbytes; j++) {
			shf_fprintf(kshdebug_shf, "%c%02x",
				c, ((const unsigned char *) mem)[i + j]);
			c = ' ';
		}
		shf_fprintf(kshdebug_shf, "\n");
	}
	shf_flush(kshdebug_shf);
}
#endif /* KSH_DEBUG */

/* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
int
can_seek(fd)
	int fd;
{
	struct stat statb;

	return fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
		SHF_UNBUF : 0;
}

struct shf	shf_iob[3];

void
initio()
{
	shf_fdopen(1, SHF_WR, shl_stdout);	/* force buffer allocation */
	shf_fdopen(2, SHF_WR, shl_out);
	shf_fdopen(2, SHF_WR, shl_spare);	/* force buffer allocation */
	initio_done = 1;
	kshdebug_init();
}

/* A dup2() with error checking */
int
ksh_dup2(ofd, nfd, errok)
	int ofd;
	int nfd;
	int errok;
{
	int ret = dup2(ofd, nfd);

	if (ret < 0 && errno != EBADF && !errok)
		errorf("too many files open in shell");

	return ret;
}

/*
 * move fd from user space (0<=fd<10) to shell space (fd>=10),
 * set close-on-exec flag.
 */
int
savefd(fd, noclose)
	int fd;
	int noclose;
{
	int nfd;

	if (fd < FDBASE) {
		nfd = ksh_dupbase(fd, FDBASE);
		if (nfd < 0) {
			if (errno == EBADF)
				return -1;
			else
				errorf("too many files open in shell");
		}
		if (!noclose)
			close(fd);
	} else
		nfd = fd;
	fd_clexec(nfd);
	return nfd;
}

void
restfd(fd, ofd)
	int fd, ofd;
{
	if (fd == 2)
		shf_flush(&shf_iob[fd]);
	if (ofd < 0)		/* original fd closed */
		close(fd);
	else if (fd != ofd) {
		ksh_dup2(ofd, fd, true); /* XXX: what to do if this fails? */
		close(ofd);
	}
}

void
openpipe(pv)
	int *pv;
{
	if (pipe(pv) < 0)
		errorf("can't create pipe - try again");
	pv[0] = savefd(pv[0], 0);
	pv[1] = savefd(pv[1], 0);
}

void
closepipe(pv)
	int *pv;
{
	close(pv[0]);
	close(pv[1]);
}

/* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
 */
int
check_fd(name, mode, emsgp)
	char *name;
	int mode;
	const char **emsgp;
{
	int fd, fl;

	if (isdigit((unsigned char)name[0]) && !name[1]) {
		fd = name[0] - '0';
		if ((fl = fcntl(fd = name[0] - '0', F_GETFL, 0)) < 0) {
			if (emsgp)
				*emsgp = "bad file descriptor";
			return -1;
		}
		fl &= O_ACCMODE;

		/* X_OK is a kludge to disable this check for dups (x<&1):
		 * historical shells never did this check (XXX don't know what
		 * posix has to say).
		 */
		if (!(mode & X_OK) && fl != O_RDWR
		    && (((mode & R_OK) && fl != O_RDONLY)
			|| ((mode & W_OK) && fl != O_WRONLY)))
		{
			if (emsgp)
				*emsgp = (fl == O_WRONLY) ?
						"fd not open for reading"
					      : "fd not open for writing";
			return -1;
		}
		return fd;
	}
#ifdef KSH
	else if (name[0] == 'p' && !name[1])
		return coproc_getfd(mode, emsgp);
#endif /* KSH */
	if (emsgp)
		*emsgp = "illegal file descriptor name";
	return -1;
}

#ifdef KSH
/* Called once from main */
void
coproc_init()
{
	coproc.read = coproc.readw = coproc.write = -1;
	coproc.njobs = 0;
	coproc.id = 0;
}

/* Called by c_read() when eof is read - close fd if it is the co-process fd */
void
coproc_read_close(fd)
	int fd;
{
	if (coproc.read >= 0 && fd == coproc.read) {
		coproc_readw_close(fd);
		close(coproc.read);
		coproc.read = -1;
	}
}

/* Called by c_read() and by iosetup() to close the other side of the
 * read pipe, so reads will actually terminate.
 */
void
coproc_readw_close(fd)
	int fd;
{
	if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
		close(coproc.readw);
		coproc.readw = -1;
	}
}

/* Called by c_print when a write to a fd fails with EPIPE and by iosetup
 * when co-process input is dup'd
 */
void
coproc_write_close(fd)
	int fd;
{
	if (coproc.write >= 0 && fd == coproc.write) {
		close(coproc.write);
		coproc.write = -1;
	}
}

/* Called to check for existence of/value of the co-process file descriptor.
 * (Used by check_fd() and by c_read/c_print to deal with -p option).
 */
int
coproc_getfd(mode, emsgp)
	int mode;
	const char **emsgp;
{
	int fd = (mode & R_OK) ? coproc.read : coproc.write;

	if (fd >= 0)
		return fd;
	if (emsgp)
		*emsgp = "no coprocess";
	return -1;
}

/* called to close file descriptors related to the coprocess (if any)
 * Should be called with SIGCHLD blocked.
 */
void
coproc_cleanup(reuse)
	int reuse;
{
	/* This to allow co-processes to share output pipe */
	if (!reuse || coproc.readw < 0 || coproc.read < 0) {
		if (coproc.read >= 0) {
			close(coproc.read);
			coproc.read = -1;
		}
		if (coproc.readw >= 0) {
			close(coproc.readw);
			coproc.readw = -1;
		}
	}
	if (coproc.write >= 0) {
		close(coproc.write);
		coproc.write = -1;
	}
}
#endif /* KSH */


/*
 * temporary files
 */

struct temp *
maketemp(ap, type, tlist)
	Area *ap;
	Temp_type type;
	struct temp **tlist;
{
#ifndef __NetBSD__
	static unsigned int inc;
#endif
	struct temp *tp;
	int len;
	int fd;
	char *pathx;
	const char *dir;

	dir = tmpdir ? tmpdir : "/tmp";
	/* The 20 + 20 is a paranoid worst case for pid/inc */
	len = strlen(dir) + 3 + 20 + 20 + 1;
	tp = (struct temp *) alloc(sizeof(struct temp) + len, ap);
	tp->name = pathx = (char *) &tp[1];
	tp->shf = (struct shf *) 0;
	tp->type = type;
#ifdef __NetBSD__
	shf_snprintf(pathx, len, "%s/shXXXXXXXX", dir);
	fd = mkstemp(pathx);
	if (fd >= 0)
		tp->shf = shf_fdopen(fd, SHF_WR, (struct shf *) 0);
#else
	while (1) {
		/* Note that temp files need to fit 8.3 DOS limits */
		shf_snprintf(pathx, len, "%s/sh%05u.%03x",
			     dir, (unsigned) procpid, inc++);
		/* Mode 0600 to be paranoid, O_TRUNC in case O_EXCL isn't
		 * really there.
		 */
		fd = open(pathx, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600);
		if (fd >= 0) {
			tp->shf = shf_fdopen(fd, SHF_WR, (struct shf *) 0);
			break;
		}
		if (errno != EINTR
#ifdef EEXIST
		    && errno != EEXIST
#endif /* EEXIST */
#ifdef EISDIR
		    && errno != EISDIR
#endif /* EISDIR */
			)
			/* Error must be printed by caller: don't know here if
			 * errorf() or bi_errorf() should be used.
			 */
			break;
	}
#endif /* __NetBSD__ */
	tp->pid = procpid;

	tp->next = *tlist;
	*tlist = tp;

	return tp;
}