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Rev Author Line No. Line
5191 serge 1
/* Extended support for using errno values.
2
   Written by Fred Fish.  fnf@cygnus.com
3
   This file is in the public domain.  --Per Bothner.  */
4
 
5
#include "config.h"
6
 
7
#ifdef HAVE_SYS_ERRLIST
8
/* Note that errno.h (not sure what OS) or stdio.h (BSD 4.4, at least)
9
   might declare sys_errlist in a way that the compiler might consider
10
   incompatible with our later declaration, perhaps by using const
11
   attributes.  So we hide the declaration in errno.h (if any) using a
12
   macro. */
13
#define sys_nerr sys_nerr__
14
#define sys_errlist sys_errlist__
15
#endif
16
 
17
#include "ansidecl.h"
18
#include "libiberty.h"
19
 
20
#include 
21
#include 
22
 
23
#ifdef HAVE_SYS_ERRLIST
24
#undef sys_nerr
25
#undef sys_errlist
26
#endif
27
 
28
/*  Routines imported from standard C runtime libraries. */
29
 
30
#ifdef HAVE_STDLIB_H
31
#include 
32
#else
33
extern PTR malloc ();
34
#endif
35
 
36
#ifdef HAVE_STRING_H
37
#include 
38
#else
39
extern PTR memset ();
40
#endif
41
 
42
#ifndef MAX
43
#  define MAX(a,b) ((a) > (b) ? (a) : (b))
44
#endif
45
 
46
static void init_error_tables (void);
47
 
48
/* Translation table for errno values.  See intro(2) in most UNIX systems
49
   Programmers Reference Manuals.
50
 
51
   Note that this table is generally only accessed when it is used at runtime
52
   to initialize errno name and message tables that are indexed by errno
53
   value.
54
 
55
   Not all of these errnos will exist on all systems.  This table is the only
56
   thing that should have to be updated as new error numbers are introduced.
57
   It's sort of ugly, but at least its portable. */
58
 
59
struct error_info
60
{
61
  const int value;		/* The numeric value from  */
62
  const char *const name;	/* The equivalent symbolic value */
63
#ifndef HAVE_SYS_ERRLIST
64
  const char *const msg;	/* Short message about this value */
65
#endif
66
};
67
 
68
#ifndef HAVE_SYS_ERRLIST
69
#   define ENTRY(value, name, msg)	{value, name, msg}
70
#else
71
#   define ENTRY(value, name, msg)	{value, name}
72
#endif
73
 
74
static const struct error_info error_table[] =
75
{
76
#if defined (EPERM)
77
  ENTRY(EPERM, "EPERM", "Not owner"),
78
#endif
79
#if defined (ENOENT)
80
  ENTRY(ENOENT, "ENOENT", "No such file or directory"),
81
#endif
82
#if defined (ESRCH)
83
  ENTRY(ESRCH, "ESRCH", "No such process"),
84
#endif
85
#if defined (EINTR)
86
  ENTRY(EINTR, "EINTR", "Interrupted system call"),
87
#endif
88
#if defined (EIO)
89
  ENTRY(EIO, "EIO", "I/O error"),
90
#endif
91
#if defined (ENXIO)
92
  ENTRY(ENXIO, "ENXIO", "No such device or address"),
93
#endif
94
#if defined (E2BIG)
95
  ENTRY(E2BIG, "E2BIG", "Arg list too long"),
96
#endif
97
#if defined (ENOEXEC)
98
  ENTRY(ENOEXEC, "ENOEXEC", "Exec format error"),
99
#endif
100
#if defined (EBADF)
101
  ENTRY(EBADF, "EBADF", "Bad file number"),
102
#endif
103
#if defined (ECHILD)
104
  ENTRY(ECHILD, "ECHILD", "No child processes"),
105
#endif
106
#if defined (EWOULDBLOCK)	/* Put before EAGAIN, sometimes aliased */
107
  ENTRY(EWOULDBLOCK, "EWOULDBLOCK", "Operation would block"),
108
#endif
109
#if defined (EAGAIN)
110
  ENTRY(EAGAIN, "EAGAIN", "No more processes"),
111
#endif
112
#if defined (ENOMEM)
113
  ENTRY(ENOMEM, "ENOMEM", "Not enough space"),
114
#endif
115
#if defined (EACCES)
116
  ENTRY(EACCES, "EACCES", "Permission denied"),
117
#endif
118
#if defined (EFAULT)
119
  ENTRY(EFAULT, "EFAULT", "Bad address"),
120
#endif
121
#if defined (ENOTBLK)
122
  ENTRY(ENOTBLK, "ENOTBLK", "Block device required"),
123
#endif
124
#if defined (EBUSY)
125
  ENTRY(EBUSY, "EBUSY", "Device busy"),
126
#endif
127
#if defined (EEXIST)
128
  ENTRY(EEXIST, "EEXIST", "File exists"),
129
#endif
130
#if defined (EXDEV)
131
  ENTRY(EXDEV, "EXDEV", "Cross-device link"),
132
#endif
133
#if defined (ENODEV)
134
  ENTRY(ENODEV, "ENODEV", "No such device"),
135
#endif
136
#if defined (ENOTDIR)
137
  ENTRY(ENOTDIR, "ENOTDIR", "Not a directory"),
138
#endif
139
#if defined (EISDIR)
140
  ENTRY(EISDIR, "EISDIR", "Is a directory"),
141
#endif
142
#if defined (EINVAL)
143
  ENTRY(EINVAL, "EINVAL", "Invalid argument"),
144
#endif
145
#if defined (ENFILE)
146
  ENTRY(ENFILE, "ENFILE", "File table overflow"),
147
#endif
148
#if defined (EMFILE)
149
  ENTRY(EMFILE, "EMFILE", "Too many open files"),
150
#endif
151
#if defined (ENOTTY)
152
  ENTRY(ENOTTY, "ENOTTY", "Not a typewriter"),
153
#endif
154
#if defined (ETXTBSY)
155
  ENTRY(ETXTBSY, "ETXTBSY", "Text file busy"),
156
#endif
157
#if defined (EFBIG)
158
  ENTRY(EFBIG, "EFBIG", "File too large"),
159
#endif
160
#if defined (ENOSPC)
161
  ENTRY(ENOSPC, "ENOSPC", "No space left on device"),
162
#endif
163
#if defined (ESPIPE)
164
  ENTRY(ESPIPE, "ESPIPE", "Illegal seek"),
165
#endif
166
#if defined (EROFS)
167
  ENTRY(EROFS, "EROFS", "Read-only file system"),
168
#endif
169
#if defined (EMLINK)
170
  ENTRY(EMLINK, "EMLINK", "Too many links"),
171
#endif
172
#if defined (EPIPE)
173
  ENTRY(EPIPE, "EPIPE", "Broken pipe"),
174
#endif
175
#if defined (EDOM)
176
  ENTRY(EDOM, "EDOM", "Math argument out of domain of func"),
177
#endif
178
#if defined (ERANGE)
179
  ENTRY(ERANGE, "ERANGE", "Math result not representable"),
180
#endif
181
#if defined (ENOMSG)
182
  ENTRY(ENOMSG, "ENOMSG", "No message of desired type"),
183
#endif
184
#if defined (EIDRM)
185
  ENTRY(EIDRM, "EIDRM", "Identifier removed"),
186
#endif
187
#if defined (ECHRNG)
188
  ENTRY(ECHRNG, "ECHRNG", "Channel number out of range"),
189
#endif
190
#if defined (EL2NSYNC)
191
  ENTRY(EL2NSYNC, "EL2NSYNC", "Level 2 not synchronized"),
192
#endif
193
#if defined (EL3HLT)
194
  ENTRY(EL3HLT, "EL3HLT", "Level 3 halted"),
195
#endif
196
#if defined (EL3RST)
197
  ENTRY(EL3RST, "EL3RST", "Level 3 reset"),
198
#endif
199
#if defined (ELNRNG)
200
  ENTRY(ELNRNG, "ELNRNG", "Link number out of range"),
201
#endif
202
#if defined (EUNATCH)
203
  ENTRY(EUNATCH, "EUNATCH", "Protocol driver not attached"),
204
#endif
205
#if defined (ENOCSI)
206
  ENTRY(ENOCSI, "ENOCSI", "No CSI structure available"),
207
#endif
208
#if defined (EL2HLT)
209
  ENTRY(EL2HLT, "EL2HLT", "Level 2 halted"),
210
#endif
211
#if defined (EDEADLK)
212
  ENTRY(EDEADLK, "EDEADLK", "Deadlock condition"),
213
#endif
214
#if defined (ENOLCK)
215
  ENTRY(ENOLCK, "ENOLCK", "No record locks available"),
216
#endif
217
#if defined (EBADE)
218
  ENTRY(EBADE, "EBADE", "Invalid exchange"),
219
#endif
220
#if defined (EBADR)
221
  ENTRY(EBADR, "EBADR", "Invalid request descriptor"),
222
#endif
223
#if defined (EXFULL)
224
  ENTRY(EXFULL, "EXFULL", "Exchange full"),
225
#endif
226
#if defined (ENOANO)
227
  ENTRY(ENOANO, "ENOANO", "No anode"),
228
#endif
229
#if defined (EBADRQC)
230
  ENTRY(EBADRQC, "EBADRQC", "Invalid request code"),
231
#endif
232
#if defined (EBADSLT)
233
  ENTRY(EBADSLT, "EBADSLT", "Invalid slot"),
234
#endif
235
#if defined (EDEADLOCK)
236
  ENTRY(EDEADLOCK, "EDEADLOCK", "File locking deadlock error"),
237
#endif
238
#if defined (EBFONT)
239
  ENTRY(EBFONT, "EBFONT", "Bad font file format"),
240
#endif
241
#if defined (ENOSTR)
242
  ENTRY(ENOSTR, "ENOSTR", "Device not a stream"),
243
#endif
244
#if defined (ENODATA)
245
  ENTRY(ENODATA, "ENODATA", "No data available"),
246
#endif
247
#if defined (ETIME)
248
  ENTRY(ETIME, "ETIME", "Timer expired"),
249
#endif
250
#if defined (ENOSR)
251
  ENTRY(ENOSR, "ENOSR", "Out of streams resources"),
252
#endif
253
#if defined (ENONET)
254
  ENTRY(ENONET, "ENONET", "Machine is not on the network"),
255
#endif
256
#if defined (ENOPKG)
257
  ENTRY(ENOPKG, "ENOPKG", "Package not installed"),
258
#endif
259
#if defined (EREMOTE)
260
  ENTRY(EREMOTE, "EREMOTE", "Object is remote"),
261
#endif
262
#if defined (ENOLINK)
263
  ENTRY(ENOLINK, "ENOLINK", "Link has been severed"),
264
#endif
265
#if defined (EADV)
266
  ENTRY(EADV, "EADV", "Advertise error"),
267
#endif
268
#if defined (ESRMNT)
269
  ENTRY(ESRMNT, "ESRMNT", "Srmount error"),
270
#endif
271
#if defined (ECOMM)
272
  ENTRY(ECOMM, "ECOMM", "Communication error on send"),
273
#endif
274
#if defined (EPROTO)
275
  ENTRY(EPROTO, "EPROTO", "Protocol error"),
276
#endif
277
#if defined (EMULTIHOP)
278
  ENTRY(EMULTIHOP, "EMULTIHOP", "Multihop attempted"),
279
#endif
280
#if defined (EDOTDOT)
281
  ENTRY(EDOTDOT, "EDOTDOT", "RFS specific error"),
282
#endif
283
#if defined (EBADMSG)
284
  ENTRY(EBADMSG, "EBADMSG", "Not a data message"),
285
#endif
286
#if defined (ENAMETOOLONG)
287
  ENTRY(ENAMETOOLONG, "ENAMETOOLONG", "File name too long"),
288
#endif
289
#if defined (EOVERFLOW)
290
  ENTRY(EOVERFLOW, "EOVERFLOW", "Value too large for defined data type"),
291
#endif
292
#if defined (ENOTUNIQ)
293
  ENTRY(ENOTUNIQ, "ENOTUNIQ", "Name not unique on network"),
294
#endif
295
#if defined (EBADFD)
296
  ENTRY(EBADFD, "EBADFD", "File descriptor in bad state"),
297
#endif
298
#if defined (EREMCHG)
299
  ENTRY(EREMCHG, "EREMCHG", "Remote address changed"),
300
#endif
301
#if defined (ELIBACC)
302
  ENTRY(ELIBACC, "ELIBACC", "Can not access a needed shared library"),
303
#endif
304
#if defined (ELIBBAD)
305
  ENTRY(ELIBBAD, "ELIBBAD", "Accessing a corrupted shared library"),
306
#endif
307
#if defined (ELIBSCN)
308
  ENTRY(ELIBSCN, "ELIBSCN", ".lib section in a.out corrupted"),
309
#endif
310
#if defined (ELIBMAX)
311
  ENTRY(ELIBMAX, "ELIBMAX", "Attempting to link in too many shared libraries"),
312
#endif
313
#if defined (ELIBEXEC)
314
  ENTRY(ELIBEXEC, "ELIBEXEC", "Cannot exec a shared library directly"),
315
#endif
316
#if defined (EILSEQ)
317
  ENTRY(EILSEQ, "EILSEQ", "Illegal byte sequence"),
318
#endif
319
#if defined (ENOSYS)
320
  ENTRY(ENOSYS, "ENOSYS", "Operation not applicable"),
321
#endif
322
#if defined (ELOOP)
323
  ENTRY(ELOOP, "ELOOP", "Too many symbolic links encountered"),
324
#endif
325
#if defined (ERESTART)
326
  ENTRY(ERESTART, "ERESTART", "Interrupted system call should be restarted"),
327
#endif
328
#if defined (ESTRPIPE)
329
  ENTRY(ESTRPIPE, "ESTRPIPE", "Streams pipe error"),
330
#endif
331
#if defined (ENOTEMPTY)
332
  ENTRY(ENOTEMPTY, "ENOTEMPTY", "Directory not empty"),
333
#endif
334
#if defined (EUSERS)
335
  ENTRY(EUSERS, "EUSERS", "Too many users"),
336
#endif
337
#if defined (ENOTSOCK)
338
  ENTRY(ENOTSOCK, "ENOTSOCK", "Socket operation on non-socket"),
339
#endif
340
#if defined (EDESTADDRREQ)
341
  ENTRY(EDESTADDRREQ, "EDESTADDRREQ", "Destination address required"),
342
#endif
343
#if defined (EMSGSIZE)
344
  ENTRY(EMSGSIZE, "EMSGSIZE", "Message too long"),
345
#endif
346
#if defined (EPROTOTYPE)
347
  ENTRY(EPROTOTYPE, "EPROTOTYPE", "Protocol wrong type for socket"),
348
#endif
349
#if defined (ENOPROTOOPT)
350
  ENTRY(ENOPROTOOPT, "ENOPROTOOPT", "Protocol not available"),
351
#endif
352
#if defined (EPROTONOSUPPORT)
353
  ENTRY(EPROTONOSUPPORT, "EPROTONOSUPPORT", "Protocol not supported"),
354
#endif
355
#if defined (ESOCKTNOSUPPORT)
356
  ENTRY(ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT", "Socket type not supported"),
357
#endif
358
#if defined (EOPNOTSUPP)
359
  ENTRY(EOPNOTSUPP, "EOPNOTSUPP", "Operation not supported on transport endpoint"),
360
#endif
361
#if defined (EPFNOSUPPORT)
362
  ENTRY(EPFNOSUPPORT, "EPFNOSUPPORT", "Protocol family not supported"),
363
#endif
364
#if defined (EAFNOSUPPORT)
365
  ENTRY(EAFNOSUPPORT, "EAFNOSUPPORT", "Address family not supported by protocol"),
366
#endif
367
#if defined (EADDRINUSE)
368
  ENTRY(EADDRINUSE, "EADDRINUSE", "Address already in use"),
369
#endif
370
#if defined (EADDRNOTAVAIL)
371
  ENTRY(EADDRNOTAVAIL, "EADDRNOTAVAIL","Cannot assign requested address"),
372
#endif
373
#if defined (ENETDOWN)
374
  ENTRY(ENETDOWN, "ENETDOWN", "Network is down"),
375
#endif
376
#if defined (ENETUNREACH)
377
  ENTRY(ENETUNREACH, "ENETUNREACH", "Network is unreachable"),
378
#endif
379
#if defined (ENETRESET)
380
  ENTRY(ENETRESET, "ENETRESET", "Network dropped connection because of reset"),
381
#endif
382
#if defined (ECONNABORTED)
383
  ENTRY(ECONNABORTED, "ECONNABORTED", "Software caused connection abort"),
384
#endif
385
#if defined (ECONNRESET)
386
  ENTRY(ECONNRESET, "ECONNRESET", "Connection reset by peer"),
387
#endif
388
#if defined (ENOBUFS)
389
  ENTRY(ENOBUFS, "ENOBUFS", "No buffer space available"),
390
#endif
391
#if defined (EISCONN)
392
  ENTRY(EISCONN, "EISCONN", "Transport endpoint is already connected"),
393
#endif
394
#if defined (ENOTCONN)
395
  ENTRY(ENOTCONN, "ENOTCONN", "Transport endpoint is not connected"),
396
#endif
397
#if defined (ESHUTDOWN)
398
  ENTRY(ESHUTDOWN, "ESHUTDOWN", "Cannot send after transport endpoint shutdown"),
399
#endif
400
#if defined (ETOOMANYREFS)
401
  ENTRY(ETOOMANYREFS, "ETOOMANYREFS", "Too many references: cannot splice"),
402
#endif
403
#if defined (ETIMEDOUT)
404
  ENTRY(ETIMEDOUT, "ETIMEDOUT", "Connection timed out"),
405
#endif
406
#if defined (ECONNREFUSED)
407
  ENTRY(ECONNREFUSED, "ECONNREFUSED", "Connection refused"),
408
#endif
409
#if defined (EHOSTDOWN)
410
  ENTRY(EHOSTDOWN, "EHOSTDOWN", "Host is down"),
411
#endif
412
#if defined (EHOSTUNREACH)
413
  ENTRY(EHOSTUNREACH, "EHOSTUNREACH", "No route to host"),
414
#endif
415
#if defined (EALREADY)
416
  ENTRY(EALREADY, "EALREADY", "Operation already in progress"),
417
#endif
418
#if defined (EINPROGRESS)
419
  ENTRY(EINPROGRESS, "EINPROGRESS", "Operation now in progress"),
420
#endif
421
#if defined (ESTALE)
422
  ENTRY(ESTALE, "ESTALE", "Stale NFS file handle"),
423
#endif
424
#if defined (EUCLEAN)
425
  ENTRY(EUCLEAN, "EUCLEAN", "Structure needs cleaning"),
426
#endif
427
#if defined (ENOTNAM)
428
  ENTRY(ENOTNAM, "ENOTNAM", "Not a XENIX named type file"),
429
#endif
430
#if defined (ENAVAIL)
431
  ENTRY(ENAVAIL, "ENAVAIL", "No XENIX semaphores available"),
432
#endif
433
#if defined (EISNAM)
434
  ENTRY(EISNAM, "EISNAM", "Is a named type file"),
435
#endif
436
#if defined (EREMOTEIO)
437
  ENTRY(EREMOTEIO, "EREMOTEIO", "Remote I/O error"),
438
#endif
439
  ENTRY(0, NULL, NULL)
440
};
441
 
442
#ifdef EVMSERR
443
/* This is not in the table, because the numeric value of EVMSERR (32767)
444
   lies outside the range of sys_errlist[].  */
445
static struct { int value; const char *name, *msg; }
446
  evmserr = { EVMSERR, "EVMSERR", "VMS-specific error" };
447
#endif
448
 
449
/* Translation table allocated and initialized at runtime.  Indexed by the
450
   errno value to find the equivalent symbolic value. */
451
 
452
static const char **error_names;
453
static int num_error_names = 0;
454
 
455
/* Translation table allocated and initialized at runtime, if it does not
456
   already exist in the host environment.  Indexed by the errno value to find
457
   the descriptive string.
458
 
459
   We don't export it for use in other modules because even though it has the
460
   same name, it differs from other implementations in that it is dynamically
461
   initialized rather than statically initialized. */
462
 
463
#ifndef HAVE_SYS_ERRLIST
464
 
465
#define sys_nerr sys_nerr__
466
#define sys_errlist sys_errlist__
467
static int sys_nerr;
468
static const char **sys_errlist;
469
 
470
#else
471
 
6324 serge 472
 
473
#ifndef sys_nerr
5191 serge 474
extern int sys_nerr;
6324 serge 475
#endif
476
#ifndef sys_errlist
5191 serge 477
extern char *sys_errlist[];
6324 serge 478
#endif
5191 serge 479
 
480
#endif
481
 
482
/*
483
 
484
NAME
485
 
486
	init_error_tables -- initialize the name and message tables
487
 
488
SYNOPSIS
489
 
490
	static void init_error_tables ();
491
 
492
DESCRIPTION
493
 
494
	Using the error_table, which is initialized at compile time, generate
495
	the error_names and the sys_errlist (if needed) tables, which are
496
	indexed at runtime by a specific errno value.
497
 
498
BUGS
499
 
500
	The initialization of the tables may fail under low memory conditions,
501
	in which case we don't do anything particularly useful, but we don't
502
	bomb either.  Who knows, it might succeed at a later point if we free
503
	some memory in the meantime.  In any case, the other routines know
504
	how to deal with lack of a table after trying to initialize it.  This
505
	may or may not be considered to be a bug, that we don't specifically
506
	warn about this particular failure mode.
507
 
508
*/
509
 
510
static void
511
init_error_tables (void)
512
{
513
  const struct error_info *eip;
514
  int nbytes;
515
 
516
  /* If we haven't already scanned the error_table once to find the maximum
517
     errno value, then go find it now. */
518
 
519
  if (num_error_names == 0)
520
    {
521
      for (eip = error_table; eip -> name != NULL; eip++)
522
	{
523
	  if (eip -> value >= num_error_names)
524
	    {
525
	      num_error_names = eip -> value + 1;
526
	    }
527
	}
528
    }
529
 
530
  /* Now attempt to allocate the error_names table, zero it out, and then
531
     initialize it from the statically initialized error_table. */
532
 
533
  if (error_names == NULL)
534
    {
535
      nbytes = num_error_names * sizeof (char *);
536
      if ((error_names = (const char **) malloc (nbytes)) != NULL)
537
	{
538
	  memset (error_names, 0, nbytes);
539
	  for (eip = error_table; eip -> name != NULL; eip++)
540
	    {
541
	      error_names[eip -> value] = eip -> name;
542
	    }
543
	}
544
    }
545
 
546
#ifndef HAVE_SYS_ERRLIST
547
 
548
  /* Now attempt to allocate the sys_errlist table, zero it out, and then
549
     initialize it from the statically initialized error_table. */
550
 
551
  if (sys_errlist == NULL)
552
    {
553
      nbytes = num_error_names * sizeof (char *);
554
      if ((sys_errlist = (const char **) malloc (nbytes)) != NULL)
555
	{
556
	  memset (sys_errlist, 0, nbytes);
557
	  sys_nerr = num_error_names;
558
	  for (eip = error_table; eip -> name != NULL; eip++)
559
	    {
560
	      sys_errlist[eip -> value] = eip -> msg;
561
	    }
562
	}
563
    }
564
 
565
#endif
566
 
567
}
568
 
569
/*
570
 
571
 
572
@deftypefn Extension int errno_max (void)
573
 
574
Returns the maximum @code{errno} value for which a corresponding
575
symbolic name or message is available.  Note that in the case where we
576
use the @code{sys_errlist} supplied by the system, it is possible for
577
there to be more symbolic names than messages, or vice versa.  In
578
fact, the manual page for @code{perror(3C)} explicitly warns that one
579
should check the size of the table (@code{sys_nerr}) before indexing
580
it, since new error codes may be added to the system before they are
581
added to the table.  Thus @code{sys_nerr} might be smaller than value
582
implied by the largest @code{errno} value defined in @code{}.
583
 
584
We return the maximum value that can be used to obtain a meaningful
585
symbolic name or message.
586
 
587
@end deftypefn
588
 
589
*/
590
 
591
int
592
errno_max (void)
593
{
594
  int maxsize;
595
 
596
  if (error_names == NULL)
597
    {
598
      init_error_tables ();
599
    }
600
  maxsize = MAX (sys_nerr, num_error_names);
601
  return (maxsize - 1);
602
}
603
 
604
#ifndef HAVE_STRERROR
605
 
606
/*
607
 
608
@deftypefn Supplemental char* strerror (int @var{errnoval})
609
 
610
Maps an @code{errno} number to an error message string, the contents
611
of which are implementation defined.  On systems which have the
612
external variables @code{sys_nerr} and @code{sys_errlist}, these
613
strings will be the same as the ones used by @code{perror}.
614
 
615
If the supplied error number is within the valid range of indices for
616
the @code{sys_errlist}, but no message is available for the particular
617
error number, then returns the string @samp{Error @var{num}}, where
618
@var{num} is the error number.
619
 
620
If the supplied error number is not a valid index into
621
@code{sys_errlist}, returns @code{NULL}.
622
 
623
The returned string is only guaranteed to be valid only until the
624
next call to @code{strerror}.
625
 
626
@end deftypefn
627
 
628
*/
629
 
630
char *
631
strerror (int errnoval)
632
{
633
  const char *msg;
634
  static char buf[32];
635
 
636
#ifndef HAVE_SYS_ERRLIST
637
 
638
  if (error_names == NULL)
639
    {
640
      init_error_tables ();
641
    }
642
 
643
#endif
644
 
645
  if ((errnoval < 0) || (errnoval >= sys_nerr))
646
    {
647
#ifdef EVMSERR
648
      if (errnoval == evmserr.value)
649
	msg = evmserr.msg;
650
      else
651
#endif
652
      /* Out of range, just return NULL */
653
      msg = NULL;
654
    }
655
  else if ((sys_errlist == NULL) || (sys_errlist[errnoval] == NULL))
656
    {
657
      /* In range, but no sys_errlist or no entry at this index. */
658
      sprintf (buf, "Error %d", errnoval);
659
      msg = buf;
660
    }
661
  else
662
    {
663
      /* In range, and a valid message.  Just return the message. */
664
      msg = (char *) sys_errlist[errnoval];
665
    }
666
 
667
  return (msg);
668
}
669
 
670
#endif	/* ! HAVE_STRERROR */
671
 
672
 
673
/*
674
 
675
@deftypefn Replacement {const char*} strerrno (int @var{errnum})
676
 
677
Given an error number returned from a system call (typically returned
678
in @code{errno}), returns a pointer to a string containing the
679
symbolic name of that error number, as found in @code{}.
680
 
681
If the supplied error number is within the valid range of indices for
682
symbolic names, but no name is available for the particular error
683
number, then returns the string @samp{Error @var{num}}, where @var{num}
684
is the error number.
685
 
686
If the supplied error number is not within the range of valid
687
indices, then returns @code{NULL}.
688
 
689
The contents of the location pointed to are only guaranteed to be
690
valid until the next call to @code{strerrno}.
691
 
692
@end deftypefn
693
 
694
*/
695
 
696
const char *
697
strerrno (int errnoval)
698
{
699
  const char *name;
700
  static char buf[32];
701
 
702
  if (error_names == NULL)
703
    {
704
      init_error_tables ();
705
    }
706
 
707
  if ((errnoval < 0) || (errnoval >= num_error_names))
708
    {
709
#ifdef EVMSERR
710
      if (errnoval == evmserr.value)
711
	name = evmserr.name;
712
      else
713
#endif
714
      /* Out of range, just return NULL */
715
      name = NULL;
716
    }
717
  else if ((error_names == NULL) || (error_names[errnoval] == NULL))
718
    {
719
      /* In range, but no error_names or no entry at this index. */
720
      sprintf (buf, "Error %d", errnoval);
721
      name = (const char *) buf;
722
    }
723
  else
724
    {
725
      /* In range, and a valid name.  Just return the name. */
726
      name = error_names[errnoval];
727
    }
728
 
729
  return (name);
730
}
731
 
732
/*
733
 
734
@deftypefn Extension int strtoerrno (const char *@var{name})
735
 
736
Given the symbolic name of a error number (e.g., @code{EACCES}), map it
737
to an errno value.  If no translation is found, returns 0.
738
 
739
@end deftypefn
740
 
741
*/
742
 
743
int
744
strtoerrno (const char *name)
745
{
746
  int errnoval = 0;
747
 
748
  if (name != NULL)
749
    {
750
      if (error_names == NULL)
751
	{
752
	  init_error_tables ();
753
	}
754
      for (errnoval = 0; errnoval < num_error_names; errnoval++)
755
	{
756
	  if ((error_names[errnoval] != NULL) &&
757
	      (strcmp (name, error_names[errnoval]) == 0))
758
	    {
759
	      break;
760
	    }
761
	}
762
      if (errnoval == num_error_names)
763
	{
764
#ifdef EVMSERR
765
	  if (strcmp (name, evmserr.name) == 0)
766
	    errnoval = evmserr.value;
767
	  else
768
#endif
769
	  errnoval = 0;
770
	}
771
    }
772
  return (errnoval);
773
}
774
 
775
 
776
/* A simple little main that does nothing but print all the errno translations
777
   if MAIN is defined and this file is compiled and linked. */
778
 
779
#ifdef MAIN
780
 
781
#include 
782
 
783
int
784
main (void)
785
{
786
  int errn;
787
  int errnmax;
788
  const char *name;
789
  const char *msg;
790
  char *strerror ();
791
 
792
  errnmax = errno_max ();
793
  printf ("%d entries in names table.\n", num_error_names);
794
  printf ("%d entries in messages table.\n", sys_nerr);
795
  printf ("%d is max useful index.\n", errnmax);
796
 
797
  /* Keep printing values until we get to the end of *both* tables, not
798
     *either* table.  Note that knowing the maximum useful index does *not*
799
     relieve us of the responsibility of testing the return pointer for
800
     NULL. */
801
 
802
  for (errn = 0; errn <= errnmax; errn++)
803
    {
804
      name = strerrno (errn);
805
      name = (name == NULL) ? "" : name;
806
      msg = strerror (errn);
807
      msg = (msg == NULL) ? "" : msg;
808
      printf ("%-4d%-18s%s\n", errn, name, msg);
809
    }
810
 
811
  return 0;
812
}
813
 
814
#endif