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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [libiberty/] [strerror.c] - Blame information for rev 158

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1 21 khays 
/* 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 <stdio.h>
21 
#include <errno.h>
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 <stdlib.h>
32 
#else
33 
extern PTR malloc ();
34 
#endif
35 
 
36 
#ifdef HAVE_STRING_H
37 
#include <string.h>
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 <errno.h> */
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 
 
472 
extern int sys_nerr;
473 
extern char *sys_errlist[];
474 
 
475 
#endif
476 
 
477 
/*
478 
 
479 
NAME
480 
 
481 
        init_error_tables -- initialize the name and message tables
482 
 
483 
SYNOPSIS
484 
 
485 
        static void init_error_tables ();
486 
 
487 
DESCRIPTION
488 
 
489 
        Using the error_table, which is initialized at compile time, generate
490 
        the error_names and the sys_errlist (if needed) tables, which are
491 
        indexed at runtime by a specific errno value.
492 
 
493 
BUGS
494 
 
495 
        The initialization of the tables may fail under low memory conditions,
496 
        in which case we don't do anything particularly useful, but we don't
497 
        bomb either.  Who knows, it might succeed at a later point if we free
498 
        some memory in the meantime.  In any case, the other routines know
499 
        how to deal with lack of a table after trying to initialize it.  This
500 
        may or may not be considered to be a bug, that we don't specifically
501 
        warn about this particular failure mode.
502 
 
503 
*/
504 
 
505 
static void
506 
init_error_tables (void)
507 
{
508 
  const struct error_info *eip;
509 
  int nbytes;
510 
 
511 
  /* If we haven't already scanned the error_table once to find the maximum
512 
     errno value, then go find it now. */
513 
 
514 
  if (num_error_names == 0)
515 
    {
516 
      for (eip = error_table; eip -> name != NULL; eip++)
517 
        {
518 
          if (eip -> value >= num_error_names)
519 
            {
520 
              num_error_names = eip -> value + 1;
521 
            }
522 
        }
523 
    }
524 
 
525 
  /* Now attempt to allocate the error_names table, zero it out, and then
526 
     initialize it from the statically initialized error_table. */
527 
 
528 
  if (error_names == NULL)
529 
    {
530 
      nbytes = num_error_names * sizeof (char *);
531 
      if ((error_names = (const char **) malloc (nbytes)) != NULL)
532 
        {
533 
          memset (error_names, 0, nbytes);
534 
          for (eip = error_table; eip -> name != NULL; eip++)
535 
            {
536 
              error_names[eip -> value] = eip -> name;
537 
            }
538 
        }
539 
    }
540 
 
541 
#ifndef HAVE_SYS_ERRLIST
542 
 
543 
  /* Now attempt to allocate the sys_errlist table, zero it out, and then
544 
     initialize it from the statically initialized error_table. */
545 
 
546 
  if (sys_errlist == NULL)
547 
    {
548 
      nbytes = num_error_names * sizeof (char *);
549 
      if ((sys_errlist = (const char **) malloc (nbytes)) != NULL)
550 
        {
551 
          memset (sys_errlist, 0, nbytes);
552 
          sys_nerr = num_error_names;
553 
          for (eip = error_table; eip -> name != NULL; eip++)
554 
            {
555 
              sys_errlist[eip -> value] = eip -> msg;
556 
            }
557 
        }
558 
    }
559 
 
560 
#endif
561 
 
562 
}
563 
 
564 
/*
565 
 
566 
 
567 
@deftypefn Extension int errno_max (void)
568 
 
569 
Returns the maximum @code{errno} value for which a corresponding
570 
symbolic name or message is available.  Note that in the case where we
571 
use the @code{sys_errlist} supplied by the system, it is possible for
572 
there to be more symbolic names than messages, or vice versa.  In
573 
fact, the manual page for @code{perror(3C)} explicitly warns that one
574 
should check the size of the table (@code{sys_nerr}) before indexing
575 
it, since new error codes may be added to the system before they are
576 
added to the table.  Thus @code{sys_nerr} might be smaller than value
577 
implied by the largest @code{errno} value defined in @code{<errno.h>}.
578 
 
579 
We return the maximum value that can be used to obtain a meaningful
580 
symbolic name or message.
581 
 
582 
@end deftypefn
583 
 
584 
*/
585 
 
586 
int
587 
errno_max (void)
588 
{
589 
  int maxsize;
590 
 
591 
  if (error_names == NULL)
592 
    {
593 
      init_error_tables ();
594 
    }
595 
  maxsize = MAX (sys_nerr, num_error_names);
596 
  return (maxsize - 1);
597 
}
598 
 
599 
#ifndef HAVE_STRERROR
600 
 
601 
/*
602 
 
603 
@deftypefn Supplemental char* strerror (int @var{errnoval})
604 
 
605 
Maps an @code{errno} number to an error message string, the contents
606 
of which are implementation defined.  On systems which have the
607 
external variables @code{sys_nerr} and @code{sys_errlist}, these
608 
strings will be the same as the ones used by @code{perror}.
609 
 
610 
If the supplied error number is within the valid range of indices for
611 
the @code{sys_errlist}, but no message is available for the particular
612 
error number, then returns the string @samp{Error @var{num}}, where
613 
@var{num} is the error number.
614 
 
615 
If the supplied error number is not a valid index into
616 
@code{sys_errlist}, returns @code{NULL}.
617 
 
618 
The returned string is only guaranteed to be valid only until the
619 
next call to @code{strerror}.
620 
 
621 
@end deftypefn
622 
 
623 
*/
624 
 
625 
char *
626 
strerror (int errnoval)
627 
{
628 
  const char *msg;
629 
  static char buf[32];
630 
 
631 
#ifndef HAVE_SYS_ERRLIST
632 
 
633 
  if (error_names == NULL)
634 
    {
635 
      init_error_tables ();
636 
    }
637 
 
638 
#endif
639 
 
640 
  if ((errnoval < 0) || (errnoval >= sys_nerr))
641 
    {
642 
#ifdef EVMSERR
643 
      if (errnoval == evmserr.value)
644 
        msg = evmserr.msg;
645 
      else
646 
#endif
647 
      /* Out of range, just return NULL */
648 
      msg = NULL;
649 
    }
650 
  else if ((sys_errlist == NULL) || (sys_errlist[errnoval] == NULL))
651 
    {
652 
      /* In range, but no sys_errlist or no entry at this index. */
653 
      sprintf (buf, "Error %d", errnoval);
654 
      msg = buf;
655 
    }
656 
  else
657 
    {
658 
      /* In range, and a valid message.  Just return the message. */
659 
      msg = (char *) sys_errlist[errnoval];
660 
    }
661 
 
662 
  return (msg);
663 
}
664 
 
665 
#endif  /* ! HAVE_STRERROR */
666 
 
667 
 
668 
/*
669 
 
670 
@deftypefn Replacement {const char*} strerrno (int @var{errnum})
671 
 
672 
Given an error number returned from a system call (typically returned
673 
in @code{errno}), returns a pointer to a string containing the
674 
symbolic name of that error number, as found in @code{<errno.h>}.
675 
 
676 
If the supplied error number is within the valid range of indices for
677 
symbolic names, but no name is available for the particular error
678 
number, then returns the string @samp{Error @var{num}}, where @var{num}
679 
is the error number.
680 
 
681 
If the supplied error number is not within the range of valid
682 
indices, then returns @code{NULL}.
683 
 
684 
The contents of the location pointed to are only guaranteed to be
685 
valid until the next call to @code{strerrno}.
686 
 
687 
@end deftypefn
688 
 
689 
*/
690 
 
691 
const char *
692 
strerrno (int errnoval)
693 
{
694 
  const char *name;
695 
  static char buf[32];
696 
 
697 
  if (error_names == NULL)
698 
    {
699 
      init_error_tables ();
700 
    }
701 
 
702 
  if ((errnoval < 0) || (errnoval >= num_error_names))
703 
    {
704 
#ifdef EVMSERR
705 
      if (errnoval == evmserr.value)
706 
        name = evmserr.name;
707 
      else
708 
#endif
709 
      /* Out of range, just return NULL */
710 
      name = NULL;
711 
    }
712 
  else if ((error_names == NULL) || (error_names[errnoval] == NULL))
713 
    {
714 
      /* In range, but no error_names or no entry at this index. */
715 
      sprintf (buf, "Error %d", errnoval);
716 
      name = (const char *) buf;
717 
    }
718 
  else
719 
    {
720 
      /* In range, and a valid name.  Just return the name. */
721 
      name = error_names[errnoval];
722 
    }
723 
 
724 
  return (name);
725 
}
726 
 
727 
/*
728 
 
729 
@deftypefn Extension int strtoerrno (const char *@var{name})
730 
 
731 
Given the symbolic name of a error number (e.g., @code{EACCES}), map it
732 
to an errno value.  If no translation is found, returns 0.
733 
 
734 
@end deftypefn
735 
 
736 
*/
737 
 
738 
int
739 
strtoerrno (const char *name)
740 
{
741 
  int errnoval = 0;
742 
 
743 
  if (name != NULL)
744 
    {
745 
      if (error_names == NULL)
746 
        {
747 
          init_error_tables ();
748 
        }
749 
      for (errnoval = 0; errnoval < num_error_names; errnoval++)
750 
        {
751 
          if ((error_names[errnoval] != NULL) &&
752 
              (strcmp (name, error_names[errnoval]) == 0))
753 
            {
754 
              break;
755 
            }
756 
        }
757 
      if (errnoval == num_error_names)
758 
        {
759 
#ifdef EVMSERR
760 
          if (strcmp (name, evmserr.name) == 0)
761 
            errnoval = evmserr.value;
762 
          else
763 
#endif
764 
          errnoval = 0;
765 
        }
766 
    }
767 
  return (errnoval);
768 
}
769 
 
770 
 
771 
/* A simple little main that does nothing but print all the errno translations
772 
   if MAIN is defined and this file is compiled and linked. */
773 
 
774 
#ifdef MAIN
775 
 
776 
#include <stdio.h>
777 
 
778 
int
779 
main (void)
780 
{
781 
  int errn;
782 
  int errnmax;
783 
  const char *name;
784 
  const char *msg;
785 
  char *strerror ();
786 
 
787 
  errnmax = errno_max ();
788 
  printf ("%d entries in names table.\n", num_error_names);
789 
  printf ("%d entries in messages table.\n", sys_nerr);
790 
  printf ("%d is max useful index.\n", errnmax);
791 
 
792 
  /* Keep printing values until we get to the end of *both* tables, not
793 
     *either* table.  Note that knowing the maximum useful index does *not*
794 
     relieve us of the responsibility of testing the return pointer for
795 
     NULL. */
796 
 
797 
  for (errn = 0; errn <= errnmax; errn++)
798 
    {
799 
      name = strerrno (errn);
800 
      name = (name == NULL) ? "<NULL>" : name;
801 
      msg = strerror (errn);
802 
      msg = (msg == NULL) ? "<NULL>" : msg;
803 
      printf ("%-4d%-18s%s\n", errn, name, msg);
804 
    }
805 
 
806 
  return 0;
807 
}
808 
 
809 
#endif

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