summaryrefslogtreecommitdiff
path: root/tests/strerror_r.c
blob: 0cd28ade6e60e741f92636478698f05a8d0ad866 (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
/* strerror_r.c --- POSIX compatible system error routine

   Copyright (C) 2010-2024 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2010.  */

#include <config.h>

/* Enable declaration of sys_nerr and sys_errlist in <errno.h> on NetBSD.  */
#define _NETBSD_SOURCE 1

/* Specification.  */
#include <string.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#if !HAVE_SNPRINTF
# include <stdarg.h>
#endif

#include "strerror-override.h"

#if STRERROR_R_CHAR_P

# if HAVE___XPG_STRERROR_R
_GL_EXTERN_C int __xpg_strerror_r (int errnum, char *buf, size_t buflen);
# endif

#elif HAVE_DECL_STRERROR_R

/* The system's strerror_r function's API is OK, except that its third argument
   is 'int', not 'size_t', or its return type is wrong.  */

# include <limits.h>

#else

/* Use the system's strerror().  Exclude glibc and cygwin because the
   system strerror_r has the wrong return type, and cygwin 1.7.9
   strerror_r clobbers strerror.  */
# undef strerror

# if defined __NetBSD__ || defined __hpux || (defined _WIN32 && !defined __CYGWIN__) || defined __sgi || (defined __sun && !defined _LP64) || defined __CYGWIN__

/* No locking needed.  */

/* Get catgets internationalization functions.  */
#  if HAVE_CATGETS
#   include <nl_types.h>
#  endif

#ifdef __cplusplus
extern "C" {
#endif

/* Get sys_nerr, sys_errlist on HP-UX (otherwise only declared in C++ mode).
   Get sys_nerr, sys_errlist on IRIX (otherwise only declared with _SGIAPI).  */
#  if defined __hpux || defined __sgi
extern int sys_nerr;
extern char *sys_errlist[];
#  endif

/* Get sys_nerr on Solaris.  */
#  if defined __sun && !defined _LP64
extern int sys_nerr;
#  endif

#ifdef __cplusplus
}
#endif

# else

#  include "glthread/lock.h"

/* This lock protects the buffer returned by strerror().  We assume that
   no other uses of strerror() exist in the program.  */
gl_lock_define_initialized(static, strerror_lock)

# endif

#endif

/* On MSVC, there is no snprintf() function, just a _snprintf().
   It is of lower quality, but sufficient for the simple use here.
   We only have to make sure to NUL terminate the result (_snprintf
   does not NUL terminate, like strncpy).  */
#if !HAVE_SNPRINTF
static int
local_snprintf (char *buf, size_t buflen, const char *format, ...)
{
  va_list args;
  int result;

  va_start (args, format);
  result = _vsnprintf (buf, buflen, format, args);
  va_end (args);
  if (buflen > 0 && (result < 0 || result >= buflen))
    buf[buflen - 1] = '\0';
  return result;
}
# undef snprintf
# define snprintf local_snprintf
#endif

/* Copy as much of MSG into BUF as possible, without corrupting errno.
   Return 0 if MSG fit in BUFLEN, otherwise return ERANGE.  */
static int
safe_copy (char *buf, size_t buflen, const char *msg)
{
  size_t len = strlen (msg);
  size_t moved = len < buflen ? len : buflen - 1;

  /* Although POSIX lets memmove corrupt errno, we don't
     know of any implementation where this is a real problem.  */
  memmove (buf, msg, moved);
  buf[moved] = '\0';
  return len < buflen ? 0 : ERANGE;
}


int
strerror_r (int errnum, char *buf, size_t buflen)
#undef strerror_r
{
  /* Filter this out now, so that rest of this replacement knows that
     there is room for a non-empty message and trailing NUL.  */
  if (buflen <= 1)
    {
      if (buflen)
        *buf = '\0';
      return ERANGE;
    }
  *buf = '\0';

  /* Check for gnulib overrides.  */
  {
    char const *msg = strerror_override (errnum);

    if (msg)
      return safe_copy (buf, buflen, msg);
  }

  {
    int ret;
    int saved_errno = errno;

#if STRERROR_R_CHAR_P

    {
      ret = 0;

# if HAVE___XPG_STRERROR_R
      ret = __xpg_strerror_r (errnum, buf, buflen);
      /* ret is 0 upon success, or EINVAL or ERANGE upon failure.  */
# endif

      if (!*buf)
        {
          /* glibc 2.13 ... 2.34 (at least) don't touch buf upon failure.
             Therefore we have to fall back to strerror_r which, for valid
             errnum, returns a thread-safe untruncated string.  For invalid
             errnum, though, it returns a truncated string, which does not
             allow us to determine whether to return ERANGE or 0.  Thus we
             need to pass a sufficiently large buffer.  */
          char stackbuf[80];
          char *errstring = strerror_r (errnum, stackbuf, sizeof stackbuf);
          ret = errstring ? safe_copy (buf, buflen, errstring) : errno;
        }
    }

#elif HAVE_DECL_STRERROR_R

    if (buflen > INT_MAX)
      buflen = INT_MAX;

# ifdef __hpux
    /* On HP-UX 11.31, strerror_r always fails when buflen < 80; it
       also fails to change buf on EINVAL.  */
    {
      char stackbuf[80];

      if (buflen < sizeof stackbuf)
        {
          ret = strerror_r (errnum, stackbuf, sizeof stackbuf);
          if (ret == 0)
            ret = safe_copy (buf, buflen, stackbuf);
        }
      else
        ret = strerror_r (errnum, buf, buflen);
    }
# else
    ret = strerror_r (errnum, buf, buflen);

    /* Some old implementations may return (-1, EINVAL) instead of EINVAL.
       But on Haiku, valid error numbers are negative.  */
#  if !defined __HAIKU__
    if (ret < 0)
      ret = errno;
#  endif
# endif

# if defined _AIX || defined __HAIKU__
    /* AIX and Haiku return 0 rather than ERANGE when truncating strings; try
       again until we are sure we got the entire string.  */
    if (!ret && strlen (buf) == buflen - 1)
      {
        char stackbuf[STACKBUF_LEN];
        size_t len;
        strerror_r (errnum, stackbuf, sizeof stackbuf);
        len = strlen (stackbuf);
        /* STACKBUF_LEN should have been large enough.  */
        if (len + 1 == sizeof stackbuf)
          abort ();
        if (buflen <= len)
          ret = ERANGE;
      }
# else
    /* Solaris 10 does not populate buf on ERANGE.  OpenBSD 4.7
       truncates early on ERANGE rather than return a partial integer.
       We prefer the maximal string.  We set buf[0] earlier, and we
       know of no implementation that modifies buf to be an
       unterminated string, so this strlen should be portable in
       practice (rather than pulling in a safer strnlen).  */
    if (ret == ERANGE && strlen (buf) < buflen - 1)
      {
        char stackbuf[STACKBUF_LEN];

        /* STACKBUF_LEN should have been large enough.  */
        if (strerror_r (errnum, stackbuf, sizeof stackbuf) == ERANGE)
          abort ();
        safe_copy (buf, buflen, stackbuf);
      }
# endif

#else /* strerror_r is not declared.  */

    /* Try to do what strerror (errnum) does, but without clobbering the
       buffer used by strerror().  */

# if defined __NetBSD__ || defined __hpux || (defined _WIN32 && !defined __CYGWIN__) || defined __CYGWIN__ /* NetBSD, HP-UX, native Windows, Cygwin */

    /* NetBSD:         sys_nerr, sys_errlist are declared through _NETBSD_SOURCE
                       and <errno.h> above.
       HP-UX:          sys_nerr, sys_errlist are declared explicitly above.
       native Windows: sys_nerr, sys_errlist are declared in <stdlib.h>.
       Cygwin:         sys_nerr, sys_errlist are declared in <errno.h>.  */
    if (errnum >= 0 && errnum < sys_nerr)
      {
#  if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
#   if defined __NetBSD__
        nl_catd catd = catopen ("libc", NL_CAT_LOCALE);
        const char *errmsg =
          (catd != (nl_catd)-1
           ? catgets (catd, 1, errnum, sys_errlist[errnum])
           : sys_errlist[errnum]);
#   endif
#   if defined __hpux
        nl_catd catd = catopen ("perror", NL_CAT_LOCALE);
        const char *errmsg =
          (catd != (nl_catd)-1
           ? catgets (catd, 1, 1 + errnum, sys_errlist[errnum])
           : sys_errlist[errnum]);
#   endif
#  else
        const char *errmsg = sys_errlist[errnum];
#  endif
        if (errmsg == NULL || *errmsg == '\0')
          ret = EINVAL;
        else
          ret = safe_copy (buf, buflen, errmsg);
#  if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
        if (catd != (nl_catd)-1)
          catclose (catd);
#  endif
      }
    else
      ret = EINVAL;

# elif defined __sgi || (defined __sun && !defined _LP64) /* IRIX, Solaris <= 9 32-bit */

    /* For a valid error number, the system's strerror() function returns
       a pointer to a not copied string, not to a buffer.  */
    if (errnum >= 0 && errnum < sys_nerr)
      {
        char *errmsg = strerror (errnum);

        if (errmsg == NULL || *errmsg == '\0')
          ret = EINVAL;
        else
          ret = safe_copy (buf, buflen, errmsg);
      }
    else
      ret = EINVAL;

# else

    gl_lock_lock (strerror_lock);

    {
      char *errmsg = strerror (errnum);

      /* For invalid error numbers, strerror() on
           - IRIX 6.5 returns NULL,
           - HP-UX 11 returns an empty string.  */
      if (errmsg == NULL || *errmsg == '\0')
        ret = EINVAL;
      else
        ret = safe_copy (buf, buflen, errmsg);
    }

    gl_lock_unlock (strerror_lock);

# endif

#endif

#if defined _WIN32 && !defined __CYGWIN__
    /* MSVC 14 defines names for many error codes in the range 100..140,
       but _sys_errlist contains strings only for the error codes
       < _sys_nerr = 43.  */
    if (ret == EINVAL)
      {
        const char *errmsg;

        switch (errnum)
          {
          case 100 /* EADDRINUSE */:
            errmsg = "Address already in use";
            break;
          case 101 /* EADDRNOTAVAIL */:
            errmsg = "Cannot assign requested address";
            break;
          case 102 /* EAFNOSUPPORT */:
            errmsg = "Address family not supported by protocol";
            break;
          case 103 /* EALREADY */:
            errmsg = "Operation already in progress";
            break;
          case 105 /* ECANCELED */:
            errmsg = "Operation canceled";
            break;
          case 106 /* ECONNABORTED */:
            errmsg = "Software caused connection abort";
            break;
          case 107 /* ECONNREFUSED */:
            errmsg = "Connection refused";
            break;
          case 108 /* ECONNRESET */:
            errmsg = "Connection reset by peer";
            break;
          case 109 /* EDESTADDRREQ */:
            errmsg = "Destination address required";
            break;
          case 110 /* EHOSTUNREACH */:
            errmsg = "No route to host";
            break;
          case 112 /* EINPROGRESS */:
            errmsg = "Operation now in progress";
            break;
          case 113 /* EISCONN */:
            errmsg = "Transport endpoint is already connected";
            break;
          case 114 /* ELOOP */:
            errmsg = "Too many levels of symbolic links";
            break;
          case 115 /* EMSGSIZE */:
            errmsg = "Message too long";
            break;
          case 116 /* ENETDOWN */:
            errmsg = "Network is down";
            break;
          case 117 /* ENETRESET */:
            errmsg = "Network dropped connection on reset";
            break;
          case 118 /* ENETUNREACH */:
            errmsg = "Network is unreachable";
            break;
          case 119 /* ENOBUFS */:
            errmsg = "No buffer space available";
            break;
          case 123 /* ENOPROTOOPT */:
            errmsg = "Protocol not available";
            break;
          case 126 /* ENOTCONN */:
            errmsg = "Transport endpoint is not connected";
            break;
          case 128 /* ENOTSOCK */:
            errmsg = "Socket operation on non-socket";
            break;
          case 129 /* ENOTSUP */:
            errmsg = "Not supported";
            break;
          case 130 /* EOPNOTSUPP */:
            errmsg = "Operation not supported";
            break;
          case 132 /* EOVERFLOW */:
            errmsg = "Value too large for defined data type";
            break;
          case 133 /* EOWNERDEAD */:
            errmsg = "Owner died";
            break;
          case 134 /* EPROTO */:
            errmsg = "Protocol error";
            break;
          case 135 /* EPROTONOSUPPORT */:
            errmsg = "Protocol not supported";
            break;
          case 136 /* EPROTOTYPE */:
            errmsg = "Protocol wrong type for socket";
            break;
          case 138 /* ETIMEDOUT */:
            errmsg = "Connection timed out";
            break;
          case 140 /* EWOULDBLOCK */:
            errmsg = "Operation would block";
            break;
          default:
            errmsg = NULL;
            break;
          }
        if (errmsg != NULL)
          ret = safe_copy (buf, buflen, errmsg);
      }
#endif

    if (ret == EINVAL && !*buf)
      {
#if defined __HAIKU__
        /* For consistency with perror().  */
        snprintf (buf, buflen, "Unknown Application Error (%d)", errnum);
#else
        snprintf (buf, buflen, "Unknown error %d", errnum);
#endif
      }

    errno = saved_errno;
    return ret;
  }
}