sysdeps/mach/_strerror.c

   1 /* Copyright (C) 1993-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <libintl.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <mach/error.h>
  22 #include <errorlib.h>
  23 #include <sys/param.h>
  24 #include <_itoa.h>
  25
  26 /* It is critical here that we always use the `dcgettext' function for
  27    the message translation.  Since <libintl.h> only defines the macro
  28    `dgettext' to use `dcgettext' for optimizing programs this is not
  29    always guaranteed.  */
  30 #ifndef dgettext
  31 # include <locale.h>            /* We need LC_MESSAGES.  */
  32 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  33 #endif
  34
  35 /* Return a string describing the errno code in ERRNUM.  */
  36 char *
  37 __strerror_r (int errnum, char *buf, size_t buflen)
  38 {
  39   int system;
  40   int sub;
  41   int code;
  42   const struct error_system *es;
  43   extern void __mach_error_map_compat (int *);
  44
  45   __mach_error_map_compat (&errnum);
  46
  47   system = err_get_system (errnum);
  48   sub = err_get_sub (errnum);
  49   code = err_get_code (errnum);
  50
  51   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  52     {
  53       /* Buffer we use to print the number in.  For a maximum size for
  54          `int' of 8 bytes we never need more than 20 digits.  */
  55       char numbuf[21];
  56       const char *unk = _("Error in unknown error system: ");
  57       const size_t unklen = strlen (unk);
  58       char *p, *q;
  59
  60       numbuf[20] = '\0';
  61       p = _itoa_word (errnum, &numbuf[20], 16, 1);
  62
  63       /* Now construct the result while taking care for the destination
  64          buffer size.  */
  65       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  66       if (unklen < buflen)
  67         memcpy (q, p, MIN (&numbuf[21] - p, buflen - unklen));
  68
  69       /* Terminate the string in any case.  */
  70       if (buflen > 0)
  71         buf[buflen - 1] = '\0';
  72
  73       return buf;
  74     }
  75
  76   es = &__mach_error_systems[system];
  77
  78   if (sub >= es->max_sub)
  79     return (char *) es->bad_sub;
  80
  81   if (code >= es->subsystem[sub].max_code)
  82     {
  83       /* Buffer we use to print the number in.  For a maximum size for
  84          `int' of 8 bytes we never need more than 20 digits.  */
  85       char numbuf[21];
  86       const char *unk = _("Unknown error ");
  87       const size_t unklen = strlen (unk);
  88       char *p, *q;
  89       size_t len = strlen (es->subsystem[sub].subsys_name);
  90
  91       numbuf[20] = '\0';
  92       p = _itoa_word (errnum, &numbuf[20], 10, 0);
  93
  94       /* Now construct the result while taking care for the destination
  95          buffer size.  */
  96       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  97       if (unklen < buflen)
  98         {
  99           q = __mempcpy (q, es->subsystem[sub].subsys_name,
 100                          MIN (len, buflen - unklen));
 101           if (unklen + len < buflen)
 102             {
 103               *q++ = ' ';
 104               if (unklen + len + 1 < buflen)
 105                 memcpy (q, p,
 106                         MIN (&numbuf[21] - p, buflen - unklen - len - 1));
 107             }
 108         }
 109
 110        /* Terminate the string in any case.  */
 111       if (buflen > 0)
 112         buf[buflen - 1] = '\0';
 113
 114       return buf;
 115     }
 116
 117   return (char *) _(es->subsystem[sub].codes[code]);
 118 }
 119 libc_hidden_def (__strerror_r)
 120 weak_alias (__strerror_r, strerror_r)