sysdeps/mach/_strerror.c

   1 /* Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <libintl.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <mach/error.h>
  24 #include <errorlib.h>
  25 #include <sys/param.h>
  26 #include <stdio-common/_itoa.h>
  27
  28 /* It is critical here that we always use the `dcgettext' function for
  29    the message translation.  Since <libintl.h> only defines the macro
  30    `dgettext' to use `dcgettext' for optimizing programs this is not
  31    always guaranteed.  */
  32 #ifndef dgettext
  33 # include <locale.h>            /* We need LC_MESSAGES.  */
  34 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  35 #endif
  36
  37 /* Return a string describing the errno code in ERRNUM.  */
  38 char *
  39 __strerror_r (int errnum, char *buf, size_t buflen)
  40 {
  41   int system;
  42   int sub;
  43   int code;
  44   const struct error_system *es;
  45   extern void __mach_error_map_compat (int *);
  46
  47   __mach_error_map_compat (&errnum);
  48
  49   system = err_get_system (errnum);
  50   sub = err_get_sub (errnum);
  51   code = err_get_code (errnum);
  52
  53   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  54     {
  55       /* Buffer we use to print the number in.  For a maximum size for
  56          `int' of 8 bytes we never need more than 20 digits.  */
  57       char numbuf[21];
  58       const char *unk = _("Error in unknown error system: ");
  59       const size_t unklen = strlen (unk);
  60       char *p, *q;
  61
  62       numbuf[20] = '\0';
  63       p = _itoa_word (errnum, &numbuf[20], 16, 1);
  64
  65       /* Now construct the result while taking care for the destination
  66          buffer size.  */
  67       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  68       if (unklen < buflen)
  69         memcpy (q, p, MIN (&numbuf[21] - p, buflen - unklen));
  70
  71       /* Terminate the string in any case.  */
  72       if (buflen > 0)
  73         buf[buflen - 1] = '\0';
  74
  75       return buf;
  76     }
  77
  78   es = &__mach_error_systems[system];
  79
  80   if (sub >= es->max_sub)
  81     return (char *) es->bad_sub;
  82
  83   if (code >= es->subsystem[sub].max_code)
  84     {
  85       /* Buffer we use to print the number in.  For a maximum size for
  86          `int' of 8 bytes we never need more than 20 digits.  */
  87       char numbuf[21];
  88       const char *unk = _("Unknown error ");
  89       const size_t unklen = strlen (unk);
  90       char *p, *q;
  91       size_t len = strlen (es->subsystem[sub].subsys_name);
  92
  93       numbuf[20] = '\0';
  94       p = _itoa_word (errnum, &numbuf[20], 10, 0);
  95
  96       /* Now construct the result while taking care for the destination
  97          buffer size.  */
  98       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  99       if (unklen < buflen)
 100         {
 101           q = __mempcpy (q, es->subsystem[sub].subsys_name,
 102                          MIN (len, buflen - unklen));
 103           if (unklen + len < buflen)
 104             {
 105               *q++ = ' ';
 106               if (unklen + len + 1 < buflen)
 107                 memcpy (q, p,
 108                         MIN (&numbuf[21] - p, buflen - unklen - len - 1));
 109             }
 110         }
 111
 112        /* Terminate the string in any case.  */
 113       if (buflen > 0)
 114         buf[buflen - 1] = '\0';
 115
 116       return buf;
 117     }
 118
 119   return (char *) _(es->subsystem[sub].codes[code]);
 120 }
 121 weak_alias (__strerror_r, strerror_r)