sysdeps/mach/_strerror.c

   1 /* Copyright (C) 1993,95,96,97,98,2000,02 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <libintl.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <mach/error.h>
  23 #include <errorlib.h>
  24 #include <sys/param.h>
  25 #include <stdio-common/_itoa.h>
  26
  27 /* It is critical here that we always use the `dcgettext' function for
  28    the message translation.  Since <libintl.h> only defines the macro
  29    `dgettext' to use `dcgettext' for optimizing programs this is not
  30    always guaranteed.  */
  31 #ifndef dgettext
  32 # include <locale.h>            /* We need LC_MESSAGES.  */
  33 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  34 #endif
  35
  36 /* Return a string describing the errno code in ERRNUM.  */
  37 char *
  38 __strerror_r (int errnum, char *buf, size_t buflen)
  39 {
  40   int system;
  41   int sub;
  42   int code;
  43   const struct error_system *es;
  44   extern void __mach_error_map_compat (int *);
  45
  46   __mach_error_map_compat (&errnum);
  47
  48   system = err_get_system (errnum);
  49   sub = err_get_sub (errnum);
  50   code = err_get_code (errnum);
  51
  52   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  53     {
  54       /* Buffer we use to print the number in.  For a maximum size for
  55          `int' of 8 bytes we never need more than 20 digits.  */
  56       char numbuf[21];
  57       const char *unk = _("Error in unknown error system: ");
  58       const size_t unklen = strlen (unk);
  59       char *p, *q;
  60
  61       numbuf[20] = '\0';
  62       p = _itoa_word (errnum, &numbuf[20], 16, 1);
  63
  64       /* Now construct the result while taking care for the destination
  65          buffer size.  */
  66       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  67       if (unklen < buflen)
  68         memcpy (q, p, MIN (&numbuf[21] - p, buflen - unklen));
  69
  70       /* Terminate the string in any case.  */
  71       if (buflen > 0)
  72         buf[buflen - 1] = '\0';
  73
  74       return buf;
  75     }
  76
  77   es = &__mach_error_systems[system];
  78
  79   if (sub >= es->max_sub)
  80     return (char *) es->bad_sub;
  81
  82   if (code >= es->subsystem[sub].max_code)
  83     {
  84       /* Buffer we use to print the number in.  For a maximum size for
  85          `int' of 8 bytes we never need more than 20 digits.  */
  86       char numbuf[21];
  87       const char *unk = _("Unknown error ");
  88       const size_t unklen = strlen (unk);
  89       char *p, *q;
  90       size_t len = strlen (es->subsystem[sub].subsys_name);
  91
  92       numbuf[20] = '\0';
  93       p = _itoa_word (errnum, &numbuf[20], 10, 0);
  94
  95       /* Now construct the result while taking care for the destination
  96          buffer size.  */
  97       q = __mempcpy (buf, unk, MIN (unklen, buflen));
  98       if (unklen < buflen)
  99         {
 100           q = __mempcpy (q, es->subsystem[sub].subsys_name,
 101                          MIN (len, buflen - unklen));
 102           if (unklen + len < buflen)
 103             {
 104               *q++ = ' ';
 105               if (unklen + len + 1 < buflen)
 106                 memcpy (q, p,
 107                         MIN (&numbuf[21] - p, buflen - unklen - len - 1));
 108             }
 109         }
 110
 111        /* Terminate the string in any case.  */
 112       if (buflen > 0)
 113         buf[buflen - 1] = '\0';
 114
 115       return buf;
 116     }
 117
 118   return (char *) _(es->subsystem[sub].codes[code]);
 119 }
 120 libc_hidden_def (__strerror_r)
 121 weak_alias (__strerror_r, strerror_r)