misc/err.c

   1 /* 4.4BSD utility functions for error messages.
   2    Copyright (C) 1995-2016 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdarg.h>
  20 #include <err.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25
  26 #include <wchar.h>
  27 #define flockfile(s) _IO_flockfile (s)
  28 #define funlockfile(s) _IO_funlockfile (s)
  29
  30 extern char *__progname;
  31
  32 #define VA(call)                                                              \
  33 {                                                                             \
  34   va_list ap;                                                                 \
  35   va_start (ap, format);                                                      \
  36   call;                                                                       \
  37   va_end (ap);                                                                \
  38 }
  39
  40 static void
  41 convert_and_print (const char *format, __gnuc_va_list ap)
  42 {
  43 #define ALLOCA_LIMIT    2000
  44   size_t len;
  45   wchar_t *wformat = NULL;
  46   mbstate_t st;
  47   size_t res;
  48   const char *tmp;
  49
  50   if (format == NULL)
  51     return;
  52
  53   len = strlen (format) + 1;
  54
  55   do
  56     {
  57       if (len < ALLOCA_LIMIT)
  58         wformat = (wchar_t *) alloca (len * sizeof (wchar_t));
  59       else
  60         {
  61           if (wformat != NULL && len / 2 < ALLOCA_LIMIT)
  62             wformat = NULL;
  63
  64           wformat = (wchar_t *) realloc (wformat, len * sizeof (wchar_t));
  65
  66           if (wformat == NULL)
  67             {
  68               fputws_unlocked (L"out of memory\n", stderr);
  69               return;
  70             }
  71         }
  72
  73       memset (&st, '\0', sizeof (st));
  74       tmp =format;
  75     }
  76   while ((res = __mbsrtowcs (wformat, &tmp, len, &st)) == len);
  77
  78   if (res == (size_t) -1)
  79     /* The string cannot be converted.  */
  80     wformat = (wchar_t *) L"???";
  81
  82   __vfwprintf (stderr, wformat, ap);
  83 }
  84
  85 void
  86 vwarnx (const char *format, __gnuc_va_list ap)
  87 {
  88   flockfile (stderr);
  89   if (_IO_fwide (stderr, 0) > 0)
  90     {
  91       __fwprintf (stderr, L"%s: ", __progname);
  92       convert_and_print (format, ap);
  93       putwc_unlocked (L'\n', stderr);
  94     }
  95   else
  96     {
  97       fprintf (stderr, "%s: ", __progname);
  98       if (format)
  99         vfprintf (stderr, format, ap);
 100       putc_unlocked ('\n', stderr);
 101     }
 102   funlockfile (stderr);
 103 }
 104 libc_hidden_def (vwarnx)
 105
 106 void
 107 vwarn (const char *format, __gnuc_va_list ap)
 108 {
 109   int error = errno;
 110
 111   flockfile (stderr);
 112   if (_IO_fwide (stderr, 0) > 0)
 113     {
 114       __fwprintf (stderr, L"%s: ", __progname);
 115       if (format)
 116         {
 117           convert_and_print (format, ap);
 118           fputws_unlocked (L": ", stderr);
 119         }
 120       __set_errno (error);
 121       __fwprintf (stderr, L"%m\n");
 122     }
 123   else
 124     {
 125       fprintf (stderr, "%s: ", __progname);
 126       if (format)
 127         {
 128           vfprintf (stderr, format, ap);
 129           fputs_unlocked (": ", stderr);
 130         }
 131       __set_errno (error);
 132       fprintf (stderr, "%m\n");
 133     }
 134   funlockfile (stderr);
 135 }
 136 libc_hidden_def (vwarn)
 137
 138
 139 void
 140 warn (const char *format, ...)
 141 {
 142   VA (vwarn (format, ap))
 143 }
 144 libc_hidden_def (warn)
 145
 146 void
 147 warnx (const char *format, ...)
 148 {
 149   VA (vwarnx (format, ap))
 150 }
 151 libc_hidden_def (warnx)
 152
 153 void
 154 verr (int status, const char *format, __gnuc_va_list ap)
 155 {
 156   vwarn (format, ap);
 157   exit (status);
 158 }
 159 libc_hidden_def (verr)
 160
 161 void
 162 verrx (int status, const char *format, __gnuc_va_list ap)
 163 {
 164   vwarnx (format, ap);
 165   exit (status);
 166 }
 167 libc_hidden_def (verrx)
 168
 169 void
 170 err (int status, const char *format, ...)
 171 {
 172   VA (verr (status, format, ap))
 173 }
 174
 175 void
 176 errx (int status, const char *format, ...)
 177 {
 178   VA (verrx (status, format, ap))
 179 }