libexplain  1.4.D001
libexplain/ftello_or_die.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2013 Peter Miller
00004  *
00005  * This program is free software; you can redistribute it and/or modify it
00006  * under the terms of the GNU Lesser General Public License as published by
00007  * the Free Software Foundation; either version 3 of the License, or (at
00008  * your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful, but
00011  * WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
00013  * General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public License
00016  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00017  */
00018 
00019 #include <libexplain/ac/errno.h>
00020 #include <libexplain/ac/stdio.h>
00021 #include <libexplain/ac/sys/types.h>
00022 
00023 #include <libexplain/ftello.h>
00024 #include <libexplain/output.h>
00025 
00026 
00027 off_t
00028 explain_ftello_or_die(FILE *fp)
00029 {
00030     off_t           result;
00031 
00032     result = explain_ftello_on_error(fp);
00033     if (result < 0)
00034     {
00035         explain_output_exit_failure();
00036     }
00037     return result;
00038 }
00039 
00040 
00041 off_t
00042 explain_ftello_on_error(FILE *fp)
00043 {
00044     off_t           result;
00045 
00046 #ifdef HAVE_FTELLO
00047     result = ftello(fp);
00048 #else
00049     errno = ENOSYS;
00050     result = -1;
00051 #endif
00052     if (result < 0)
00053     {
00054         int             hold_errno;
00055 
00056         hold_errno = errno;
00057         explain_output_error
00058         (
00059             "%s",
00060             explain_errno_ftello(hold_errno, fp)
00061         );
00062         errno = hold_errno;
00063     }
00064     return result;
00065 }
00066 
00067 
00068 /* vim: set ts=8 sw=4 et : */