libexplain  1.4.D001
libexplain/vsprintf_or_die.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2010-2013 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/stdarg.h>
00021 #include <libexplain/ac/stdio.h>
00022 
00023 #include <libexplain/output.h>
00024 #include <libexplain/vsprintf.h>
00025 
00026 
00027 #undef vsprintf
00028 
00029 
00030 int
00031 explain_vsprintf_or_die(char *data, const char *format, va_list ap)
00032 {
00033     int             result;
00034 
00035     result = explain_vsprintf_on_error(data, format, ap);
00036     if (result < 0)
00037     {
00038         explain_output_exit_failure();
00039     }
00040     return result;
00041 }
00042 
00043 
00044 int
00045 explain_vsprintf_on_error(char *data, const char *format, va_list ap)
00046 {
00047     int             result;
00048     int             hold_errno;
00049 
00050     hold_errno = errno;
00051     errno = EINVAL;
00052     result = vsprintf(data, format, ap);
00053     if (result < 0)
00054     {
00055         hold_errno = errno;
00056         explain_output_message
00057         (
00058             explain_errno_vsprintf(hold_errno, data, format, ap)
00059         );
00060     }
00061     errno = hold_errno;
00062     return result;
00063 }
00064 
00065 
00066 /* vim: set ts=8 sw=4 et : */