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/*
io.c -- Input/Output convenience functions;
Copyright (C) 2013, 2014, 2015 Bruno Félix Rezende Ribeiro <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file io.c
* \brief Input/Output convenience functions
*/
#include <config.h>
#include <stdio.h>
#include <sys/stat.h>
#include <assert.h>
#include <sysexits.h>
#include <error.h>
#include <stdarg.h>
#include <errno.h>
#include "i18n.h"
#include "io.h"
int
io_optimize_stream_buffer (FILE *stream, int mode)
{
/* Information about STREAM's attributes; */
struct stat stat;
/* STREAM's file descriptor number; */
int fd;
/* Assert that STREAM is not NULL. */
assert (stream != NULL);
/* Assert that MODE is valid. */
assert (mode == _IOFBF || mode == _IOLBF || mode == _IONBF);
/* Get the file descriptor associated with STREAM. Return with
failure if you cannot. */
fd = fileno (stream);
if (fd == -1) return -1;
/* Get the information about STREAM's attributes. */
if (fstat (fd, &stat) == -1) return -1;
/* Adjust buffer to the optimal block size for reading from and
writing to STREAM with MODE. */
if (setvbuf (stream, NULL, mode, stat.st_blksize) != 0) return -1;
/* Return success. */
return 0;
}
size_t
xfwrite (const void *data, size_t size, size_t count, FILE *stream)
{
/* Assert DATA is a valid pointer. */
assert (data != NULL);
/* Assert STREAM is a valid pointer. */
assert (stream != NULL);
/* Write to stream, and if occurs an error exit with failure. */
if (fwrite (data, size, count, stream) != count)
error (EX_OSERR, errno, _("%s: error writing to stream"), __func__);
/* Return the number of objects actually written. */
return count;
}
int
xputc (int c, FILE *stream)
{
/* Assert STREAM is a valid pointer. */
assert (stream != NULL);
/* Write to stream, and if occurs an error exit with failure. */
if (putc (c, stream) == EOF)
error (EX_OSERR, errno, _("%s: error writing to stream"), __func__);
/* Return the character just written. */
return c;
}
int
xfprintf (FILE *stream, const char *template, ...)
{
va_list ap; /* Argument pointer; */
int retval; /* Return value; */
/* Assert STREAM is a valid pointer. */
assert (stream != NULL);
/* Assert template is a valid string. */
assert (template != NULL);
/* Initialize argument pointer. */
va_start (ap, template);
/* Print to stream. */
retval = vfprintf (stream, template, ap);
/* If occurred an output error exit with failure. */
if (retval < 0)
error (EX_OSERR, errno, _("%s: error writing to stream"), __func__);
/* Return the number of characters just written. */
return retval;
}
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