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<!--
libexplain - Explain errno values returned by libc functions
Copyright (C) 2009, 2010 Peter Miller
Written by Peter Miller <pmiller@opensource.org.au>
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 of the License, 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/>.
-->
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<title>
No Medium Found, 2.5
</title>
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<body>
<table width="100%" >
<tr>
<td align="left" >
<a href="250-slide.html" >Prev</a>,
<a href="index.html" >Top</a>
</td><td align="right" >
<a href="200-notes.html" >Notes</a>,
<a href="270-slide.html" >Next</a>
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<h1 align="center" >
Using the Library<br>
cat
</h1>
.nf
<table align="center" >
<tr><td>
<pre>
#include <libexplain/libexplain.h>
#include <stdlib.h>
#include <unistd.h>
static void
process(FILE *fp)
{
for (;;)
{
char buffer[4096];
size_t n = explain_fread_or_die(buffer, 1, sizeof(buffer), fp);
if (!n)
break;
explain_fwrite_or_die(buffer, 1, n, stdout);
}
}
int
main(int argc, char **argv)
{
for (;;)
{
int c = getopt(argc, argv, "o:");
if (c == EOF)
break;
switch (c)
{
case 'o':
explain_freopen_or_die(optarg, "w", stdout);
break;
default:
fprintf(stderr, "Usage: %ss [ -o <filename> ] "
"<filename>...\en", argv[0]);
return EXIT_FAILURE;
}
}
if (optind == argc)
process(stdin);
else
{
while (optind < argc)
{
FILE *fp = explain_fopen_or_die(argv[optind]++, "r");
process(fp);
explain_fclose_or_die(fp);
}
}
explain_fflush_or_die(stdout);
return EXIT_SUCCESS;
}
</pre>
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</table>
</body>
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