[79e9ff]: cleanfile.c  Maximize  Restore  History

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/**
* cleanlog.c -- cleans text files with embedded control characters
* Currently only handles "CR" used for terminal updates:
* file-downloading |===== | 15%^M
* file-downloading |====== | 17%^M
* ...
* file-downloading |========================| 100%^M^J
* is transformed by retaining only the last "line", just
* as it would appear on a terminal, where each CR (^M)
* without a LF (^J) would cause the preceeding "line" to
* be overwritten.
*
* Copyright 2011 by Charles Wilson
* All rights reserved.
*
* 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/>.
*
* See the COPYING file for full license information.
*/
#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#if defined(__WIN32__) && !defined(__CYGWIN__)
# include <io.h>
# include <conio.h>
#endif
static void usage (FILE * f, char *name);
static int cleanfile (FILE * in, FILE * out);
static char *program_name;
int
main (int argc, char **argv)
{
int rc;
int ec = 0;
int c;
FILE * in = stdin;
FILE * out = stdout;
if ((program_name = strdup (argv[0])) == NULL)
{
fprintf (stderr, "%s: memory allocation error\n", argv[0]);
exit (1);
}
opterr = 0;
while ((c = getopt (argc, argv, "h")) != -1)
switch (c)
{
case 'h':
usage (stdout, program_name);
ec = 0;
goto finish;
case '?':
if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr,
"Unknown option character `\\x%x'.\n",
optopt);
ec = 2;
goto finish;
default:
fprintf (stderr, "Internal error processing options\n");
ec = 2;
goto finish;
}
if (optind < argc - 2)
{
fprintf (stderr, "Too many arguments.\n");
usage (stderr, program_name);
ec = 2;
goto finish;
}
if (optind < argc - 1)
{
if (strcmp (argv[optind], argv[optind+1]) == 0)
{
fprintf (stderr,
"Can't use same file %s as both input and output\n",
argv[optind]);
ec = 1;
goto finish;
}
out = fopen (argv[optind+1], "wb");
if (out == NULL)
{
int serrno = errno;
fprintf (stderr, "Can't open output file %s (%s)\n",
argv[optind+1], strerror(serrno));
ec = 1;
goto finish;
}
}
if (optind < argc)
{
in = fopen (argv[optind], "rb");
if (in == NULL)
{
int serrno = errno;
fprintf (stderr, "Can't open input file %s (%s)\n",
argv[optind], strerror(serrno));
ec = 1;
goto finish;
}
}
ec = cleanfile (in, out);
finish:
free (program_name);
if (out && out != stdout) fclose (out);
if (in && in != stdin) fclose (in);
return (ec);
}
static void
usage (FILE * f, char *name)
{
fprintf (f, "%s [-h] [inputfile [outputfile]]\n", name);
}
#define MAX_LINE 1024
static int
cleanfile (FILE * in, FILE * out)
{
char linebuf[MAX_LINE];
int pos = 0;
int gotCR = 0;
int ec = 0;
int c;
while (1)
{
c = getc (in);
if (c == EOF)
{
if (pos > 0)
{
if (fwrite (linebuf, sizeof (char), pos, out) != pos)
{
fprintf (stderr, "Error writing output\n");
ec = 3;
}
}
break;
}
if (c == '\r')
{
gotCR = 1;
linebuf[pos++] = c;
}
else if (c == '\n')
{
linebuf[pos++] = c;
if (fwrite (linebuf, sizeof (char), pos, out) != pos)
{
fprintf (stderr, "Error writing output\n");
ec = 3;
}
pos = 0;
gotCR = 0;
}
else
{
if (gotCR)
{
pos = 0;
gotCR = 0;
}
linebuf[pos++] = c;
}
if (pos == MAX_LINE)
{
/* line too long; just write what we have */
if (fwrite (linebuf, sizeof (char), pos, out) != pos)
{
fprintf (stderr, "Error writing output\n");
ec = 4;
}
pos = 0;
gotCR = 0;
fprintf (stderr, "Line too long...continuing\n");
}
}
return ec;
}

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