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/* fold -- wrap each input line to fit in specified width.
Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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 2, 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by David MacKenzie, djm@gnu.ai.mit.edu. */
#include <config.h>
/* Get isblank from GNU libc. */
#define _GNU_SOURCE
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#ifndef UINT_MAX
# define UINT_MAX ((unsigned int) ~(unsigned int) 0)
#endif
#ifndef INT_MAX
# define INT_MAX ((int) (UINT_MAX >> 1))
#endif
#include "system.h"
#include "version.h"
#include "xstrtol.h"
#include "error.h"
char *xrealloc ();
char *xmalloc ();
/* The name this program was run with. */
char *program_name;
/* If nonzero, try to break on whitespace. */
static int break_spaces;
/* If nonzero, count bytes, not column positions. */
static int count_bytes;
/* If nonzero, at least one of the files we read was standard input. */
static int have_read_stdin;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output then exit. */
static int show_version;
static struct option const longopts[] =
{
{"bytes", no_argument, NULL, 'b'},
{"spaces", no_argument, NULL, 's'},
{"width", required_argument, NULL, 'w'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
"),
program_name);
printf (_("\
Wrap input lines in each FILE (standard input by default), writing to\n\
standard output.\n\
\n\
-b, --bytes count bytes rather than columns\n\
-s, --spaces break at spaces\n\
-w, --width=WIDTH use WIDTH columns instead of 80\n\
"));
}
exit (status);
}
/* Assuming the current column is COLUMN, return the column that
printing C will move the cursor to.
The first column is 0. */
static int
adjust_column (int column, char c)
{
if (!count_bytes)
{
if (c == '\b')
{
if (column > 0)
column--;
}
else if (c == '\r')
column = 0;
else if (c == '\t')
column = column + 8 - column % 8;
else /* if (isprint (c)) */
column++;
}
else
column++;
return column;
}
/* Fold file FILENAME, or standard input if FILENAME is "-",
to stdout, with maximum line length WIDTH.
Return 0 if successful, 1 if an error occurs. */
static int
fold_file (char *filename, int width)
{
FILE *istream;
register int c;
int column = 0; /* Screen column where next char will go. */
int offset_out = 0; /* Index in `line_out' for next char. */
static char *line_out = NULL;
static int allocated_out = 0;
if (!strcmp (filename, "-"))
{
istream = stdin;
have_read_stdin = 1;
}
else
istream = fopen (filename, "r");
if (istream == NULL)
{
error (0, errno, "%s", filename);
return 1;
}
while ((c = getc (istream)) != EOF)
{
if (offset_out + 1 >= allocated_out)
{
allocated_out += 1024;
line_out = xrealloc (line_out, allocated_out);
}
if (c == '\n')
{
line_out[offset_out++] = c;
fwrite (line_out, sizeof (char), (size_t) offset_out, stdout);
column = offset_out = 0;
continue;
}
rescan:
column = adjust_column (column, c);
if (column > width)
{
/* This character would make the line too long.
Print the line plus a newline, and make this character
start the next line. */
if (break_spaces)
{
/* Look for the last blank. */
int logical_end;
for (logical_end = offset_out - 1; logical_end >= 0;
logical_end--)
if (ISBLANK (line_out[logical_end]))
break;
if (logical_end >= 0)
{
int i;
/* Found a blank. Don't output the part after it. */
logical_end++;
fwrite (line_out, sizeof (char), (size_t) logical_end,
stdout);
putchar ('\n');
/* Move the remainder to the beginning of the next line.
The areas being copied here might overlap. */
memmove (line_out, line_out + logical_end,
offset_out - logical_end);
offset_out -= logical_end;
for (column = i = 0; i < offset_out; i++)
column = adjust_column (column, line_out[i]);
goto rescan;
}
}
else
{
if (offset_out == 0)
{
line_out[offset_out++] = c;
continue;
}
}
line_out[offset_out++] = '\n';
fwrite (line_out, sizeof (char), (size_t) offset_out, stdout);
column = offset_out = 0;
goto rescan;
}
line_out[offset_out++] = c;
}
if (offset_out)
fwrite (line_out, sizeof (char), (size_t) offset_out, stdout);
if (ferror (istream))
{
error (0, errno, "%s", filename);
if (strcmp (filename, "-"))
fclose (istream);
return 1;
}
if (strcmp (filename, "-") && fclose (istream) == EOF)
{
error (0, errno, "%s", filename);
return 1;
}
if (ferror (stdout))
{
error (0, errno, _("write error"));
return 1;
}
return 0;
}
void
main (int argc, char **argv)
{
int width = 80;
int i;
int optc;
int errs = 0;
program_name = argv[0];
break_spaces = count_bytes = have_read_stdin = 0;
/* Turn any numeric options into -w options. */
for (i = 1; i < argc; i++)
{
if (argv[i][0] == '-' && ISDIGIT (argv[i][1]))
{
char *s;
s = xmalloc (strlen (argv[i]) + 2);
s[0] = '-';
s[1] = 'w';
strcpy (s + 2, argv[i] + 1);
argv[i] = s;
}
}
while ((optc = getopt_long (argc, argv, "bsw:", longopts, (int *) 0))
!= EOF)
{
switch (optc)
{
case 0:
break;
case 'b': /* Count bytes rather than columns. */
count_bytes = 1;
break;
case 's': /* Break at word boundaries. */
break_spaces = 1;
break;
case 'w': /* Line width. */
{
long int tmp_long;
if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
|| tmp_long <= 0 || tmp_long > INT_MAX)
error (1, 0, _("invalid number of columns: `%s'"), optarg);
width = (int) tmp_long;
}
break;
default:
usage (1);
}
}
if (show_version)
{
printf ("fold - %s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (argc == optind)
errs |= fold_file ("-", width);
else
for (i = optind; i < argc; i++)
errs |= fold_file (argv[i], width);
if (have_read_stdin && fclose (stdin) == EOF)
error (1, errno, "-");
if (fclose (stdout) == EOF)
error (1, errno, _("write error"));
exit (errs);
}
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