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OS/2 Shareware BBS: 11 Util
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txtut122.zip
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textutil
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split.c
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1998-04-11
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/* split.c -- split a file into pieces.
Copyright (C) 88, 91, 95, 1996 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. */
/* By tege@sics.se, with rms.
To do:
* Implement -t CHAR or -t REGEX to specify break characters other
than newline. */
#include <config.h>
#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 "error.h"
#include "xstrtol.h"
char *xmalloc ();
int full_write ();
int safe_read ();
/* The name this program was run with. */
char *program_name;
/* Base name of output files. */
static char *outfile;
/* Pointer to the end of the prefix in OUTFILE.
Suffixes are inserted here. */
static char *outfile_mid;
/* Pointer to the end of OUTFILE. */
static char *outfile_end;
/* Name of input file. May be "-". */
static char *infile;
/* Descriptor on which input file is open. */
static int input_desc;
/* Descriptor on which output file is open. */
static int output_desc;
/* 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;
/* If nonzero, print a diagnostic on standard error just before each
output file is opened. */
static int verbose;
static struct option const longopts[] =
{
{"bytes", required_argument, NULL, 'b'},
{"lines", required_argument, NULL, 'l'},
{"line-bytes", required_argument, NULL, 'C'},
{"verbose", no_argument, NULL, 2},
{"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] [INPUT [PREFIX]]\n\
"),
program_name);
printf (_("\
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default\n\
PREFIX is `x'. With no INPUT, or when INPUT is -, read standard input.\n\
\n\
-b, --bytes=SIZE put SIZE bytes per output file\n\
-C, --line-bytes=SIZE put at most SIZE bytes of lines per output file\n\
-l, --lines=NUMBER put NUMBER lines per output file\n\
-NUMBER same as -l NUMBER\n\
--verbose print a diagnostic to standard error just\n\
before each output file is opened\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.\n\
"));
puts (_("\nReport bugs to textutils-bugs@gnu.ai.mit.edu"));
}
exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* Compute the next sequential output file name suffix and store it
into the string `outfile' at the position pointed to by `outfile_mid'. */
static void
next_file_name (void)
{
int x;
char *ne;
unsigned int i;
static int first_call = 1;
/* Status for outfile name generation. */
static unsigned outfile_count = 0;
static unsigned outfile_name_limit = 25 * 26;
static unsigned outfile_name_generation = 1;
if (!first_call)
outfile_count++;
first_call = 0;
if (outfile_count < outfile_name_limit)
{
for (ne = outfile_end - 1; ; ne--)
{
x = *ne;
if (x != 'z')
break;
*ne = 'a';
}
*ne = x + 1;
return;
}
outfile_count = 0;
outfile_name_limit *= 26;
outfile_name_generation++;
*outfile_mid++ = 'z';
for (i = 0; i <= outfile_name_generation; i++)
outfile_mid[i] = 'a';
outfile_end += 2;
}
/* Write BYTES bytes at BP to an output file.
If NEW_FILE_FLAG is nonzero, open the next output file.
Otherwise add to the same output file already in use. */
static void
cwrite (int new_file_flag, const char *bp, int bytes)
{
if (new_file_flag)
{
if (output_desc >= 0 && close (output_desc) < 0)
error (EXIT_FAILURE, errno, "%s", outfile);
next_file_name ();
if (verbose)
fprintf (stderr, _("creating file `%s'\n"), outfile);
output_desc = open (outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (output_desc < 0)
error (EXIT_FAILURE, errno, "%s", outfile);
}
if (full_write (output_desc, bp, bytes) < 0)
error (EXIT_FAILURE, errno, "%s", outfile);
}
/* Read NCHARS bytes from the input file into BUF.
Return the number of bytes successfully read.
If this is less than NCHARS, do not call `stdread' again. */
static int
stdread (char *buf, int nchars)
{
int n_read;
int to_be_read = nchars;
while (to_be_read)
{
n_read = safe_read (input_desc, buf, to_be_read);
if (n_read < 0)
return -1;
if (n_read == 0)
break;
to_be_read -= n_read;
buf += n_read;
}
return nchars - to_be_read;
}
/* Split into pieces of exactly NCHARS bytes.
Use buffer BUF, whose size is BUFSIZE. */
static void
bytes_split (int nchars, char *buf, int bufsize)
{
int n_read;
int new_file_flag = 1;
int to_read;
int to_write = nchars;
char *bp_out;
do
{
n_read = stdread (buf, bufsize);
if (n_read < 0)
error (EXIT_FAILURE, errno, "%s", infile);
bp_out = buf;
to_read = n_read;
for (;;)
{
if (to_read < to_write)
{
if (to_read) /* do not write 0 bytes! */
{
cwrite (new_file_flag, bp_out, to_read);
to_write -= to_read;
new_file_flag = 0;
}
break;
}
else
{
cwrite (new_file_flag, bp_out, to_write);
bp_out += to_write;
to_read -= to_write;
new_file_flag = 1;
to_write = nchars;
}
}
}
while (n_read == bufsize);
}
/* Split into pieces of exactly NLINES lines.
Use buffer BUF, whose size is BUFSIZE. */
static void
lines_split (int nlines, char *buf, int bufsize)
{
int n_read;
char *bp, *bp_out, *eob;
int new_file_flag = 1;
int n = 0;
do
{
n_read = stdread (buf, bufsize);
if (n_read < 0)
error (EXIT_FAILURE, errno, "%s", infile);
bp = bp_out = buf;
eob = bp + n_read;
*eob = '\n';
for (;;)
{
while (*bp++ != '\n')
; /* this semicolon takes most of the time */
if (bp > eob)
{
if (eob != bp_out) /* do not write 0 bytes! */
{
cwrite (new_file_flag, bp_out, eob - bp_out);
new_file_flag = 0;
}
break;
}
else
if (++n >= nlines)
{
cwrite (new_file_flag, bp_out, bp - bp_out);
bp_out = bp;
new_file_flag = 1;
n = 0;
}
}
}
while (n_read == bufsize);
}
/* Split into pieces that are as large as possible while still not more
than NCHARS bytes, and are split on line boundaries except
where lines longer than NCHARS bytes occur. */
static void
line_bytes_split (int nchars)
{
int n_read;
char *bp;
int eof = 0;
int n_buffered = 0;
char *buf = (char *) xmalloc (nchars);
do
{
/* Fill up the full buffer size from the input file. */
n_read = stdread (buf + n_buffered, nchars - n_buffered);
if (n_read < 0)
error (EXIT_FAILURE, errno, "%s", infile);
n_buffered += n_read;
if (n_buffered != nchars)
eof = 1;
/* Find where to end this chunk. */
bp = buf + n_buffered;
if (n_buffered == nchars)
{
while (bp > buf && bp[-1] != '\n')
bp--;
}
/* If chunk has no newlines, use all the chunk. */
if (bp == buf)
bp = buf + n_buffered;
/* Output the chars as one output file. */
cwrite (1, buf, bp - buf);
/* Discard the chars we just output; move rest of chunk
down to be the start of the next chunk. Source and
destination probably overlap. */
n_buffered -= bp - buf;
if (n_buffered > 0)
memmove (buf, bp, n_buffered);
}
while (!eof);
free (buf);
}
int
main (int argc, char **argv)
{
struct stat stat_buf;
int num; /* numeric argument from command line */
enum
{
type_undef, type_bytes, type_byteslines, type_lines, type_digits
} split_type = type_undef;
int in_blk_size; /* optimal block size of input file device */
char *buf; /* file i/o buffer */
int accum = 0;
char *outbase;
int c;
int digits_optind = 0;
#ifdef __EMX__
_wildcard(&argc, &argv);
#endif
program_name = argv[0];
#ifndef __EMX__
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
#endif
/* Parse command line options. */
infile = "-";
outbase = "x";
while (1)
{
/* This is the argv-index of the option we will read next. */
int this_optind = optind ? optind : 1;
long int tmp_long;
c = getopt_long (argc, argv, "0123456789vb:l:C:", longopts, (int *) 0);
if (c == EOF)
break;
switch (c)
{
case 0:
break;
case 'b':
if (split_type != type_undef)
{
error (0, 0, _("cannot split in more than one way"));
usage (EXIT_FAILURE);
}
split_type = type_bytes;
if (xstrtol (optarg, NULL, 10, &tmp_long, "bkm") != LONGINT_OK
|| tmp_long < 0 || tmp_long > INT_MAX)
{
error (0, 0, _("%s: invalid number of bytes"), optarg);
usage (EXIT_FAILURE);
}
accum = (int) tmp_long;
break;
case 'l':
if (split_type != type_undef)
{
error (0, 0, _("cannot split in more than one way"));
usage (EXIT_FAILURE);
}
split_type = type_lines;
if (xstrtol (optarg, NULL, 10, &tmp_long, "") != LONGINT_OK
|| tmp_long < 0 || tmp_long > INT_MAX)
{
error (0, 0, _("%s: invalid number of lines"), optarg);
usage (EXIT_FAILURE);
}
accum = (int) tmp_long;
break;
case 'C':
if (split_type != type_undef)
{
error (0, 0, _("cannot split in more than one way"));
usage (EXIT_FAILURE);
}
split_type = type_byteslines;
if (xstrtol (optarg, NULL, 10, &tmp_long, "bkm") != LONGINT_OK
|| tmp_long < 0 || tmp_long > INT_MAX)
{
error (0, 0, _("%s: invalid number of bytes"), optarg);
usage (EXIT_FAILURE);
}
accum = (int) tmp_long;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (split_type != type_undef && split_type != type_digits)
{
error (0, 0, _("cannot split in more than one way"));
usage (EXIT_FAILURE);
}
if (digits_optind != 0 && digits_optind != this_optind)
accum = 0; /* More than one number given; ignore other. */
digits_optind = this_optind;
split_type = type_digits;
accum = accum * 10 + c - '0';
break;
case 2:
verbose = 1;
break;
default:
usage (EXIT_FAILURE);
}
}
if (show_version)
{
printf ("split (%s) %s\n", GNU_PACKAGE, VERSION);
exit (EXIT_SUCCESS);
}
if (show_help)
usage (0);
/* Handle default case. */
if (split_type == type_undef)
{
split_type = type_lines;
accum = 1000;
}
if (accum < 1)
{
error (0, 0, _("invalid number"));
usage (EXIT_FAILURE);
}
num = accum;
/* Get out the filename arguments. */
if (optind < argc)
infile = argv[optind++];
if (optind < argc)
outbase = argv[optind++];
if (optind < argc)
{
error (0, 0, _("too many arguments"));
usage (EXIT_FAILURE);
}
/* Open the input file. */
if (!strcmp (infile, "-"))
input_desc = 0;
else
{
input_desc = open (infile, O_RDONLY);
if (input_desc < 0)
error (EXIT_FAILURE, errno, "%s", infile);
}
/* No output file is open now. */
output_desc = -1;
/* Copy the output file prefix so we can add suffixes to it.
26**29 is certainly enough output files! */
outfile = xmalloc (strlen (outbase) + 30);
strcpy (outfile, outbase);
outfile_mid = outfile + strlen (outfile);
outfile_end = outfile_mid + 2;
memset (outfile_mid, 0, 30);
outfile_mid[0] = 'a';
outfile_mid[1] = 'a' - 1; /* first call to next_file_name makes it an 'a' */
/* Get the optimal block size of input device and make a buffer. */
if (fstat (input_desc, &stat_buf) < 0)
error (EXIT_FAILURE, errno, "%s", infile);
in_blk_size = ST_BLKSIZE (stat_buf);
buf = xmalloc (in_blk_size + 1);
switch (split_type)
{
case type_digits:
case type_lines:
lines_split (num, buf, in_blk_size);
break;
case type_bytes:
bytes_split (num, buf, in_blk_size);
break;
case type_byteslines:
line_bytes_split (num);
break;
default:
abort ();
}
if (close (input_desc) < 0)
error (EXIT_FAILURE, errno, "%s", infile);
if (output_desc >= 0 && close (output_desc) < 0)
error (EXIT_FAILURE, errno, "%s", outfile);
exit (EXIT_SUCCESS);
}