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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, const char *reason)
- {
- if (reason != NULL)
- fprintf (stderr, "%s: %s\n", program_name, reason);
-
- 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\
- -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file\n\
- -b, --bytes=SIZE put SIZE bytes per output file\n\
- -l, --lines=NUMBER put NUMBER lines per output file\n\
- --verbose print a diagnostic to standard error just\n\
- before each output file is opened\n\
- -NUMBER same as -l NUMBER\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\
- "));
- }
- 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;
-
- program_name = argv[0];
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- /* 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)
- usage (2, _("cannot split in more than one way"));
- split_type = type_bytes;
- if (xstrtol (optarg, NULL, 10, &tmp_long, "bkm") != LONGINT_OK
- || tmp_long < 0 || tmp_long > INT_MAX)
- usage (2, _("invalid number of bytes"));
- accum = (int) tmp_long;
- break;
-
- case 'l':
- if (split_type != type_undef)
- usage (2, _("cannot split in more than one way"));
- split_type = type_lines;
- if (xstrtol (optarg, NULL, 10, &tmp_long, "") != LONGINT_OK
- || tmp_long < 0 || tmp_long > INT_MAX)
- usage (2, _("invalid number of lines"));
- accum = (int) tmp_long;
- break;
-
- case 'C':
- if (split_type != type_undef)
- usage (2, _("cannot split in more than one way"));
- split_type = type_byteslines;
- if (xstrtol (optarg, NULL, 10, &tmp_long, "bkm") != LONGINT_OK
- || tmp_long < 0 || tmp_long > INT_MAX)
- usage (2, _("invalid number of bytes"));
- 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)
- usage (2, _("cannot split in more than one way"));
- 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 (2, (char *)0);
- }
- }
-
- if (show_version)
- {
- printf ("split - %s\n", PACKAGE_VERSION);
- exit (EXIT_SUCCESS);
- }
-
- if (show_help)
- usage (0, (char *)0);
-
- /* Handle default case. */
- if (split_type == type_undef)
- {
- split_type = type_lines;
- accum = 1000;
- }
-
- if (accum < 1)
- usage (2, _("invalid number"));
- num = accum;
-
- /* Get out the filename arguments. */
-
- if (optind < argc)
- infile = argv[optind++];
-
- if (optind < argc)
- outbase = argv[optind++];
-
- if (optind < argc)
- usage (2, _("too many arguments"));
-
- /* 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);
- }
-