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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: split.c,v 1.17 2009/10/27 23:59:43 deraadt Exp $	*/
/*	$NetBSD: split.c,v 1.5 1995/08/31 22:22:05 jtc Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/types.h>

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <regex.h>
#include <sysexits.h>

#define DEFLINE	1000			/* Default num lines per file. */

ssize_t	 bytecnt;			/* Byte count to split on. */
long	 numlines;			/* Line count to split on. */
int	 file_open;			/* If a file open. */
int	 ifd = -1, ofd = -1;		/* Input/output file descriptors. */
char	 bfr[MAXBSIZE];			/* I/O buffer. */
char	 fname[MAXPATHLEN];		/* File name prefix. */
regex_t	 rgx;
int	 pflag;
int	 sufflen = 2;			/* File name suffix length. */

void newfile(void);
void split1(void);
void split2(void);
__dead void usage(void);

int
main(int argc, char *argv[])
{
	int ch, scale;
	char *ep, *p;
	const char *errstr;

	while ((ch = getopt(argc, argv, "0123456789a:b:l:p:-")) != -1)
		switch (ch) {
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			/*
			 * Undocumented kludge: split was originally designed
			 * to take a number after a dash.
			 */
			if (numlines == 0) {
				p = argv[optind - 1];
				if (p[0] == '-' && p[1] == ch && !p[2])
					numlines = strtol(++p, &ep, 10);
				else
					numlines =
					    strtol(argv[optind] + 1, &ep, 10);
				if (numlines <= 0 || *ep)
					errx(EX_USAGE,
					    "%s: illegal line count", optarg);
			}
			break;
		case '-':		/* Undocumented: historic stdin flag. */
			if (ifd != -1)
				usage();
			ifd = 0;
			break;
		case 'a':		/* suffix length. */
			sufflen = strtonum(optarg, 1, NAME_MAX, &errstr);
			if (errstr)
				errx(EX_USAGE, "%s: %s", optarg, errstr);
			break;
		case 'b':		/* Byte count. */
			if ((bytecnt = strtol(optarg, &ep, 10)) <= 0 ||
			    (*ep != '\0' && *ep != 'k' && *ep != 'm'))
				errx(EX_USAGE,
				    "%s: illegal byte count", optarg);
			if (*ep == 'k')
				scale = 1024;
			else if (*ep == 'm')
				scale = 1048576;
			else
				scale = 1;
			if (bytecnt > SSIZE_MAX / scale)
				errx(EX_USAGE, "%s: byte count too large",
				    optarg);
			bytecnt *= scale;
			break;
		case 'p' :      /* pattern matching. */
			if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
				errx(EX_USAGE, "%s: illegal regexp", optarg);
			pflag = 1;
			break;
		case 'l':		/* Line count. */
			if (numlines != 0)
				usage();
			if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
				errx(EX_USAGE,
				    "%s: illegal line count", optarg);
			break;
		default:
			usage();
		}
	argv += optind;
	argc -= optind;

	if (*argv != NULL)
		if (ifd == -1) {		/* Input file. */
			if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
				err(EX_NOINPUT, "%s", *argv);
			++argv;
		}
	if (*argv != NULL)			/* File name prefix. */
		(void)strlcpy(fname, *argv++, sizeof(fname));
	if (*argv != NULL)
		usage();

	if (strlen(fname) + sufflen >= sizeof(fname))
		errx(EX_USAGE, "suffix is too long");
	if (pflag && (numlines != 0 || bytecnt != 0))
		usage();

	if (numlines == 0)
		numlines = DEFLINE;
	else if (bytecnt != 0)
		usage();

	if (ifd == -1)				/* Stdin by default. */
		ifd = 0;

	if (bytecnt) {
		split1();
		exit (0);
	}
	split2();
	if (pflag)
		regfree(&rgx);
	exit(0);
}

/*
 * split1 --
 *	Split the input by bytes.
 */
void
split1(void)
{
	ssize_t bcnt, dist, len;
	char *C;

	for (bcnt = 0;;)
		switch ((len = read(ifd, bfr, MAXBSIZE))) {
		case 0:
			exit(0);
		case -1:
			err(EX_IOERR, "read");
			/* NOTREACHED */
		default:
			if (!file_open)
				newfile();
			if (bcnt + len >= bytecnt) {
				dist = bytecnt - bcnt;
				if (write(ofd, bfr, dist) != dist)
					err(EX_IOERR, "write");
				len -= dist;
				for (C = bfr + dist; len >= bytecnt;
				    len -= bytecnt, C += bytecnt) {
					newfile();
					if (write(ofd, C, bytecnt) != bytecnt)
						err(EX_IOERR, "write");
				}
				if (len != 0) {
					newfile();
					if (write(ofd, C, len) != len)
						err(EX_IOERR, "write");
				} else
					file_open = 0;
				bcnt = len;
			} else {
				bcnt += len;
				if (write(ofd, bfr, len) != len)
					err(EX_IOERR, "write");
			}
		}
}

/*
 * split2 --
 *	Split the input by lines.
 */
void
split2(void)
{
	long lcnt = 0;
	FILE *infp;

	/* Stick a stream on top of input file descriptor */
	if ((infp = fdopen(ifd, "r")) == NULL)
		err(EX_NOINPUT, "fdopen");

	/* Process input one line at a time */
	while (fgets(bfr, sizeof(bfr), infp) != NULL) {
		const int len = strlen(bfr);

		if (len == 0)
			continue;

		/* If line is too long to deal with, just write it out */
		if (bfr[len - 1] != '\n')
			goto writeit;

		/* Check if we need to start a new file */
		if (pflag) {
			regmatch_t pmatch;

			pmatch.rm_so = 0;
			pmatch.rm_eo = len - 1;
			if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
				newfile();
		} else if (lcnt++ == numlines) {
			newfile();
			lcnt = 1;
		}

writeit:
		/* Open output file if needed */
		if (!file_open)
			newfile();

		/* Write out line */
		if (write(ofd, bfr, len) != len)
			err(EX_IOERR, "write");
	}

	/* EOF or error? */
	if (ferror(infp))
		err(EX_IOERR, "read");
	else
		exit(0);
}

/*
 * newfile --
 *	Open a new output file.
 */
void
newfile(void)
{
	static char *suffix, *sufftail;
	char *sptr;

	if (ofd == -1) {
		ofd = fileno(stdout);
		if (*fname == '\0') {
			*fname = 'x';	/* no name specified, use 'x' */
			memset(fname + 1, 'a', sufflen);
			suffix = fname;
			sufflen++;	/* treat 'x' as part of suffix */
		} else {
			suffix = fname + strlen(fname);
			memset(suffix, 'a', sufflen);
		}
		suffix[sufflen] = '\0';
		sufftail = suffix + sufflen - 1;
	} else {
		for (sptr = sufftail; sptr >= suffix; sptr--) {
			if (*sptr != 'z') {
				(*sptr)++;
				break;
			} else
				*sptr = 'a';
		}
		if (sptr < suffix)
			errx(EX_DATAERR, "too many files");
	}

	if (!freopen(fname, "w", stdout))
		err(EX_IOERR, "%s", fname);
	file_open = 1;
}

__dead void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr, "usage: %s [-a suffix_length]\n"
	    "             [-b byte_count[k|m] | -l line_count | -p pattern] "
	    "[file [name]]\n", __progname);
	exit(EX_USAGE);
}