Add csplit(1) from FreeBSD; with man page tweaks from jmc@.

OK deraadt@

3 files changed, 635 insertions, 0 deletions

diff --git a/usr.bin/csplit/Makefile b/usr.bin/csplit/Makefile
new file mode 100644
index 00000000000..2ae70ef226c
--- /dev/null
+++ b/usr.bin/csplit/Makefile
@@ -0,0 +1,5 @@
+#	$OpenBSD: Makefile,v 1.1 2006/07/17 16:38:02 millert Exp $
+
+PROG=	csplit
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/csplit/csplit.1 b/usr.bin/csplit/csplit.1
new file mode 100644
index 00000000000..f55cf993b3c
--- /dev/null
+++ b/usr.bin/csplit/csplit.1
@@ -0,0 +1,161 @@
+.\"	$OpenBSD: csplit.1,v 1.1 2006/07/17 16:38:02 millert Exp $
+.\"
+.\" Copyright (c) 2002 Tim J. Robbins.
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD: src/usr.bin/csplit/csplit.1,v 1.11 2005/01/25 22:29:51 tjr Exp $
+.\"
+.Dd January 26, 2005
+.Dt CSPLIT 1
+.Os
+.Sh NAME
+.Nm csplit
+.Nd split files based on context
+.Sh SYNOPSIS
+.Nm
+.Op Fl ks
+.Op Fl f Ar prefix
+.Op Fl n Ar number
+.Ar file args ...
+.Sh DESCRIPTION
+The
+.Nm
+utility splits
+.Ar file
+into pieces using the patterns
+.Ar args .
+If
+.Ar file
+is
+a dash
+.Pq Sq - ,
+.Nm
+reads from standard input.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl f Ar prefix
+Give created files names beginning with
+.Ar prefix .
+The default is
+.Dq xx .
+.It Fl k
+Do not remove output files if an error occurs or a
+.Dv HUP ,
+.Dv INT ,
+or
+.Dv TERM
+signal is received.
+.It Fl n Ar number
+Use
+.Ar number
+of decimal digits after the
+.Ar prefix
+to form the file name.
+The default is 2.
+.It Fl s
+Do not write the size of each output file to standard output as it is
+created.
+.El
+.Pp
+The
+.Ar args
+operands may be a combination of the following patterns:
+.Bl -tag -width indent
+.It Xo
+.Sm off
+.No / Ar regexp No /
+.Op Oo Cm + | - Oc Ar offset
+.Sm on
+.Xc
+Create a file containing the input from the current line to (but not including)
+the next line matching the given basic regular expression.
+An optional
+.Ar offset
+from the line that matched may be specified.
+.It Xo
+.Sm off
+.No % Ar regexp No %
+.Op Oo Cm + | - Oc Ar offset
+.Sm on
+.Xc
+Same as above but a file is not created for the output.
+.It Ar line_no
+Create containing the input from the current line to (but not including)
+the specified line number.
+.It { Ns Ar num Ns }
+Repeat the previous pattern the specified number of times.
+If it follows a line number pattern, a new file will be created for each
+.Ar line_no
+lines,
+.Ar num
+times.
+The first line of the file is line number 1 for historic reasons.
+.El
+.Pp
+After all the patterns have been processed, the remaining input data
+(if there is any) will be written to a new file.
+.Pp
+Requesting to split at a line before the current line number or past the
+end of the file will result in an error.
+.Pp
+.Ex -std
+.Sh ENVIRONMENT
+The
+.Ev LANG , LC_ALL , LC_COLLATE ,
+and
+.Ev LC_CTYPE
+environment variables affect the execution of
+.Nm
+as described in
+.Xr environ 7 .
+.Sh EXAMPLES
+Split the
+.Xr mdoc 7
+file
+.Pa foo.1
+into one file for each section (up to 20):
+.Pp
+.Dl "csplit -k foo.1 '%^\e.Sh%' '/^\e.Sh/' '{20}'"
+.Pp
+Split standard input after the first 99 lines and every 100 lines thereafter:
+.Pp
+.Dl "csplit -k - 100 '{19}'"
+.Sh SEE ALSO
+.Xr sed 1 ,
+.Xr split 1 ,
+.Xr re_format 7
+.Sh STANDARDS
+The
+.Nm
+utility conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+A
+.Nm
+command appeared in PWB UNIX.
+.Sh BUGS
+Input lines are limited to
+.Dv LINE_MAX
+(2048) bytes in length.
diff --git a/usr.bin/csplit/csplit.c b/usr.bin/csplit/csplit.c
new file mode 100644
index 00000000000..9c257f836e7
--- /dev/null
+++ b/usr.bin/csplit/csplit.c
@@ -0,0 +1,469 @@
+/*	$OpenBSD: csplit.c,v 1.1 2006/07/17 16:38:02 millert Exp $	*/
+/*	$FreeBSD: src/usr.bin/csplit/csplit.c,v 1.9 2004/03/22 11:15:03 tjr Exp $	*/
+
+/*-
+ * Copyright (c) 2002 Tim J. Robbins.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * csplit -- split files based on context
+ *
+ * This utility splits its input into numbered output files by line number
+ * or by a regular expression. Regular expression matches have an optional
+ * offset with them, allowing the split to occur a specified number of
+ * lines before or after the match.
+ *
+ * To handle negative offsets, we stop reading when the match occurs and
+ * store the offset that the file should have been split at, then use
+ * this output file as input until all the "overflowed" lines have been read.
+ * The file is then closed and truncated to the correct length.
+ *
+ * We assume that the output files can be seeked upon (ie. they cannot be
+ * symlinks to named pipes or character devices), but make no such
+ * assumption about the input.
+ */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <locale.h>
+#include <regex.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+void	 cleanup(void);
+void	 do_lineno(const char *);
+void	 do_rexp(const char *);
+char	*getline(void);
+void	 handlesig(int);
+FILE	*newfile(void);
+void	 toomuch(FILE *, long);
+void	 usage(void);
+
+/*
+ * Command line options
+ */
+const char *prefix;		/* File name prefix */
+long	 sufflen;		/* Number of decimal digits for suffix */
+int	 sflag;			/* Suppress output of file names */
+int	 kflag;			/* Keep output if error occurs */
+
+/*
+ * Other miscellaneous globals (XXX too many)
+ */
+long	 lineno;		/* Current line number in input file */
+long	 reps;			/* Number of repetitions for this pattern */
+long	 nfiles;		/* Number of files output so far */
+long	 maxfiles;		/* Maximum number of files we can create */
+char	 currfile[PATH_MAX];	/* Current output file */
+const char *infn;		/* Name of the input file */
+FILE	*infile;		/* Input file handle */
+FILE	*overfile;		/* Overflow file for toomuch() */
+off_t	 truncofs;		/* Offset this file should be truncated at */
+int	 doclean;		/* Should cleanup() remove output? */
+
+int
+main(int argc, char *argv[])
+{
+	struct sigaction sa;
+	long i;
+	int ch;
+	const char *expr;
+	char *ep, *p;
+	FILE *ofp;
+
+	setlocale(LC_ALL, "");
+
+	kflag = sflag = 0;
+	prefix = "xx";
+	sufflen = 2;
+	while ((ch = getopt(argc, argv, "f:kn:s")) != -1) {
+		switch (ch) {
+		case 'f':
+			prefix = optarg;
+			break;
+		case 'k':
+			kflag = 1;
+			break;
+		case 'n':
+			errno = 0;
+			sufflen = strtol(optarg, &ep, 10);
+			if (sufflen <= 0 || *ep != '\0' || errno != 0)
+				errx(1, "%s: bad suffix length", optarg);
+			break;
+		case 's':
+			sflag = 1;
+			break;
+		default:
+			usage();
+			/*NOTREACHED*/
+		}
+	}
+
+	if (sufflen + strlen(prefix) >= PATH_MAX)
+		errx(1, "name too long");
+
+	argc -= optind;
+	argv += optind;
+
+	if ((infn = *argv++) == NULL)
+		usage();
+	if (strcmp(infn, "-") == 0) {
+		infile = stdin;
+		infn = "stdin";
+	} else if ((infile = fopen(infn, "r")) == NULL)
+		err(1, "%s", infn);
+
+	if (!kflag) {
+		doclean = 1;
+		atexit(cleanup);
+		sa.sa_flags = 0;
+		sa.sa_handler = handlesig;
+		sigemptyset(&sa.sa_mask);
+		sigaddset(&sa.sa_mask, SIGHUP);
+		sigaddset(&sa.sa_mask, SIGINT);
+		sigaddset(&sa.sa_mask, SIGTERM);
+		sigaction(SIGHUP, &sa, NULL);
+		sigaction(SIGINT, &sa, NULL);
+		sigaction(SIGTERM, &sa, NULL);
+	}
+
+	lineno = 0;
+	nfiles = 0;
+	truncofs = 0;
+	overfile = NULL;
+
+	/* Ensure 10^sufflen < LONG_MAX. */
+	for (maxfiles = 1, i = 0; i < sufflen; i++) {
+		if (maxfiles > LONG_MAX / 10)
+			errx(1, "%ld: suffix too long (limit %ld)",
+			    sufflen, i);
+		maxfiles *= 10;
+	}
+
+	/* Create files based on supplied patterns. */
+	while (nfiles < maxfiles - 1 && (expr = *argv++) != NULL) {
+		/* Look ahead & see if this pattern has any repetitions. */
+		if (*argv != NULL && **argv == '{') {
+			errno = 0;
+			reps = strtol(*argv + 1, &ep, 10);
+			if (reps < 0 || *ep != '}' || errno != 0)
+				errx(1, "%s: bad repetition count", *argv + 1);
+			argv++;
+		} else
+			reps = 0;
+
+		if (*expr == '/' || *expr == '%') {
+			do {
+				do_rexp(expr);
+			} while (reps-- != 0 && nfiles < maxfiles - 1);
+		} else if (isdigit((unsigned char)*expr))
+			do_lineno(expr);
+		else
+			errx(1, "%s: unrecognised pattern", expr);
+	}
+
+	/* Copy the rest into a new file. */
+	if (!feof(infile)) {
+		ofp = newfile();
+		while ((p = getline()) != NULL && fputs(p, ofp) == 0)
+			;
+		if (!sflag)
+			printf("%jd\n", (intmax_t)ftello(ofp));
+		if (fclose(ofp) != 0)
+			err(1, "%s", currfile);
+	}
+
+	toomuch(NULL, 0);
+	doclean = 0;
+
+	return (0);
+}
+
+void
+usage(void)
+{
+	extern char *__progname;
+
+	fprintf(stderr,
+	    "usage: %s [-ks] [-f prefix] [-n number] file args ...\n",
+	    __progname);
+	exit(1);
+}
+
+void
+handlesig(int sig)
+{
+	const char msg[] = "csplit: caught signal, cleaning up\n";
+
+	write(STDERR_FILENO, msg, sizeof(msg) - 1);
+	cleanup();
+	_exit(2);
+}
+
+/* Create a new output file. */
+FILE *
+newfile(void)
+{
+	FILE *fp;
+
+	if ((size_t)snprintf(currfile, sizeof(currfile), "%s%0*ld", prefix,
+	    (int)sufflen, nfiles) >= sizeof(currfile))
+		errx(1, "%s: %s", currfile, strerror(ENAMETOOLONG));
+	if ((fp = fopen(currfile, "w+")) == NULL)
+		err(1, "%s", currfile);
+	nfiles++;
+
+	return (fp);
+}
+
+/* Remove partial output, called before exiting. */
+void
+cleanup(void)
+{
+	char fnbuf[PATH_MAX];
+	long i;
+
+	if (!doclean)
+		return;
+
+	/*
+	 * NOTE: One cannot portably assume to be able to call snprintf()
+	 * from inside a signal handler. It does, however, appear to be safe
+	 * to do on FreeBSD. The solution to this problem is worse than the
+	 * problem itself.
+	 */
+
+	for (i = 0; i < nfiles; i++) {
+		snprintf(fnbuf, sizeof(fnbuf), "%s%0*ld", prefix,
+		    (int)sufflen, i);
+		unlink(fnbuf);
+	}
+}
+
+/* Read a line from the input into a static buffer. */
+char *
+getline(void)
+{
+	static char lbuf[LINE_MAX];
+	FILE *src;
+
+	src = overfile != NULL ? overfile : infile;
+
+again: if (fgets(lbuf, sizeof(lbuf), src) == NULL) {
+		if (src == overfile) {
+			src = infile;
+			goto again;
+		}
+		return (NULL);
+	}
+	if (ferror(src))
+		err(1, "%s", infn);
+	lineno++;
+
+	return (lbuf);
+}
+
+/* Conceptually rewind the input (as obtained by getline()) back `n' lines. */
+void
+toomuch(FILE *ofp, long n)
+{
+	char buf[BUFSIZ];
+	size_t i, nread;
+
+	if (overfile != NULL) {
+		/*
+		 * Truncate the previous file we overflowed into back to
+		 * the correct length, close it.
+		 */
+		if (fflush(overfile) != 0)
+			err(1, "overflow");
+		if (ftruncate(fileno(overfile), truncofs) != 0)
+			err(1, "overflow");
+		if (fclose(overfile) != 0)
+			err(1, "overflow");
+		overfile = NULL;
+	}
+
+	if (n == 0)
+		/* Just tidying up */
+		return;
+
+	lineno -= n;
+
+	/*
+	 * Wind the overflow file backwards to `n' lines before the
+	 * current one.
+	 */
+	do {
+		if (ftello(ofp) < (off_t)sizeof(buf))
+			rewind(ofp);
+		else
+			fseeko(ofp, -(off_t)sizeof(buf), SEEK_CUR);
+		if (ferror(ofp))
+			errx(1, "%s: can't seek", currfile);
+		if ((nread = fread(buf, 1, sizeof(buf), ofp)) == 0)
+			errx(1, "can't read overflowed output");
+		if (fseeko(ofp, -(off_t)nread, SEEK_CUR) != 0)
+			err(1, "%s", currfile);
+		for (i = 1; i <= nread; i++)
+			if (buf[nread - i] == '\n' && n-- == 0)
+				break;
+		if (ftello(ofp) == 0)
+			break;
+	} while (n > 0);
+	if (fseeko(ofp, (off_t)(nread - i + 1), SEEK_CUR) != 0)
+		err(1, "%s", currfile);
+
+	/*
+	 * getline() will read from here. Next call will truncate to
+	 * truncofs in this file.
+	 */
+	overfile = ofp;
+	truncofs = ftello(overfile);
+}
+
+/* Handle splits for /regexp/ and %regexp% patterns. */
+void
+do_rexp(const char *expr)
+{
+	regex_t cre;
+	intmax_t nwritten;
+	long ofs;
+	int first;
+	char *ecopy, *ep, *p, *pofs, *re;
+	FILE *ofp;
+
+	if ((ecopy = strdup(expr)) == NULL)
+		err(1, "strdup");
+
+	re = ecopy + 1;
+	if ((pofs = strrchr(ecopy, *expr)) == NULL || pofs[-1] == '\\')
+		errx(1, "%s: missing trailing %c", expr, *expr);
+	*pofs++ = '\0';
+
+	if (*pofs != '\0') {
+		errno = 0;
+		ofs = strtol(pofs, &ep, 10);
+		if (*ep != '\0' || errno != 0)
+			errx(1, "%s: bad offset", pofs);
+	} else
+		ofs = 0;
+
+	if (regcomp(&cre, re, REG_BASIC|REG_NOSUB) != 0)
+		errx(1, "%s: bad regular expression", re);
+
+	if (*expr == '/')
+		/* /regexp/: Save results to a file. */
+		ofp = newfile();
+	else {
+		/* %regexp%: Make a temporary file for overflow. */
+		if ((ofp = tmpfile()) == NULL)
+			err(1, "tmpfile");
+	}
+
+	/* Read and output lines until we get a match. */
+	first = 1;
+	while ((p = getline()) != NULL) {
+		if (fputs(p, ofp) != 0)
+			break;
+		if (!first && regexec(&cre, p, 0, NULL, 0) == 0)
+			break;
+		first = 0;
+	}
+
+	if (p == NULL)
+		errx(1, "%s: no match", re);
+
+	if (ofs <= 0) {
+		/*
+		 * Negative (or zero) offset: throw back any lines we should
+		 * not have read yet.
+		  */
+		if (p != NULL) {
+			toomuch(ofp, -ofs + 1);
+			nwritten = (intmax_t)truncofs;
+		} else
+			nwritten = (intmax_t)ftello(ofp);
+	} else {
+		/*
+		 * Positive offset: copy the requested number of lines
+		 * after the match.
+		 */
+		while (--ofs > 0 && (p = getline()) != NULL)
+			fputs(p, ofp);
+		toomuch(NULL, 0);
+		nwritten = (intmax_t)ftello(ofp);
+		if (fclose(ofp) != 0)
+			err(1, "%s", currfile);
+	}
+
+	if (!sflag && *expr == '/')
+		printf("%jd\n", nwritten);
+
+	regfree(&cre);
+	free(ecopy);
+}
+
+/* Handle splits based on line number. */
+void
+do_lineno(const char *expr)
+{
+	long lastline, tgtline;
+	char *ep, *p;
+	FILE *ofp;
+
+	errno = 0;
+	tgtline = strtol(expr, &ep, 10);
+	if (tgtline <= 0 || errno != 0 || *ep != '\0')
+		errx(1, "%s: bad line number", expr);
+	lastline = tgtline;
+	if (lastline <= lineno)
+		errx(1, "%s: can't go backwards", expr);
+
+	while (nfiles < maxfiles - 1) {
+		ofp = newfile();
+		while (lineno + 1 != lastline) {
+			if ((p = getline()) == NULL)
+				errx(1, "%ld: out of range", lastline);
+			if (fputs(p, ofp) != 0)
+				break;
+		}
+		if (!sflag)
+			printf("%jd\n", (intmax_t)ftello(ofp));
+		if (fclose(ofp) != 0)
+			err(1, "%s", currfile);
+		if (reps-- == 0)
+			break;
+		lastline += tgtline;
+	} 
+}