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	implemented 'tac' in a suckless way remove mtime binary from the repository - 9…
	git clone git://git.suckless.org/9base
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	---
	commit 942791ab23de64d2580e3143ba3866ad85fa8ab3
	parent 3bdea00b978d1f91addcee5a8afd01acd7db3ea4
	Author: pancake <nopcode.org>
	Date: Thu, 1 Apr 2010 16:03:15 +0200

	implemented 'tac' in a suckless way
	remove mtime binary from the repository
	Diffstat:
	M Makefile \| 4 ++--
	D mtime/mtime \| 0
	A tac/Makefile \| 10 ++++++++++
	A tac/tac.1 \| 28 ++++++++++++++++++++++++++++
	A tac/tac.c \| 60 +++++++++++++++++++++++++++++…

	5 files changed, 100 insertions(+), 2 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -3,8 +3,8 @@
	include config.mk

	SUBDIRS = lib9 yacc awk basename bc cal cat cleanname date dc du echo \
	- fortune freq getflags grep hoc ls mk mkdir mtime \
	- rc read sed seq sleep sort tee test touch tr troff uniq
	+ fortune freq getflags grep hoc ls mk mkdir mtime rc read \
	+ sed seq sleep sort tac tee test touch tr troff uniq

	# factor primes

	diff --git a/mtime/mtime b/mtime/mtime
	Binary files differ.
	diff --git a/tac/Makefile b/tac/Makefile
	@@ -0,0 +1,10 @@
	+# tac - reverse line order cat
	+# Depends on ../lib9
	+
	+TARG = tac
	+
	+include ../std.mk
	+
	+pre-uninstall:
	+
	+post-install:
	diff --git a/tac/tac.1 b/tac/tac.1
	@@ -0,0 +1,28 @@
	+.TH TAC 1
	+.SH NAME
	+tac \- reverse concatenate files
	+.SH SYNOPSIS
	+.B tac
	+[
	+.I file ...
	+]
	+.SH DESCRIPTION
	+.I Tac
	+reads each
	+.I file
	+in sequence and writes it on the standard output in reverse line order.
	+.IP
	+.L
	+tac file
	+.LP
	+prints a file in reverse line order
	+.IP
	+.L
	+tac file1 file2 >file3
	+.LP
	+Concatenate reversed file1 and file2 into file3
	+.LP
	+.SH SEE ALSO
	+.IR cat (1)
	+.SH BUGS
	+Same as in cat
	diff --git a/tac/tac.c b/tac/tac.c
	@@ -0,0 +1,60 @@
	+/* author: pancake<nopcode.org> */
	+#include <u.h>
	+#include <libc.h>
	+
	+static vlong bsize = 0;
	+static char *buf;
	+#define LINES 4096
	+
	+void
	+tac()
	+{
	+ int i, j;
	+ char ptr, *nls;
	+ nls = malloc(LINES*sizeof(nls));
	+ for(i=1, ptr=buf; ptr;) {
	+ assert(nls != NULL);
	+ for(j=0; j<LINES && (ptr=strchr(ptr+1, '\n')); j++)
	+ nls[i++] = ptr+1;
	+ nls = realloc(nls, (i+LINES)*sizeof(nls));
	+ }
	+ *nls = buf;
	+ while(i--)
	+ write(1, nls[i], nls[i+1]-nls[i]);
	+ free(nls);
	+}
	+
	+void
	+load(int f)
	+{
	+ vlong nsize, size = seek(f, 0, 2);
	+ if (size>0) {
	+ nsize = bsize + size;
	+ buf = realloc(buf, nsize);
	+ seek(f, 0, 0);
	+ read(f, buf+bsize, size);
	+ bsize = nsize;
	+ } else
	+ while ((size = read(f, buf+bsize, LINES))>0)
	+ bsize+=size;
	+}
	+
	+void
	+main(int argc, char *argv[])
	+{
	+ int i, f;
	+ buf = malloc(1);
	+ assert(buf != NULL);
	+ if (argc == 1)
	+ load(0);
	+ else for(i=1; i<argc; i++){
	+ f = open(argv[i], OREAD);
	+ if(f >= 0){
	+ load(f);
	+ close(f);
	+ }else sysfatal("can't open %s: %r", argv[i]);
	+ }
	+ tac();
	+ free(buf);
	+ exits(0);
	+}