implemented 'tac' in a suckless way remove mtime binary from the repository - 9base - revived minimalist port of Plan 9 userland to Unix
HTML git clone git://git.suckless.org/9base
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 942791ab23de64d2580e3143ba3866ad85fa8ab3
DIR parent 3bdea00b978d1f91addcee5a8afd01acd7db3ea4
HTML 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(-)
---
DIR 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
DIR diff --git a/mtime/mtime b/mtime/mtime
Binary files differ.
DIR 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:
DIR 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
DIR 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);
+}