1 files changed, 128 insertions, 0 deletions
diff --git a/usr/src/lib/libcmd/common/rev.c b/usr/src/lib/libcmd/common/rev.c
new file mode 100644
index 0000000000..ce3f2ae425
--- /dev/null
+++ b/usr/src/lib/libcmd/common/rev.c
@@ -0,0 +1,128 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*           Copyright (c) 1992-2007 AT&T Knowledge Ventures            *
+*                      and is licensed under the                       *
+*                  Common Public License, Version 1.0                  *
+*                      by AT&T Knowledge Ventures                      *
+*                                                                      *
+*                A copy of the License is available at                 *
+*            http://www.opensource.org/licenses/cpl1.0.txt             *
+*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * rev [-l] [file ...]
+ *
+ * reverse the characters or lines of one or more files
+ *
+ *   David Korn
+ *   AT&T Laboratories
+ *   dgk@research.att.com
+ *
+ */
+
+static const char usage[] =
+"[-?\n@(#)$Id: rev (AT&T Research) 1999-04-10 $\n]"
+USAGE_LICENSE
+"[+NAME?rev - reverse the characters or lines of one or more files]"
+"[+DESCRIPTION?\brev\b copies one or more files to standard output "
+	"reversing the order of characters on every line of the file "
+	"or reversing the order of lines of the file if \b-l\b is specified.]"
+"[+?If no \afile\a is given, or if the \afile\a is \b-\b, \brev\b "
+        "copies from standard input starting at the current offset.]"
+"[l:line?Reverse the lines of the file.]"
+
+"\n"
+"\n[file ...]\n"
+"\n"
+"[+EXIT STATUS?]{"
+        "[+0?All files copied successfully.]"
+        "[+>0?One or more files did not copy.]"
+"}"
+"[+SEE ALSO?\bcat\b(1), \btail\b(1)]"
+;
+
+#include	<cmd.h>
+#include	<rev.h>
+
+/*
+ * reverse the characters within a line
+ */
+static int rev_char(Sfio_t *in, Sfio_t *out)
+{
+	register int c;
+	register char *ep, *bp, *cp;
+	register int n;
+	while(cp = bp = sfgetr(in,'\n',0))
+	{
+		ep = bp + (n=sfvalue(in)) -1;
+		while(ep > bp)
+		{
+			c = *--ep;
+			*ep = *bp;
+			*bp++ = c;
+		}
+		if(sfwrite(out,cp,n)<0)
+			return(-1);
+	}
+	return(0);
+}
+
+int
+b_rev(int argc, register char** argv, void* context)
+{
+	register Sfio_t *fp;
+	register char *cp;
+	register int n, line=0;
+	NOT_USED(argc);
+
+	cmdinit(argc, argv, context, ERROR_CATALOG, 0);
+	while (n = optget(argv, usage)) switch (n)
+	{
+	    case 'l':
+		line=1;
+		break;
+	    case ':':
+		error(2, "%s", opt_info.arg);
+		break;
+	    case '?':
+		error(ERROR_usage(2), "%s", opt_info.arg);
+		break;
+	}
+	argv += opt_info.index;
+	if(error_info.errors)
+		error(ERROR_usage(2),"%s",optusage((char*)0));
+	n=0;
+	if(cp = *argv)
+		argv++;
+	do
+	{
+		if(!cp || streq(cp,"-"))
+			fp = sfstdin;
+		else if(!(fp = sfopen((Sfio_t*)0,cp,"r")))
+		{
+			error(ERROR_system(0),"%s: cannot open",cp);
+			n=1;
+			continue;
+		}
+		if(line)
+			line = rev_line(fp,sfstdout,sftell(fp));
+		else
+			line = rev_char(fp,sfstdout);
+		if(fp!=sfstdin)
+			sfclose(fp);
+		if(line < 0)
+			error(ERROR_system(1),"write failed");
+	}
+	while(cp= *argv++);
+	return(n);
+}