From 5b602ca8a2c939e930ea84347ed5c9de256049f3 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Fri, 26 Jul 2019 10:46:58 +0200
Subject: [PATCH] Add support for "\a" and "\v" to regex and command line args
 (#44)

Support POSIX-specified C-style escape sequences "\a" (alarm)
and "\v" (vertical tab) in command line arguments and regular
expressions, further to the support for them in strings added on
Apr 9, 1989. These now no longer match as literal "a" and "v"
characters (as they don't on gawk and mawk).

IOW, lex.c already supported these (lines 390-391 as of 4e343460);
the support needed to be added to b.c and tran.c.

Relevant POSIX reference:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html#tag_20_06_13_04
---
 FIXES  | 7 +++++++
 b.c    | 4 ++++
 main.c | 2 +-
 tran.c | 2 ++
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/FIXES b/FIXES
index 3178706..55dfe20 100644
--- a/FIXES
+++ b/FIXES
@@ -25,6 +25,13 @@ THIS SOFTWARE.
 This file lists all bug fixes, changes, etc., made since the AWK book
 was sent to the printers in August, 1987.
 
+July 26, 2019:
+	Support POSIX-specified C-style escape sequences "\a" (alarm)
+	and "\v" (vertical tab) in command line arguments and regular
+	expressions, further to the support for them in strings added on
+	Apr 9, 1989. These now no longer match as literal "a" and "v"
+	characters (as they don't on other awk implementations).
+
 July 17, 2019:
 	Pull in a number of code cleanups and minor fixes from
 	Warner Losh's bsd-ota branch.  The only user visible change
diff --git a/b.c b/b.c
index 3f6745c..91dd78d 100644
--- a/b.c
+++ b/b.c
@@ -279,6 +279,10 @@ int quoted(uschar **pp)	/* pick up next thing after a \\ */
 		c = '\r';
 	else if (c == 'b')
 		c = '\b';
+	else if (c == 'v')
+		c = '\v';
+	else if (c == 'a')
+		c = '\a';
 	else if (c == '\\')
 		c = '\\';
 	else if (c == 'x') {	/* hexadecimal goo follows */
diff --git a/main.c b/main.c
index e4beb0a..0f66a37 100644
--- a/main.c
+++ b/main.c
@@ -22,7 +22,7 @@ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
 THIS SOFTWARE.
 ****************************************************************/
 
-const char	*version = "version 20190717";
+const char	*version = "version 20190726";
 
 #define DEBUG
 #include <stdio.h>
diff --git a/tran.c b/tran.c
index 68835b0..35c947d 100644
--- a/tran.c
+++ b/tran.c
@@ -543,6 +543,8 @@ char *qstring(const char *is, int delim)	/* collect string up to next delim */
 			case 'b':	*bp++ = '\b'; break;
 			case 'f':	*bp++ = '\f'; break;
 			case 'r':	*bp++ = '\r'; break;
+			case 'v':	*bp++ = '\v'; break;
+			case 'a':	*bp++ = '\a'; break;
 			default:
 				if (!isdigit(c)) {
 					*bp++ = c;