From 53f5c0d5bf9c03e68531f89e05872f6cc0d88962 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Mon, 26 Jul 2004 12:06:19 +0000
Subject: [PATCH] Allow hex escape sequences

---
 libbb/process_escape_sequence.c | 39 ++++++++++++++++-----------------------
 1 file changed, 16 insertions(+), 23 deletions(-)

diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c
index e6b5fc9..f5ac500 100644
--- a/libbb/process_escape_sequence.c
+++ b/libbb/process_escape_sequence.c
@@ -22,42 +22,35 @@
  *
  */
 
-#include <string.h>
 #include <stdio.h>
 #include <limits.h>
-#include <ctype.h>
 #include "libbb.h"
 
-#define isodigit(c) ((c) >= '0' && (c) <= '7')
-#define hextobin(c) ((c)>='a'&&(c)<='f' ? (c)-'a'+10 : (c)>='A'&&(c)<='F' ? (c)-'A'+10 : (c)-'0')
-#define octtobin(c) ((c) - '0')
 char bb_process_escape_sequence(const char **ptr)
 {
-	const char *p, *q;
-	unsigned int num_digits, r, n, hexescape;
 	static const char charmap[] = {
 		'a',  'b',  'f',  'n',  'r',  't',  'v',  '\\', 0,
 		'\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
 
-	n = r = hexescape = num_digits = 0;
-	q = *ptr;
+	const char *p;
+	const char *q;
+	unsigned int num_digits;
+	unsigned int r;
+	unsigned int n;
 
-	if (*q == 'x') {
-		hexescape++;
-		++q;
-	}
+	n = 0;
+	q = *ptr;
 
+	num_digits = 0;
 	do {
-		if (hexescape && isxdigit(*q)) {
-			r = n * 16 + hextobin(*q);
-		} else if (isodigit(*q)) {
-			r = n * 8 + octtobin(*q);
-		}
-		if (r <= UCHAR_MAX) {
-			n = r;
-			++q;
-			if (++num_digits < 3) {
-				continue;
+		if (((unsigned int)(*q - '0')) <= 7) {
+			r = n * 8 + (*q - '0');
+			if (r <= UCHAR_MAX) {
+				n = r;
+				++q;
+				if (++num_digits < 3) {
+					continue;
+				}
 			}
 		}
 		break;
-- 
2.7.4