X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Fprocess_escape_sequence.c;h=138e751f568705b65e014d284de2cf5ea7cdd600;hb=d3d004dd3507f841745956a035fff68936378f9c;hp=9b57ff99e996df3d88d58f058ff9249f9b520d9e;hpb=ccfc44806dfd0a5cbc18fa89831ec81ce23f3582;p=oweals%2Fbusybox.git

diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c
index 9b57ff99e..138e751f5 100644
--- a/libbb/process_escape_sequence.c
+++ b/libbb/process_escape_sequence.c
@@ -5,65 +5,72 @@
  * Copyright (C) Manuel Novoa III <mjn3@codepoet.org>
  * and Vladimir Oleynik <dzo@simtreas.ru>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#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')
+#define WANT_HEX_ESCAPES 1
+
+/* Usual "this only works for ascii compatible encodings" disclaimer. */
+#undef _tolower
+#define _tolower(X) ((X)|((char) 0x20))
+
 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;
+	const char *p;
+	const char *q;
+	unsigned int num_digits;
+	unsigned int r;
+	unsigned int n;
+	unsigned int d;
+	unsigned int base;
+
+	num_digits = n = 0;
+	base = 8;
 	q = *ptr;
 
+#ifdef WANT_HEX_ESCAPES
 	if (*q == 'x') {
-		hexescape++;
 		++q;
+		base = 16;
+		++num_digits;
 	}
+#endif
 
 	do {
-		if (hexescape && isxdigit(*q)) {
-			r = n * 16 + hextobin(*q);
-		} else if (isodigit(*q)) {
-			r = n * 8 + octtobin(*q);
-		} else {
-			break;
+		d = (unsigned int)(*q - '0');
+#ifdef WANT_HEX_ESCAPES
+		if (d >= 10) {
+			d = ((unsigned int)(_tolower(*q) - 'a')) + 10;
 		}
-		if (r <= UCHAR_MAX) {
-			n = r;
-			++q;
-			if (++num_digits < 3) {
-				continue;
+#endif
+
+		if (d >= base) {
+#ifdef WANT_HEX_ESCAPES
+			if ((base == 16) && (!--num_digits)) {
+/*				return '\\'; */
+				--q;
 			}
+#endif
+			break;
 		}
-		break;
-	} while (1);
+
+		r = n * base + d;
+		if (r > UCHAR_MAX) {
+			break;
+		}
+
+		n = r;
+		++q;
+	} while (++num_digits < 3);
 
 	if (num_digits == 0) {	/* mnemonic escape sequence? */
 		p = charmap;
@@ -77,14 +84,6 @@ char bb_process_escape_sequence(const char **ptr)
 	}
 
 	*ptr = q;
+
 	return (char) n;
 }
-
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/