From 6b788edfa40fd9c006f071ce764677e9dd2f9384 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@tele2.at>
Date: Sun, 8 Apr 2018 16:12:24 +0200
Subject: Cleanup: rename/split splitkv.c

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
---
 lib/src/unescape.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 lib/src/unescape.c

(limited to 'lib/src/unescape.c')

diff --git a/lib/src/unescape.c b/lib/src/unescape.c
new file mode 100644
index 0000000..7508e2f
--- /dev/null
+++ b/lib/src/unescape.c
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "util.h"
+
+static int xdigit(int x)
+{
+	if (isupper(x))
+		return x - 'A' + 0x0A;
+	if (islower(x))
+		return x - 'a' + 0x0A;
+	return x - '0';
+}
+
+int unescape(char *src)
+{
+	char *dst = src;
+	int c;
+
+	for (;;) {
+		while (*src != '"' && *src != '\0')
+			*(dst++) = *(src++);
+
+		if (*src == '\0')
+			break;
+
+		++src;
+
+		while ((c = *(src++)) != '"') {
+			if (c == '\0')
+				return -1;
+
+			if (c == '\\') {
+				c = *(src++);
+
+				switch (c) {
+				case 'a': c = '\a'; break;
+				case 'b': c = '\b'; break;
+				case 'f': c = '\f'; break;
+				case 'n': c = '\n'; break;
+				case 't': c = '\t'; break;
+				case '\\':
+				case '"':
+					break;
+				case 'x':
+					c = 0;
+					if (isxdigit(*src))
+						c = (c<<4) | xdigit(*(src++));
+					if (isxdigit(*src))
+						c = (c<<4) | xdigit(*(src++));
+					break;
+				case '0':
+					c = 0;
+					if (isdigit(*src) && *src < '8')
+						c = (c<<3) | (*(src++) - '0');
+					if (isdigit(*src) && *src < '8')
+						c = (c<<3) | (*(src++) - '0');
+					if (isdigit(*src) && *src < '8')
+						c = (c<<3) | (*(src++) - '0');
+					break;
+				default:
+					return -1;
+				}
+			}
+
+			*(dst++) = c;
+		}
+	}
+
+	*(dst++) = '\0';
+	return 0;
+}
-- 
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