1 files changed, 103 insertions, 0 deletions
diff --git a/lib/util/hexchar.c b/lib/util/hexchar.c
new file mode 100644
index 0000000..81cd619
--- /dev/null
+++ b/lib/util/hexchar.c
@@ -0,0 +1,103 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_util.h"
+
+/*
+ * Converts a two-byte hex string to decimal.
+ * Returns a value 0-255 on success or -1 for invalid input.
+ */
+int
+sudo_hexchar_v1(const char *s)
+{
+    unsigned char result[2];
+    int i;
+    debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL);
+
+    for (i = 0; i < 2; i++) {
+	switch (s[i]) {
+	case '0':
+	    result[i] = 0;
+	    break;
+	case '1':
+	    result[i] = 1;
+	    break;
+	case '2':
+	    result[i] = 2;
+	    break;
+	case '3':
+	    result[i] = 3;
+	    break;
+	case '4':
+	    result[i] = 4;
+	    break;
+	case '5':
+	    result[i] = 5;
+	    break;
+	case '6':
+	    result[i] = 6;
+	    break;
+	case '7':
+	    result[i] = 7;
+	    break;
+	case '8':
+	    result[i] = 8;
+	    break;
+	case '9':
+	    result[i] = 9;
+	    break;
+	case 'A':
+	case 'a':
+	    result[i] = 10;
+	    break;
+	case 'B':
+	case 'b':
+	    result[i] = 11;
+	    break;
+	case 'C':
+	case 'c':
+	    result[i] = 12;
+	    break;
+	case 'D':
+	case 'd':
+	    result[i] = 13;
+	    break;
+	case 'E':
+	case 'e':
+	    result[i] = 14;
+	    break;
+	case 'F':
+	case 'f':
+	    result[i] = 15;
+	    break;
+	default:
+	    /* Invalid input. */
+	    debug_return_int(-1);
+	}
+    }
+    debug_return_int((result[0] << 4) | result[1]);
+}