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-rw-r--r--plugins/sudoers/hexchar.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/plugins/sudoers/hexchar.c b/plugins/sudoers/hexchar.c
new file mode 100644
index 0000000..1813b66
--- /dev/null
+++ b/plugins/sudoers/hexchar.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2013-2015 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 <sys/types.h>
+#include <stdio.h>
+
+#include "sudoers.h"
+
+/*
+ * Converts a two-byte hex string to decimal.
+ * Returns the decimal value or -1 for invalid input.
+ */
+int
+hexchar(const char *s)
+{
+ unsigned char result[2];
+ int i;
+ debug_decl(hexchar, SUDOERS_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]);
+}