Modernize the build system.

[tinc] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
new file mode 100644 (file)
index 0000000..3b221f5
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,80 @@
+/*
+    utils.c -- gathering of some stupid small functions
+    Copyright (C) 1999-2005 Ivo Timmermans
+                  2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+
+    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.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "system.h"
+
+#include "../src/logger.h"
+#include "utils.h"
+
+static const char hexadecimals[] = "0123456789ABCDEF";
+
+static int charhex2bin(char c) {
+       if(isdigit(c))
+               return c - '0';
+       else
+               return toupper(c) - 'A' + 10;
+}
+
+bool hex2bin(char *src, char *dst, int length) {
+       for(int i = 0; i < length; i++) {
+               if(!isxdigit(src[i * 2]) || !isxdigit(src[i * 2 + 1]))
+                       return false;
+               dst[i] = charhex2bin(src[i * 2]) * 16 + charhex2bin(src[i * 2 + 1]);
+       }
+       return true;
+}
+
+void bin2hex(char *src, char *dst, int length) {
+       int i;
+       for(i = length - 1; i >= 0; i--) {
+               dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15];
+               dst[i * 2] = hexadecimals[(unsigned char) src[i] >> 4];
+       }
+}
+
+#if defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
+#ifdef HAVE_CYGWIN
+#include <w32api/windows.h>
+#endif
+
+const char *winerror(int err) {
+       static char buf[1024], *ptr;
+
+       ptr = buf + sprintf(buf, "(%d) ", err);
+
+       if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+               NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), ptr, sizeof(buf) - (ptr - buf), NULL)) {
+               strcpy(ptr, "(unable to format errormessage)");
+       };
+
+       if((ptr = strchr(buf, '\r')))
+               *ptr = '\0';
+
+       return buf;
+}
+#endif
+
+unsigned int bitfield_to_int(const void *bitfield, size_t size) {
+       unsigned int value = 0;
+       if(size > sizeof value)
+               size = sizeof value;
+       memcpy(&value, bitfield, size);
+       return value;
+}