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-rw-r--r--debug/hex2bin.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/debug/hex2bin.c b/debug/hex2bin.c
new file mode 100644
index 00000000..ebfc289f
--- /dev/null
+++ b/debug/hex2bin.c
@@ -0,0 +1,54 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file hex2bin.c
+/// \brief Converts hexadecimal input strings to binary
+//
+// This code has been put into the public domain.
+//
+// This library 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include <stdio.h>
+#include <ctype.h>
+
+
+static int
+getbin(int x)
+{
+ if (x >= '0' && x <= '9')
+ return x - '0';
+
+ if (x >= 'A' && x <= 'F')
+ return x - 'A' + 10;
+
+ return x - 'a' + 10;
+}
+
+
+int
+main(void)
+{
+ while (true) {
+ int byte = getchar();
+ if (byte == EOF)
+ return 0;
+ if (!isxdigit(byte))
+ continue;
+
+ const int digit = getchar();
+ if (digit == EOF || !isxdigit(digit)) {
+ fprintf(stderr, "Invalid input\n");
+ return 1;
+ }
+
+ byte = (getbin(byte) << 4) | getbin(digit);
+ if (putchar(byte) == EOF) {
+ perror(NULL);
+ return 1;
+ }
+ }
+}