initial checkout from wrc

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/cvtoct.c b/lib/cvtoct.c
new file mode 100644
index 0000000..dafd8ff
--- /dev/null
+++ b/lib/cvtoct.c
@@ -0,0 +1,54 @@
+/**
+** @file	cvtoct.c
+**
+** @author	Numerous CSCI-452 classes
+**
+** @brief	C implementations of common library functions
+*/
+
+#ifndef CVTOCT_SRC_INC
+#define CVTOCT_SRC_INC
+
+#include <common.h>
+
+#include <lib.h>
+
+/**
+** cvtoct(buf,value)
+**
+** convert a 32-bit unsigned value into a mininal-length (up to
+** 11-character) NUL-terminated character string
+**
+** @param buf   Destination buffer
+** @param value Value to convert
+**
+** @return The number of characters placed into the buffer
+**          (not including the NUL)
+**
+** NOTE:  assumes buf is large enough to hold the resulting string
+*/
+int cvtoct( char *buf, uint32_t value ) {
+	int i;
+	int chars_stored = 0;
+	char *bp = buf;
+	uint32_t val;
+
+	val = ( value & 0xc0000000 );
+	val >>= 30;
+	for( i = 0; i < 11; i += 1 ){
+
+		if( i == 10 || val != 0 || chars_stored ) {
+			chars_stored = 1;
+			val &= 0x7;
+			*bp++ = val + '0';
+		}
+		value <<= 3;
+		val = ( value & 0xe0000000 );
+		val >>= 29;
+	}
+	*bp = '\0';
+
+	return bp - buf;
+}
+
+#endif