1 files changed, 159 insertions, 0 deletions
diff --git a/libntp/dofptoa.c b/libntp/dofptoa.c
new file mode 100644
index 0000000..758af2f
--- /dev/null
+++ b/libntp/dofptoa.c
@@ -0,0 +1,159 @@
+/*
+ * dofptoa - do the grunge work to convert an fp number to ascii
+ */
+#include <config.h>
+#include <stdio.h>
+
+#include "ntp_fp.h"
+#include "lib_strbuf.h"
+#include "ntp_string.h"
+#include "ntp_stdlib.h"
+
+char *
+dofptoa(
+	u_fp fpv,
+	int neg,
+	short ndec,
+	int msec
+	)
+{
+	register u_char *cp, *cpend;
+	register u_long val;
+	register short dec;
+	u_char cbuf[12];
+	u_char *cpdec;
+	char *buf;
+	char *bp;
+
+	/*
+	 * Get a string buffer before starting
+	 */
+	LIB_GETBUF(buf);
+
+	/*
+	 * Zero out the buffer
+	 */
+	ZERO(cbuf);
+
+	/*
+	 * Set the pointers to point at the first
+	 * decimal place.  Get a local copy of the value.
+	 */
+	cp = cpend = &cbuf[5];
+	val = fpv;
+
+	/*
+	 * If we have to, decode the integral part
+	 */
+	if (!(val & 0xffff0000))
+	    cp--;
+	else {
+		register u_short sv = (u_short)(val >> 16);
+		register u_short tmp;
+		register u_short ten = 10;
+
+		do {
+			tmp = sv;
+			sv = (u_short) (sv/ten);
+			*(--cp) = (u_char)(tmp - ((sv<<3) + (sv<<1)));
+		} while (sv != 0);
+	}
+
+	/*
+	 * Figure out how much of the fraction to do
+	 */
+	if (msec) {
+		dec = (short)(ndec + 3);
+		if (dec < 3)
+		    dec = 3;
+		cpdec = &cbuf[8];
+	} else {
+		dec = ndec;
+		cpdec = cpend;
+	}
+
+	if (dec > 6)
+	    dec = 6;
+	
+	if (dec > 0) {
+		do {
+			val &= 0xffff;
+			val = (val << 3) + (val << 1);
+			*cpend++ = (u_char)(val >> 16);
+		} while (--dec > 0);
+	}
+
+	if (val & 0x8000) {
+		register u_char *tp;
+		/*
+		 * Round it. Ick.
+		 */
+		tp = cpend;
+		*(--tp) += 1;
+		while (*tp >= 10) {
+			*tp = 0;
+			*(--tp) += 1;
+		}
+	}
+
+	/*
+	 * Remove leading zeroes if necessary
+	 */
+	while (cp < (cpdec -1) && *cp == 0)
+	    cp++;
+	
+	/*
+	 * Copy it into the buffer, asciizing as we go.
+	 */
+	bp = buf;
+	if (neg)
+	    *bp++ = '-';
+	
+	while (cp < cpend) {
+		if (cp == cpdec)
+		    *bp++ = '.';
+		*bp++ = (char)(*cp++ + '0');
+	}
+	*bp = '\0';
+	return buf;
+}
+
+
+char *
+fptoa(
+	s_fp	fpv,
+	short	ndec
+	)
+{
+	u_fp	plusfp;
+	int	neg;
+
+	neg = (fpv < 0);
+	if (neg) {
+		plusfp = (u_fp)(-fpv);
+	} else {
+		plusfp = (u_fp)fpv;
+	}
+
+	return dofptoa(plusfp, neg, ndec, FALSE);
+}
+
+
+char *
+fptoms(
+	s_fp	fpv,
+	short	ndec
+	)
+{
+	u_fp	plusfp;
+	int	neg;
+
+	neg = (fpv < 0);
+	if (neg) {
+		plusfp = (u_fp)(-fpv);
+	} else {
+		plusfp = (u_fp)fpv;
+	}
+
+	return dofptoa(plusfp, neg, ndec, TRUE);
+}