Virgin import of ntpd 4.0.98fvendor/ntp/4.0.98f

1 files changed, 100 insertions, 0 deletions

diff --git a/contrib/ntp/libntp/mstolfp.c b/contrib/ntp/libntp/mstolfp.c
new file mode 100644
index 000000000000..e4e909df7dbe
--- /dev/null
+++ b/contrib/ntp/libntp/mstolfp.c
@@ -0,0 +1,100 @@
+/*
+ * mstolfp - convert an ascii string in milliseconds to an l_fp number
+ */
+#include <stdio.h>
+#include <ctype.h>
+
+#include "ntp_fp.h"
+#include "ntp_stdlib.h"
+
+int
+mstolfp(
+	const char *str,
+	l_fp *lfp
+	)
+{
+	register const char *cp;
+	register char *bp;
+	register const char *cpdec;
+	char buf[100];
+
+	/*
+	 * We understand numbers of the form:
+	 *
+	 * [spaces][-][digits][.][digits][spaces|\n|\0]
+	 *
+	 * This is one enormous hack.  Since I didn't feel like
+	 * rewriting the decoding routine for milliseconds, what
+	 * is essentially done here is to make a copy of the string
+	 * with the decimal moved over three places so the seconds
+	 * decoding routine can be used.
+	 */
+	bp = buf;
+	cp = str;
+	while (isspace((int)*cp))
+	    cp++;
+	
+	if (*cp == '-') {
+		*bp++ = '-';
+		cp++;
+	}
+
+	if (*cp != '.' && !isdigit((int)*cp))
+	    return 0;
+
+
+	/*
+	 * Search forward for the decimal point or the end of the string.
+	 */
+	cpdec = cp;
+	while (isdigit((int)*cpdec))
+	    cpdec++;
+
+	/*
+	 * Found something.  If we have more than three digits copy the
+	 * excess over, else insert a leading 0.
+	 */
+	if ((cpdec - cp) > 3) {
+		do {
+			*bp++ = (char)*cp++;
+		} while ((cpdec - cp) > 3);
+	} else {
+		*bp++ = '0';
+	}
+
+	/*
+	 * Stick the decimal in.  If we've got less than three digits in
+	 * front of the millisecond decimal we insert the appropriate number
+	 * of zeros.
+	 */
+	*bp++ = '.';
+	if ((cpdec - cp) < 3) {
+		register int i = 3 - (cpdec - cp);
+
+		do {
+			*bp++ = '0';
+		} while (--i > 0);
+	}
+
+	/*
+	 * Copy the remainder up to the millisecond decimal.  If cpdec
+	 * is pointing at a decimal point, copy in the trailing number too.
+	 */
+	while (cp < cpdec)
+	    *bp++ = (char)*cp++;
+	
+	if (*cp == '.') {
+		cp++;
+		while (isdigit((int)*cp))
+		    *bp++ = (char)*cp++;
+	}
+	*bp = '\0';
+
+	/*
+	 * Check to make sure the string is properly terminated.  If
+	 * so, give the buffer to the decoding routine.
+	 */
+	if (*cp != '\0' && !isspace((int)*cp))
+	    return 0;
+	return atolfp(buf, lfp);
+}