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