strpct(3) - NetBSD Manual Pages

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STRPCT(3)               NetBSD Library Functions Manual              STRPCT(3)


NAME

     strpct, strspct -- decimal percent formatters


LIBRARY

     System Utilities Library (libutil, -lutil)


SYNOPSIS

     #include <util.h>

     char *
     strpct(char *buf, size_t bufsiz, uintmax_t numerator,
         uintmax_t denominator, size_t precision);

     char *
     strspct(char *buf, size_t bufsiz, intmax_t numerator,
         intmax_t denominator, size_t precision);


DESCRIPTION

     The strpct() function formats the fraction represented by numerator and
     denominator into a percentage representation with given number of digits
     of precision without using floating point arithmetic.


RETURN VALUES

     strpct() and strspct() always return a pointer to a NUL-terminated
     (unless buflen is 0) formatted string which is placed in buf and is up to
     buflen characters.  If there was an overflow, the formatted string will
     reflect that precision loss.


EXAMPLES

           strpct(buf, buflen, 1, 16, 3);
           => "6.250"
           strpct(buf, buflen, 1, 2, 0);
           => "50"


HISTORY

     strpct() was originally implemented in csh(1) for NetBSD 1.3.  It printed
     into a static buffer, was not locale aware, handled unsigned long num-
     bers, and printed a ``%'' at the end of the number.  Other programs such
     as df(1) and time(1) started using it.  strpct() and strspct() appeared
     separately in libutil for NetBSD 6.0.


AUTHORS

     Erik E. Fair <fair@netbsd.org>

NetBSD 6.0.1                    January 7, 2012                   NetBSD 6.0.1