mirror of
https://github.com/dankamongmen/notcurses.git
synced 2024-11-16 00:13:00 +00:00
0d2c43603b
* uniblock-demo: reset background to black * warning about quantization * some luigi love * update cell documentation * add unit test for move of stdplane * MoveToLowerRight unit test * ncplane_move_yx(): error to move stdscr * better box permutations test * luigi in megaman2 world * stats: don't print 'em if we haven't got 'em
61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
#ifndef NOTCURSES_ENMETRIC
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#define NOTCURSES_ENMETRIC
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#ifdef __cplusplus
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extern "C" {
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#else
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#define RESTRICT restrict
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#endif
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#define PREFIXSTRLEN 7 // Does not include a '\0' (xxx.xxU)
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#define IPREFIXSTRLEN 8 // Does not include a '\0' (xxxx.xxU)
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#define BPREFIXSTRLEN 9 // Does not include a '\0' (xxxx.xxUi), i == prefix
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// A bit of the nasties here to stringize our preprocessor tokens just now
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// #defined, making them usable as printf(3) specifiers.
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#define STRHACK1(x) #x
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#define STRHACK2(x) STRHACK1(x)
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#define PREFIXFMT "%" STRHACK2(PREFIXSTRLEN) "s"
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#define IPREFIXFMT "%" STRHACK2(IPREFIXSTRLEN) "s"
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#define BPREFIXFMT "%" STRHACK2(BPREFIXSTRLEN) "s"
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// Takes an arbitrarily large number, and prints it into a fixed-size buffer by
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// adding the necessary SI suffix. Usually, pass a |[B]PREFIXSTRLEN+1|-sized
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// buffer to generate up to [B]PREFIXSTRLEN characters. The characteristic can
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// occupy up through |mult-1| characters (3 for 1000, 4 for 1024). The mantissa
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// can occupy either zero or two characters.
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//
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// Floating-point is never used, because an IEEE758 double can only losslessly
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// represent integers through 2^53-1.
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//
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// 2^64-1 is 18446744073709551615, 18.45E(xa). KMGTPEZY thus suffice to handle
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// a 89-bit uintmax_t. Beyond Z(etta) and Y(otta) lie lands unspecified by SI.
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//
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// val: value to print
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// decimal: scaling. '1' if none has taken place.
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// buf: buffer in which string will be generated
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// omitdec: inhibit printing of all-0 decimal portions
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// mult: base of suffix system (almost always 1000 or 1024)
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// uprefix: character to print following suffix ('i' for kibibytes basically).
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// only printed if suffix is actually printed (input >= mult).
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const char *enmetric(uintmax_t val, unsigned decimal, char *buf, int omitdec,
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unsigned mult, int uprefix);
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// Mega, kilo, gigabytes. Use PREFIXSTRLEN + 1.
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static inline const char *
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qprefix(uintmax_t val, unsigned decimal, char *buf, int omitdec){
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return enmetric(val, decimal, buf, omitdec, 1000, '\0');
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}
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// Mibi, kebi, gibibytes. Use BPREFIXSTRLEN + 1.
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static inline const char *
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bprefix(uintmax_t val, unsigned decimal, char *buf, int omitdec){
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return enmetric(val, decimal, buf, omitdec, 1024, 'i');
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif
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