mirror of
https://github.com/nothings/stb
synced 2024-12-15 04:22:35 +03:00
1878 lines
56 KiB
C
1878 lines
56 KiB
C
// stb_sprintf - v1.06 - public domain snprintf() implementation
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// originally by Jeff Roberts / RAD Game Tools, 2015/10/20
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// http://github.com/nothings/stb
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//
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// allowed types: sc uidBboXx p AaGgEef n
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// lengths : hh h ll j z t I64 I32 I
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//
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// Contributors:
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// Fabian "ryg" Giesen (reformatting)
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//
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// Contributors (bugfixes):
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// github:d26435
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// github:trex78
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// github:account-login
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// Jari Komppa (SI suffixes)
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// Rohit Nirmal
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// Marcin Wojdyr
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// Leonard Ritter
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// Stefano Zanotti
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// Adam Allison
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// Arvid Gerstmann
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// Markus Kolb
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//
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// LICENSE:
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//
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// See end of file for license information.
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#ifndef STB_SPRINTF_H_INCLUDE
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#define STB_SPRINTF_H_INCLUDE
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/*
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Single file sprintf replacement.
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Originally written by Jeff Roberts at RAD Game Tools - 2015/10/20.
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Hereby placed in public domain.
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This is a full sprintf replacement that supports everything that
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the C runtime sprintfs support, including float/double, 64-bit integers,
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hex floats, field parameters (%*.*d stuff), length reads backs, etc.
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Why would you need this if sprintf already exists? Well, first off,
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it's *much* faster (see below). It's also much smaller than the CRT
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versions code-space-wise. We've also added some simple improvements
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that are super handy (commas in thousands, callbacks at buffer full,
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for example). Finally, the format strings for MSVC and GCC differ
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for 64-bit integers (among other small things), so this lets you use
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the same format strings in cross platform code.
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It uses the standard single file trick of being both the header file
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and the source itself. If you just include it normally, you just get
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the header file function definitions. To get the code, you include
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it from a C or C++ file and define STB_SPRINTF_IMPLEMENTATION first.
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It only uses va_args macros from the C runtime to do it's work. It
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does cast doubles to S64s and shifts and divides U64s, which does
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drag in CRT code on most platforms.
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It compiles to roughly 8K with float support, and 4K without.
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As a comparison, when using MSVC static libs, calling sprintf drags
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in 16K.
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API:
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====
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int stbsp_sprintf( char * buf, char const * fmt, ... )
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int stbsp_snprintf( char * buf, int count, char const * fmt, ... )
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Convert an arg list into a buffer. stbsp_snprintf always returns
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a zero-terminated string (unlike regular snprintf).
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int stbsp_vsprintf( char * buf, char const * fmt, va_list va )
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int stbsp_vsnprintf( char * buf, int count, char const * fmt, va_list va )
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Convert a va_list arg list into a buffer. stbsp_vsnprintf always returns
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a zero-terminated string (unlike regular snprintf).
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int stbsp_vsprintfcb( STBSP_SPRINTFCB * callback, void * user, char * buf, char const * fmt, va_list va )
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typedef char * STBSP_SPRINTFCB( char const * buf, void * user, int len );
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Convert into a buffer, calling back every STB_SPRINTF_MIN chars.
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Your callback can then copy the chars out, print them or whatever.
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This function is actually the workhorse for everything else.
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The buffer you pass in must hold at least STB_SPRINTF_MIN characters.
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// you return the next buffer to use or 0 to stop converting
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void stbsp_set_separators( char comma, char period )
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Set the comma and period characters to use.
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FLOATS/DOUBLES:
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===============
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This code uses a internal float->ascii conversion method that uses
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doubles with error correction (double-doubles, for ~105 bits of
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precision). This conversion is round-trip perfect - that is, an atof
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of the values output here will give you the bit-exact double back.
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One difference is that our insignificant digits will be different than
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with MSVC or GCC (but they don't match each other either). We also
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don't attempt to find the minimum length matching float (pre-MSVC15
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doesn't either).
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If you don't need float or doubles at all, define STB_SPRINTF_NOFLOAT
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and you'll save 4K of code space.
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64-BIT INTS:
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============
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This library also supports 64-bit integers and you can use MSVC style or
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GCC style indicators (%I64d or %lld). It supports the C99 specifiers
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for size_t and ptr_diff_t (%jd %zd) as well.
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EXTRAS:
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=======
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Like some GCCs, for integers and floats, you can use a ' (single quote)
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specifier and commas will be inserted on the thousands: "%'d" on 12345
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would print 12,345.
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For integers and floats, you can use a "$" specifier and the number
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will be converted to float and then divided to get kilo, mega, giga or
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tera and then printed, so "%$d" 1000 is "1.0 k", "%$.2d" 2536000 is
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"2.53 M", etc. For byte values, use two $:s, like "%$$d" to turn
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2536000 to "2.42 Mi". If you prefer JEDEC suffixes to SI ones, use three
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$:s: "%$$$d" -> "2.42 M". To remove the space between the number and the
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suffix, add "_" specifier: "%_$d" -> "2.53M".
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In addition to octal and hexadecimal conversions, you can print
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integers in binary: "%b" for 256 would print 100.
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PERFORMANCE vs MSVC 2008 32-/64-bit (GCC is even slower than MSVC):
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===================================================================
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"%d" across all 32-bit ints (4.8x/4.0x faster than 32-/64-bit MSVC)
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"%24d" across all 32-bit ints (4.5x/4.2x faster)
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"%x" across all 32-bit ints (4.5x/3.8x faster)
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"%08x" across all 32-bit ints (4.3x/3.8x faster)
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"%f" across e-10 to e+10 floats (7.3x/6.0x faster)
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"%e" across e-10 to e+10 floats (8.1x/6.0x faster)
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"%g" across e-10 to e+10 floats (10.0x/7.1x faster)
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"%f" for values near e-300 (7.9x/6.5x faster)
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"%f" for values near e+300 (10.0x/9.1x faster)
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"%e" for values near e-300 (10.1x/7.0x faster)
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"%e" for values near e+300 (9.2x/6.0x faster)
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"%.320f" for values near e-300 (12.6x/11.2x faster)
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"%a" for random values (8.6x/4.3x faster)
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"%I64d" for 64-bits with 32-bit values (4.8x/3.4x faster)
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"%I64d" for 64-bits > 32-bit values (4.9x/5.5x faster)
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"%s%s%s" for 64 char strings (7.1x/7.3x faster)
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"...512 char string..." ( 35.0x/32.5x faster!)
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*/
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#if defined(__clang__)
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#if defined(__has_feature) && defined(__has_attribute)
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#if __has_feature(address_sanitizer)
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#if __has_attribute(__no_sanitize__)
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#define STBSP__ASAN __attribute__((__no_sanitize__("address")))
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#elif __has_attribute(__no_sanitize_address__)
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#define STBSP__ASAN __attribute__((__no_sanitize_address__))
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#elif __has_attribute(__no_address_safety_analysis__)
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#define STBSP__ASAN __attribute__((__no_address_safety_analysis__))
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#endif
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#endif
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#endif
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#elif __GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
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#if __SANITIZE_ADDRESS__
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#define STBSP__ASAN __attribute__((__no_sanitize_address__))
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#endif
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#endif
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#ifndef STBSP__ASAN
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#define STBSP__ASAN
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#endif
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#ifdef STB_SPRINTF_STATIC
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#define STBSP__PUBLICDEC static
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#define STBSP__PUBLICDEF static STBSP__ASAN
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#else
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#ifdef __cplusplus
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#define STBSP__PUBLICDEC extern "C"
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#define STBSP__PUBLICDEF extern "C" STBSP__ASAN
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#else
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#define STBSP__PUBLICDEC extern
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#define STBSP__PUBLICDEF STBSP__ASAN
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#endif
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#endif
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#include <stdarg.h> // for va_list()
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#include <stddef.h> // size_t, ptrdiff_t
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#ifndef STB_SPRINTF_MIN
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#define STB_SPRINTF_MIN 512 // how many characters per callback
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#endif
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typedef char *STBSP_SPRINTFCB(char *buf, void *user, int len);
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#ifndef STB_SPRINTF_DECORATE
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#define STB_SPRINTF_DECORATE(name) stbsp_##name // define this before including if you want to change the names
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#endif
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintf)(char *buf, char const *fmt, va_list va);
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsnprintf)(char *buf, int count, char const *fmt, va_list va);
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(sprintf)(char *buf, char const *fmt, ...);
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(snprintf)(char *buf, int count, char const *fmt, ...);
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintfcb)(STBSP_SPRINTFCB *callback, void *user, char *buf, char const *fmt, va_list va);
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STBSP__PUBLICDEF void STB_SPRINTF_DECORATE(set_separators)(char comma, char period);
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#endif // STB_SPRINTF_H_INCLUDE
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#ifdef STB_SPRINTF_IMPLEMENTATION
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#include <stdlib.h> // for va_arg()
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#define stbsp__uint32 unsigned int
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#define stbsp__int32 signed int
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#ifdef _MSC_VER
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#define stbsp__uint64 unsigned __int64
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#define stbsp__int64 signed __int64
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#else
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#define stbsp__uint64 unsigned long long
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#define stbsp__int64 signed long long
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#endif
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#define stbsp__uint16 unsigned short
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#ifndef stbsp__uintptr
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#if defined(__ppc64__) || defined(__powerpc64__) || defined(__aarch64__) || defined(_M_X64) || defined(__x86_64__) || defined(__x86_64)
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#define stbsp__uintptr stbsp__uint64
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#else
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#define stbsp__uintptr stbsp__uint32
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#endif
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#endif
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#ifndef STB_SPRINTF_MSVC_MODE // used for MSVC2013 and earlier (MSVC2015 matches GCC)
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#if defined(_MSC_VER) && (_MSC_VER < 1900)
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#define STB_SPRINTF_MSVC_MODE
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#endif
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#endif
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#ifdef STB_SPRINTF_NOUNALIGNED // define this before inclusion to force stbsp_sprintf to always use aligned accesses
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#define STBSP__UNALIGNED(code)
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#else
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#define STBSP__UNALIGNED(code) code
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#endif
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#ifndef STB_SPRINTF_NOFLOAT
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// internal float utility functions
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static stbsp__int32 stbsp__real_to_str(char const **start, stbsp__uint32 *len, char *out, stbsp__int32 *decimal_pos, double value, stbsp__uint32 frac_digits);
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static stbsp__int32 stbsp__real_to_parts(stbsp__int64 *bits, stbsp__int32 *expo, double value);
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#define STBSP__SPECIAL 0x7000
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#endif
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static char stbsp__period = '.';
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static char stbsp__comma = ',';
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static struct
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{
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short temp; // force next field to be 2-byte aligned
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char pair[201];
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} stbsp__digitpair =
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{
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0,
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"00010203040506070809101112131415161718192021222324"
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"25262728293031323334353637383940414243444546474849"
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"50515253545556575859606162636465666768697071727374"
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"75767778798081828384858687888990919293949596979899"
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};
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STBSP__PUBLICDEF void STB_SPRINTF_DECORATE(set_separators)(char pcomma, char pperiod)
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{
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stbsp__period = pperiod;
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stbsp__comma = pcomma;
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}
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#define STBSP__LEFTJUST 1
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#define STBSP__LEADINGPLUS 2
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#define STBSP__LEADINGSPACE 4
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#define STBSP__LEADING_0X 8
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#define STBSP__LEADINGZERO 16
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#define STBSP__INTMAX 32
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#define STBSP__TRIPLET_COMMA 64
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#define STBSP__NEGATIVE 128
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#define STBSP__METRIC_SUFFIX 256
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#define STBSP__HALFWIDTH 512
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#define STBSP__METRIC_NOSPACE 1024
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#define STBSP__METRIC_1024 2048
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#define STBSP__METRIC_JEDEC 4096
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static void stbsp__lead_sign(stbsp__uint32 fl, char *sign)
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{
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sign[0] = 0;
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if (fl & STBSP__NEGATIVE) {
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sign[0] = 1;
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sign[1] = '-';
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} else if (fl & STBSP__LEADINGSPACE) {
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sign[0] = 1;
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sign[1] = ' ';
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} else if (fl & STBSP__LEADINGPLUS) {
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sign[0] = 1;
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sign[1] = '+';
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}
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}
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STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintfcb)(STBSP_SPRINTFCB *callback, void *user, char *buf, char const *fmt, va_list va)
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{
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static char hex[] = "0123456789abcdefxp";
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static char hexu[] = "0123456789ABCDEFXP";
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char *bf;
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char const *f;
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int tlen = 0;
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bf = buf;
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f = fmt;
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for (;;) {
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stbsp__int32 fw, pr, tz;
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stbsp__uint32 fl;
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// macros for the callback buffer stuff
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#define stbsp__chk_cb_bufL(bytes) \
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{ \
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int len = (int)(bf - buf); \
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if ((len + (bytes)) >= STB_SPRINTF_MIN) { \
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tlen += len; \
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if (0 == (bf = buf = callback(buf, user, len))) \
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goto done; \
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} \
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}
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#define stbsp__chk_cb_buf(bytes) \
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{ \
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if (callback) { \
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stbsp__chk_cb_bufL(bytes); \
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} \
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}
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#define stbsp__flush_cb() \
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{ \
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stbsp__chk_cb_bufL(STB_SPRINTF_MIN - 1); \
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} // flush if there is even one byte in the buffer
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#define stbsp__cb_buf_clamp(cl, v) \
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cl = v; \
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if (callback) { \
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int lg = STB_SPRINTF_MIN - (int)(bf - buf); \
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if (cl > lg) \
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cl = lg; \
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}
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// fast copy everything up to the next % (or end of string)
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for (;;) {
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while (((stbsp__uintptr)f) & 3) {
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schk1:
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if (f[0] == '%')
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goto scandd;
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schk2:
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if (f[0] == 0)
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goto endfmt;
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stbsp__chk_cb_buf(1);
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*bf++ = f[0];
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++f;
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}
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for (;;) {
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// Check if the next 4 bytes contain %(0x25) or end of string.
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// Using the 'hasless' trick:
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// https://graphics.stanford.edu/~seander/bithacks.html#HasLessInWord
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stbsp__uint32 v, c;
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v = *(stbsp__uint32 *)f;
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c = (~v) & 0x80808080;
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if (((v ^ 0x25252525) - 0x01010101) & c)
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goto schk1;
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if ((v - 0x01010101) & c)
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goto schk2;
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if (callback)
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if ((STB_SPRINTF_MIN - (int)(bf - buf)) < 4)
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goto schk1;
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#ifdef STB_SPRINTF_NOUNALIGNED
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if(((stbsp__uintptr)bf) & 3) {
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bf[0] = f[0];
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bf[1] = f[1];
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bf[2] = f[2];
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bf[3] = f[3];
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} else
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#endif
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{
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*(stbsp__uint32 *)bf = v;
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}
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bf += 4;
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f += 4;
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}
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}
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scandd:
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++f;
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// ok, we have a percent, read the modifiers first
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fw = 0;
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pr = -1;
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fl = 0;
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tz = 0;
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// flags
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for (;;) {
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switch (f[0]) {
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// if we have left justify
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case '-':
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fl |= STBSP__LEFTJUST;
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++f;
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continue;
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// if we have leading plus
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case '+':
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fl |= STBSP__LEADINGPLUS;
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++f;
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continue;
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// if we have leading space
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case ' ':
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fl |= STBSP__LEADINGSPACE;
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++f;
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continue;
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// if we have leading 0x
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case '#':
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fl |= STBSP__LEADING_0X;
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++f;
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continue;
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// if we have thousand commas
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case '\'':
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fl |= STBSP__TRIPLET_COMMA;
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++f;
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continue;
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// if we have kilo marker (none->kilo->kibi->jedec)
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case '$':
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if (fl & STBSP__METRIC_SUFFIX) {
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if (fl & STBSP__METRIC_1024) {
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fl |= STBSP__METRIC_JEDEC;
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} else {
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fl |= STBSP__METRIC_1024;
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}
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} else {
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fl |= STBSP__METRIC_SUFFIX;
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}
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++f;
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continue;
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// if we don't want space between metric suffix and number
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case '_':
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fl |= STBSP__METRIC_NOSPACE;
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++f;
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continue;
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// if we have leading zero
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case '0':
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fl |= STBSP__LEADINGZERO;
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++f;
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goto flags_done;
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default: goto flags_done;
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}
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}
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flags_done:
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// get the field width
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if (f[0] == '*') {
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fw = va_arg(va, stbsp__uint32);
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++f;
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} else {
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while ((f[0] >= '0') && (f[0] <= '9')) {
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fw = fw * 10 + f[0] - '0';
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f++;
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}
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}
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// get the precision
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if (f[0] == '.') {
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++f;
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if (f[0] == '*') {
|
|
pr = va_arg(va, stbsp__uint32);
|
|
++f;
|
|
} else {
|
|
pr = 0;
|
|
while ((f[0] >= '0') && (f[0] <= '9')) {
|
|
pr = pr * 10 + f[0] - '0';
|
|
f++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// handle integer size overrides
|
|
switch (f[0]) {
|
|
// are we halfwidth?
|
|
case 'h':
|
|
fl |= STBSP__HALFWIDTH;
|
|
++f;
|
|
if (f[0] == 'h')
|
|
++f; // QUARTERWIDTH
|
|
break;
|
|
// are we 64-bit (unix style)
|
|
case 'l':
|
|
fl |= ((sizeof(long) == 8) ? STBSP__INTMAX : 0);
|
|
++f;
|
|
if (f[0] == 'l') {
|
|
fl |= STBSP__INTMAX;
|
|
++f;
|
|
}
|
|
break;
|
|
// are we 64-bit on intmax? (c99)
|
|
case 'j':
|
|
fl |= (sizeof(size_t) == 8) ? STBSP__INTMAX : 0;
|
|
++f;
|
|
break;
|
|
// are we 64-bit on size_t or ptrdiff_t? (c99)
|
|
case 'z':
|
|
fl |= (sizeof(ptrdiff_t) == 8) ? STBSP__INTMAX : 0;
|
|
++f;
|
|
break;
|
|
case 't':
|
|
fl |= (sizeof(ptrdiff_t) == 8) ? STBSP__INTMAX : 0;
|
|
++f;
|
|
break;
|
|
// are we 64-bit (msft style)
|
|
case 'I':
|
|
if ((f[1] == '6') && (f[2] == '4')) {
|
|
fl |= STBSP__INTMAX;
|
|
f += 3;
|
|
} else if ((f[1] == '3') && (f[2] == '2')) {
|
|
f += 3;
|
|
} else {
|
|
fl |= ((sizeof(void *) == 8) ? STBSP__INTMAX : 0);
|
|
++f;
|
|
}
|
|
break;
|
|
default: break;
|
|
}
|
|
|
|
// handle each replacement
|
|
switch (f[0]) {
|
|
#define STBSP__NUMSZ 512 // big enough for e308 (with commas) or e-307
|
|
char num[STBSP__NUMSZ];
|
|
char lead[8];
|
|
char tail[8];
|
|
char *s;
|
|
char const *h;
|
|
stbsp__uint32 l, n, cs;
|
|
stbsp__uint64 n64;
|
|
#ifndef STB_SPRINTF_NOFLOAT
|
|
double fv;
|
|
#endif
|
|
stbsp__int32 dp;
|
|
char const *sn;
|
|
|
|
case 's':
|
|
// get the string
|
|
s = va_arg(va, char *);
|
|
if (s == 0)
|
|
s = (char *)"null";
|
|
// get the length
|
|
sn = s;
|
|
for (;;) {
|
|
if ((((stbsp__uintptr)sn) & 3) == 0)
|
|
break;
|
|
lchk:
|
|
if (sn[0] == 0)
|
|
goto ld;
|
|
++sn;
|
|
}
|
|
n = 0xffffffff;
|
|
if (pr >= 0) {
|
|
n = (stbsp__uint32)(sn - s);
|
|
if (n >= (stbsp__uint32)pr)
|
|
goto ld;
|
|
n = ((stbsp__uint32)(pr - n)) >> 2;
|
|
}
|
|
while (n) {
|
|
stbsp__uint32 v = *(stbsp__uint32 *)sn;
|
|
if ((v - 0x01010101) & (~v) & 0x80808080UL)
|
|
goto lchk;
|
|
sn += 4;
|
|
--n;
|
|
}
|
|
goto lchk;
|
|
ld:
|
|
|
|
l = (stbsp__uint32)(sn - s);
|
|
// clamp to precision
|
|
if (l > (stbsp__uint32)pr)
|
|
l = pr;
|
|
lead[0] = 0;
|
|
tail[0] = 0;
|
|
pr = 0;
|
|
dp = 0;
|
|
cs = 0;
|
|
// copy the string in
|
|
goto scopy;
|
|
|
|
case 'c': // char
|
|
// get the character
|
|
s = num + STBSP__NUMSZ - 1;
|
|
*s = (char)va_arg(va, int);
|
|
l = 1;
|
|
lead[0] = 0;
|
|
tail[0] = 0;
|
|
pr = 0;
|
|
dp = 0;
|
|
cs = 0;
|
|
goto scopy;
|
|
|
|
case 'n': // weird write-bytes specifier
|
|
{
|
|
int *d = va_arg(va, int *);
|
|
*d = tlen + (int)(bf - buf);
|
|
} break;
|
|
|
|
#ifdef STB_SPRINTF_NOFLOAT
|
|
case 'A': // float
|
|
case 'a': // hex float
|
|
case 'G': // float
|
|
case 'g': // float
|
|
case 'E': // float
|
|
case 'e': // float
|
|
case 'f': // float
|
|
va_arg(va, double); // eat it
|
|
s = (char *)"No float";
|
|
l = 8;
|
|
lead[0] = 0;
|
|
tail[0] = 0;
|
|
pr = 0;
|
|
dp = 0;
|
|
cs = 0;
|
|
goto scopy;
|
|
#else
|
|
case 'A': // hex float
|
|
case 'a': // hex float
|
|
h = (f[0] == 'A') ? hexu : hex;
|
|
fv = va_arg(va, double);
|
|
if (pr == -1)
|
|
pr = 6; // default is 6
|
|
// read the double into a string
|
|
if (stbsp__real_to_parts((stbsp__int64 *)&n64, &dp, fv))
|
|
fl |= STBSP__NEGATIVE;
|
|
|
|
s = num + 64;
|
|
|
|
stbsp__lead_sign(fl, lead);
|
|
|
|
if (dp == -1023)
|
|
dp = (n64) ? -1022 : 0;
|
|
else
|
|
n64 |= (((stbsp__uint64)1) << 52);
|
|
n64 <<= (64 - 56);
|
|
if (pr < 15)
|
|
n64 += ((((stbsp__uint64)8) << 56) >> (pr * 4));
|
|
// add leading chars
|
|
|
|
#ifdef STB_SPRINTF_MSVC_MODE
|
|
*s++ = '0';
|
|
*s++ = 'x';
|
|
#else
|
|
lead[1 + lead[0]] = '0';
|
|
lead[2 + lead[0]] = 'x';
|
|
lead[0] += 2;
|
|
#endif
|
|
*s++ = h[(n64 >> 60) & 15];
|
|
n64 <<= 4;
|
|
if (pr)
|
|
*s++ = stbsp__period;
|
|
sn = s;
|
|
|
|
// print the bits
|
|
n = pr;
|
|
if (n > 13)
|
|
n = 13;
|
|
if (pr > (stbsp__int32)n)
|
|
tz = pr - n;
|
|
pr = 0;
|
|
while (n--) {
|
|
*s++ = h[(n64 >> 60) & 15];
|
|
n64 <<= 4;
|
|
}
|
|
|
|
// print the expo
|
|
tail[1] = h[17];
|
|
if (dp < 0) {
|
|
tail[2] = '-';
|
|
dp = -dp;
|
|
} else
|
|
tail[2] = '+';
|
|
n = (dp >= 1000) ? 6 : ((dp >= 100) ? 5 : ((dp >= 10) ? 4 : 3));
|
|
tail[0] = (char)n;
|
|
for (;;) {
|
|
tail[n] = '0' + dp % 10;
|
|
if (n <= 3)
|
|
break;
|
|
--n;
|
|
dp /= 10;
|
|
}
|
|
|
|
dp = (int)(s - sn);
|
|
l = (int)(s - (num + 64));
|
|
s = num + 64;
|
|
cs = 1 + (3 << 24);
|
|
goto scopy;
|
|
|
|
case 'G': // float
|
|
case 'g': // float
|
|
h = (f[0] == 'G') ? hexu : hex;
|
|
fv = va_arg(va, double);
|
|
if (pr == -1)
|
|
pr = 6;
|
|
else if (pr == 0)
|
|
pr = 1; // default is 6
|
|
// read the double into a string
|
|
if (stbsp__real_to_str(&sn, &l, num, &dp, fv, (pr - 1) | 0x80000000))
|
|
fl |= STBSP__NEGATIVE;
|
|
|
|
// clamp the precision and delete extra zeros after clamp
|
|
n = pr;
|
|
if (l > (stbsp__uint32)pr)
|
|
l = pr;
|
|
while ((l > 1) && (pr) && (sn[l - 1] == '0')) {
|
|
--pr;
|
|
--l;
|
|
}
|
|
|
|
// should we use %e
|
|
if ((dp <= -4) || (dp > (stbsp__int32)n)) {
|
|
if (pr > (stbsp__int32)l)
|
|
pr = l - 1;
|
|
else if (pr)
|
|
--pr; // when using %e, there is one digit before the decimal
|
|
goto doexpfromg;
|
|
}
|
|
// this is the insane action to get the pr to match %g semantics for %f
|
|
if (dp > 0) {
|
|
pr = (dp < (stbsp__int32)l) ? l - dp : 0;
|
|
} else {
|
|
pr = -dp + ((pr > (stbsp__int32)l) ? (stbsp__int32) l : pr);
|
|
}
|
|
goto dofloatfromg;
|
|
|
|
case 'E': // float
|
|
case 'e': // float
|
|
h = (f[0] == 'E') ? hexu : hex;
|
|
fv = va_arg(va, double);
|
|
if (pr == -1)
|
|
pr = 6; // default is 6
|
|
// read the double into a string
|
|
if (stbsp__real_to_str(&sn, &l, num, &dp, fv, pr | 0x80000000))
|
|
fl |= STBSP__NEGATIVE;
|
|
doexpfromg:
|
|
tail[0] = 0;
|
|
stbsp__lead_sign(fl, lead);
|
|
if (dp == STBSP__SPECIAL) {
|
|
s = (char *)sn;
|
|
cs = 0;
|
|
pr = 0;
|
|
goto scopy;
|
|
}
|
|
s = num + 64;
|
|
// handle leading chars
|
|
*s++ = sn[0];
|
|
|
|
if (pr)
|
|
*s++ = stbsp__period;
|
|
|
|
// handle after decimal
|
|
if ((l - 1) > (stbsp__uint32)pr)
|
|
l = pr + 1;
|
|
for (n = 1; n < l; n++)
|
|
*s++ = sn[n];
|
|
// trailing zeros
|
|
tz = pr - (l - 1);
|
|
pr = 0;
|
|
// dump expo
|
|
tail[1] = h[0xe];
|
|
dp -= 1;
|
|
if (dp < 0) {
|
|
tail[2] = '-';
|
|
dp = -dp;
|
|
} else
|
|
tail[2] = '+';
|
|
#ifdef STB_SPRINTF_MSVC_MODE
|
|
n = 5;
|
|
#else
|
|
n = (dp >= 100) ? 5 : 4;
|
|
#endif
|
|
tail[0] = (char)n;
|
|
for (;;) {
|
|
tail[n] = '0' + dp % 10;
|
|
if (n <= 3)
|
|
break;
|
|
--n;
|
|
dp /= 10;
|
|
}
|
|
cs = 1 + (3 << 24); // how many tens
|
|
goto flt_lead;
|
|
|
|
case 'f': // float
|
|
fv = va_arg(va, double);
|
|
doafloat:
|
|
// do kilos
|
|
if (fl & STBSP__METRIC_SUFFIX) {
|
|
double divisor;
|
|
divisor = 1000.0f;
|
|
if (fl & STBSP__METRIC_1024)
|
|
divisor = 1024.0;
|
|
while (fl < 0x4000000) {
|
|
if ((fv < divisor) && (fv > -divisor))
|
|
break;
|
|
fv /= divisor;
|
|
fl += 0x1000000;
|
|
}
|
|
}
|
|
if (pr == -1)
|
|
pr = 6; // default is 6
|
|
// read the double into a string
|
|
if (stbsp__real_to_str(&sn, &l, num, &dp, fv, pr))
|
|
fl |= STBSP__NEGATIVE;
|
|
dofloatfromg:
|
|
tail[0] = 0;
|
|
stbsp__lead_sign(fl, lead);
|
|
if (dp == STBSP__SPECIAL) {
|
|
s = (char *)sn;
|
|
cs = 0;
|
|
pr = 0;
|
|
goto scopy;
|
|
}
|
|
s = num + 64;
|
|
|
|
// handle the three decimal varieties
|
|
if (dp <= 0) {
|
|
stbsp__int32 i;
|
|
// handle 0.000*000xxxx
|
|
*s++ = '0';
|
|
if (pr)
|
|
*s++ = stbsp__period;
|
|
n = -dp;
|
|
if ((stbsp__int32)n > pr)
|
|
n = pr;
|
|
i = n;
|
|
while (i) {
|
|
if ((((stbsp__uintptr)s) & 3) == 0)
|
|
break;
|
|
*s++ = '0';
|
|
--i;
|
|
}
|
|
while (i >= 4) {
|
|
*(stbsp__uint32 *)s = 0x30303030;
|
|
s += 4;
|
|
i -= 4;
|
|
}
|
|
while (i) {
|
|
*s++ = '0';
|
|
--i;
|
|
}
|
|
if ((stbsp__int32)(l + n) > pr)
|
|
l = pr - n;
|
|
i = l;
|
|
while (i) {
|
|
*s++ = *sn++;
|
|
--i;
|
|
}
|
|
tz = pr - (n + l);
|
|
cs = 1 + (3 << 24); // how many tens did we write (for commas below)
|
|
} else {
|
|
cs = (fl & STBSP__TRIPLET_COMMA) ? ((600 - (stbsp__uint32)dp) % 3) : 0;
|
|
if ((stbsp__uint32)dp >= l) {
|
|
// handle xxxx000*000.0
|
|
n = 0;
|
|
for (;;) {
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (++cs == 4)) {
|
|
cs = 0;
|
|
*s++ = stbsp__comma;
|
|
} else {
|
|
*s++ = sn[n];
|
|
++n;
|
|
if (n >= l)
|
|
break;
|
|
}
|
|
}
|
|
if (n < (stbsp__uint32)dp) {
|
|
n = dp - n;
|
|
if ((fl & STBSP__TRIPLET_COMMA) == 0) {
|
|
while (n) {
|
|
if ((((stbsp__uintptr)s) & 3) == 0)
|
|
break;
|
|
*s++ = '0';
|
|
--n;
|
|
}
|
|
while (n >= 4) {
|
|
*(stbsp__uint32 *)s = 0x30303030;
|
|
s += 4;
|
|
n -= 4;
|
|
}
|
|
}
|
|
while (n) {
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (++cs == 4)) {
|
|
cs = 0;
|
|
*s++ = stbsp__comma;
|
|
} else {
|
|
*s++ = '0';
|
|
--n;
|
|
}
|
|
}
|
|
}
|
|
cs = (int)(s - (num + 64)) + (3 << 24); // cs is how many tens
|
|
if (pr) {
|
|
*s++ = stbsp__period;
|
|
tz = pr;
|
|
}
|
|
} else {
|
|
// handle xxxxx.xxxx000*000
|
|
n = 0;
|
|
for (;;) {
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (++cs == 4)) {
|
|
cs = 0;
|
|
*s++ = stbsp__comma;
|
|
} else {
|
|
*s++ = sn[n];
|
|
++n;
|
|
if (n >= (stbsp__uint32)dp)
|
|
break;
|
|
}
|
|
}
|
|
cs = (int)(s - (num + 64)) + (3 << 24); // cs is how many tens
|
|
if (pr)
|
|
*s++ = stbsp__period;
|
|
if ((l - dp) > (stbsp__uint32)pr)
|
|
l = pr + dp;
|
|
while (n < l) {
|
|
*s++ = sn[n];
|
|
++n;
|
|
}
|
|
tz = pr - (l - dp);
|
|
}
|
|
}
|
|
pr = 0;
|
|
|
|
// handle k,m,g,t
|
|
if (fl & STBSP__METRIC_SUFFIX) {
|
|
char idx;
|
|
idx = 1;
|
|
if (fl & STBSP__METRIC_NOSPACE)
|
|
idx = 0;
|
|
tail[0] = idx;
|
|
tail[1] = ' ';
|
|
{
|
|
if (fl >> 24) { // SI kilo is 'k', JEDEC and SI kibits are 'K'.
|
|
if (fl & STBSP__METRIC_1024)
|
|
tail[idx + 1] = "_KMGT"[fl >> 24];
|
|
else
|
|
tail[idx + 1] = "_kMGT"[fl >> 24];
|
|
idx++;
|
|
// If printing kibits and not in jedec, add the 'i'.
|
|
if (fl & STBSP__METRIC_1024 && !(fl & STBSP__METRIC_JEDEC)) {
|
|
tail[idx + 1] = 'i';
|
|
idx++;
|
|
}
|
|
tail[0] = idx;
|
|
}
|
|
}
|
|
};
|
|
|
|
flt_lead:
|
|
// get the length that we copied
|
|
l = (stbsp__uint32)(s - (num + 64));
|
|
s = num + 64;
|
|
goto scopy;
|
|
#endif
|
|
|
|
case 'B': // upper binary
|
|
case 'b': // lower binary
|
|
h = (f[0] == 'B') ? hexu : hex;
|
|
lead[0] = 0;
|
|
if (fl & STBSP__LEADING_0X) {
|
|
lead[0] = 2;
|
|
lead[1] = '0';
|
|
lead[2] = h[0xb];
|
|
}
|
|
l = (8 << 4) | (1 << 8);
|
|
goto radixnum;
|
|
|
|
case 'o': // octal
|
|
h = hexu;
|
|
lead[0] = 0;
|
|
if (fl & STBSP__LEADING_0X) {
|
|
lead[0] = 1;
|
|
lead[1] = '0';
|
|
}
|
|
l = (3 << 4) | (3 << 8);
|
|
goto radixnum;
|
|
|
|
case 'p': // pointer
|
|
fl |= (sizeof(void *) == 8) ? STBSP__INTMAX : 0;
|
|
pr = sizeof(void *) * 2;
|
|
fl &= ~STBSP__LEADINGZERO; // 'p' only prints the pointer with zeros
|
|
// fall through - to X
|
|
|
|
case 'X': // upper hex
|
|
case 'x': // lower hex
|
|
h = (f[0] == 'X') ? hexu : hex;
|
|
l = (4 << 4) | (4 << 8);
|
|
lead[0] = 0;
|
|
if (fl & STBSP__LEADING_0X) {
|
|
lead[0] = 2;
|
|
lead[1] = '0';
|
|
lead[2] = h[16];
|
|
}
|
|
radixnum:
|
|
// get the number
|
|
if (fl & STBSP__INTMAX)
|
|
n64 = va_arg(va, stbsp__uint64);
|
|
else
|
|
n64 = va_arg(va, stbsp__uint32);
|
|
|
|
s = num + STBSP__NUMSZ;
|
|
dp = 0;
|
|
// clear tail, and clear leading if value is zero
|
|
tail[0] = 0;
|
|
if (n64 == 0) {
|
|
lead[0] = 0;
|
|
if (pr == 0) {
|
|
l = 0;
|
|
cs = (((l >> 4) & 15)) << 24;
|
|
goto scopy;
|
|
}
|
|
}
|
|
// convert to string
|
|
for (;;) {
|
|
*--s = h[n64 & ((1 << (l >> 8)) - 1)];
|
|
n64 >>= (l >> 8);
|
|
if (!((n64) || ((stbsp__int32)((num + STBSP__NUMSZ) - s) < pr)))
|
|
break;
|
|
if (fl & STBSP__TRIPLET_COMMA) {
|
|
++l;
|
|
if ((l & 15) == ((l >> 4) & 15)) {
|
|
l &= ~15;
|
|
*--s = stbsp__comma;
|
|
}
|
|
}
|
|
};
|
|
// get the tens and the comma pos
|
|
cs = (stbsp__uint32)((num + STBSP__NUMSZ) - s) + ((((l >> 4) & 15)) << 24);
|
|
// get the length that we copied
|
|
l = (stbsp__uint32)((num + STBSP__NUMSZ) - s);
|
|
// copy it
|
|
goto scopy;
|
|
|
|
case 'u': // unsigned
|
|
case 'i':
|
|
case 'd': // integer
|
|
// get the integer and abs it
|
|
if (fl & STBSP__INTMAX) {
|
|
stbsp__int64 i64 = va_arg(va, stbsp__int64);
|
|
n64 = (stbsp__uint64)i64;
|
|
if ((f[0] != 'u') && (i64 < 0)) {
|
|
n64 = (stbsp__uint64)-i64;
|
|
fl |= STBSP__NEGATIVE;
|
|
}
|
|
} else {
|
|
stbsp__int32 i = va_arg(va, stbsp__int32);
|
|
n64 = (stbsp__uint32)i;
|
|
if ((f[0] != 'u') && (i < 0)) {
|
|
n64 = (stbsp__uint32)-i;
|
|
fl |= STBSP__NEGATIVE;
|
|
}
|
|
}
|
|
|
|
#ifndef STB_SPRINTF_NOFLOAT
|
|
if (fl & STBSP__METRIC_SUFFIX) {
|
|
if (n64 < 1024)
|
|
pr = 0;
|
|
else if (pr == -1)
|
|
pr = 1;
|
|
fv = (double)(stbsp__int64)n64;
|
|
goto doafloat;
|
|
}
|
|
#endif
|
|
|
|
// convert to string
|
|
s = num + STBSP__NUMSZ;
|
|
l = 0;
|
|
|
|
for (;;) {
|
|
// do in 32-bit chunks (avoid lots of 64-bit divides even with constant denominators)
|
|
char *o = s - 8;
|
|
if (n64 >= 100000000) {
|
|
n = (stbsp__uint32)(n64 % 100000000);
|
|
n64 /= 100000000;
|
|
} else {
|
|
n = (stbsp__uint32)n64;
|
|
n64 = 0;
|
|
}
|
|
if ((fl & STBSP__TRIPLET_COMMA) == 0) {
|
|
do {
|
|
s -= 2;
|
|
*(stbsp__uint16 *)s = *(stbsp__uint16 *)&stbsp__digitpair.pair[(n % 100) * 2];
|
|
n /= 100;
|
|
} while (n);
|
|
}
|
|
while (n) {
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (l++ == 3)) {
|
|
l = 0;
|
|
*--s = stbsp__comma;
|
|
--o;
|
|
} else {
|
|
*--s = (char)(n % 10) + '0';
|
|
n /= 10;
|
|
}
|
|
}
|
|
if (n64 == 0) {
|
|
if ((s[0] == '0') && (s != (num + STBSP__NUMSZ)))
|
|
++s;
|
|
break;
|
|
}
|
|
while (s != o)
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (l++ == 3)) {
|
|
l = 0;
|
|
*--s = stbsp__comma;
|
|
--o;
|
|
} else {
|
|
*--s = '0';
|
|
}
|
|
}
|
|
|
|
tail[0] = 0;
|
|
stbsp__lead_sign(fl, lead);
|
|
|
|
// get the length that we copied
|
|
l = (stbsp__uint32)((num + STBSP__NUMSZ) - s);
|
|
if (l == 0) {
|
|
*--s = '0';
|
|
l = 1;
|
|
}
|
|
cs = l + (3 << 24);
|
|
if (pr < 0)
|
|
pr = 0;
|
|
|
|
scopy:
|
|
// get fw=leading/trailing space, pr=leading zeros
|
|
if (pr < (stbsp__int32)l)
|
|
pr = l;
|
|
n = pr + lead[0] + tail[0] + tz;
|
|
if (fw < (stbsp__int32)n)
|
|
fw = n;
|
|
fw -= n;
|
|
pr -= l;
|
|
|
|
// handle right justify and leading zeros
|
|
if ((fl & STBSP__LEFTJUST) == 0) {
|
|
if (fl & STBSP__LEADINGZERO) // if leading zeros, everything is in pr
|
|
{
|
|
pr = (fw > pr) ? fw : pr;
|
|
fw = 0;
|
|
} else {
|
|
fl &= ~STBSP__TRIPLET_COMMA; // if no leading zeros, then no commas
|
|
}
|
|
}
|
|
|
|
// copy the spaces and/or zeros
|
|
if (fw + pr) {
|
|
stbsp__int32 i;
|
|
stbsp__uint32 c;
|
|
|
|
// copy leading spaces (or when doing %8.4d stuff)
|
|
if ((fl & STBSP__LEFTJUST) == 0)
|
|
while (fw > 0) {
|
|
stbsp__cb_buf_clamp(i, fw);
|
|
fw -= i;
|
|
while (i) {
|
|
if ((((stbsp__uintptr)bf) & 3) == 0)
|
|
break;
|
|
*bf++ = ' ';
|
|
--i;
|
|
}
|
|
while (i >= 4) {
|
|
*(stbsp__uint32 *)bf = 0x20202020;
|
|
bf += 4;
|
|
i -= 4;
|
|
}
|
|
while (i) {
|
|
*bf++ = ' ';
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// copy leader
|
|
sn = lead + 1;
|
|
while (lead[0]) {
|
|
stbsp__cb_buf_clamp(i, lead[0]);
|
|
lead[0] -= (char)i;
|
|
while (i) {
|
|
*bf++ = *sn++;
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// copy leading zeros
|
|
c = cs >> 24;
|
|
cs &= 0xffffff;
|
|
cs = (fl & STBSP__TRIPLET_COMMA) ? ((stbsp__uint32)(c - ((pr + cs) % (c + 1)))) : 0;
|
|
while (pr > 0) {
|
|
stbsp__cb_buf_clamp(i, pr);
|
|
pr -= i;
|
|
if ((fl & STBSP__TRIPLET_COMMA) == 0) {
|
|
while (i) {
|
|
if ((((stbsp__uintptr)bf) & 3) == 0)
|
|
break;
|
|
*bf++ = '0';
|
|
--i;
|
|
}
|
|
while (i >= 4) {
|
|
*(stbsp__uint32 *)bf = 0x30303030;
|
|
bf += 4;
|
|
i -= 4;
|
|
}
|
|
}
|
|
while (i) {
|
|
if ((fl & STBSP__TRIPLET_COMMA) && (cs++ == c)) {
|
|
cs = 0;
|
|
*bf++ = stbsp__comma;
|
|
} else
|
|
*bf++ = '0';
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
}
|
|
|
|
// copy leader if there is still one
|
|
sn = lead + 1;
|
|
while (lead[0]) {
|
|
stbsp__int32 i;
|
|
stbsp__cb_buf_clamp(i, lead[0]);
|
|
lead[0] -= (char)i;
|
|
while (i) {
|
|
*bf++ = *sn++;
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// copy the string
|
|
n = l;
|
|
while (n) {
|
|
stbsp__int32 i;
|
|
stbsp__cb_buf_clamp(i, n);
|
|
n -= i;
|
|
STBSP__UNALIGNED(while (i >= 4) {
|
|
*(stbsp__uint32 *)bf = *(stbsp__uint32 *)s;
|
|
bf += 4;
|
|
s += 4;
|
|
i -= 4;
|
|
})
|
|
while (i) {
|
|
*bf++ = *s++;
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// copy trailing zeros
|
|
while (tz) {
|
|
stbsp__int32 i;
|
|
stbsp__cb_buf_clamp(i, tz);
|
|
tz -= i;
|
|
while (i) {
|
|
if ((((stbsp__uintptr)bf) & 3) == 0)
|
|
break;
|
|
*bf++ = '0';
|
|
--i;
|
|
}
|
|
while (i >= 4) {
|
|
*(stbsp__uint32 *)bf = 0x30303030;
|
|
bf += 4;
|
|
i -= 4;
|
|
}
|
|
while (i) {
|
|
*bf++ = '0';
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// copy tail if there is one
|
|
sn = tail + 1;
|
|
while (tail[0]) {
|
|
stbsp__int32 i;
|
|
stbsp__cb_buf_clamp(i, tail[0]);
|
|
tail[0] -= (char)i;
|
|
while (i) {
|
|
*bf++ = *sn++;
|
|
--i;
|
|
}
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
|
|
// handle the left justify
|
|
if (fl & STBSP__LEFTJUST)
|
|
if (fw > 0) {
|
|
while (fw) {
|
|
stbsp__int32 i;
|
|
stbsp__cb_buf_clamp(i, fw);
|
|
fw -= i;
|
|
while (i) {
|
|
if ((((stbsp__uintptr)bf) & 3) == 0)
|
|
break;
|
|
*bf++ = ' ';
|
|
--i;
|
|
}
|
|
while (i >= 4) {
|
|
*(stbsp__uint32 *)bf = 0x20202020;
|
|
bf += 4;
|
|
i -= 4;
|
|
}
|
|
while (i--)
|
|
*bf++ = ' ';
|
|
stbsp__chk_cb_buf(1);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default: // unknown, just copy code
|
|
s = num + STBSP__NUMSZ - 1;
|
|
*s = f[0];
|
|
l = 1;
|
|
fw = fl = 0;
|
|
lead[0] = 0;
|
|
tail[0] = 0;
|
|
pr = 0;
|
|
dp = 0;
|
|
cs = 0;
|
|
goto scopy;
|
|
}
|
|
++f;
|
|
}
|
|
endfmt:
|
|
|
|
if (!callback)
|
|
*bf = 0;
|
|
else
|
|
stbsp__flush_cb();
|
|
|
|
done:
|
|
return tlen + (int)(bf - buf);
|
|
}
|
|
|
|
// cleanup
|
|
#undef STBSP__LEFTJUST
|
|
#undef STBSP__LEADINGPLUS
|
|
#undef STBSP__LEADINGSPACE
|
|
#undef STBSP__LEADING_0X
|
|
#undef STBSP__LEADINGZERO
|
|
#undef STBSP__INTMAX
|
|
#undef STBSP__TRIPLET_COMMA
|
|
#undef STBSP__NEGATIVE
|
|
#undef STBSP__METRIC_SUFFIX
|
|
#undef STBSP__NUMSZ
|
|
#undef stbsp__chk_cb_bufL
|
|
#undef stbsp__chk_cb_buf
|
|
#undef stbsp__flush_cb
|
|
#undef stbsp__cb_buf_clamp
|
|
|
|
// ============================================================================
|
|
// wrapper functions
|
|
|
|
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(sprintf)(char *buf, char const *fmt, ...)
|
|
{
|
|
int result;
|
|
va_list va;
|
|
va_start(va, fmt);
|
|
result = STB_SPRINTF_DECORATE(vsprintfcb)(0, 0, buf, fmt, va);
|
|
va_end(va);
|
|
return result;
|
|
}
|
|
|
|
typedef struct stbsp__context {
|
|
char *buf;
|
|
int count;
|
|
int length;
|
|
char tmp[STB_SPRINTF_MIN];
|
|
} stbsp__context;
|
|
|
|
static char *stbsp__clamp_callback(char *buf, void *user, int len)
|
|
{
|
|
stbsp__context *c = (stbsp__context *)user;
|
|
c->length += len;
|
|
|
|
if (len > c->count)
|
|
len = c->count;
|
|
|
|
if (len) {
|
|
if (buf != c->buf) {
|
|
char *s, *d, *se;
|
|
d = c->buf;
|
|
s = buf;
|
|
se = buf + len;
|
|
do {
|
|
*d++ = *s++;
|
|
} while (s < se);
|
|
}
|
|
c->buf += len;
|
|
c->count -= len;
|
|
}
|
|
|
|
if (c->count <= 0)
|
|
return c->tmp;
|
|
return (c->count >= STB_SPRINTF_MIN) ? c->buf : c->tmp; // go direct into buffer if you can
|
|
}
|
|
|
|
static char * stbsp__count_clamp_callback( char * buf, void * user, int len )
|
|
{
|
|
stbsp__context * c = (stbsp__context*)user;
|
|
|
|
c->length += len;
|
|
return c->tmp; // go direct into buffer if you can
|
|
}
|
|
|
|
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsnprintf )( char * buf, int count, char const * fmt, va_list va )
|
|
{
|
|
stbsp__context c;
|
|
|
|
if ( (count == 0) && !buf )
|
|
{
|
|
c.length = 0;
|
|
|
|
STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__count_clamp_callback, &c, c.tmp, fmt, va );
|
|
}
|
|
else
|
|
{
|
|
int l;
|
|
|
|
c.buf = buf;
|
|
c.count = count;
|
|
c.length = 0;
|
|
|
|
STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__clamp_callback, &c, stbsp__clamp_callback(0,&c,0), fmt, va );
|
|
|
|
// zero-terminate
|
|
l = (int)( c.buf - buf );
|
|
if ( l >= count ) // should never be greater, only equal (or less) than count
|
|
l = count - 1;
|
|
buf[l] = 0;
|
|
}
|
|
|
|
return c.length;
|
|
}
|
|
|
|
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(snprintf)(char *buf, int count, char const *fmt, ...)
|
|
{
|
|
int result;
|
|
va_list va;
|
|
va_start(va, fmt);
|
|
|
|
result = STB_SPRINTF_DECORATE(vsnprintf)(buf, count, fmt, va);
|
|
va_end(va);
|
|
|
|
return result;
|
|
}
|
|
|
|
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintf)(char *buf, char const *fmt, va_list va)
|
|
{
|
|
return STB_SPRINTF_DECORATE(vsprintfcb)(0, 0, buf, fmt, va);
|
|
}
|
|
|
|
// =======================================================================
|
|
// low level float utility functions
|
|
|
|
#ifndef STB_SPRINTF_NOFLOAT
|
|
|
|
// copies d to bits w/ strict aliasing (this compiles to nothing on /Ox)
|
|
#define STBSP__COPYFP(dest, src) \
|
|
{ \
|
|
int cn; \
|
|
for (cn = 0; cn < 8; cn++) \
|
|
((char *)&dest)[cn] = ((char *)&src)[cn]; \
|
|
}
|
|
|
|
// get float info
|
|
static stbsp__int32 stbsp__real_to_parts(stbsp__int64 *bits, stbsp__int32 *expo, double value)
|
|
{
|
|
double d;
|
|
stbsp__int64 b = 0;
|
|
|
|
// load value and round at the frac_digits
|
|
d = value;
|
|
|
|
STBSP__COPYFP(b, d);
|
|
|
|
*bits = b & ((((stbsp__uint64)1) << 52) - 1);
|
|
*expo = (stbsp__int32)(((b >> 52) & 2047) - 1023);
|
|
|
|
return (stbsp__int32)((stbsp__uint64) b >> 63);
|
|
}
|
|
|
|
static double const stbsp__bot[23] = {
|
|
1e+000, 1e+001, 1e+002, 1e+003, 1e+004, 1e+005, 1e+006, 1e+007, 1e+008, 1e+009, 1e+010, 1e+011,
|
|
1e+012, 1e+013, 1e+014, 1e+015, 1e+016, 1e+017, 1e+018, 1e+019, 1e+020, 1e+021, 1e+022
|
|
};
|
|
static double const stbsp__negbot[22] = {
|
|
1e-001, 1e-002, 1e-003, 1e-004, 1e-005, 1e-006, 1e-007, 1e-008, 1e-009, 1e-010, 1e-011,
|
|
1e-012, 1e-013, 1e-014, 1e-015, 1e-016, 1e-017, 1e-018, 1e-019, 1e-020, 1e-021, 1e-022
|
|
};
|
|
static double const stbsp__negboterr[22] = {
|
|
-5.551115123125783e-018, -2.0816681711721684e-019, -2.0816681711721686e-020, -4.7921736023859299e-021, -8.1803053914031305e-022, 4.5251888174113741e-023,
|
|
4.5251888174113739e-024, -2.0922560830128471e-025, -6.2281591457779853e-026, -3.6432197315497743e-027, 6.0503030718060191e-028, 2.0113352370744385e-029,
|
|
-3.0373745563400371e-030, 1.1806906454401013e-032, -7.7705399876661076e-032, 2.0902213275965398e-033, -7.1542424054621921e-034, -7.1542424054621926e-035,
|
|
2.4754073164739869e-036, 5.4846728545790429e-037, 9.2462547772103625e-038, -4.8596774326570872e-039
|
|
};
|
|
static double const stbsp__top[13] = {
|
|
1e+023, 1e+046, 1e+069, 1e+092, 1e+115, 1e+138, 1e+161, 1e+184, 1e+207, 1e+230, 1e+253, 1e+276, 1e+299
|
|
};
|
|
static double const stbsp__negtop[13] = {
|
|
1e-023, 1e-046, 1e-069, 1e-092, 1e-115, 1e-138, 1e-161, 1e-184, 1e-207, 1e-230, 1e-253, 1e-276, 1e-299
|
|
};
|
|
static double const stbsp__toperr[13] = {
|
|
8388608,
|
|
6.8601809640529717e+028,
|
|
-7.253143638152921e+052,
|
|
-4.3377296974619174e+075,
|
|
-1.5559416129466825e+098,
|
|
-3.2841562489204913e+121,
|
|
-3.7745893248228135e+144,
|
|
-1.7356668416969134e+167,
|
|
-3.8893577551088374e+190,
|
|
-9.9566444326005119e+213,
|
|
6.3641293062232429e+236,
|
|
-5.2069140800249813e+259,
|
|
-5.2504760255204387e+282
|
|
};
|
|
static double const stbsp__negtoperr[13] = {
|
|
3.9565301985100693e-040, -2.299904345391321e-063, 3.6506201437945798e-086, 1.1875228833981544e-109,
|
|
-5.0644902316928607e-132, -6.7156837247865426e-155, -2.812077463003139e-178, -5.7778912386589953e-201,
|
|
7.4997100559334532e-224, -4.6439668915134491e-247, -6.3691100762962136e-270, -9.436808465446358e-293,
|
|
8.0970921678014997e-317
|
|
};
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER <= 1200)
|
|
static stbsp__uint64 const stbsp__powten[20] = {
|
|
1,
|
|
10,
|
|
100,
|
|
1000,
|
|
10000,
|
|
100000,
|
|
1000000,
|
|
10000000,
|
|
100000000,
|
|
1000000000,
|
|
10000000000,
|
|
100000000000,
|
|
1000000000000,
|
|
10000000000000,
|
|
100000000000000,
|
|
1000000000000000,
|
|
10000000000000000,
|
|
100000000000000000,
|
|
1000000000000000000,
|
|
10000000000000000000U
|
|
};
|
|
#define stbsp__tento19th ((stbsp__uint64)1000000000000000000)
|
|
#else
|
|
static stbsp__uint64 const stbsp__powten[20] = {
|
|
1,
|
|
10,
|
|
100,
|
|
1000,
|
|
10000,
|
|
100000,
|
|
1000000,
|
|
10000000,
|
|
100000000,
|
|
1000000000,
|
|
10000000000ULL,
|
|
100000000000ULL,
|
|
1000000000000ULL,
|
|
10000000000000ULL,
|
|
100000000000000ULL,
|
|
1000000000000000ULL,
|
|
10000000000000000ULL,
|
|
100000000000000000ULL,
|
|
1000000000000000000ULL,
|
|
10000000000000000000ULL
|
|
};
|
|
#define stbsp__tento19th (1000000000000000000ULL)
|
|
#endif
|
|
|
|
#define stbsp__ddmulthi(oh, ol, xh, yh) \
|
|
{ \
|
|
double ahi = 0, alo, bhi = 0, blo; \
|
|
stbsp__int64 bt; \
|
|
oh = xh * yh; \
|
|
STBSP__COPYFP(bt, xh); \
|
|
bt &= ((~(stbsp__uint64)0) << 27); \
|
|
STBSP__COPYFP(ahi, bt); \
|
|
alo = xh - ahi; \
|
|
STBSP__COPYFP(bt, yh); \
|
|
bt &= ((~(stbsp__uint64)0) << 27); \
|
|
STBSP__COPYFP(bhi, bt); \
|
|
blo = yh - bhi; \
|
|
ol = ((ahi * bhi - oh) + ahi * blo + alo * bhi) + alo * blo; \
|
|
}
|
|
|
|
#define stbsp__ddtoS64(ob, xh, xl) \
|
|
{ \
|
|
double ahi = 0, alo, vh, t; \
|
|
ob = (stbsp__int64)ph; \
|
|
vh = (double)ob; \
|
|
ahi = (xh - vh); \
|
|
t = (ahi - xh); \
|
|
alo = (xh - (ahi - t)) - (vh + t); \
|
|
ob += (stbsp__int64)(ahi + alo + xl); \
|
|
}
|
|
|
|
#define stbsp__ddrenorm(oh, ol) \
|
|
{ \
|
|
double s; \
|
|
s = oh + ol; \
|
|
ol = ol - (s - oh); \
|
|
oh = s; \
|
|
}
|
|
|
|
#define stbsp__ddmultlo(oh, ol, xh, xl, yh, yl) ol = ol + (xh * yl + xl * yh);
|
|
|
|
#define stbsp__ddmultlos(oh, ol, xh, yl) ol = ol + (xh * yl);
|
|
|
|
static void stbsp__raise_to_power10(double *ohi, double *olo, double d, stbsp__int32 power) // power can be -323 to +350
|
|
{
|
|
double ph, pl;
|
|
if ((power >= 0) && (power <= 22)) {
|
|
stbsp__ddmulthi(ph, pl, d, stbsp__bot[power]);
|
|
} else {
|
|
stbsp__int32 e, et, eb;
|
|
double p2h, p2l;
|
|
|
|
e = power;
|
|
if (power < 0)
|
|
e = -e;
|
|
et = (e * 0x2c9) >> 14; /* %23 */
|
|
if (et > 13)
|
|
et = 13;
|
|
eb = e - (et * 23);
|
|
|
|
ph = d;
|
|
pl = 0.0;
|
|
if (power < 0) {
|
|
if (eb) {
|
|
--eb;
|
|
stbsp__ddmulthi(ph, pl, d, stbsp__negbot[eb]);
|
|
stbsp__ddmultlos(ph, pl, d, stbsp__negboterr[eb]);
|
|
}
|
|
if (et) {
|
|
stbsp__ddrenorm(ph, pl);
|
|
--et;
|
|
stbsp__ddmulthi(p2h, p2l, ph, stbsp__negtop[et]);
|
|
stbsp__ddmultlo(p2h, p2l, ph, pl, stbsp__negtop[et], stbsp__negtoperr[et]);
|
|
ph = p2h;
|
|
pl = p2l;
|
|
}
|
|
} else {
|
|
if (eb) {
|
|
e = eb;
|
|
if (eb > 22)
|
|
eb = 22;
|
|
e -= eb;
|
|
stbsp__ddmulthi(ph, pl, d, stbsp__bot[eb]);
|
|
if (e) {
|
|
stbsp__ddrenorm(ph, pl);
|
|
stbsp__ddmulthi(p2h, p2l, ph, stbsp__bot[e]);
|
|
stbsp__ddmultlos(p2h, p2l, stbsp__bot[e], pl);
|
|
ph = p2h;
|
|
pl = p2l;
|
|
}
|
|
}
|
|
if (et) {
|
|
stbsp__ddrenorm(ph, pl);
|
|
--et;
|
|
stbsp__ddmulthi(p2h, p2l, ph, stbsp__top[et]);
|
|
stbsp__ddmultlo(p2h, p2l, ph, pl, stbsp__top[et], stbsp__toperr[et]);
|
|
ph = p2h;
|
|
pl = p2l;
|
|
}
|
|
}
|
|
}
|
|
stbsp__ddrenorm(ph, pl);
|
|
*ohi = ph;
|
|
*olo = pl;
|
|
}
|
|
|
|
// given a float value, returns the significant bits in bits, and the position of the
|
|
// decimal point in decimal_pos. +/-INF and NAN are specified by special values
|
|
// returned in the decimal_pos parameter.
|
|
// frac_digits is absolute normally, but if you want from first significant digits (got %g and %e), or in 0x80000000
|
|
static stbsp__int32 stbsp__real_to_str(char const **start, stbsp__uint32 *len, char *out, stbsp__int32 *decimal_pos, double value, stbsp__uint32 frac_digits)
|
|
{
|
|
double d;
|
|
stbsp__int64 bits = 0;
|
|
stbsp__int32 expo, e, ng, tens;
|
|
|
|
d = value;
|
|
STBSP__COPYFP(bits, d);
|
|
expo = (stbsp__int32)((bits >> 52) & 2047);
|
|
ng = (stbsp__int32)((stbsp__uint64) bits >> 63);
|
|
if (ng)
|
|
d = -d;
|
|
|
|
if (expo == 2047) // is nan or inf?
|
|
{
|
|
*start = (bits & ((((stbsp__uint64)1) << 52) - 1)) ? "NaN" : "Inf";
|
|
*decimal_pos = STBSP__SPECIAL;
|
|
*len = 3;
|
|
return ng;
|
|
}
|
|
|
|
if (expo == 0) // is zero or denormal
|
|
{
|
|
if ((bits << 1) == 0) // do zero
|
|
{
|
|
*decimal_pos = 1;
|
|
*start = out;
|
|
out[0] = '0';
|
|
*len = 1;
|
|
return ng;
|
|
}
|
|
// find the right expo for denormals
|
|
{
|
|
stbsp__int64 v = ((stbsp__uint64)1) << 51;
|
|
while ((bits & v) == 0) {
|
|
--expo;
|
|
v >>= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// find the decimal exponent as well as the decimal bits of the value
|
|
{
|
|
double ph, pl;
|
|
|
|
// log10 estimate - very specifically tweaked to hit or undershoot by no more than 1 of log10 of all expos 1..2046
|
|
tens = expo - 1023;
|
|
tens = (tens < 0) ? ((tens * 617) / 2048) : (((tens * 1233) / 4096) + 1);
|
|
|
|
// move the significant bits into position and stick them into an int
|
|
stbsp__raise_to_power10(&ph, &pl, d, 18 - tens);
|
|
|
|
// get full as much precision from double-double as possible
|
|
stbsp__ddtoS64(bits, ph, pl);
|
|
|
|
// check if we undershot
|
|
if (((stbsp__uint64)bits) >= stbsp__tento19th)
|
|
++tens;
|
|
}
|
|
|
|
// now do the rounding in integer land
|
|
frac_digits = (frac_digits & 0x80000000) ? ((frac_digits & 0x7ffffff) + 1) : (tens + frac_digits);
|
|
if ((frac_digits < 24)) {
|
|
stbsp__uint32 dg = 1;
|
|
if ((stbsp__uint64)bits >= stbsp__powten[9])
|
|
dg = 10;
|
|
while ((stbsp__uint64)bits >= stbsp__powten[dg]) {
|
|
++dg;
|
|
if (dg == 20)
|
|
goto noround;
|
|
}
|
|
if (frac_digits < dg) {
|
|
stbsp__uint64 r;
|
|
// add 0.5 at the right position and round
|
|
e = dg - frac_digits;
|
|
if ((stbsp__uint32)e >= 24)
|
|
goto noround;
|
|
r = stbsp__powten[e];
|
|
bits = bits + (r / 2);
|
|
if ((stbsp__uint64)bits >= stbsp__powten[dg])
|
|
++tens;
|
|
bits /= r;
|
|
}
|
|
noround:;
|
|
}
|
|
|
|
// kill long trailing runs of zeros
|
|
if (bits) {
|
|
stbsp__uint32 n;
|
|
for (;;) {
|
|
if (bits <= 0xffffffff)
|
|
break;
|
|
if (bits % 1000)
|
|
goto donez;
|
|
bits /= 1000;
|
|
}
|
|
n = (stbsp__uint32)bits;
|
|
while ((n % 1000) == 0)
|
|
n /= 1000;
|
|
bits = n;
|
|
donez:;
|
|
}
|
|
|
|
// convert to string
|
|
out += 64;
|
|
e = 0;
|
|
for (;;) {
|
|
stbsp__uint32 n;
|
|
char *o = out - 8;
|
|
// do the conversion in chunks of U32s (avoid most 64-bit divides, worth it, constant denomiators be damned)
|
|
if (bits >= 100000000) {
|
|
n = (stbsp__uint32)(bits % 100000000);
|
|
bits /= 100000000;
|
|
} else {
|
|
n = (stbsp__uint32)bits;
|
|
bits = 0;
|
|
}
|
|
while (n) {
|
|
out -= 2;
|
|
*(stbsp__uint16 *)out = *(stbsp__uint16 *)&stbsp__digitpair.pair[(n % 100) * 2];
|
|
n /= 100;
|
|
e += 2;
|
|
}
|
|
if (bits == 0) {
|
|
if ((e) && (out[0] == '0')) {
|
|
++out;
|
|
--e;
|
|
}
|
|
break;
|
|
}
|
|
while (out != o) {
|
|
*--out = '0';
|
|
++e;
|
|
}
|
|
}
|
|
|
|
*decimal_pos = tens;
|
|
*start = out;
|
|
*len = e;
|
|
return ng;
|
|
}
|
|
|
|
#undef stbsp__ddmulthi
|
|
#undef stbsp__ddrenorm
|
|
#undef stbsp__ddmultlo
|
|
#undef stbsp__ddmultlos
|
|
#undef STBSP__SPECIAL
|
|
#undef STBSP__COPYFP
|
|
|
|
#endif // STB_SPRINTF_NOFLOAT
|
|
|
|
// clean up
|
|
#undef stbsp__uint16
|
|
#undef stbsp__uint32
|
|
#undef stbsp__int32
|
|
#undef stbsp__uint64
|
|
#undef stbsp__int64
|
|
#undef STBSP__UNALIGNED
|
|
|
|
#endif // STB_SPRINTF_IMPLEMENTATION
|
|
|
|
/*
|
|
------------------------------------------------------------------------------
|
|
This software is available under 2 licenses -- choose whichever you prefer.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE A - MIT License
|
|
Copyright (c) 2017 Sean Barrett
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE B - Public Domain (www.unlicense.org)
|
|
This is free and unencumbered software released into the public domain.
|
|
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
|
|
software, either in source code form or as a compiled binary, for any purpose,
|
|
commercial or non-commercial, and by any means.
|
|
In jurisdictions that recognize copyright laws, the author or authors of this
|
|
software dedicate any and all copyright interest in the software to the public
|
|
domain. We make this dedication for the benefit of the public at large and to
|
|
the detriment of our heirs and successors. We intend this dedication to be an
|
|
overt act of relinquishment in perpetuity of all present and future rights to
|
|
this software under copyright law.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
*/
|