diff options
| author | Manuel Novoa III <mjn3@codepoet.org> | 2001-02-27 21:33:59 +0000 |
|---|---|---|
| committer | Manuel Novoa III <mjn3@codepoet.org> | 2001-02-27 21:33:59 +0000 |
| commit | 82dd793fd07a21d4b03d3e0a1bd7434d302f35bb (patch) | |
| tree | cc4df06c8e33aba7e0c221ef7bec66de123cd2cd /libc/misc/internals/dtostr.c | |
| parent | 8cdb05af7df2bca002024f3553ea69e462d97c24 (diff) | |
stdio mostly rewritten... passes lots of tests now.
printf now supports long double, plus some bug fixes.
Diffstat (limited to 'libc/misc/internals/dtostr.c')
| -rw-r--r-- | libc/misc/internals/dtostr.c | 26 |
1 files changed, 11 insertions, 15 deletions
diff --git a/libc/misc/internals/dtostr.c b/libc/misc/internals/dtostr.c index 498887fb3..85ec69b12 100644 --- a/libc/misc/internals/dtostr.c +++ b/libc/misc/internals/dtostr.c @@ -1,7 +1,7 @@ /* * Copyright (C) 2000, 2001 Manuel Novoa III * - * Function: int __dtostr(FILE * fp, size_t size, double x, + * Function: int __dtostr(FILE * fp, size_t size, long double x, * char flag[], int width, int preci, char mode) * * This was written for uClibc to provide floating point support for @@ -32,17 +32,18 @@ /* * Configuration for the scaling power table. Ignoring denormals, you - * should have 2**EXP_TABLE_SIZE >= MAX_DBL_EXP >= 2**(EXP_TABLE_SIZE-1). + * should have 2**EXP_TABLE_SIZE >= LDBL_MAX_EXP >= 2**(EXP_TABLE_SIZE-1). * The minimum for standard C is 6. For IEEE 8bit doubles, 9 suffices. + * For long doubles on i386, use 13. */ -#define EXP_TABLE_SIZE 9 +#define EXP_TABLE_SIZE 13 /* * Set this to the maximum number of digits you want converted. * Conversion is done in blocks of DIGITS_PER_BLOCK (9 by default) digits. - * 17 digits suffices to uniquely determine a double on i386. + * (20) 17 digits suffices to uniquely determine a (long) double on i386. */ -#define MAX_DIGITS 17 +#define MAX_DIGITS 20 /* * Set this to the smallest integer type capable of storing a pointer. @@ -56,11 +57,7 @@ * caused by the FPU that strtod had. If it causes problems, call the function * and compile zoicheck.c with -ffloat-store. */ -#if 1 #define _zero_or_inf_check(x) ( x == (x/4) ) -#else -extern int _zero_or_inf_check(double x); -#endif /* * Fairly portable nan check. Bitwise for i386 generated larger code. @@ -103,10 +100,9 @@ enum { /* * Only bother checking if this is too small. - * Throw in some play for denormals ( roughly O(-324) vs O(-307) on i386 ). */ -#if (3+DBL_DIG-DBL_MIN_10_EXP)/2 > EXP_TABLE_MAX +#if LDBL_MAX_10_EXP/2 > EXP_TABLE_MAX #error larger EXP_TABLE_SIZE needed #endif @@ -147,11 +143,11 @@ static const char *fmts[] = { /*****************************************************************************/ -int __dtostr(FILE * fp, size_t size, double x, +int __dtostr(FILE * fp, size_t size, long double x, char flag[], int width, int preci, char mode) { - double exp_table[EXP_TABLE_SIZE]; - double p10; + long double exp_table[EXP_TABLE_SIZE]; + long double p10; DIGIT_BLOCK_TYPE digit_block; /* int of at least 32 bits */ int i, j; int round, o_exp; @@ -290,7 +286,7 @@ int __dtostr(FILE * fp, size_t size, double x, } *++e = 0; /* ending nul char */ - if ((mode == 'g') && ((o_exp >= -4) && (o_exp < round))) { + if ((mode == 'g') && ((o_exp >= -4) && (o_exp <= round))) { mode = 'f'; } |