diff options
Diffstat (limited to 'newlib/libc/stdlib/ldtoa.c')
| -rw-r--r-- | newlib/libc/stdlib/ldtoa.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/newlib/libc/stdlib/ldtoa.c b/newlib/libc/stdlib/ldtoa.c index ca8b9f363..0e4476e66 100644 --- a/newlib/libc/stdlib/ldtoa.c +++ b/newlib/libc/stdlib/ldtoa.c @@ -41,6 +41,9 @@ void _IO_ldtostr(long double *, char *, int, int, char); /* The exponent of 1.0 */ #define EXONE (0x3fff) + /* Maximum exponent digits - base 10 */ + #define MAX_EXP_DIGITS 5 + /* Control structure for long doublue conversion including rounding precision values. * rndprc can be set to 80 (if NE=6), 64, 56, 53, or 24 bits. */ @@ -2703,7 +2706,7 @@ _ldtoa_r (struct _reent *ptr, long double d, int mode, int ndigits, int *decpt, { unsigned short e[NI]; char *s, *p; -int k; +int i, j, k; LDPARMS rnd; LDPARMS *ldp = &rnd; char *outstr; @@ -2744,16 +2747,21 @@ if( mode != 3 ) For now, just ask for 20 digits which is enough but sometimes too many. */ if( mode == 0 ) ndigits = 20; + +/* reentrancy addition to use mprec storage pool */ +/* we want to have enough space to hold the formatted result */ +i = ndigits + (mode == 3 ? (MAX_EXP_DIGITS + 1) : 1); +j = sizeof (__ULong); +for (_REENT_MP_RESULT_K(ptr) = 0; sizeof (_Bigint) - sizeof (__ULong) + j <= i; j <<= 1) + _REENT_MP_RESULT_K(ptr)++; +_REENT_MP_RESULT(ptr) = Balloc (ptr, _REENT_MP_RESULT_K(ptr)); +outstr = (char *)_REENT_MP_RESULT(ptr); + /* This sanity limit must agree with the corresponding one in etoasc, to keep straight the returned value of outexpon. */ if( ndigits > NDEC ) ndigits = NDEC; -/* reentrancy addition to use mprec storage pool */ -_REENT_MP_RESULT(ptr) = Balloc (ptr, 3); -_REENT_MP_RESULT_K(ptr) = 3; -outstr = (char *)_REENT_MP_RESULT(ptr); - etoasc( e, outstr, ndigits, mode, ldp ); s = outstr; if( eisinf(e) || eisnan(e) ) |