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strtold: set errno to ERANGE on underflow per POSIX

Browse Source 
https://pubs.opengroup.org/onlinepubs/9699919799/functions/strtod.html
This commit is contained in:
Bruno Haible
2019-12-16 15:11:47 +01:00
committed by Corinna Vinschen
parent 29ba52da95
commit c81a76b3b9
1 changed files with 21 additions and 0 deletions
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21
newlib/libc/stdlib/strtodg.c
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@@ -348,6 +348,9 @@ rvOK (struct _reent *p, double d, FPI *fpi, Long *exp, __ULong *bits, int exact,
if (k > nb || fpi->sudden_underflow) { if (k > nb || fpi->sudden_underflow) {
b->_wds = inex = 0; b->_wds = inex = 0;
*irv = STRTOG_Underflow | STRTOG_Inexlo; *irv = STRTOG_Underflow | STRTOG_Inexlo;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
} }
else { else {
k1 = k - 1; k1 = k - 1;
@@ -362,9 +365,15 @@ rvOK (struct _reent *p, double d, FPI *fpi, Long *exp, __ULong *bits, int exact,
if (carry) { if (carry) {
b = increment(p, b); b = increment(p, b);
inex = STRTOG_Inexhi | STRTOG_Underflow; inex = STRTOG_Inexhi | STRTOG_Underflow;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
} }
else if (lostbits) else if (lostbits)
inex = STRTOG_Inexlo | STRTOG_Underflow; inex = STRTOG_Inexlo | STRTOG_Underflow;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
} }
} }
else if (e > fpi->emax) { else if (e > fpi->emax) {
@@ -761,6 +770,9 @@ _strtodg_l (struct _reent *p, const char *s00, char **se, FPI *fpi, Long *exp,
rvb->_x[0] = 0; rvb->_x[0] = 0;
*exp = emin; *exp = emin;
irv = STRTOG_Underflow | STRTOG_Inexlo; irv = STRTOG_Underflow | STRTOG_Inexlo;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
goto ret; goto ret;
} }
rvb->_x[0] = rvb->_wds = rvbits = 1; rvb->_x[0] = rvb->_wds = rvbits = 1;
@@ -940,6 +952,9 @@ _strtodg_l (struct _reent *p, const char *s00, char **se, FPI *fpi, Long *exp,
rvb->_wds = 0; rvb->_wds = 0;
rve = emin; rve = emin;
irv = STRTOG_Underflow | STRTOG_Inexlo; irv = STRTOG_Underflow | STRTOG_Inexlo;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
break; break;
} }
adj0 = dval(adj) = 1.; adj0 = dval(adj) = 1.;
@@ -1083,12 +1098,18 @@ _strtodg_l (struct _reent *p, const char *s00, char **se, FPI *fpi, Long *exp,
if (sudden_underflow) { if (sudden_underflow) {
rvb->_wds = 0; rvb->_wds = 0;
irv = STRTOG_Underflow | STRTOG_Inexlo; irv = STRTOG_Underflow | STRTOG_Inexlo;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
} }
else { else {
irv = (irv & ~STRTOG_Retmask) | irv = (irv & ~STRTOG_Retmask) |
(rvb->_wds > 0 ? STRTOG_Denormal : STRTOG_Zero); (rvb->_wds > 0 ? STRTOG_Denormal : STRTOG_Zero);
if (irv & STRTOG_Inexact) if (irv & STRTOG_Inexact)
irv |= STRTOG_Underflow; irv |= STRTOG_Underflow;
#ifndef NO_ERRNO
errno = ERANGE;
#endif
} }
} }
if (se) if (se)