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Fix strtod("-0x", NULL).

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* libc/stdlib/strtod.c (_strtod_r): Fall back to 0 if hex parse
fails.
This commit is contained in:
Eric Blake
2008-02-21 17:14:14 +00:00
parent 1f71763a62
commit 7a44c13ecb
2 changed files with 39 additions and 23 deletions
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24
newlib/libc/stdlib/strtod.c
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@@ -14,7 +14,7 @@ ANSI_SYNOPSIS
double strtod(const char *<[str]>, char **<[tail]>);
float strtof(const char *<[str]>, char **<[tail]>);
double _strtod_r(void *<[reent]>,
double _strtod_r(void *<[reent]>,
const char *<[str]>, char **<[tail]>);
TRAD_SYNOPSIS
@@ -37,12 +37,19 @@ DESCRIPTION
producing a substring which can be converted to a double
value. The substring converted is the longest initial
subsequence of <[str]>, beginning with the first
non-whitespace character, that has the format:
.[+|-]<[digits]>[.][<[digits]>][(e|E)[+|-]<[digits]>]
non-whitespace character, that has one of these formats:
.[+|-]<[digits]>[.[<[digits]>]][(e|E)[+|-]<[digits]>]
.[+|-].<[digits]>[(e|E)[+|-]<[digits]>]
.[+|-](i|I)(n|N)(f|F)[(i|I)(n|N)(i|I)(t|T)(y|Y)]
.[+|-](n|N)(a|A)(n|N)[<(>[<[hexdigits]>]<)>]
.[+|-]0(x|X)<[hexdigits]>[.[<[hexdigits]>]][(p|P)[+|-]<[digits]>]
.[+|-]0(x|X).<[hexdigits]>[(p|P)[+|-]<[digits]>]
The substring contains no characters if <[str]> is empty, consists
entirely of whitespace, or if the first non-whitespace
character is something other than <<+>>, <<->>, <<.>>, or a
digit. If the substring is empty, no conversion is done, and
digit, and cannot be parsed as infinity or NaN. If the platform
does not support NaN, then NaN is treated as an empty substring.
If the substring is empty, no conversion is done, and
the value of <[str]> is stored in <<*<[tail]>>>. Otherwise,
the substring is converted, and a pointer to the final string
(which will contain at least the terminating null character of
@@ -52,7 +59,8 @@ DESCRIPTION
This implementation returns the nearest machine number to the
input decimal string. Ties are broken by using the IEEE
round-even rule.
round-even rule. However, <<strtof>> is currently subject to
double rounding errors.
The alternate function <<_strtod_r>> is a reentrant version.
The extra argument <[reent]> is a pointer to a reentrancy structure.
@@ -176,7 +184,7 @@ _DEFUN (ULtod, (L, bits, exp, k),
L[_0] |= 0x80000000L;
}
#endif /* !NO_HEX_FP */
#ifdef INFNAN_CHECK
static int
_DEFUN (match, (sp, t),
@@ -254,6 +262,9 @@ _DEFUN (_strtod_r, (ptr, s00, se),
switch(s[1]) {
case 'x':
case 'X':
/* If the number is not hex, then the parse of
0 is still valid. */
s00 = s + 1;
{
#if defined(FE_DOWNWARD) && defined(FE_TONEAREST) && defined(FE_TOWARDZERO) && defined(FE_UPWARD)
FPI fpi1 = fpi;
@@ -268,7 +279,6 @@ _DEFUN (_strtod_r, (ptr, s00, se),
switch((i = gethex(ptr, &s, &fpi1, &exp, &bb, sign)) & STRTOG_Retmask) {
case STRTOG_NoNumber:
s = s00;
sign = 0;
case STRTOG_Zero:
break;
default: