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strtod: Do not consume "x" in incomplete hex input 

Adapted from upstream glibc commits:
* 405698e946dbed472491f85867eb511eb080e05a
* 43b9d657408fbf47a47934f9e7c84ed87f7f5a18

Fixes #13949
This commit is contained in:
Andrew Aldridge 2018-01-11 21:22:52 +00:00 committed by waddlesplash
parent a820f1f01d
commit f6d25a3a81
1 changed files with 20 additions and 9 deletions
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29
src/system/libroot/posix/glibc/stdlib/strtod.c
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@ -674,18 +674,29 @@ INTERNAL (STRTOF) (nptr, endptr, group LOCALE_PARAM)
/* If no other digit but a '0' is found the result is 0.0.
Return current read pointer. */
if ((c < L_('0') || c > L_('9'))
&& (base == 16 && (c < TOLOWER (L_('a')) || c > TOLOWER (L_('f'))))
if (!((c >= L_('0') && c <= L_('9'))
|| (base == 16 && ((CHAR_TYPE) TOLOWER (c) >= L_('a')
&& (CHAR_TYPE) TOLOWER (c) <= L_('f')))
|| (
#ifdef USE_WIDE_CHAR
&& c != decimal
c == (wint_t) decimal
#else
&& ({ for (cnt = 0; decimal[cnt] != '\0'; ++cnt)
if (decimal[cnt] != cp[cnt])
break;
decimal[cnt] != '\0'; })
({ for (cnt = 0; decimal[cnt] != '\0'; ++cnt)
if (decimal[cnt] != cp[cnt])
break;
decimal[cnt] == '\0'; })
#endif
&& (base == 16 && (cp == start_of_digits || TOLOWER (c) != L_('p')))
&& (base != 16 && TOLOWER (c) != L_('e')))
/* '0x.' alone is not a valid hexadecimal number.
'.' alone is not valid either, but that has been checked
already earlier. */
&& (base != 16
|| cp != start_of_digits
|| (cp[decimal_len] >= L_('0') && cp[decimal_len] <= L_('9'))
|| ((CHAR_TYPE) TOLOWER (cp[decimal_len]) >= L_('a')
&& (CHAR_TYPE) TOLOWER (cp[decimal_len]) <= L_('f'))))
|| (base == 16 && (cp != start_of_digits
&& (CHAR_TYPE) TOLOWER (c) == L_('p')))
|| (base != 16 && (CHAR_TYPE) TOLOWER (c) == L_('e'))))
{
tp = correctly_grouped_prefix (start_of_digits, cp, thousands, grouping);
/* If TP is at the start of the digits, there was no correctly