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libstdc++: Don't use std::tolower in <charconv> [PR103911]

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As with std::isdigit in r12-6281-gc83ecfbe74a5cf, we shouldn't be using
std::tolower in <charconv> either.

	PR libstdc++/103911

libstdc++-v3/ChangeLog:

	* src/c++17/floating_from_chars.cc (find_end_of_float): Accept
	two delimeters for the exponent part in the form of a possibly
	NULL string of length two.  Don't use std::tolower.
	(pattern): Adjust calls to find_end_of_float accordingly.

(cherry picked from commit 86d821ddf5)
This commit is contained in:
Patrick Palka 2022-05-02 07:01:33 -04:00
parent 39c56695c7
commit eed2cd48cd
1 changed files with 5 additions and 6 deletions
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11
libstdc++-v3/src/c++17/floating_from_chars.cc
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@ -40,7 +40,6 @@
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <locale.h>
#include <bits/functexcept.h>
#if _GLIBCXX_HAVE_XLOCALE_H
@ -142,10 +141,10 @@ namespace
// Find initial portion of [first, last) containing a floating-point number.
// The string `digits` is either `dec_digits` or `hex_digits`
// and `exp` is 'e' or 'p' or '\0'.
// and `exp` is "eE", "pP" or NULL.
const char*
find_end_of_float(const char* first, const char* last, const char* digits,
char exp)
const char *exp)
{
while (first < last && strchr(digits, *first) != nullptr)
++first;
@ -155,7 +154,7 @@ namespace
while (first < last && strchr(digits, *first))
++first;
}
if (first < last && exp != 0 && std::tolower((unsigned char)*first) == exp)
if (first < last && exp != nullptr && (*first == exp[0] || *first == exp[1]))
{
++first;
if (first < last && (*first == '-' || *first == '+'))
@ -237,7 +236,7 @@ namespace
if ((last - first + 2) > buffer_resource::guaranteed_capacity())
{
last = find_end_of_float(first + neg, last, digits, 'p');
last = find_end_of_float(first + neg, last, digits, "pP");
#ifndef __cpp_exceptions
if ((last - first + 2) > buffer_resource::guaranteed_capacity())
{
@ -261,7 +260,7 @@ namespace
if ((last - first) > buffer_resource::guaranteed_capacity())
{
last = find_end_of_float(first + neg, last, digits,
"e"[fmt == chars_format::fixed]);
fmt == chars_format::fixed ? nullptr : "eE");
#ifndef __cpp_exceptions
if ((last - first) > buffer_resource::guaranteed_capacity())
{