From 6d8e16a4637fe1b646260485882f668b0a736cf1 Mon Sep 17 00:00:00 2001 From: Paolo Carlini Date: Tue, 19 Mar 2002 23:33:06 +0100 Subject: [PATCH] locale-inst.cc (__convert_from_v): Add an additional __size parameter in the declarations. 2002-03-19 Paolo Carlini Ulrich Drepper * src/locale-inst.cc (__convert_from_v): Add an additional __size parameter in the declarations. * include/bits/locale_facets.tcc (__convert_from_v): When available (that is, _GLIBCPP_USE_C99 defined) use snprintf instead of sprintf. (num_put::_M_convert_float): Depending on _GLIBCPP_USE_C99 being defined or not, call and use __convert_from_v in the appropriate way. (num_put::_M_convert_int): Same here. (money_put::do_put(long double)): Same here. Co-Authored-By: Ulrich Drepper From-SVN: r51050 --- libstdc++-v3/ChangeLog | 14 +++ libstdc++-v3/include/bits/locale_facets.tcc | 123 +++++++++++++++----- libstdc++-v3/src/locale-inst.cc | 12 +- 3 files changed, 117 insertions(+), 32 deletions(-) diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog index 507821ed0c6..eca9f6f8a7d 100644 --- a/libstdc++-v3/ChangeLog +++ b/libstdc++-v3/ChangeLog @@ -1,3 +1,17 @@ +2002-03-19 Paolo Carlini + Ulrich Drepper + + * src/locale-inst.cc (__convert_from_v): Add an additional + __size parameter in the declarations. + * include/bits/locale_facets.tcc + (__convert_from_v): When available (that is, + _GLIBCPP_USE_C99 defined) use snprintf instead of sprintf. + (num_put::_M_convert_float): Depending on _GLIBCPP_USE_C99 + being defined or not, call and use __convert_from_v in the + appropriate way. + (num_put::_M_convert_int): Same here. + (money_put::do_put(long double)): Same here. + 2002-03-19 Phil Edwards * docs/html/faq/index.html (#3.6): Rewrap and close tags. diff --git a/libstdc++-v3/include/bits/locale_facets.tcc b/libstdc++-v3/include/bits/locale_facets.tcc index f2a1789f6e1..30e66328737 100644 --- a/libstdc++-v3/include/bits/locale_facets.tcc +++ b/libstdc++-v3/include/bits/locale_facets.tcc @@ -592,16 +592,15 @@ namespace std return __beg; } - - // The following code uses sprintf() to convert floating point - // values for insertion into a stream. An optimization would be to - // replace sprintf() with code that works directly on a wide buffer - // and then use __pad to do the padding. It would be good - // to replace sprintf() anyway to avoid accidental buffer overruns - // and to gain back the efficiency that C++ provides by knowing up - // front the type of the values to insert. This implementation - // follows the C++ standard fairly directly as outlined in 22.2.2.2 - // [lib.locale.num.put] + // The following code uses snprintf (or sprintf(), when _GLIBCPP_USE_C99 + // is not defined) to convert floating point values for insertion into a + // stream. An optimization would be to replace them with code that works + // directly on a wide buffer and then use __pad to do the padding. + // It would be good to replace them anyway to gain back the efficiency + // that C++ provides by knowing up front the type of the values to insert. + // Also, sprintf is dangerous since may lead to accidental buffer overruns. + // This implementation follows the C++ standard fairly directly as + // outlined in 22.2.2.2 [lib.locale.num.put] template template _OutIter @@ -613,13 +612,38 @@ namespace std // we get the full available precision. const int __max_digits = numeric_limits<_ValueT>::digits10 + 1; streamsize __prec = __io.precision(); - // Protect against sprintf() buffer overflows. + if (__prec > static_cast(__max_digits)) __prec = static_cast(__max_digits); // Long enough for the max format spec. char __fbuf[16]; + // [22.2.2.2.2] Stage 1, numeric conversion to character. + int __len; +#ifdef _GLIBCPP_USE_C99 + // First try a buffer perhaps big enough (for sure sufficient for + // non-ios_base::fixed outputs) + int __cs_size = __max_digits * 3; + char* __cs = static_cast(__builtin_alloca(__cs_size)); + + const bool __fp = _S_format_float(__io, __fbuf, __mod, __prec); + if (__fp) + __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale, __prec); + else + __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale); + + // If the buffer was not large enough, try again with the correct size. + if (__len >= __cs_size) + { + __cs_size = __len + 1; + __cs = static_cast(__builtin_alloca(__cs_size)); + if (__fp) + __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale, __prec); + else + __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale); + } +#else // Consider the possibility of long ios_base::fixed outputs const bool __fixed = __io.flags() & ios_base::fixed; const int __max_exp = numeric_limits<_ValueT>::max_exponent10; @@ -632,12 +656,11 @@ namespace std : __max_digits * 3; char* __cs = static_cast(__builtin_alloca(__cs_size)); - int __len; - // [22.2.2.2.2] Stage 1, numeric conversion to character. if (_S_format_float(__io, __fbuf, __mod, __prec)) - __len = __convert_from_v(__cs, __fbuf, __v, _S_c_locale, __prec); + __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale, __prec); else - __len = __convert_from_v(__cs, __fbuf, __v, _S_c_locale); + __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale); +#endif return _M_widen_float(__s, __io, __fill, __cs, __len); } @@ -649,13 +672,28 @@ namespace std char __modl, _ValueT __v) const { // [22.2.2.2.2] Stage 1, numeric conversion to character. - // Leave room for "+/-," "0x," and commas. This size is - // arbitrary, but should work. - char __cs[64]; + // Long enough for the max format spec. char __fbuf[16]; _S_format_int(__io, __fbuf, __mod, __modl); - int __len = __convert_from_v(__cs, __fbuf, __v, _S_c_locale); +#ifdef _GLIBCPP_USE_C99 + // First try a buffer perhaps big enough. + int __cs_size = 64; + char* __cs = static_cast(__builtin_alloca(__cs_size)); + int __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale); + // If the buffer was not large enough, try again with the correct size. + if (__len >= __cs_size) + { + __cs_size = __len + 1; + __cs = static_cast(__builtin_alloca(__cs_size)); + __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale); + } +#else + // Leave room for "+/-," "0x," and commas. This size is + // arbitrary, but should be largely sufficient. + char __cs[128]; + int __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale); +#endif return _M_widen_int(__s, __io, __fill, __cs, __len); } @@ -1111,12 +1149,26 @@ namespace std { const locale __loc = __io.getloc(); const ctype<_CharT>& __ctype = use_facet >(__loc); +#ifdef _GLIBCPP_USE_C99 + // First try a buffer perhaps big enough. + int __cs_size = 64; + char* __cs = static_cast(__builtin_alloca(sizeof(char) * __cs_size)); + int __len = __convert_from_v(__cs, __cs_size, "%.01Lf", __units, _S_c_locale); + // If the buffer was not large enough, try again with the correct size. + if (__len >= __cs_size) + { + __cs_size = __len + 1; + __cs = static_cast(__builtin_alloca(sizeof(char) * __cs_size)); + __len = __convert_from_v(__cs, __cs_size, "%.01Lf", __units, _S_c_locale); + } +#else // max_exponent10 + 1 for the integer part, + 4 for sign, decimal point, // decimal digit, '\0'. - const int __n = numeric_limits::max_exponent10 + 5; - char* __cs = static_cast(__builtin_alloca(sizeof(char) * __n)); - _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __n)); - int __len = __convert_from_v(__cs, "%.01Lf", __units, _S_c_locale); + const int __cs_size = numeric_limits::max_exponent10 + 5; + char* __cs = static_cast(__builtin_alloca(sizeof(char) * __cs_size)); + int __len = __convert_from_v(__cs, 0, "%.01Lf", __units, _S_c_locale); +#endif + _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __cs_size)); __ctype.widen(__cs, __cs + __len, __ws); string_type __digits(__ws); return this->do_put(__s, __intl, __io, __fill, __digits); @@ -1894,20 +1946,39 @@ namespace std const __c_locale& __cloc, int __base = 10); // Convert numeric value of type _Tv to string and return length of string. + // If snprintf is available use it, otherwise fall back to the unsafe sprintf + // which, in general, can be dangerous and should be avoided. +#ifdef _GLIBCPP_USE_C99 + template + int + __convert_from_v(char* __out, const int __size, const char* __fmt, + _Tv __v, const __c_locale&, int __prec = -1) + { + int __ret; + const char* __old = setlocale(LC_ALL, "C"); + if (__prec >= 0) + __ret = snprintf(__out, __size, __fmt, __prec, __v); + else + __ret = snprintf(__out, __size, __fmt, __v); + setlocale(LC_ALL, __old); + return __ret; + } +#else template int - __convert_from_v(char* __out, const char* __fmt, _Tv __v, + __convert_from_v(char* __out, const int, const char* __fmt, _Tv __v, const __c_locale&, int __prec = -1) { int __ret; const char* __old = setlocale(LC_ALL, "C"); if (__prec >= 0) - __ret = sprintf(__out, __fmt, __prec, __v); + __ret = sprintf(__out, __fmt, __prec, __v); else - __ret = sprintf(__out, __fmt, __v); + __ret = sprintf(__out, __fmt, __v); setlocale(LC_ALL, __old); return __ret; } +#endif // Construct correctly padded string, as per 22.2.2.2.2 // Assumes diff --git a/libstdc++-v3/src/locale-inst.cc b/libstdc++-v3/src/locale-inst.cc index 9e449e66bda..8662c106528 100644 --- a/libstdc++-v3/src/locale-inst.cc +++ b/libstdc++-v3/src/locale-inst.cc @@ -461,28 +461,28 @@ namespace std template int - __convert_from_v(char*, const char*, double, const __c_locale&, int); + __convert_from_v(char*, const int, const char*, double, const __c_locale&, int); template int - __convert_from_v(char*, const char*, long double, const __c_locale&, int); + __convert_from_v(char*, const int, const char*, long double, const __c_locale&, int); template int - __convert_from_v(char*, const char*, long, const __c_locale&, int); + __convert_from_v(char*, const int, const char*, long, const __c_locale&, int); template int - __convert_from_v(char*, const char*, unsigned long, + __convert_from_v(char*, const int, const char*, unsigned long, const __c_locale&, int); template int - __convert_from_v(char*, const char*, long long, const __c_locale&, int); + __convert_from_v(char*, const int, const char*, long long, const __c_locale&, int); template int - __convert_from_v(char*, const char*, unsigned long long, + __convert_from_v(char*, const int, const char*, unsigned long long, const __c_locale&, int); template -- 2.30.2