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Fix buffer size determination.

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Fixes #8082.

[SVN r83967]
This commit is contained in:
John Maddock
2013-04-19 17:45:22 +00:00
parent 06463bec85
commit cc040b0dd5
1 changed files with 7 additions and 5 deletions
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12
src/w32_regex_traits.cpp
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@ -283,9 +283,11 @@ BOOST_REGEX_DECL std::string BOOST_REGEX_CALL w32_cat_get(const cat_type& cat, l
if (r == 0) if (r == 0)
return def; return def;
LPSTR buf = (LPSTR)_alloca( (r + 1) * 2 );
if (::WideCharToMultiByte(CP_ACP, 0, wbuf, r, buf, (r + 1) * 2, NULL, NULL) == 0) int buf_size = 1 + ::WideCharToMultiByte(CP_ACP, 0, wbuf, r, NULL, 0, NULL, NULL);
return def; LPSTR buf = (LPSTR)_alloca(buf_size);
if (::WideCharToMultiByte(CP_ACP, 0, wbuf, r, buf, buf_size, NULL, NULL) == 0)
return def; // failed conversion.
#endif #endif
return std::string(buf); return std::string(buf);
} }
@ -485,7 +487,7 @@ BOOST_REGEX_DECL char BOOST_REGEX_CALL w32_tolower(char c, lcid_type idx)
return c; return c;
if (::WideCharToMultiByte(code_page, 0, &wide_result, 1, result, 2, NULL, NULL) == 0) if (::WideCharToMultiByte(code_page, 0, &wide_result, 1, result, 2, NULL, NULL) == 0)
return c; return c; // No single byte lower case equivalent available
#endif #endif
return result[0]; return result[0];
} }
@ -556,7 +558,7 @@ BOOST_REGEX_DECL char BOOST_REGEX_CALL w32_toupper(char c, lcid_type idx)
return c; return c;
if (::WideCharToMultiByte(code_page, 0, &wide_result, 1, result, 2, NULL, NULL) == 0) if (::WideCharToMultiByte(code_page, 0, &wide_result, 1, result, 2, NULL, NULL) == 0)
return c; return c; // No single byte upper case equivalent available.
#endif #endif
return result[0]; return result[0];
} }