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[libc++] Add configuration define for off_t functions 

Create this define in __config and use it elsewhere, instead of checking
the operating system/library defines in other files. The aim is to
reduce the usage of _WIN32 outside __config. No functional change.

Differential Revision: https://reviews.llvm.org/D25741

llvm-svn: 285582
This commit is contained in:
Shoaib Meenai 2016-10-31 15:09:10 +00:00
parent aa800837d3
commit 73aa38dfb3
2 changed files with 9 additions and 3 deletions
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6
libcxx/include/__config
View File

@ -904,6 +904,12 @@ extern "C" void __sanitizer_annotate_contiguous_container(
#define _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
#endif
#if !defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
#if defined(_WIN32) || defined(_NEWLIB_VERSION)
#define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS
#endif
#endif
#endif // __cplusplus
#endif // _LIBCPP_CONFIG

6
libcxx/include/fstream
View File

@ -813,7 +813,7 @@ basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
default:
return pos_type(off_type(-1));
}
#if defined(_WIN32) || defined(_NEWLIB_VERSION)
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
return pos_type(off_type(-1));
pos_type __r = ftell(__file_);
@ -832,7 +832,7 @@ basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
{
if (__file_ == 0 || sync())
return pos_type(off_type(-1));
#if defined(_WIN32) || defined(_NEWLIB_VERSION)
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
if (fseek(__file_, __sp, SEEK_SET))
return pos_type(off_type(-1));
#else
@ -896,7 +896,7 @@ basic_filebuf<_CharT, _Traits>::sync()
}
}
}
#if defined(_WIN32) || defined(_NEWLIB_VERSION)
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
if (fseek(__file_, -__c, SEEK_CUR))
return -1;
#else