wperror.cpp File Reference

#include <corecrt_internal.h>
#include <corecrt_internal_lowio.h>
#include <io.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

Include dependency graph for wperror.cpp:

Go to the source code of this file.

Functions
void __cdecl	_wperror (wchar_t const *const wide_user_prefix)

Function Documentation

_wperror()

void __cdecl _wperror

(

wchar_t const *const

wide_user_prefix

)

Definition at line 38 of file wperror.cpp.

{
    // If the user did not provide a prefix, we can just call perror:
    if (wide_user_prefix == nullptr || wide_user_prefix[0] == L'\0')
        return perror(nullptr);
 
    // Otherwise, we need to convert the prefix into a narrow string then pass
    // it to perror:
    size_t required_count = 0;
    _ERRCHECK_EINVAL_ERANGE(wcstombs_s(&required_count, nullptr, 0, wide_user_prefix, INT_MAX));
    if (required_count == 0)
        return;
 
    __crt_unique_heap_ptr<char> const narrow_user_prefix(_calloc_crt_t(char, required_count));
    if (narrow_user_prefix.get() == nullptr)
        return;
 
    errno_t const conversion_result = _ERRCHECK_EINVAL_ERANGE(wcstombs_s(
        nullptr,
        narrow_user_prefix.get(),
        required_count,
        wide_user_prefix,
        _TRUNCATE));
 
    if (conversion_result != 0)
        return;
 
    return perror(narrow_user_prefix.get());
}