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mbsrtowcs() function in C/C++
In this article we will be discussing the working, syntax and examples of std::mbsrtowcs() function in C++ STL.
What is std::mbsrtowcs()?
std::mbsrtowcs() function is an inbuilt function in C++ STL, which is defined in the <cwchar > header file. mbsrtowcs() means that it converts the null terminated multibyte character string whose first byte is *src to its wide character representation. This function returns the value according to the conversion.
Syntax
size_t mbsrtowcs( wchar_t* pwc, char** str, size_t n, mbstate_t* ps);
Parameters
The function accepts following parameter(s) −
- pwc − This is the pointer to the location we want the output to be stored.
- str − Character string which is used as the input.
- n − It is the number of bytes that are to be checked.
- ps − It is the pointer to the state object when we are interpreting the multibyte string.
Return value
This function return values differ as per the following condition −
- 0 − The function will return zero when the character in str which has to be converted is NULL.
- 1…n− The number of bytes of null ending characters which are converted and stored in string *str.
- -1 − We get this when there is an error while conversion the errno is set to EILSEQ.
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
setlocale(LC_ALL, "en_US.utf8");
const char* ch = "\u0777\u0755";
wchar_t arr[20];
mbstate_t hold = mbstate_t();
int highest = 10;
int val = mbsrtowcs ( arr, &ch, highest, &hold );
wcout << L"Wide characters are: "<< val << endl;
wcout << L"Given Wide character is: " << arr << endl;
return 0;
}Output
Wide characters are: 2 Given Wide character is: ݷݕ
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
setlocale(LC_ALL, "en_US.utf8");
const char* ch = u8"z\u00df\u6c34";
wchar_t arr[20];
mbstate_t hold = mbstate_t();
int highest = 10;
int val = mbsrtowcs ( arr, &ch, highest, &hold );
wcout << L"Total Wide characters are: "<< val << endl;
wcout << L"Given Wide character is: " << arr << endl;
return 0;
}Output
Total Wide characters are: 3 Given Wide character is: zß水
Updated on: 17-Apr-2020
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