C mblen() function
C mblen() function - Get number of bytes in a character
Syntax mblen() function
int mblen(const char *str, size_t n)
The mblen() function is used to get the length in bytes of the multibyte character pointed to by string. n represents the maximum number of bytes examined.
Parameters mblen() function
Name | Description | Required /Optional |
---|---|---|
str | Address of a multibyte-character byte sequence. | Required |
n | This is the maximum number of bytes to be checked for character length. | Required |
Return value from mblen()
If string is NULL, the mblen() function returns:
- A non-zero value indicates that the active locale supports mixed-byte strings.The function initializes the state variable.
- Zero otherwise.
If string is not NULL, mblen() returns:
- A non-zero value indicates that the active locale supports mixed-byte strings. The function initializes the state variable.
- Zero otherwise.
Example: mblen() function
The following example shows the usage of mblen() function.
#include <stdlib.h>
#include <stdio.h>
int main( void )
{
int i;
char *mbstr = (char *)malloc( sizeof( char ) );
i = mblen( mbstr, MB_CUR_MAX );
printf( "Length in bytes of multibyte character %x: %u\n", *mbstr, i );
mbstr = NULL;
i = mblen( mbstr, MB_CUR_MAX );
printf( "Length in bytes of NULL multibyte character %x: %u\n", mbstr, i );
}
Output:
Length in bytes of multibyte character ffffff80: 1 Length in bytes of NULL multibyte character 0: 0
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C Programming: Tips of the Day
What's the point of const pointers?
const is a tool which you should use in pursuit of a very important C++ concept:
Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.
Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:
void foo(int* ptr) { ptr = 0;// oops, I meant *ptr = 0 }
If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.
Ref : https://bit.ly/33Cdn3Q
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