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C library - strxfrm() function

The C library strxfrm() function can be used to transform the first characters from the source string into current locale and place them in the destination string.

In Computer System, locale is a set of information that present the specific region or culture based on conventions and settings.

Following is the syntax of the C library strxfrm() function −

size_t strxfrm(char *dest, const char *src, size_t n)

This function accepts the following parameters −

• dest − This is the pointer to the destination array where the content is to be copied. It can be a null pointer if the parameter for n is zero.
• src − This is the C string to be transformed into current locale.
• n − The maximum number of characters to be copied to str1.

This function returns the length of the transformed string that doesn't include the termination of null-character('\0').

Following is the C library program that demonstrates the usage of strxfrm() function.

#include <stdio.h>
#include <string.h>

int main () {
   char dest[20];
   char src[20];
   int len;

   strcpy(src, "Tutorials Point");
   len = strxfrm(dest, src, 20);

   printf("Length of string |%s| is: |%d|", dest, len);
   
   return(0);
}

On execution of above code, we get the following result −

Length of string |Tutorials Point| is: |15|

In this example, we illustrate the result of applying locale-specific transformation using strxfrm() function.

#include <stdio.h>
#include <string.h>

int main() {
   // source string into current locale
   char str2[] = "Delhi to Hyderabad";
   // declare the empty character array
   char str1[30];

   printf("%lu\n", strxfrm(str1, str2, 4));
   printf("%s\n", str1);
   printf("%s\n", str2);

   return 0;
}

On execution of above code, we get the following result −

18
Delh
Delhi to Hyderabad

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