strnset() – strset() — Set Characters in String

Format

#include <string.h>
char *strnset(char *string, int c, size_t n);
char *strset(char *string, int c);

Note: The strnset and strset functions are available for C++ programs. They are available for C only when the program defines the __cplusplus__strings__ macro.

Language Level

Extension

Threadsafe

Yes

Description

strnset sets, at most, the first n characters of string to c (converted to a char). If n is greater than the length of string, the length of string is used in place of n. strset sets all characters of string, except the ending null character (\0), to c (converted to a char). For both functions, the string is a null-terminated string.

Return Value

Both strset and strnset return a pointer to the altered string. There is no error return value.

Example

In this example, strnset sets not more than four characters of a string to the character 'x'. Then the strset function changes any non-null characters of the string to the character 'k'.

#include <stdio.h>
#include <string.h>
int main(void)
{
   char str[] = "abcdefghi";
   printf("This is the string: %s\n", str);
   printf("This is the string after strnset: %s\n", strnset((char*)str, 'x', 4));
   printf("This is the string after strset: %s\n", strset((char*)str, 'k'));
   return 0;
}

The output should be:

      This is the string: abcdefghi
      This is the string after strnset: xxxxefghi
      This is the string after strset: kkkkkkkkk