Implementation of strncat() in c

C Programming: How to Write Your Own strncat() Function

The implementation of strncat() in C is a function that appends the specified number of characters from the source string at the end of the destination string and returns a pointer to the destination string.

The strncat() function is declared in the <string.h> header file and its syntax is as follows:

char *strncat(char *dest, const char *src, size_t n);

Parameters:

• dest: A pointer to the null-terminated destination string.
• src: A pointer to the null-terminated source string.
• n: The number of characters to append from the source string.

Return value:

A pointer to the destination string.

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

int main() {
  char dest[] = "Hello";
  char src[] = ", world!";

  // Append the first 5 characters from the source string to the destination string.
  char *ptr = strncat(dest, src, 5);

  // Print the destination string.
  printf("%s\n", dest);

  return 0;
}

Output:

Hello, w!

implementation of strncat() in C typically works as follows:

1. It finds the end of the destination string using the strlen() function.
2. It copies the first n characters from the source string to the end of the destination string.
3. It appends a null-terminator character to the end of the destination string.

Simple implementation of the strncat() function in C:

char *strncat(char *dest, const char *src, size_t n) {
  char *ptr = dest + strlen(dest);

  while (n-- && *src != '\0') {
    *ptr++ = *src++;
  }

  *ptr = '\0';

  return dest;
}

The strncat() function is a useful function for appending strings together. It is particularly useful when you need to append a limited number of characters from the source string.

Further Reading:

Implementation of strncat() in C

add source string at the end of destination string

comparing two string using strcmp and strncmp

Design a function to copy to copy string into destination string using strcpy and strncpy

how to implement implementation of strncpy in c

Design a function to calculate the length of the string using strlen

pre defined string based function

Design a function using my_strcpy and using my_strchr we need to select given char in given string

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