A function that swaps the elements of a dynamically allocated string array in C language

Contents

Swap the ath and bth of the string array passed by arr.

important point

--It does not take into account that realloc will fail. --All the caveats with realloc apply.

code

str_swap.c

#include <stdlib.h>
#include <string.h> 

void str_swap(char** arr, int a,int b ){
    char* tmp = realloc(tmp,sizeof(char)*(strlen(arr[b])+1));
    strcpy(tmp,arr[b]);
    arr[b] = realloc(arr[b],sizeof(char)*(strlen(arr[a])+1));
    strcpy(arr[b],arr[a]);
    arr[a]= realloc(arr[a],sizeof(char)*(strlen(tmp)+1));
    strcpy(arr[a],tmp);
    free(tmp);
}

Background

It was necessary to swap any element of a string array that had elements with different string lengths. Since each element has only the memory of its own length, it cannot be assigned a character string longer than that. I have reallocated it.

Other

First post!