ArrayReallocation.c

#include<stdio.h>
#include<stdlib.h>

char* getLine(void){
        const size_t sizeIncrement = 10;
        char*  buffer = malloc(sizeIncrement);
        char* currentPosition = buffer;
        size_t maximumLength = sizeIncrement;
        size_t length = 0;
        char character;

        if(currentPosition==NULL){return NULL;}

        while(1){
           character = fgetc(stdin);
           if(character=='\n'){break;}
  
           if(++length>=maximumLength){
                  char *newBuffer = realloc(buffer,maximumLength+=sizeIncrement);
                  
                  if(newBuffer==NULL){
                         free(buffer);
                         return NULL;
                  }

                 currentPosition = newBuffer + (currentPosition-buffer);
                 buffer = newBuffer;
          }
            *currentPosition++=character;
        }
        *currentPosition = '\0';
         return buffer;
    }

    void main(){
          printf("\n%s\n",getLine());
     }