RECOVER.C

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char *argv[])
{   int n=0;
    // ensure proper usage
    if (argc != 2)
    {
        fprintf(stderr, "Usage: ./copy infile outfile\n");
        return 1;
    }
     char *infile = argv[1];
      // open input file
    FILE *inptr = fopen(infile, "r");
    if (inptr == NULL)
    {
        fprintf(stderr, "Could not open %s.\n", infile);
        return 2;
    }
     int flag =0;
    uint8_t *buffer = malloc(512*sizeof(uint8_t));
     FILE *img;
     char *a = malloc(sizeof(uint8_t)); ;
    while (fread(buffer,1,512,inptr)==512)
    {
        if(((*buffer)==0xff&&(*buffer+1)==0xd8&&(*buffer+2)==0xff&&((*buffer+3) & 0xf0)==0xe0)&&flag==0)
            {

                sprintf(a,"%03i.jpg",n);
                n++;
                flag =1;
                img = fopen(a,"w");
               for(int x=0;x<512;x++)
                {
                  fwrite(buffer,1,1,img);
                }

        if(((*buffer)==0xff&&(*buffer+1)==0xd8&&(*buffer+2)==0xff&&((*buffer+3) & 0xf0)==0xe0)&&flag==1)
            {
                fclose(img);
                sprintf(a,"%03i.jpg",n);
                n++;
                flag =1;
                FILE *img = fopen(a,"w");
               fwrite(buffer,512,1,img);
            }
            }
            else if(flag==1)
            {
                fwrite(buffer,512,1,img);
            }
            else
            break;



    }
       fclose(inptr);
}
OUTPUT
$ make recover
clang -fsanitize=integer -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow    recover.c  -lcrypt -lcs50 -lm -o recover
recover.c:44:23: error: declaration shadows a local variable [-Werror,-Wshadow]
                FILE *img = fopen(a,"w");
                      ^
recover.c:22:12: note: previous declaration is here
     FILE *img;
           ^
1 error generated.
make: *** [recover] Error 1
~/workspace/recover/ $