fread

// from the linux programmer's manual, fread(3)
#include <stdio.h>
#include <stdlib.h>

int main()
{
  FILE *fp = fopen("/bin/sh", "rb");
  if (!fp) {
    perror("fopen");
    return EXIT_FAILURE;
  }

  unsigned char buffer[4];

  size_t ret = fread(buffer, 4, 1, fp);
  if (ret != sizeof(*buffer)) {
    fprintf(stderr, "fread() failed: %zu\n", ret);
    exit(EXIT_FAILURE);
  }

  printf("ELF magic: %#04x%02x%02x%02x\n", buffer[0], buffer[1],
         buffer[2], buffer[3]);

  fclose(fp);

  return 0;
}

Posted by: Guest on December-16-2020

//from tutorialspoint.com #include <stdio.h> #include <string.h> int main () { FILE *fp; char c[] = "this is tutorialspoint"; char buffer[100]; /* Open file for both reading and writing */ fp = fopen("file.txt", "w+"); /* Write data to the file */ fwrite(c, strlen(c) + 1, 1, fp); /* Seek to the beginning of the file */ fseek(fp, 0, SEEK_SET); /* Read and display data */ fread(buffer, strlen(c)+1, 1, fp); printf("%s\n", buffer); fclose(fp); return(0); }

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