binaryread.c

#include <stdio.h>		/* fir fopen, fprintf an fread */
#include <stddef.h>		/* fir sizt_t */
#include <stdint.h> 		/* fir uint8_t */
#include <stdlib.h>		/* fir calloc */

#define PATH "binary-file.bin"

int
main(int argc, char *argv[]) {
  FILE *f;
  f = fopen(PATH, "rb"); 	/* rb steet fir "read" and "binary",
				   de modus an deems de d'datei wells
				   benotzen */

  /* Bessi error handling */
  if (f == NULL) {
    fprintf(stderr, "Could not open file\n");
    return -1;
  }

  size_t octets_in_file = 100;	/* Wanns de scho wees wei grouss deng
				   datei as */
  uint8_t *data;
  data = (uint8_t *)calloc(sizeof(uint8_t), octets_in_file);
  if (data == NULL) {
    fprintf(stderr, "Could not allocate memory\n");
    return -1;
  }
  
  int octets_read = fread((void *)data, sizeof(uint8_t), octets_in_file, f);
  printf("Read %d octets from file\n", octets_read);

  /* Wat gelies gouf printen */
  for (int i; i < octets_read; ++i) {
    printf("0x%02X ", data[i]);
    if (i != 0 && i % 10 == 0) {
      printf("\n");
    }
  }

  /* Exit status setzen falls gewenscht */
  if (octets_read == octets_in_file) {
    return 0;
  } else {
    return -1;
  }
}

// Ze compileiren z.B. mat: gcc -std=c99 -Wpedantic -Wall -g binaryread.c -o binaryread