main.c

/*
 * Reads from a file and reads out a field in a hardcoded position
 *
 * By Kevin Raoofi
 */

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

#define LINE_SEEK_AMOUNT (0x770)
#define TIME_OFFSET (61)

#define TIME_SIZE (10)

int main(int argc, char **argv)
{
  if(argc < 2) {
    fprintf(stderr, "You must enter exactly one argument to the file to read\n");
    return 1;
  }
  
  char time[TIME_SIZE];
  FILE *in;
  in = fopen(argv[1], "r");
  fseek(in, LINE_SEEK_AMOUNT + TIME_OFFSET, SEEK_SET);
  int result = fread(&time, 1, TIME_SIZE, in);
  fclose(in);
  if (result != TIME_SIZE) {
    fprintf(stderr,"Result size is %d instead of %d!\n", result, TIME_SIZE);
    return 2;
  }
  puts(time);

  return 0;
}

Makefile

# This is a GNU Make file which describes how to build the application's
# DLL/SO for both x86 Windows and Linux systems.
#
#
# To do a full compile, invoke 'make all'
# To build just the test executable, invoke 'make bins'
#

CC:=$(shell which cc)
CFLAGS=-Wall -pedantic -O3 -std=c99

CFILES=./main.c

OUT_DIR=build

BIN_DIR=$(OUT_DIR)/bin

.PHONY: all bins clean fresh not_do assembly

VPATH =lib

all: bins

do: all

not_do:
	$(error 'make do because not do is not an option')

bins: 
	@mkdir -p $(BIN_DIR)
	$(CC) $(CFLAGS) $(LIBS) $(CFILES) -o $(BIN_DIR)/reader

$(OUT_DIR):
	@mkdir -p $(OUT_DIR)

clean:
	@rm -r $(OUT_DIR)
	@rm -f *.o

%.o: %.c $(DEPS)
	$(CC) -c -o $@ $< $(CFLAGS)

%.s: %.c
	$(CC) $(CFLAGS) $(LIBS) $(CFILES) -S $<

fresh: | clean all