int main(int argc, char *argv[]){
FILE *input_file = NULL;
FILE *output_file = NULL;
if (argc == ARG_COUNT_1){
//argv[FLAG] may either be -b or -t
if(strcmp(argv[FLAG], "-b")==0){
//open input and output files
if ((input_file = fopen(argv[INFILE], "rb")) == NULL){
fprintf(stderr, "Input file could not be opened \n");
exit(1);
}
if ((output_file = fopen(argv[OUTFILE], "w")) == NULL){
fprintf(stderr, "Output file could not be opened \n");
exit(1);
}
//convert binary file to text file
binary_to_text(input_file, output_file);
}
else{
if(strcmp(argv[FLAG], "-t")==0){
//open input and output files
if ((input_file = fopen(argv[INFILE], "r")) == NULL){
fprintf(stderr, "Input file could not be opened \n");
exit(1);
}
if ((output_file = fopen(argv[OUTFILE], "wb")) == NULL){
fprintf(stderr, "Output file could not be opened \n");
exit(1);
}
//convert text file to binary file
text_to_binary(input_file, output_file);
}
else{
fprintf(stderr, "Expect either -b or -t as flags. \n"); exit(1);
}
}
}
if (argc == ARG_COUNT_2){
//argv[FLAG] must be -s
if(strcmp(argv[FLAG], "-s")==0){
if ((input_file = fopen(argv[INFILE], "rb")) == NULL){
fprintf(stderr, "Input file could not be opened \n");
exit(1);
}
//calculate statistics and print to stdout
statistics(input_file);
}
else{
fprintf(stderr, "Expect -s as the flag. \n"); exit(1);
}
}
return 0;
}
int main(int argc, char **argv) {
FILE *file = stdin;
int opt;
static struct option options[] =
{
{"help", no_argument, 0, 'h'},
{"file", required_argument, 0, 'f'},
{0, 0, 0, 0}
};
while ((opt=getopt_long(argc, argv, "+f:h", options, NULL)) != -1) {
switch (opt) {
case 'f':
file = fopen(optarg, "r");
if (file == NULL) {
perror("failed to open input file");
exit(1);
}
break;
case 'h':
default:
print_usage(argv);
exit(1);
}
}
argc -= optind;
argv += optind;
if (argc != 0) {
print_usage(argv);
exit(1);
}
binary_to_text(file);
return 0;
}
