inverT/main.c

/**
	This program inverts the caracters in a
	given text file, using command line arguments
	or by prompting the question to the user.

	By Joni Silva, 27/05/2022.

*/

#include <main.h>


// Necessary to initalize my struct with all the info
struct parameters info = {
	.filename = "EMPTY",		// Here we store the file name
	.fd = NULL,					// File descriptor
	.version = "1.0",			// Software version
	.fileNameSize = 80,			// How many characters has the filename, including extention
// Below is the variable that holds the text to dislpay for help
	.help = "\n\
------------------------------------------------\n\
Usage: ./inverT -i [<some.text.file>]\n\
  -help      Print help and exit.\n\
  -v         Print application version and exit.\n\
  -i	     Invert text characters.\n\
Example: ./inverT -i test.txt\n",
};


int main (int argc, char *argv[])  {


	if (argc == 1) {								// If only one argument
		ask_file();									// Ask user for the file name and location
		invert_file();								// and invert the file content
	}

	else if (argc == 2) {							// If two arguments
		if (strncmp(argv[1], "-help", 5) == 0) {	// Check if the flag is '-help'
			printf("%s\n", info.help);				// and print help info
		}
		else if (strncmp(argv[1], "-v", 2) == 0) {	// Check if the flag is '-v'
			printf("Version %s\n", info.version);	// and print version info
		}
		else {										// Otherwise
			strcpy(info.filename, argv[1]);			// save the second argument into info.filename
			invert_file();							// and invert the file content
		}
	}

	else if (argc == 3) {							// If three arguments
		if(strncmp(argv[1], "-i", 2) == 0) {		// Check if the flag is '-i'
			strcpy(info.filename, argv[2]);			// save the third argument into info.filename
			invert_file();							// and invert the file content
		}
		else {										// Otherwise
			printf("\nInvalid flag!!!");			// print this
			printf("%s\n", info.help);				// and then print help info
		}
	}

	else {											// Otherwise if more then three arguments
		printf("\nTo many arguments!!!");			// print this
		printf("%s\n", info.help);					// and then print help info
	}

	return 0;
}