p04_file_io.c

#include <stdio.h>
#include <string.h>

#ifndef __TRUE_FALSE__
#define __TRUE_FALSE__
#define TRUE 1
#define FALSE 0
#endif

#ifndef BUFFER_SIZE
#define BUFFER_SIZE 10000
#endif

#ifndef ASCII_UPPER_LOWER_OFFSET
#define ASCII_UPPER_LOWER_OFFSET 32
#endif

//from stackoverflow:
#ifndef LIST_CURR_DIR_CONTENTS
#ifdef WIN32
#define LIST_CURR_DIR_CONTENTS "dir /p"
#else
#define LIST_CURR_DIR_CONTENTS "ls -a | less"
#endif
#endif

// Prototypes
int ReadStringFromFile(char*, char*);
int WriteStringToFile(char*, char*);
int CleanString(char*);

// int main(int argc, const char *argv[])
// {
// 	char buffer[BUFFER_SIZE] = "";
// 
// 	ReadStringFromFile(INPUT_FILE, buffer);
// 	CleanString(buffer);
// 	WriteStringToFile(OUTPUT_FILE, buffer);
// 
// 	return 0;
// }

int ReadStringFromFile(char* path, char* string) {
	FILE *stream;
	int i;
	stream = NULL;
	stream = fopen(path, "r");
	if (stream == NULL) {
		fprintf(stderr, "ReadStringFromFile was unable to open and/or read from the file %s.\n", path);
		return FALSE;
	}
	for (i = 0; i < BUFFER_SIZE; i++) {
		if (((string[i] = getc(stream)) == EOF) || (string[i] == '\0')) {
			string[i] = '\0';
			fclose(stream);
			return TRUE;
		}
	}
	string[i-1] = '\0';
	fclose(stream);
	fprintf(stderr, "The input file size exceeded %i bytes, the maximum accepted\nfile size. Some of the input file may not be processed.\n", BUFFER_SIZE);
	return FALSE;
}

int WriteStringToFile(char* path, char* string) {
	FILE *stream;
	stream = NULL;
	stream = fopen(path, "w");
	if (stream == NULL) {
		fprintf(stderr, "WriteStringToFile was unable to open the file %s.\n", path);
		return FALSE;
	}
//	if (strlen(string) == 0) {
//		fprintf(stderr, "WriteStringToFile was passed an empty string. Nothing will be\nwritten to %s.", path);
//		return FALSE;
//	}
	if (fprintf(stream, "%s\n", string) == strlen(string) + 1) {
		fclose(stream);
		return TRUE;
	} else {
		fprintf(stderr, "The entire cleaned string was not written to the output file. Ensure that\nyou have adequate permissions to write/create a file and the target medium has\nsufficient space for this write (estimated to be %i bytes).\n", (int) strlen(string));
		return FALSE;
	}
}

int CleanString(char* string) {
	int i, k;
	k = 0;
	for (i = 0; i < BUFFER_SIZE; i++) {
		if (string[i] >= 97 && string[i] < 123) {
			string[k++] = string[i];
		} else if (string[i] >= 65 && string[i] < 91) {
			string[k++] = string[i] + ASCII_UPPER_LOWER_OFFSET;
		} else if (string[i] == '\0') {
			string[k] = '\0';
			return TRUE;
		}
	}
	fprintf(stderr, "CleanString scanned through %i bytes without finding a null character.\nThe input string should be terminated by a null character.", BUFFER_SIZE);
	return FALSE;
}