th/sorting.c

#include <curses.h>
#include <dirent.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>

#include "defines.h"

extern time_t *seed;

int skip_hidden_files(const struct dirent *entry){

	if (entry->d_name[0] == '.') {
		return 0;
	}
	return 1;
}
int skip_dot(const struct dirent *entry){

	if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
		return 0;
	}
	return 1;
}

int sort_natural(const void *file0, const void *file1){

	if ((((file*)file0)->file_type & FILE_TYPE_DIR) && !(((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return -1;
	}
	if (!(((file*)file0)->file_type & FILE_TYPE_DIR) && (((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return 1;
	}
	const unsigned char *a = (unsigned char*)((file*)file0)->file_name;
	const unsigned char *b = (unsigned char*)((file*)file1)->file_name;

	long parsed_number0 = 0;
	long parsed_number1 = 0;
	char is_num = 0;
	char result = 0;

	do {

		if ((*a <= '9') && (*a >= '0')) {
			parsed_number0 = 0;
			do {
				parsed_number0 = (parsed_number0 * 10) + (*a - '0');
				a++;
			} while((*a <= '9') && (*a >= '0'));
			is_num |= 1;
		}
		if ((*b <= '9') && (*b >= '0')) {
			parsed_number1 = 0;
			do {
				parsed_number1 = (parsed_number1 * 10) + (*b - '0');
				b++;
			} while((*b <= '9') && (*b >= '0'));
			is_num |= 2;
		}

		if (is_num) {
			if (is_num == 1) {
				if (*b > '9') {
					result = -1;
				} else {
					result = 1;
				}
				break;
			} else if (is_num == 2) {
				if (*a > '9') {
					result = 1;
				} else {
					result = -1;
				}
				break;
			} else {
				if (parsed_number0 > parsed_number1) {
					result = 1;
					break;
				} else if (parsed_number0 < parsed_number1) {
					result = -1;
					break;
				}
			}
			/* those breaks are not set here, due to the possibillity that both numbers are equal
			 * in which case the comparison should continue */
			is_num = 0;
		}

		unsigned char aa = ((*a >= 'A') && (*a <= 'Z')) ? (*a | ' ') : *a;
		unsigned char bb = ((*b >= 'A') && (*b <= 'Z')) ? (*b | ' ') : *b;
		/*using a simple aa - bb would occasionaly cause underflows with wide chars*/
		result = ((aa == bb) ? 0 : ((aa > bb) ? 1 : -1 ));
		a++;
		b++;
	} while (result == 0);

	return result;
}
int sort_alpha(const void *file0, const void *file1){

	if ((((file*)file0)->file_type & FILE_TYPE_DIR) && !(((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return -1;
	}
	if (!(((file*)file0)->file_type & FILE_TYPE_DIR) && (((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return 1;
	}

	return strcmp(((file*)file0)->file_name, ((file*)file1)->file_name);
}
int sort_random(const void *file0, const void *file1){

	if ((((file*)file0)->file_type & FILE_TYPE_DIR) && !(((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return -1;
	}
	if (!(((file*)file0)->file_type & FILE_TYPE_DIR) && (((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return 1;
	}
	time_t num = (time_t)&seed;
	unsigned long i;
	for (i = 0; i < 6; i++){
		num ^= *seed;
		if (num%2) {
			num ^= (time_t)&num;
			num ^= num << i;
		} else {
			num ^= (time_t)&seed;
			num ^= num >> i;
		}
	}
	num ^= getpid();

	return ((num%3) - 1);

}
int sort_type(const void *file0, const void *file1){

	if ((((file*)file0)->file_type & FILE_TYPE_DIR) && !(((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return -1;
	}
	if (!(((file*)file0)->file_type & FILE_TYPE_DIR) && (((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return 1;
	}

	if (((file*)file0)->file_type == ((file*)file1)->file_type) {
		/*somehow relying on the else below, occasionaly trips either one of the checked for conditions*/
		return strcasecmp(((file*)file0)->file_name, ((file*)file1)->file_name);
	} else if (((file*)file0)->file_type > ((file*)file1)->file_type) {
		return -1;
	} 	
	return 1;
}
int sort_size(const void *file0, const void *file1){

	if ((((file*)file0)->file_type & FILE_TYPE_DIR) && !(((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return -1;
	}
	if (!(((file*)file0)->file_type & FILE_TYPE_DIR) && (((file*)file1)->file_type & FILE_TYPE_DIR)) {
			return 1;
	}

	if (((file*)file0)->file_size == ((file*)file1)->file_size) {
		return strcasecmp(((file*)file0)->file_name, ((file*)file1)->file_name);
	} else if (((file*)file0)->file_size > ((file*)file1)->file_size) {
		return -1;
	} 
	return 1;
}