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

/* 17.11.2014 (Mayton) - added stuped startup. WTF? Pwd generator! Just for fun. */
/*                       TODO: Add capital Alpha, and Numeric support            */
/*                       TODO: Make marginal tests. Overflow. Plattform compatibility */


static char *buf;

int pa(char *a,int asize,int m,int M){
	if (m<M){
		int i;
		for(i=0;i<asize;i++){
			buf[m]=a[i];
			pa(a,asize,m + 1, M);
		}
	} else {
		buf[M]='\0';
		// TODO: Remove slowpok printf! Improove speed! 
		printf("%s\n",buf);
        }
}

int paLaunch(char *a,int m){
	pa(a,strlen(a),0,m);
}


// TODO: Support Unicde. Support National codepages.

char *alpha        = "abcdefghijklmnopqrstuvwxyz";

char *capitalAlpha = "ABCDEFGHIJLKMNOPQRSTUVWXWY";

char *num          = "0123456789";




int main(int argc,char **arg, char **env){
                                                                                                a
	if (argc==1) {
		fprintf(stderr,"\nPassword Generation 1.0 (c) Mayton and SQL.RU. Written in 'C' :)\n");
		fprintf(stderr,"Special thnx to: Sasha Mercury, Anatoly Moskovsky, Dima T.\n");
		fprintf(stderr,"\nUsage: pwdgen [m] \n\n");
		return -1;
	} else {
		int m = atoi(arg[1]);
		if (m>0){
			buf=malloc(22);
			paLaunch(alpha,m);
			free(buf);
			return 0;
		} else {
			fprintf(stderr,"\nArgument cannot be less than 0 or NaN!\n");
			return -2;
		}
		
	}

}                                                       

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

/* 17.11.2014 (Mayton) - added stuped startup. WTF? Pwd generator! Just for fun. */
/*                       TODO: Make marginal tests. Overflow. Plattform compatibility */
/* 18.11.2014 (Mayton) - added POSIX-like Character classes. Fixed some bugs. Improoved code design */
/*                       TODO: Add aility to Make multiple choose of charsets. Make charsets unique */
/*                       TODO: Add interval of length like m-n */


static char *buf;

static char *alphabet;

int pa(char *a,int asize,int m,int M){
	if (m<M){
		int i;
		for(i=0;i<asize;i++){
			buf[m]=a[i];
			pa(a,asize,m + 1, M);
		}
	} else {
		buf[M]='\0';
		puts(buf);
        }
}

int paLaunch(char *a,int m){
	pa(a,strlen(a),0,m);
}


char *alpha        = "abcdefghijklmnopqrstuvwxyz";

char *upper        = "ABCDEFGHIJLKMNOPQRSTUVWXWY";

char *xdigit       = "0123456789ABCDEF";

char *digit        = "0123456789";

char *punct        = "!@#$%^&*()-=_+,./?~`\\|";

// TODO: Make unique. For ex: ALPHA is union of LOWER and UPPER.

/*#define ALNUM 0x0
#define ALPHA 0x1
#define LOWER 0x2
#define PUNCT 0x3
#define UPPER 0x4
#define XDIGIT 0x5
#define DIGIT 0x6*/

int main(int argc,char **arg, char **env){
                                                                                                
	if (argc==1) {
		fprintf(stderr,"\nPassword Generation 1.1 (c) Mayton and SQL.RU. Written in 'C' :)\n");
		fprintf(stderr,"Special thnx to: Sasha Mercury, Anatoly Moskovsky, Dima T.\n");
		fprintf(stderr,"\nUsage: pwdgen [m] [options..] \n");
		fprintf(stderr,"\nWhere: options:\n");
		fprintf(stderr,"\n       alnum  - Alphanumeric characters [A..z] and [a..z] and [0..9]");
		fprintf(stderr,"\n       alpha  - Alphabetic characters [A..z] and [a..z]");
		fprintf(stderr,"\n       lower  - Lowercase alphabetic characters [a..z]");
		fprintf(stderr,"\n       punct  - Punctuation characters [,!?..]");
		fprintf(stderr,"\n       upper  - Uppercase alphabetic characters [A..Z]");
		fprintf(stderr,"\n       xdigit - Hexidecimal characters");
		fprintf(stderr,"\n       digit  - Numeric digits [0..9]");
		fprintf(stderr,"\n");
		return -1;
	} else {
		int m = 0;
		m = atoi(arg[1]);
		if (m > 0){ 
			if (argc==2) {
		        	buf = malloc(m + 1);
				paLaunch(alpha,m);
				free(buf);
				return 0;
                        } else {
				int optionDetect=0;
				alphabet = malloc(strlen(alpha)+strlen(upper)+strlen(xdigit)+strlen(digit)+strlen(punct)+1);
				alphabet[0]='\0';
				if (0==strcmp(arg[2],"lower")){
					strcat(alphabet,alpha);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"alnum")){
					strcat(alphabet,alpha);
					strcat(alphabet,upper);
					strcat(alphabet,digit);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"punct")){
					strcat(alphabet,punct);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"alpha")){
					strcat(alphabet,alpha);
					strcat(alphabet,upper);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"digit")){
					strcat(alphabet,digit);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"upper")){
					strcat(alphabet,upper);
					optionDetect=1;
				} else if (0==strcmp(arg[2],"xdigit")){
					strcat(alphabet,xdigit);
					optionDetect=1;
				}

				if (!optionDetect) {
					fprintf(stderr,"Unrecognized option!");
					return -3;
				}
		        	buf = malloc(m + 1);
				paLaunch(alphabet,m);
				free(buf);
				free(alphabet);
				return 0;
			}
		} else {
			fprintf(stderr,"\nArgument cannot be less than 0 or not a number!\n");
			return -2;
		}
		
	}

}