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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="393.htm">上一层</a>][<a href="405.htm">下一篇</a>]
<hr><p align="left"><small>发信人: ipxodi (乐乐~大地飞鹰), 信区: Hacker <br>
标 题: 密码生成器源程序 <br>
发信站: BBS 水木清华站 (Fri Dec 17 19:35:29 1999) <br>
#include <stdio.h> <br>
<br>
#include <stdlib.h> <br>
<br>
#include <ctype.h> <br>
<br>
#include <string.h> <br>
<br>
<br>
<br>
char charSet[8][256];//store all the charset <br>
<br>
int rulePtr ; <br>
<br>
char rule[256]= "\"ab[]\"[0-9][a-d]"; <br>
<br>
<br>
<br>
void init() <br>
<br>
<br>
{ <br>
<br>
write(2,"please input the rules:",26); <br>
<br>
scanf("%s",rule); <br>
<br>
} <br>
<br>
char splashtoAscii() <br>
<br>
{ <br>
<br>
char ch=0; <br>
<br>
rulePtr++; <br>
<br>
switch(rule[rulePtr]) { <br>
<br>
case 't':ch = '\t';break; <br>
<br>
case 'n':ch = '\n';break; <br>
<br>
<br>
case 'v':ch = '\v';break; <br>
<br>
case 'b':ch = '\b';break; <br>
<br>
case 'r':ch = '\r';break; <br>
<br>
case 'f':ch = '\f';break; <br>
<br>
case '\\':ch = '\\';break; <br>
<br>
case '\'': ch = '\'';break; <br>
<br>
default: <br>
<br>
if(isdigit(rule[rulePtr])) { <br>
<br>
ch = atoi(rule+rulePtr); <br>
<br>
for(;isdigit(rule[rulePtr]); rulePtr++ ); <br>
<br>
break; <br>
<br>
<br>
}else break; <br>
<br>
} <br>
<br>
return ch; <br>
<br>
} <br>
<br>
<br>
<br>
char getChar() <br>
<br>
{ <br>
<br>
char ch = rule[rulePtr]; <br>
<br>
switch(ch) { <br>
<br>
case '\\': <br>
<br>
return splashtoAscii(); <br>
<br>
<br>
case '[':case ']':case '-': <br>
<br>
printf("sorry, syntax error!\n"); <br>
<br>
return 0; <br>
<br>
default: <br>
<br>
rulePtr++; <br>
<br>
return ch; <br>
<br>
} <br>
<br>
} <br>
<br>
<br>
<br>
void dealBracket(int &bit)//'[]' <br>
<br>
{ <br>
<br>
<br>
rulePtr++;//rule[rulePtr] = '['; <br>
<br>
int charLocate=0; <br>
<br>
for(;rule[rulePtr];) { <br>
<br>
switch(rule[rulePtr]) { <br>
<br>
case '-': <br>
<br>
charLocate--; <br>
<br>
rulePtr ++; <br>
<br>
char start = charSet[bit][charLocate],end = get <br>
<br>
for(;start<=end;start++)charSet[bit][charLocate <br>
<br>
break; <br>
<br>
case '\\': <br>
<br>
<br>
default: <br>
<br>
charSet[bit][charLocate++] = getChar();//把这个 <br>
<br>
break; <br>
<br>
} <br>
<br>
if(rule[rulePtr]==']') { rulePtr++;break; } <br>
<br>
} <br>
<br>
bit++; <br>
<br>
} <br>
<br>
void dealString(int &bit) <br>
<br>
{ <br>
<br>
rulePtr ++;//skip the " <br>
<br>
<br>
for(;bit<8&&rule[rulePtr]&&rule[rulePtr]!='"';bit++) charSet[bit][0] <br>
<br>
} <br>
<br>
void dealIn(char * rule) <br>
<br>
{ <br>
<br>
int bit=0; <br>
<br>
for(rulePtr=0;rule[rulePtr];) { <br>
<br>
switch(rule[rulePtr]) { <br>
<br>
case '"': <br>
rulePtr ++;//skip the " <br>
for(;;bit++) { <br>
if(bit>=8) return; <br>
if(!rule[rulePtr]) return; <br>
if(rule[rulePtr]=='"') {rulePtr++;break;} <br>
charSet[bit][0] = rule[rulePtr++]; <br>
} <br>
break; <br>
case '\\':getChar();bit++;break; <br>
case '[':dealBracket(bit);break; <br>
default: printf("sorry, syntax error!\n");break; <br>
} <br>
if(bit>=8) break; <br>
} <br>
} <br>
void genCode(char *buff,int level) <br>
{ <br>
if(level>=8||charSet[level][0]==0) { <br>
buff[level]=0; <br>
printf("%s\n",buff); <br>
return; <br>
} <br>
for( int i=0;charSet[level][i]&&i<256;i++) { <br>
buff[level] = charSet[level][i]; <br>
genCode(buff,level+1); <br>
} <br>
} <br>
<br>
int main() <br>
{ <br>
char word[10]; <br>
memset(charSet,'\0',8*256); <br>
init(); <br>
dealIn(rule); <br>
genCode(word,0);//use charset <br>
return 1; <br>
} <br>
<br>
-- <br>
</small><hr>
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