// void sigchld_handler(int s)
// {
// while(wait(NULL)>0);
// }
int main(void){
int sockfd,new_fd,try;
struct sockaddr_in my_addr;
struct sockaddr_in their_addr;
int sin_size;
struct sigaction sa;
char buf[BUFSIZE];
char buf1[BUFSIZE];
int yes=1;
printf("socket:");
scanf("%d",&try);
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
perror("socket");
exit(1);
}
getchar();
printf("bind:");
scanf("%d",&try);
getchar();
my_addr.sin_family=AF_INET;
my_addr.sin_port=htons(MYPORT);
// The inet_addr() function converts the Internet
// host address from the input from IPv4
// numbers-and-dots notation into binary data in
// network byte order
my_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
//This fills a part of memory with a constant byte
memset(&(my_addr.sin_zero),'\0',8);
if(bind(sockfd,(struct sockaddr *)&my_addr,
sizeof(struct sockaddr))==-1){
perror("bind");
exit(1);
}
printf("listen:");
scanf("%d",&try);
if(listen(sockfd,40)==-1){
perror("listen");
exit(1);
}
printf("accept:");
getchar();
sin_size=sizeof(struct sockaddr);
if((new_fd=accept(sockfd,(struct sockaddr *)&their_addr,&sin_size))==-1){
perror("accept");
exit(1);
}
//if(send(new_fd,"Hello, world!\n",1024,0)==-1)
// perror("send");
// while(1){
recv(new_fd, buf, 40, 0);
printf("%s\n",buf);
// }
strcpy(buf1,Strrev(buf));
printf("%s\n",buf1);
if(send(new_fd,buf1,40,0)==-1)
perror("send");
printf("close new_fd:");
scanf("%d",&try);
close(new_fd);
printf("close sockfd:");
scanf("%d",&try);
close(sockfd);
}
// return values:
// 0: failure
// 1: success, caller must add lemma to the end of the result string
// 2: success, caller must add lemma to the start of the result string
// 3: success, caller must not add lemma to the result string
static int lemmatiseer(const char * word,const char * wordend,const char * buf,const char * maxpos
#if TESTING
,char * start = NULL ,char * middle = NULL ,char * end = NULL
#endif
)
{
int pos = 0;
do // loop until matching pattern found
{
assert(pos >= 0);
assert(maxpos == buf+pos || *(int*)(buf+pos) >= 0);
buf += pos;
if(buf == maxpos)
{
pos = 0;
return 0;
}
else
pos = *(int*)buf; // pos now points to the next record, which has to be tried if the current record fails.
const char * p = buf + sizeof(int);
#if TESTING
int slen = strlen(start);
int mlen = strlen(middle);
int elen = strlen(end);
#endif
switch(*p)
{
case 1: // on success, subtree makes lhs of alternating pair
case 2: // on success, subtree makes rhs of alternating pair
{
if(oneAnswer)
{
if(*p == 1)
{
p += sizeof(int);
int hs = lemmatiseer(word,wordend,p,maxpos
#if TESTING
,start,middle,end
#endif
);
#if TESTING
start[slen] = 0;
middle[mlen] = 0;
end[elen] = 0;
#endif
return hs ? 3 : 0;
}
else
return 0;
}
p += sizeof(int);
int hs = lemmatiseer(word,wordend,p,maxpos
#if TESTING
,start,middle,end
#endif
);
#if TESTING
start[slen] = 0;
middle[mlen] = 0;
end[elen] = 0;
#endif
return hs ? *p : 0;
}
case 3: // on success, subtree makes both lhs and rhs of alternating pair
{
p += sizeof(int);
int altpos = *(int *)p;
int lhs = lemmatiseer(word,wordend,p + sizeof(int),p + altpos
#if TESTING
,start,middle,end
#endif
);
if(oneAnswer)
return lhs;
else
{
#if TESTING
start[slen] = 0;
middle[mlen] = 0;
Strrev(end);
end[elen] = 0;
Strrev(end);
#endif
int rhs = lemmatiseer(word,wordend,p + altpos,maxpos
#if TESTING
,start,middle,end
#endif
);
// Not sure whether following test is right.
// Is it possible that lhs and rhs both are > 0 but different?
//assert(lhs == rhs);
// it is possible that eg. lhs fails and rhs succeeds
if(lhs)
{
if(rhs)
return 3;
else
return 1;
}
else if(rhs)
return 2;
else
return 0;
}
}
default:
{
var vars[20];
const char * fields[44]; // 44 = (2*20 + 3) + 1
// The even numbered fields contain patterns
// The odd numbered fields contain replacements
// The first two fields (0,1) refer to the prefix
// The third and fourth (2,3) fields refer to the affix
// The remaining fields (4,5,..,..) refer to infixes, from left to right
// output=fields[1]+vars[0]+fields[5]+vars[1]+fields[7]+vars[2]+...+fields[2*n+3]+vars[n]+...+fields[3]
const char * wend = wordend;
fields[0] = p;
int findex = 1;
while(*p != '\n')
{
// putchar(*p);
if(*p == '\t')
fields[findex++] = ++p;
else
++p;
}
//putchar('\n');
fields[findex] = ++p;
// fields[findex] points to character after \n.
// When 1 is subtracted, it points to the character following the last replacement.
// p is now within 3 bytes from the first Record of the subtree
// printpat(fields,findex);
// check Lpat
vars[0].s = samestart(fields,word,wend);
if(vars[0].s)
{
// Lpat succeeded
vars[0].e = wend;
char * destination = NULL;
int printed = 0;
int subres = 0;
if(findex > 2) // there is more than just a prefix
{
const char * newend = sameend(fields,vars[0].s,wend);
if(newend)
wend = newend;
else
continue; //suffix didn't match
int k;
const char * w = vars[0].s;
int vindex = 0;
for(k = 4;k < findex;k += 2)
{
if(!substr(fields,k,w,wend,vars,vindex))
break;
++vindex;
w = vars[vindex].s;
}
if(k < findex)
continue;
vars[vindex].e = newend;
// Find first record of subtree, if there is any
long nxt = p - buf;
nxt += sizeof(int)-1;
nxt /= sizeof(int);
nxt *= sizeof(int);
#if TESTING
char _end[30];
if(start)
{
printpat2(fields,findex,start+strlen(start),middle,_end);
strcpy(_end+strlen(_end),end);
strcpy(end,_end);
}
#endif
const char * mmaxpos = pos ? buf + pos : maxpos;
const char * mbuf = buf + nxt;
assert(buf <= mmaxpos);
if( mbuf >= mmaxpos // There is no subtree
|| (subres = lemmatiseer(vars[0].s,wend,mbuf,mmaxpos // There is a subtree, but it has no matching records
#if TESTING
,start,middle,end
#endif
)
) < 3 // if subres IS 3, this rule must not fire.
)
{// length of prefix length of first unmatched length of suffix
int resultlength = (fields[2] - fields[1] - 1) + (vars[0].e - vars[0].s) + (fields[4] - fields[3] - 1);
#if TESTING
int replacementlength = (fields[2] - fields[1] - 1) + 1 + (fields[4] - fields[3] - 1);
#endif
int m;
for(m = 1;2*m+3 < findex;++m)
{
int M = 2*m+3;
// length of infix length of unmatched after infix
resultlength += (fields[M+1] - fields[M] - 1) + (vars[m].e - vars[m].s);
#if TESTING
replacementlength += (fields[M+1] - fields[M] - 1) + 1;
#endif
}
destination = new char[resultlength+1];
printed = sprintf(destination,"%.*s%.*s",fields[2] - fields[1] - 1,fields[1],vars[0].e - vars[0].s,vars[0].s);
#if TESTING
replacement = new char[replacementlength+1];
int printed2 = sprintf(replacement,"%.*s%.*s",fields[2] - fields[1] - 1,fields[1],1,"*");
#endif
for(m = 1;2*m+3 < findex;++m)
{
int M = 2*m+3;
printed += sprintf(destination+printed,"%.*s%.*s",fields[M+1] - fields[M] - 1,fields[M],vars[m].e - vars[m].s,vars[m].s);
#if TESTING
printed2 += sprintf(replacement+printed2,"%.*s%.*s",fields[M+1] - fields[M] - 1,fields[M],1,"*");
#endif
}
printed += sprintf(destination+printed,"%.*s",fields[4] - fields[3] - 1,fields[3]);
#if TESTING
sprintf(replacement+printed2,"%.*s",fields[4] - fields[3] - 1,fields[3]);
#endif
}
}
else if(vars[0].e == vars[0].s) // whole-word match: everything matched by "prefix"
{
subres = 0;
destination = new char[(fields[2] - fields[1] - 1)+1];
printed = sprintf(destination,"%.*s",fields[2] - fields[1] - 1,fields[1]);
#if TESTING
replacement = new char[(fields[2] - fields[1] - 1)+1];
sprintf(replacement,"%.*s",fields[2] - fields[1] - 1,fields[1]);
char _end[30];
if(start)
{
printpat2(fields,findex,start+strlen(start),middle,_end);
strcpy(_end+strlen(_end),end);
strcpy(end,_end);
}
#endif
}
else
continue; // something unmatched
if(destination)
{
#if TESTING
char temp[1000];
if(findex == 2)
sprintf(temp,"%s:%s%s%s->%s %d",destination,start,middle,end,replacement,findex);
else
sprintf(temp,"%s:%s%s*%s->%s %d",destination,start,middle,end,replacement,findex);
printf("%s\n",temp);
#endif
assert(subres < 3);
if(!result)
{
assert(subres == 0);
result = destination;
}
else // Check whether an alternative lemma was found
{
//assert(subres == 1 || subres == 2);
char * sub = strstr(result,destination);
if( !sub
|| ( sub != result
&& sub[-1] != ' '
)
|| ( sub[printed] != '\0'
&& sub[printed] != ' '
)
)
{ // Yes, lemma was not found already
char * newresult = new char[strlen(result)+printed+2];
if(subres == 1)
sprintf(newresult,"%s %s",result,destination);
else if(subres == 2)
sprintf(newresult,"%s %s",destination,result);
else
sprintf(newresult,"%s %s",result,destination);
delete [] result;
result = newresult;
}
delete [] destination;
}
}
return 3;
}
else
{
// Lpat failed
continue; // prefix failed
}
}
}
}
while(pos);
return 0;
}