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/* This program produces an index file where the indexes
point to the text belonging to the keywords. This program
have to be executed after each update of the file LEARN
*/
#include "lie.h"
#define INDEXFIL "LEARN.ind"
#define LEARNFIL "LEARN"
#define KEYCHAR '@'
#define NEWLINE '\n'
#define BUFSIZE 2048
int main(void)
{ char indexfil[LABELLENGTH];
char learnfil[LABELLENGTH];
char buf[BUFSIZE+1];
char *bufpt=buf,*bufpt_newline=buf;
char key[KEYWORDLEN];
long number_chars_read;
int count=0;
long location_end=0,location_start=-1,file_adress=0;
FILE *indexpt,*learnpt;
learn_index_tp learn;
strcpy(indexfil,INDEXFIL); strcpy(learnfil,LEARNFIL);
learnpt=fopen(learnfil,readmode);
if (learnpt==NULL)
{ printf("File %s cannot be read.\n",learnfil); exit(1); }
indexpt=fopen(indexfil,writemode);
if (indexpt==NULL)
{ printf("File %s cannot be written.\n",indexfil); exit(1); }
printf("Starting indexing file '%s'.\n",indexfil);
while (!feof(learnpt)
&& fseek(learnpt,file_adress,0)>=0
&& (number_chars_read=fread(buf,sizeof(*buf),BUFSIZE,learnpt))!=0)
{ buf[number_chars_read]='\0'; location_start=-1;
while ((bufpt=strchr(bufpt,KEYCHAR))!=0 && bufpt_newline!=NULL)
{ location_end=bufpt-buf;
if (location_start>=0) /* skip the first time around */
{ strcpy(learn.keyword,key); learn.start=file_adress+location_start;
learn.size=location_end-location_start; ++count;
fwrite(&learn,sizeof(learn_index_tp),1,indexpt); /* write record */
}
/* Scan for new key. Pattern: ... \n */
if (bufpt!=NULL && (bufpt_newline=strchr(bufpt,NEWLINE))!=NULL)
{ location_start=bufpt_newline+1-buf; /* beginning of next line */
do --bufpt_newline; while (isspace(*bufpt_newline)); /* erases CR */
*++bufpt_newline='\0' ;
if (strlen(bufpt+1) >= KEYWORDLEN)
{ strncpy(key,bufpt+1,KEYWORDLEN-1); key[KEYWORDLEN-1]='\0';
printf("Key \"%s\" truncated\n to \"%s\".\n",bufpt+1,key);
}
else strcpy(key,bufpt+1);
bufpt=&buf[location_start];
}
}
file_adress=file_adress+location_end; bufpt_newline=bufpt=buf;
if (number_chars_read<BUFSIZE) break;
}
printf("End of indexing. Final key '%s'.\nWrote %d learn entries.\n"
,key,count);
return 0;
}
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