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/*
Tibdex - makes an inverted index for tib
a slight modification of Invert of bib
input: records of lines, separated by blank lines
output: key:file1 start/length ... start/length:file2 start/length ...
Note to non-unix users:
This program uses a unix command "sort" which sorts records in a file
"tmp_file" with the following sort key:
ASCII sort on the first field (fields are separated by spaces),
ASCII sort on the second field,
numeric sort on the third record,
numeric sort on the fourth record,
removing duplicates, and then writes to the same file. The use of "sort"
is isolated by the "#define SORT_IT" statement just below. If "sort"
is unavailable, replace the sort in the definition of "SORT_IT" by some
equivalent sort. If the format of "SORT_IT" is unacceptable, modify
appropriately the one place further below where "SORT_IT" is used.
It may not be necessary to remove duplicates.
*/
#define SORT_IT \
sprintf(sortcmd,"sort -u +0 -1 +1 -2 +2n -3 +3n %s -o %s",tmp_file,tmp_file);\
system(sortcmd);
#include "stdio.h"
#include "tib.h"
#define isnull(x) (*(x) == NULL)
#define makelow(c) ('A'<=(c) && (c)<='Z' ? (c)-'A'+'a' : c)
char headerline[240] = " ";/* header line -- list of files */
int max_kcnt = 100; /* max number of keys */
int max_klen = 6; /* max length of keys */
char *ignore = /* string of line starts to ignore */
"CNOPVcnopv\\\%";
char *common = COMFILE; /* name of file of common words */
char *INDEX = INDXFILE; /* name of output file */
char tmp_file[120]; /* name of temporary file */
char dirsp2[]=DIRSEP; /* directory separator character */
char optch2[]=OPTCH; /* option character on call */
int silent = 0; /* 0 => statistics printed */
/* 1 => no statisitics printed */
long int nextrecord(), recsize(), nextline();
char sortcmd[MAXSTR];
int argc;
char **argv;
main(argcount,arglist)
int argcount;
char **arglist;
{ char filename[MAXSTR], *pcom, *getenv(), *ptemp;
FILE *input, *output;
long int start,length;
char word[MAXSTR];
int kcnt;
char tag_line[MAXSTR];
char argchk[3];
long int records = 0; /* number of records read */
long int keys = 0; /* number of keys read (occurences) */
long int distinct; /* number of distinct keys */
long int shorten();
int i, strcmp();
/* header */
for (i = 1; i < argcount; i++) {
strcpy(argchk,OPTCH);
strcat(argchk,"z");
if (strcmp(arglist[i],argchk) == 0)
silent = true;
}
if (silent == false)
fprintf (stderr, "Tibdex -- version %s, released %s.\n", VERSION, RDATE);
/* get file names from environment */
pcom = getenv("COMFILE");
if (pcom != NULL)
strcpy(common,pcom);
ptemp = getenv("TMPDIR");
if (ptemp != NULL) {
strcpy(tmp_file,ptemp);
strcat(tmp_file,dirsp2);
strcat(tmp_file,"tibdXXXXXX");
}
else
strcpy(tmp_file,INVTEMPFILE);
argc= argcount-1;
argv= arglist+1;
mktemp(tmp_file);
output= fopen(tmp_file,"w");
if (output == NULL) {
fprintf(stderr, "tibdex: can't open temporary output file\n");
exit(1);
}
for ( flags() ; argc>0 ; argc--, argv++ ,flags() )
{ /* open input file */
strcpy(filename, *argv);
input = fopen(filename, "r");
if (input == NULL) {
strcat(filename, ".ref");
input=fopen(filename, "r");
if (input == NULL) {
fprintf(stderr, "can't open %s or %s\n", *argv, filename);
exit(1);
}
}
strcat(headerline, " ");
strcat(headerline, filename);
start= 0L;
length= 0L;
for(;;) /* each record */
{ /* find start of next record (exit if none) */
start= nextrecord(input,start+length);
if (start==EOF) break;
records++;
kcnt= 0;
length= recsize(input,start);
sprintf(tag_line, " %s %D %D\n", filename, start, length);
while (ftell(input) < start+length && kcnt < max_kcnt)
{ getword(input,word,ignore);
makekey(word,max_klen,common);
if (!isnull(word))
{ fputs(word,output); fputs(tag_line,output);
kcnt++; keys++;
}
}
}
fclose(input);
}
fclose(output);
SORT_IT
distinct = shorten(tmp_file,INDEX);
if( silent == 0 )
fprintf(stderr,
"%D documents %D distinct keys %D key occurrences\n",
records, distinct, keys);
}
/* Flag Meaning Default
-ki Keys per record 100
-li max Length of keys 6
-%str ignore lines that begin with %x CNOPVXcnopv
where x is in str
str is a seq of chars
-cfile file contains Common words /??????/common
do not use common words as keys
-pfile name of output file INDEX
-s do not print statistics statistics printed
*/
#define operand (strlen(*argv+2)==0 ? (argv++,argc--,*argv) : *argv+2)
flags()
{ for (; argc>0 && *argv[0]==optch2[0]; argc--,argv++)
{ switch ((*argv)[1])
{ case 'k': max_kcnt= atoi(operand);
break;
case 'l': max_klen= atoi(operand);
break;
case 'c': common= operand;
break;
case '%': ignore= *argv+2;
break;
case 'p': INDEX= operand;
break;
case 'z': silent= 1;
break;
default: fprintf(stderr, "unknown flag '%s'\n", *argv);
}
}
}
/* shorten(inf,outf): file "inf" consists of lines of the form:
key file start length
sorted by key and file. replace lines with the same key
with one line of the form:
key:file1 start/length ... start/length:file2 start/length ...
rename as file "outf"
returns number of lines in output
*/
long shorten(inf,outf)
char *inf, *outf;
{ FILE *in, *out;
char line[MAXSTR];
char key[MAXSTR], newkey[MAXSTR],
file[MAXSTR], newfile[MAXSTR];
long int start, length;
long int lines = 0;
strcpy(file,"");
strcpy(key,"");
in= fopen(inf, "r");
out= fopen(outf, "w");
if (in==NULL || out==NULL)
{ fprintf(stderr, "tibdex: error in opening file for compression\n");
return(1);
}
fputs(headerline,out);
fprintf(out, "\n");
getline(in,line);
sscanf(line,"%s%s%ld%ld", key, file, &start, &length);
fprintf(out, "%s :%s %D/%D", key, file, start, length);
for ( getline(in, line) ; !feof(in); getline(in, line))
{ sscanf(line,"%s%s%ld%ld", newkey, newfile, &start, &length);
if (strcmp(key,newkey)!=0)
{ strcpy(key, newkey);
strcpy(file, newfile);
fprintf(out, "\n%s :%s %D/%D", key, file, start, length);
lines++;
}
else if (strcmp(file,newfile)!=0)
{ strcpy(file,newfile);
fprintf(out, ":%s %D/%D", file, start, length);
}
else
fprintf(out, " %D/%D", start, length);
}
fprintf(out, "\n");
lines++;
fclose(in); fclose(out);
unlink(inf);
return (lines);
}
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