mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-15 23:49:37 +00:00
378 lines
8.7 KiB
C++
378 lines
8.7 KiB
C++
#include "COPYING"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits>
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#include <vector>
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#include "mythes.hxx"
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MyThes::MyThes(const char* idxpath, const char * datpath)
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{
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nw = 0;
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encoding = NULL;
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list = NULL;
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offst = NULL;
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pdfile = NULL;
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if (thInitialize(idxpath, datpath) != 1) {
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fprintf(stderr,"Error - can't open %s or %s\n",idxpath, datpath);
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fflush(stderr);
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thCleanup();
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// did not initialize properly - throw exception?
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}
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}
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MyThes::~MyThes()
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{
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thCleanup();
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}
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int MyThes::thInitialize(const char* idxpath, const char* datpath)
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{
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// open the index file
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FILE * pifile = fopen(idxpath,"r");
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if (!pifile) {
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return 0;
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}
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// parse in encoding and index size */
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std::vector<char> buffer(MAX_WD_LEN);
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char * wrd = &buffer[0];
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readLine(pifile,wrd,MAX_WD_LEN);
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encoding = mystrdup(wrd);
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readLine(pifile,wrd,MAX_WD_LEN);
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int idxsz = atoi(wrd);
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// spitz: fix -Wsign-compare warning
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if (idxsz <= 0 || static_cast<unsigned int>(idxsz) > std::numeric_limits<int>::max() / sizeof(char*)) {
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fprintf(stderr,"Error - bad index %d\n", idxsz);
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fclose(pifile);
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return 0;
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}
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// now allocate list, offst for the given size
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list = (char**) calloc(idxsz,sizeof(char*));
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offst = (unsigned int*) calloc(idxsz,sizeof(unsigned int));
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if ( (!(list)) || (!(offst)) ) {
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fprintf(stderr,"Error - bad memory allocation\n");
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fclose(pifile);
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return 0;
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}
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// now parse the remaining lines of the index
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int len = readLine(pifile,wrd,MAX_WD_LEN);
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while (len > 0)
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{
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int np = mystr_indexOfChar(wrd,'|');
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if (nw < idxsz) {
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if (np >= 0) {
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*(wrd+np) = '\0';
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list[nw] = (char *)calloc(1,(np+1));
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if (!list[nw]) {
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fprintf(stderr,"Error - bad memory allocation\n");
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fflush(stderr);
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fclose(pifile);
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return 0;
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}
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memcpy((list[nw]),wrd,np);
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offst[nw] = atoi(wrd+np+1);
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nw++;
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}
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}
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len = readLine(pifile,wrd,MAX_WD_LEN);
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}
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fclose(pifile);
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/* next open the data file */
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pdfile = fopen(datpath,"r");
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if (!pdfile) {
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return 0;
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}
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return 1;
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}
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void MyThes::thCleanup()
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{
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/* first close the data file */
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if (pdfile) {
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fclose(pdfile);
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pdfile=NULL;
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}
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if (list)
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{
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/* now free up all the allocated strings on the list */
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for (int i=0; i < nw; i++)
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{
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if (list[i]) {
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free(list[i]);
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list[i] = 0;
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}
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}
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free((void*)list);
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}
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if (encoding) free((void*)encoding);
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if (offst) free((void*)offst);
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encoding = NULL;
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list = NULL;
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offst = NULL;
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nw = 0;
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}
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// lookup text in index and count of meanings and a list of meaning entries
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// with each entry having a synonym count and pointer to an
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// array of char * (i.e the synonyms)
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//
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// note: calling routine should call CleanUpAfterLookup with the original
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// meaning point and count to properly deallocate memory
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int MyThes::Lookup(const char * pText, int len, mentry** pme)
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{
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*pme = NULL;
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// handle the case of missing file or file related errors
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if (! pdfile) return 0;
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long offset = 0;
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/* copy search word and make sure null terminated */
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std::vector<char> buffer(len+1);
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char * wrd = &buffer[0];
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memcpy(wrd,pText,len);
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/* find it in the list */
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int idx = nw > 0 ? binsearch(wrd,list,nw) : -1;
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if (idx < 0) return 0;
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// now seek to the offset
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offset = (long) offst[idx];
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int rc = fseek(pdfile,offset,SEEK_SET);
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if (rc) {
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return 0;
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}
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// grab the count of the number of meanings
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// and allocate a list of meaning entries
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char * buf = NULL;
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buf = (char *) malloc( MAX_LN_LEN );
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if (!buf) return 0;
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readLine(pdfile, buf, (MAX_LN_LEN-1));
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int np = mystr_indexOfChar(buf,'|');
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if (np < 0) {
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free(buf);
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return 0;
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}
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int nmeanings = atoi(buf+np+1);
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// spitz: fix -Wsign-compare warning
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if (nmeanings < 0 || static_cast<unsigned int>(nmeanings) > std::numeric_limits<int>::max() / sizeof(mentry))
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nmeanings = 0;
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*pme = (mentry*)(nmeanings ? malloc(nmeanings * sizeof(mentry)) : NULL);
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if (!(*pme)) {
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free(buf);
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return 0;
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}
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// now read in each meaning and parse it to get defn, count and synonym lists
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mentry* pm = *(pme);
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char dfn[MAX_WD_LEN];
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for (int j = 0; j < nmeanings; j++) {
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readLine(pdfile, buf, (MAX_LN_LEN-1));
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pm->count = 0;
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pm->psyns = NULL;
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pm->defn = NULL;
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// store away the part of speech for later use
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char * p = buf;
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char * pos = NULL;
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np = mystr_indexOfChar(p,'|');
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if (np >= 0) {
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*(buf+np) = '\0';
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pos = mystrdup(p);
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p = p + np + 1;
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} else {
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pos = mystrdup("");
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}
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// count the number of fields in the remaining line
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int nf = 1;
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char * d = p;
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np = mystr_indexOfChar(d,'|');
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while ( np >= 0 ) {
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nf++;
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d = d + np + 1;
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np = mystr_indexOfChar(d,'|');
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}
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pm->count = nf;
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pm->psyns = (char **) malloc(nf*sizeof(char*));
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// fill in the synonym list
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d = p;
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for (int jj = 0; jj < nf; jj++)
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{
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np = mystr_indexOfChar(d,'|');
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if (np > 0)
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{
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*(d+np) = '\0';
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pm->psyns[jj] = mystrdup(d);
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d = d + np + 1;
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}
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else
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{
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pm->psyns[jj] = mystrdup(d);
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}
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}
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// add pos to first synonym to create the definition
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if (pm->psyns[0])
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{
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int k = strlen(pos);
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int m = strlen(pm->psyns[0]);
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if ((k+m) < (MAX_WD_LEN - 1)) {
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strncpy(dfn,pos,k);
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*(dfn+k) = ' ';
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strncpy((dfn+k+1),(pm->psyns[0]),m+1);
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pm->defn = mystrdup(dfn);
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} else {
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pm->defn = mystrdup(pm->psyns[0]);
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}
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}
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free(pos);
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pm++;
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}
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free(buf);
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return nmeanings;
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}
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void MyThes::CleanUpAfterLookup(mentry ** pme, int nmeanings)
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{
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if (nmeanings == 0) return;
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if ((*pme) == NULL) return;
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mentry * pm = *pme;
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for (int i = 0; i < nmeanings; i++) {
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int count = pm->count;
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for (int j = 0; j < count; j++) {
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if (pm->psyns[j]) free(pm->psyns[j]);
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pm->psyns[j] = NULL;
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}
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if (pm->psyns) free(pm->psyns);
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pm->psyns = NULL;
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if (pm->defn) free(pm->defn);
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pm->defn = NULL;
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pm->count = 0;
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pm++;
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}
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pm = *pme;
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free(pm);
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*pme = NULL;
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return;
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}
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// read a line of text from a text file stripping
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// off the line terminator and replacing it with
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// a null string terminator.
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// returns: -1 on error or the number of characters in
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// in the returning string
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// A maximum of nc characters will be returned
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int MyThes::readLine(FILE * pf, char * buf, int nc)
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{
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if (fgets(buf,nc,pf)) {
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mychomp(buf);
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return strlen(buf);
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}
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return -1;
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}
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// performs a binary search on null terminated character
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// strings
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//
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// returns: -1 on not found
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// index of wrd in the list[]
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int MyThes::binsearch(char * sw, char* _list[], int nlst)
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{
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int lp, up, mp, j, indx;
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lp = 0;
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up = nlst-1;
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indx = -1;
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if (strcmp(sw,_list[lp]) < 0) return -1;
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if (strcmp(sw,_list[up]) > 0) return -1;
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while (indx < 0 ) {
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mp = (int)((lp+up) >> 1);
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j = strcmp(sw,_list[mp]);
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if ( j > 0) {
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lp = mp + 1;
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} else if (j < 0 ) {
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up = mp - 1;
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} else {
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indx = mp;
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}
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if (lp > up) return -1;
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}
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return indx;
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}
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char * MyThes::get_th_encoding()
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{
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return encoding;
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}
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// string duplication routine
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char * MyThes::mystrdup(const char * s)
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{
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char * d = NULL;
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if (s) {
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int sl = strlen(s)+1;
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d = (char *) malloc(sl);
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if (d) memcpy(d,s,sl);
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}
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return d;
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}
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// remove cross-platform text line end characters
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void MyThes::mychomp(char * s)
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{
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int k = strlen(s);
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if ((k > 0) && ((*(s+k-1)=='\r') || (*(s+k-1)=='\n'))) *(s+k-1) = '\0';
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if ((k > 1) && (*(s+k-2) == '\r')) *(s+k-2) = '\0';
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}
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// return index of char in string
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int MyThes::mystr_indexOfChar(const char * d, int c)
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{
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char * p = strchr((char *)d,c);
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if (p) return (int)(p-d);
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return -1;
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}
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