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libspell.c
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libspell.c
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/*-
* Copyright (c) 2017 Abhinav Upadhyay <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <err.h>
#include <math.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
//#include <bsd/util.h>
#include <unistd.h>
//#include <util.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "libspell.h"
#include "trie.h"
typedef struct set {
char *a;
char *b;
} set;
typedef struct next {
char pri[2];
char sec[2];
size_t offset;
} next;
/*
* Converts a word to lower case
*/
char *
lower(char *str)
{
int i = 0;
char c;
while (str[i] != '\0') {
c = tolower((unsigned char) str[i]);
str[i++] = c;
}
return str;
}
static int
min(int i, int j, int k)
{
int min = i;
if (min > j)
min = j;
if (min > k)
min = k;
return min;
}
static void
append_word_list(word_list *l1, word_list *l2)
{
word_list *last = l1;
if (l1 == NULL) {
l1 = l2;
return;
}
while (last->next != NULL)
last = last->next;
last->next = l2;
}
static char **
concat_lists(char **l1, char **l2)
{
if (l1 == NULL && l2 == NULL)
return NULL;
size_t new_len = 0;
size_t i = 0;
size_t index = 0;
if (l1 != NULL)
while (l1[i] != 0) {
new_len++;
i++;
}
i = 0;
if (l2 != NULL)
while(l2[i] != 0) {
new_len++;
i++;
}
char **ret = malloc(sizeof(*ret) * (new_len + 1));
i = 0;
if (l1 != NULL)
while (l1[i] != 0)
ret[index++] = strdup(l1[i++]);
i = 0;
if (l2 != NULL)
while (l2[i] != 0)
ret[index++] = strdup(l2[i++]);
ret[index] = NULL;
return ret;
}
static int
edit_distance(const char *s1, const char *s2)
{
size_t i, j;
size_t len1 = strlen(s1);
size_t len2 = strlen(s2);
int m[len1 + 1][len2 + 1];
for (i = 0; i < len1; i++)
for(j = 0; j < len2; j++)
m[i][j] = 0;
for (i = 1; i <= len1; i++)
m[i][0] = i;
for (j = 1; j <= len2; j++)
m[0][j] = j;
for (i = 1; i <= len1; i++)
for (j = 1; j <= len2; j++)
if (s1[i - 1] == s2[j - 1])
m[i][j] = m[i - 1][j - 1];
else
m[i][j] = min(m[i - 1][j - 1] + 1,
m[i - 1][j] + 1,
m[i][j - 1] + 1);
return m[len1][len2];
}
void
free_word_list(word_list *list)
{
if (list == NULL)
return;
word_list *nodep = list;
word_list *temp;
while (nodep != NULL) {
free(nodep->word);
temp = nodep->next;
free(nodep);
nodep = temp;
}
}
static void
add_candidate_node(char *candidate, word_list **candidates, word_list **tail, float weight)
{
if (*candidates == NULL) {
*candidates = malloc(sizeof(**candidates));
(*candidates)->next = NULL;
(*candidates)->word = candidate;
(*candidates)->weight = weight;
*tail = *candidates;
} else {
word_list *node = malloc(sizeof(*node));
node->word = candidate;
node->next = NULL;
node->weight = weight;
(*tail)->next = node;
*tail = node;
}
}
/*
* edits1--
* edits1 generates all permutations of the characters of a
* given word at maximum edit distance of 1.
*
* All details are in the article mentioned at the top. But basically it generates 4
* types of possible arrangements of the chracters of a given word, stores them in an array and
* at the end returns that array to the caller. The 4 different arrangements
* are: (n = strlen(word) in the following description)
* 1. Deletes: Delete one character at a time: n possible words
* 2. Trasnposes: Change positions of two adjacent characters: n -1 possible words
* 3. Replaces: Replace each character by one of the 26 alphabetes in English:
* 26 * n possible words
* 4. Inserts: Insert an alphabet at each of the character positions (one at a
* time. 26 * (n + 1) possible words.
*
* This implementation is Based on the edit distance or Levenshtein distance technique.
* Explained by Peter Norvig in his post here: http://norvig.com/spell-correct.html
*/
static word_list *
edits1(char *word, size_t distance)
{
size_t i, j, len_a, len_b;
char alphabet;
size_t wordlen = strlen(word);
if (wordlen < 1)
return NULL;
size_t counter = 0;
set splits[wordlen + 1];
word_list *candidates = NULL;
word_list *tail = NULL;
char *word_soundex = double_metaphone(word);
char *candidate_soundex;
const char alphabets[] = "abcdefghijklmnopqrstuvwxyz- ";
/* Start by generating a split up of the characters in the word */
for (i = 0; i < wordlen + 1; i++) {
splits[i].a = (char *) malloc(i + 1);
splits[i].b = (char *) malloc(wordlen - i + 1);
memcpy(splits[i].a, word, i);
memcpy(splits[i].b, word + i, wordlen - i + 1);
splits[i].a[i] = 0;
}
/* Now generate all the permutations at maximum edit distance of 1.
* counter keeps track of the current index position in the array
* candidates where the next permutation needs to be stored. */
for (i = 0; i < wordlen + 1; i++) {
len_a = strlen(splits[i].a);
len_b = strlen(splits[i].b);
assert(len_a + len_b == wordlen);
/* Deletes */
if (wordlen > 1 && i < wordlen) {
char *candidate = malloc(wordlen);
memcpy(candidate, splits[i].a, len_a);
if (len_b - 1 > 0)
memcpy(candidate + len_a, splits[i].b + 1, len_b - 1);
candidate[wordlen - 1] = 0;
float weight = 1.0 / distance;
if (i == 0)
weight /= 1000;
weight /= 10;
candidate_soundex = double_metaphone(candidate);
if (word_soundex && candidate_soundex && strcmp(candidate_soundex, word_soundex) == 0)
weight *= 20;
free(candidate_soundex);
add_candidate_node(candidate, &candidates, &tail, weight);
}
/* Transposes */
if (i < wordlen - 1 && len_b >= 2 && splits[i].b[0] != splits[i].b[1]) {
char *candidate = malloc(wordlen + 1);
memcpy(candidate, splits[i].a, len_a);
candidate[len_a] = splits[i].b[1];
candidate[len_a + 1] = splits[i].b[0];
memcpy(candidate + len_a + 2, splits[i].b + 2, len_b - 2);
candidate[wordlen] = 0;
float weight = 1.0 / distance;
if (i == 0)
weight /= 1000;
candidate_soundex = double_metaphone(candidate);
if (word_soundex && candidate_soundex && strcmp(candidate_soundex, word_soundex) == 0)
weight *= 20;
free(candidate_soundex);
add_candidate_node(candidate, &candidates, &tail, weight);
}
/* For replaces and inserts, run a loop from 'a' to 'z' */
for (j = 0; j < sizeof(alphabets) - 1; j++) {
alphabet = alphabets[j];
float weight = 1.0 / distance;
/* Replaces */
if (i < wordlen && splits[i].b[0] != alphabet) {
char *candidate = malloc(wordlen + 1);
memcpy(candidate, splits[i].a, len_a);
candidate[len_a] = alphabet;
if (len_b - 1 >= 1)
memcpy(candidate + len_a + 1, splits[i].b + 1, len_b - 1);
candidate[wordlen] = 0;
weight = 1.0 / distance;
if (i == 0)
weight /= 1000;
candidate_soundex = double_metaphone(candidate);
if (word_soundex && candidate_soundex && strcmp(candidate_soundex, word_soundex) == 0)
weight *= 20;
weight /= 10;
free(candidate_soundex);
add_candidate_node(candidate, &candidates, &tail, weight);
}
/* Inserts */
char *candidate = malloc(wordlen + 2);
memcpy(candidate, splits[i].a, len_a);
candidate[len_a] = alphabet;
if (len_b >= 1)
memcpy(candidate + len_a + 1, splits[i].b, len_b);
candidate[wordlen + 1] = 0;
weight = 1.0 / distance;
if (i == 0)
weight /= 1000;
weight *= 10;
candidate_soundex = double_metaphone(candidate);
if (word_soundex && candidate_soundex && strcmp(candidate_soundex, word_soundex) == 0)
weight *= 20;
free(candidate_soundex);
add_candidate_node(candidate, &candidates, &tail, weight);
}
}
for (i = 0; i < wordlen + 1; i++) {
free(splits[i].a);
free(splits[i].b);
}
free(word_soundex);
return candidates;
}
/*
* Returns a list of words at an edit distance +1 than the words
* in the list passed through the parameter edits1_list
*/
static word_list *
edits_plus_one(word_list *edits1_list)
{
word_list *nodep = edits1_list;
word_list *edits2_list = NULL;
word_list *tail = edits1_list;
word_list *templist;
if (edits1_list == NULL)
return NULL;
while (nodep->next != NULL) {
templist = edits1(nodep->word, 2);
nodep = nodep->next;
if (templist == NULL)
continue;
if (edits2_list == NULL) {
edits2_list = templist;
tail = edits2_list;
} else
tail->next = templist;
while (tail->next != NULL)
tail = tail->next;
}
return edits2_list;
}
static int
max_count(const void *node1, const void *node2)
{
word_list *wc1 = (word_list *) node1;
word_list *wc2 = (word_list *) node2;
if (wc1->weight == wc2->weight)
return 0;
return wc1->weight > wc2->weight ? -1: 1;
}
static word_list*
spell_get_corrections(spell_t *spell, word_list *candidate_list, size_t n, char *word)
{
size_t i = 0, corrections_count = 0;
size_t corrections_size = 16;
word_list *nodep = candidate_list;
float weight;
word_list *ret = NULL;
if (candidate_list == NULL)
return NULL;
char *metaphone_word = double_metaphone(word);
word_list *wl_array = malloc(corrections_size * sizeof(*wl_array));
while (nodep->next != NULL) {
char *candidate = nodep->word;
weight = nodep->weight;
nodep = nodep->next;
word_list listnode;
//char *front = look(candidate, spell->dictionary->front, spell->dictionary->back);
//size_t count = (size_t) (front != NULL? get_count(front, '\t'): 0);
size_t count = trie_get(spell->dictionary, candidate);
if (count == 0)
continue;
listnode.weight = count * weight;
listnode.word = (candidate);
size_t distance = edit_distance(candidate, word);
if (distance > 6)
continue;
char *metaphone_candidate = double_metaphone(candidate);
size_t meta_distance = edit_distance(metaphone_candidate, metaphone_word);
free(metaphone_candidate);
listnode.weight /= (pow(10,distance)) ;
listnode.weight /= (pow(10, meta_distance));
wl_array[corrections_count++] = listnode;
if (corrections_count == corrections_size - 1) {
corrections_size *= 2;
wl_array = realloc(wl_array, corrections_size * sizeof(*wl_array));
}
}
free(metaphone_word);
if (corrections_count == 0) {
free(wl_array);
return NULL;
}
size_t arraysize = n < corrections_count? n: corrections_count;
// char **corrections = malloc((arraysize + 1) * sizeof(*corrections));
// corrections[arraysize] = NULL;
qsort(wl_array, corrections_count, sizeof(*wl_array), max_count);
/*( for (i = 0; i < arraysize; i++) {
if (wl_array[i].word) {
corrections[i] = strdup(wl_array[i].word);
//printf("%s %f\n", wl_array[i].word, wl_array[i].weight);
}
}
free(wl_array);
return corrections;*/
word_list *node;
word_list *prevnode = NULL;
for (i = 0; i < arraysize ; i++) {
node = malloc(sizeof(*node));
node->word = strdup(wl_array[i].word);
node->next = NULL;
if (prevnode != NULL)
prevnode->next = node;
if (ret == NULL)
ret = node;
prevnode = node;
}
free(wl_array);
return ret;
}
void
free_list(char **list)
{
size_t i = 0;
if (list == NULL)
return;
while (list[i] != NULL)
free(list[i++]);
free(list);
}
static int
compare_listnodes(void *context, const void *node1, const void *node2)
{
const word_list *wl1 = (const word_list *) node1;
const word_list *wl2 = (const word_list *) node2;
return strcmp(wl1->word, wl2->word);
}
static int
parse_file_and_generate_trie(FILE * f, trie_t * tree, char field_separator)
{
if (f == NULL)
return -1;
char *line = NULL;
size_t count;
size_t linesize = 0;
size_t wordsize = 0;
ssize_t bytes_read;
word_count *wcnode;
word_count wc;
wc.count = 0;
while ((bytes_read = getline(&line, &linesize, f)) != -1) {
line[bytes_read - 1] = 0;
char *templine = line;
if (field_separator) {
char *sepindex = strchr(templine, field_separator);
if (sepindex == NULL) {
free(line);
return -1;
}
sepindex[0] = 0;
count = strtol(sepindex + 1, NULL, 10);
} else
/* Since our trie expects to store a count of the
* frequency of the word and for some cases (such as
* the whitelist word file) we don't have those
* counts, set the default count as 1
*/
count = 1;
lower(templine);
trie_insert(&tree, templine, count);
free(line);
line = NULL;
}
free(line);
return 0;
}
static int
parse_file_and_generate_tree(FILE *f, rb_tree_t *tree, char field_separator)
{
if (f == NULL)
return -1;
char *word = NULL;
char *line = NULL;
long count;
size_t linesize = 0;
size_t wordsize = 0;
ssize_t bytes_read;
word_count *wcnode;
word_count wc;
wc.count = 0;
while ((bytes_read = getline(&line, &linesize, f)) != -1) {
line[bytes_read - 1] = 0;
char *templine = line;
if (field_separator) {
char *sepindex = strchr(templine, field_separator);
if (sepindex == NULL) {
free(line);
return -1;
}
sepindex[0] = 0;
count = strtol(sepindex + 1, NULL, 10);
} else
count = 1;
word = strdup(templine);
lower(word);
wcnode = malloc(sizeof(*wcnode));
wcnode->word = word;
wcnode->count = count;
rb_tree_insert_node(tree, wcnode);
free(line);
line = NULL;
}
free(line);
return 0;
}
static wlist *
get_wlist(const char *fname)
{
struct stat sb;
int fd = open(fname, 'r');
if (fd == -1)
err(EXIT_FAILURE, "Failed to open %s", fname);
fstat(fd, &sb);
char *front = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (front == NULL)
err(EXIT_FAILURE, "mmap failed for %s", fname);
char *back = front + sb.st_size;
wlist *w = malloc(sizeof(wlist));
if (w == NULL)
err(EXIT_FAILURE, "malloc failed");
w->front = front;
w->back = back;
w->len = sb.st_size;
close(fd);
return w;
}
int
load_bigrams(spell_t *spellt, const char *bigram_path)
{
FILE *f;
rb_tree_t *ngrams_tree;
static const rb_tree_ops_t tree_ops = {
.rbto_compare_nodes = compare_words,
.rbto_compare_key = compare_words,
.rbto_node_offset = offsetof(word_count, rbtree),
.rbto_context = NULL
};
if ((f = fopen(bigram_path, "r")) != NULL) {
ngrams_tree = malloc(sizeof(*ngrams_tree));
rb_tree_init(ngrams_tree, &tree_ops);
spellt->ngrams_tree = ngrams_tree;
if ((parse_file_and_generate_tree(f, ngrams_tree, '\t')) < 0) {
spell_destroy(spellt);
fclose(f);
return -1;
}
fclose(f);
}
}
static int
generate_trie_from_list(word_list *list, trie_t *trie, char field_separator)
{
char *line = NULL;
size_t count;
size_t linesize = 0;
size_t wordsize = 0;
ssize_t bytes_read;
word_count *wcnode;
word_count wc;
wc.count = 0;
word_list *node = list;
while (node != NULL) {
line = node->word;
char *templine = line;
if (field_separator) {
char *sepindex = strchr(templine, field_separator);
if (sepindex == NULL) {
warnx("No tab found on line %s", templine);
return -1;
}
sepindex[0] = 0;
count = strtol(sepindex + 1, NULL, 10);
} else {
/* Since our trie expects to store a count of the
* frequency of the word and for some cases (such as
* the whitelist word file) we don't have those
* counts, set the default count as 1
*/
count = 1;
}
lower(templine);
trie_insert(&trie, templine, count);
node = node->next;
}
return 0;
}
spell_t *
spell_init2(word_list *dictionary_list, word_list *whitelist)
{
spell_t *spellt;
trie_t *words_tree = NULL;
static rb_tree_t *soundex_tree;
spellt = malloc(sizeof(*spellt));
words_tree = trie_init();
spellt->dictionary = words_tree;
spellt->ngrams_tree = NULL;
spellt->soundex_tree = NULL;
char *word = NULL;
char *line = NULL;
size_t linesize = 0;
size_t wordsize = 0;
ssize_t bytes_read;
word_count *wcnode;
word_count wc;
wc.count = 0;
if (whitelist != NULL) {
if ((generate_trie_from_list(whitelist, words_tree, 0)) < 0) {
spell_destroy(spellt);
return NULL;
}
}
if ((generate_trie_from_list(dictionary_list, words_tree, '\t')) < 0) {
spell_destroy(spellt);
return NULL;
}
word_list *node = dictionary_list;
static const rb_tree_ops_t soundex_tree_ops = {
.rbto_compare_nodes = compare_listnodes,
.rbto_compare_key = compare_listnodes,
.rbto_node_offset = offsetof(word_list, rbtree),
.rbto_context = NULL
};
soundex_tree = malloc(sizeof(*soundex_tree));
rb_tree_init(soundex_tree, &soundex_tree_ops);
spellt->soundex_tree = soundex_tree;
while(node != NULL) {
char *word= node->word;
char *soundex_code = double_metaphone(word);
word_list *listnode;
word_list templistnode;
templistnode.word = soundex_code;
listnode = rb_tree_find_node(soundex_tree, &templistnode);
if (listnode != NULL) {
word_list *newlistnode = malloc(sizeof(*newlistnode));
newlistnode->word = strdup(word);
newlistnode->next = listnode->next;
newlistnode->weight = .01;
listnode->next = newlistnode;
} else {
listnode = malloc(sizeof(*listnode));
listnode->word = strdup(soundex_code);
word_list *newlistnode = malloc(sizeof(*newlistnode));
newlistnode->word = strdup(word);
newlistnode->next = NULL;
newlistnode->weight = .01;
listnode->next= newlistnode;
rb_tree_insert_node(soundex_tree, listnode);
}
node = node->next;
}
return spellt;
}
spell_t *
spell_init(const char *dictionary_path, const char *whitelist_filepath)
{
FILE *f;
spell_t *spellt;
trie_t *words_tree = NULL;
static rb_tree_t *soundex_tree;
spellt = malloc(sizeof(*spellt));
words_tree = trie_init();
spellt->dictionary = words_tree;
spellt->ngrams_tree = NULL;
spellt->soundex_tree = NULL;
char *word = NULL;
char *line = NULL;
size_t linesize = 0;
size_t wordsize = 0;
ssize_t bytes_read;
word_count *wcnode;
word_count wc;
wc.count = 0;
if (whitelist_filepath != NULL && (f = fopen(whitelist_filepath, "r")) != NULL) {
if ((parse_file_and_generate_trie(f, words_tree, 0)) < 0) {
spell_destroy(spellt);
fclose(f);
return NULL;
}
}
if ((f = fopen(dictionary_path, "r")) == NULL) {
spell_destroy(spellt);
return NULL;
}
if ((parse_file_and_generate_trie(f, words_tree, '\t')) < 0) {
spell_destroy(spellt);
fclose(f);
return NULL;
}
fclose(f);
if ((f = fopen("dict/soundex.txt", "r")) != NULL) {
static const rb_tree_ops_t soundex_tree_ops = {
.rbto_compare_nodes = compare_listnodes,
.rbto_compare_key = compare_listnodes,
.rbto_node_offset = offsetof(word_list, rbtree),
.rbto_context = NULL
};
soundex_tree = malloc(sizeof(*soundex_tree));
rb_tree_init(soundex_tree, &soundex_tree_ops);
spellt->soundex_tree = soundex_tree;
while ((bytes_read = getline(&line, &linesize, f)) != -1) {
line[--bytes_read] = 0;
char *templine = line;
char *tabindex = strchr(templine, '\t');
if (tabindex == NULL) {
free(soundex_tree);
free(spellt);
fclose(f);
free(line);
return spellt;
}
tabindex[0] = 0;
char *soundex_code = templine;
templine = tabindex + 1;
word = templine;
word_list *listnode;
word_list templistnode;
templistnode.word = soundex_code;
listnode = rb_tree_find_node(soundex_tree, &templistnode);
if (listnode != NULL) {
word_list *newlistnode = malloc(sizeof(*newlistnode));
newlistnode->word = strdup(word);
newlistnode->next = listnode->next;
newlistnode->weight = .01;
listnode->next = newlistnode;
} else {
listnode = malloc(sizeof(*listnode));
listnode->word = strdup(soundex_code);
word_list *newlistnode = malloc(sizeof(*newlistnode));
newlistnode->word = strdup(word);
newlistnode->next = NULL;
newlistnode->weight = .01;
listnode->next= newlistnode;
rb_tree_insert_node(soundex_tree, listnode);
}
free(line);
line = NULL;
}
free(line);
line = NULL;
fclose(f);
}
free(line);
return spellt;
}
char *
soundex(const char *word)
{
if (word[0] == 0)
return NULL;
char *soundex_code = malloc(5);
char *snd_buffer = strdup(word);
lower(snd_buffer);
snd_buffer[0] = toupper(snd_buffer[0]);
int i = 1;
char c;
int soundex_len = 1;
while (snd_buffer[i] != 0) {
c = snd_buffer[i];
switch (c) {
case 'a':
case 'e':
case 'i':
case 'o':
case 'u':
case 'h':
case 'y':
case 'w':
snd_buffer[i++] = '-';
break;
case 'b':
case 'f':
case 'p':
case 'v':
snd_buffer[i++] = '1';
break;
case 'c':
case 'g':
case 'j':
case 'k':
case 'q':
case 's':
case 'x':
case 'z':
snd_buffer[i++] = '2';
break;
case 'd':
case 't':
snd_buffer[i++] = '3';
break;
case 'l':
snd_buffer[i++] = '4';
break;
case 'm':
case 'n':
snd_buffer[i++] = '5';
break;
case 'r':
snd_buffer[i++] = '6';
break;
case '-':
case '\'':
case ' ':
case '/':
/* Ignore hyphens or apostrophies */
snd_buffer[i++] = '_';
break;
default:
free(soundex_code);
free(snd_buffer);
return NULL;
}
}
i = 1;
c = 0;
while (snd_buffer[i] != 0) {
if (snd_buffer[i] == '_') {
i++;
continue;
}
if (snd_buffer[i] == '-') {
c = 0;
i++;
continue;
}
if (c == 0) {
c = snd_buffer[i++];
continue;
}
if (c == snd_buffer[i]) {
snd_buffer[i++] = '-';
continue;
}
c = snd_buffer[i++];
}
i = 1;
soundex_code[0] = snd_buffer[0];
while (snd_buffer[i] != 0 && soundex_len != 4) {
if (snd_buffer[i] == '-' || snd_buffer[i] == '_') {
i++;
continue;
}
soundex_code[soundex_len++] = snd_buffer[i++];
}
while (soundex_len <= 4)
soundex_code[soundex_len++] = '0';
soundex_code[4] = 0;
free(snd_buffer);
return soundex_code;
}
static word_list *
copy_word_list(word_list * list)
{
if (list == NULL)
return NULL;
word_list *newnode;
word_list *tail = NULL;
word_list *head = NULL;
word_list *tempnode = list;
while (tempnode != NULL) {
newnode = malloc(sizeof(*newnode));
newnode->word = strdup(tempnode->word);
newnode->weight = tempnode->weight;
newnode->next = NULL;
if (head == NULL)
head = newnode;
if (tail == NULL)
tail = newnode;
else {
tail->next = newnode;
tail = newnode;
}
tempnode = tempnode->next;
}
return head;
}
static word_list *
get_soundex2_list(spell_t *spell, char *word)
{
word_list soundex_node;
word_list *soundexes = NULL;
word_list *temp;
char *soundex_code = double_metaphone(word);
if (soundex_code == NULL)
return NULL;
word_list *distance_one_mphones = edits1(soundex_code, 1);
free(soundex_code);
word_list *distance_two_mphones = edits_plus_one(distance_one_mphones);
word_list *node = distance_two_mphones;
if (node == NULL)
warnx("node null for word %s", word);
while (node->next != NULL) {
soundex_node.word = node->word;
word_list *soundexes1 = rb_tree_find_node(spell->soundex_tree, &soundex_node);
if (soundexes1 != NULL) {
if (soundexes == NULL)
soundexes = copy_word_list(soundexes1->next);
else
append_word_list(soundexes, copy_word_list(soundexes1->next));
}
node = node->next;
}
free_word_list(distance_one_mphones);
free_word_list(distance_two_mphones);
return soundexes;
}
static word_list *
get_soundex_list(spell_t *spell, char *word)
{
word_list soundex_node;
word_list *soundexes = NULL;
word_list *temp;
char *soundex_code = double_metaphone(word);
if (soundex_code == NULL)
return NULL;