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127 lines
2.1 KiB
C
127 lines
2.1 KiB
C
/*
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* stopword library
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* Teodor Sigaev <teodor@sigaev.ru>
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "postgres.h"
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#include "common.h"
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#include "dict.h"
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#define STOPBUFLEN 4096
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char *
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lowerstr(char *str)
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{
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char *ptr = str;
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while (*ptr)
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{
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*ptr = tolower(*(unsigned char *) ptr);
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ptr++;
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}
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return str;
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}
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void
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freestoplist(StopList * s)
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{
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char **ptr = s->stop;
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if (ptr)
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while (*ptr && s->len > 0)
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{
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free(*ptr);
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ptr++;
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s->len--;
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free(s->stop);
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}
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memset(s, 0, sizeof(StopList));
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}
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void
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readstoplist(text *in, StopList * s)
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{
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char **stop = NULL;
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s->len = 0;
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if (in && VARSIZE(in) - VARHDRSZ > 0)
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{
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char *filename = text2char(in);
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FILE *hin = NULL;
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char buf[STOPBUFLEN];
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int reallen = 0;
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if ((hin = fopen(filename, "r")) == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("could not open file \"%s\": %m",
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filename)));
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while (fgets(buf, STOPBUFLEN, hin))
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{
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buf[strlen(buf) - 1] = '\0';
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if (*buf == '\0')
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continue;
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if (s->len >= reallen)
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{
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char **tmp;
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reallen = (reallen) ? reallen * 2 : 16;
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tmp = (char **) realloc((void *) stop, sizeof(char *) * reallen);
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if (!tmp)
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{
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freestoplist(s);
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fclose(hin);
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ereport(ERROR,
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(errcode(ERRCODE_OUT_OF_MEMORY),
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errmsg("out of memory")));
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}
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stop = tmp;
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}
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stop[s->len] = strdup(buf);
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if (!stop[s->len])
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{
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freestoplist(s);
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fclose(hin);
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ereport(ERROR,
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(errcode(ERRCODE_OUT_OF_MEMORY),
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errmsg("out of memory")));
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}
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if (s->wordop)
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stop[s->len] = (s->wordop) (stop[s->len]);
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(s->len)++;
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}
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fclose(hin);
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pfree(filename);
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}
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s->stop = stop;
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}
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static int
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comparestr(const void *a, const void *b)
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{
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return strcmp(*(char **) a, *(char **) b);
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}
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void
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sortstoplist(StopList * s)
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{
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if (s->stop && s->len > 0)
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qsort(s->stop, s->len, sizeof(char *), comparestr);
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}
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bool
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searchstoplist(StopList * s, char *key)
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{
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if (s->wordop)
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key = (*(s->wordop)) (key);
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return (s->stop && s->len > 0 && bsearch(&key, s->stop, s->len, sizeof(char *), comparestr)) ? true : false;
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}
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