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126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/*
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* Written by Alexey Tourbin <at@altlinux.org>.
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*
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* The author has dedicated the code to the public domain. Anyone is free
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* to copy, modify, publish, use, compile, sell, or distribute the original
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* code, either in source code form or as a compiled binary, for any purpose,
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* commercial or non-commercial, and by any means.
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sqlite3.h>
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#include "pcrepp.hh"
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#include "sqlite-extension-func.h"
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typedef struct {
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char * s;
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pcre * p;
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pcre_extra *e;
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} cache_entry;
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#ifndef CACHE_SIZE
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#define CACHE_SIZE 16
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#endif
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static
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void regexp(sqlite3_context *ctx, int argc, sqlite3_value **argv)
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{
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const char *re, *str;
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pcre * p;
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pcre_extra *e;
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assert(argc == 2);
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re = (const char *)sqlite3_value_text(argv[0]);
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if (!re) {
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sqlite3_result_error(ctx, "no regexp", -1);
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return;
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}
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str = (const char *)sqlite3_value_text(argv[1]);
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if (!str) {
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sqlite3_result_error(ctx, "no string", -1);
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return;
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}
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/* simple LRU cache */
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{
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static cache_entry cache[CACHE_SIZE];
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int i;
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int found = 0;
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for (i = 0; i < CACHE_SIZE && cache[i].s; i++) {
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if (strcmp(re, cache[i].s) == 0) {
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found = 1;
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break;
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}
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}
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if (found) {
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if (i > 0) {
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cache_entry c = cache[i];
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memmove(cache + 1, cache, i * sizeof(cache_entry));
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cache[0] = c;
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}
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}
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else {
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cache_entry c;
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const char *err;
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int pos;
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c.p = pcre_compile(re, 0, &err, &pos, NULL);
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if (!c.p) {
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char *e2 = sqlite3_mprintf("%s: %s (offset %d)", re, err, pos);
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sqlite3_result_error(ctx, e2, -1);
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sqlite3_free(e2);
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return;
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}
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c.e = pcre_study(c.p, 0, &err);
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c.s = strdup(re);
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if (!c.s) {
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sqlite3_result_error(ctx, "strdup: ENOMEM", -1);
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pcre_free(c.p);
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pcre_free(c.e);
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return;
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}
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i = CACHE_SIZE - 1;
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if (cache[i].s) {
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free(cache[i].s);
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assert(cache[i].p);
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pcre_free(cache[i].p);
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pcre_free(cache[i].e);
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}
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memmove(cache + 1, cache, i * sizeof(cache_entry));
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cache[0] = c;
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}
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p = cache[0].p;
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e = cache[0].e;
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}
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{
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int rc;
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assert(p);
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rc = pcre_exec(p, e, str, strlen(str), 0, 0, NULL, 0);
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sqlite3_result_int(ctx, rc >= 0);
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return;
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}
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}
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int string_extension_functions(const struct FuncDef **basic_funcs,
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const struct FuncDefAgg **agg_funcs)
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{
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static const struct FuncDef string_funcs[] = {
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{ "regexp", 2, 0, SQLITE_UTF8, 0, regexp },
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{ NULL }
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};
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*basic_funcs = string_funcs;
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return SQLITE_OK;
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}
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