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/**
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* Copyright (c) 2013, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file fs-extension-functions.cc
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <string>
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#include <stddef.h>
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#include "sqlite3.h"
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#include "sqlite-extension-func.h"
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static void sql_basename(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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const char *path_in;
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int text_end = -1;
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if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
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sqlite3_result_null(context);
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return;
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}
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path_in = (const char *)sqlite3_value_text(argv[0]);
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if (path_in[0] == '\0') {
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sqlite3_result_text(context, ".", 1, SQLITE_STATIC);
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return;
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}
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for (ssize_t lpc = strlen(path_in) - 1; lpc >= 0; lpc--) {
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if (path_in[lpc] == '/' || path_in[lpc] == '\\') {
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if (text_end != -1) {
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sqlite3_result_text(context,
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&path_in[lpc + 1], (int) (text_end - lpc - 1),
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SQLITE_TRANSIENT);
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return;
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}
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}
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else if (text_end == -1) {
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text_end = (int) (lpc + 1);
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}
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}
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if (text_end == -1) {
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sqlite3_result_text(context, "/", 1, SQLITE_STATIC);
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}
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else {
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sqlite3_result_text(context,
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path_in, text_end,
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SQLITE_TRANSIENT);
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}
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}
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static void sql_dirname(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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const char *path_in;
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ssize_t text_end;
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if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
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sqlite3_result_null(context);
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return;
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}
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path_in = (const char *)sqlite3_value_text(argv[0]);
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text_end = strlen(path_in) - 1;
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while (text_end >= 0 &&
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(path_in[text_end] == '/' || path_in[text_end] == '\\')) {
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text_end -= 1;
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}
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while (text_end >= 0) {
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if (path_in[text_end] == '/' || path_in[text_end] == '\\') {
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sqlite3_result_text(context,
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path_in, (int) (text_end == 0 ? 1 : text_end),
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SQLITE_TRANSIENT);
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return;
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}
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text_end -= 1;
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}
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if (text_end == -1) {
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sqlite3_result_text(context,
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path_in[0] == '/' ? "/" : ".", 1,
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SQLITE_STATIC);
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return;
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}
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}
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static void sql_joinpath(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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std::string full_path;
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int lpc;
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if (argc == 0) {
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sqlite3_result_null(context);
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return;
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}
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for (lpc = 0; lpc < argc; lpc++) {
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if (sqlite3_value_type(argv[lpc]) == SQLITE_NULL) {
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sqlite3_result_null(context);
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return;
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}
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}
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for (lpc = 0; lpc < argc; lpc++) {
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const char *path_in;
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path_in = (const char *)sqlite3_value_text(argv[lpc]);
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if (path_in[0] == '/' || path_in[0] == '\\') {
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full_path.clear();
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}
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if (!full_path.empty() &&
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full_path[full_path.length() - 1] != '/' &&
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full_path[full_path.length() - 1] != '\\') {
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full_path += "/";
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}
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full_path += path_in;
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}
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sqlite3_result_text(context, full_path.c_str(), -1, SQLITE_TRANSIENT);
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}
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int fs_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 fs_funcs[] = {
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{ "basename", 1, 0, SQLITE_UTF8, 0, sql_basename },
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{ "dirname", 1, 0, SQLITE_UTF8, 0, sql_dirname },
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{ "joinpath", -1, 0, SQLITE_UTF8, 0, sql_joinpath },
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/*
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* TODO: add other functions like readlink, normpath, ...
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*/
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{ NULL }
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};
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*basic_funcs = fs_funcs;
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*agg_funcs = NULL;
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return SQLITE_OK;
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}
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