mirror of https://github.com/tstack/lnav.git
261 lines
8.8 KiB
C++
261 lines
8.8 KiB
C++
/**
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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
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* ON 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 <string>
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "config.h"
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#include "sqlite-extension-func.hh"
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#include "sqlite3.h"
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#include "vtab_module.hh"
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using namespace mapbox;
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static util::variant<const char*, string_fragment>
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sql_basename(const char* path_in)
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{
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int text_end = -1;
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if (path_in[0] == '\0') {
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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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return string_fragment(path_in, lpc + 1, text_end);
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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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return "/";
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} else {
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return string_fragment(path_in, 0, text_end);
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}
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}
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static util::variant<const char*, string_fragment>
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sql_dirname(const char* path_in)
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{
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ssize_t text_end;
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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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{
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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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return string_fragment(path_in, 0, text_end == 0 ? 1 : text_end);
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}
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text_end -= 1;
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}
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return path_in[0] == '/' ? "/" : ".";
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}
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static nonstd::optional<std::string>
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sql_joinpath(const std::vector<const char*>& paths)
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{
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std::string full_path;
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if (paths.empty()) {
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return nonstd::nullopt;
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}
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for (auto& path_in : paths) {
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if (path_in == nullptr) {
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return nonstd::nullopt;
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}
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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() && full_path[full_path.length() - 1] != '/'
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&& full_path[full_path.length() - 1] != '\\')
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{
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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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return full_path;
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}
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static std::string
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sql_readlink(const char* path)
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{
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struct stat st;
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if (lstat(path, &st) == -1) {
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throw sqlite_func_error(
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"unable to stat path: {} -- {}", path, strerror(errno));
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}
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char buf[st.st_size];
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ssize_t rc;
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rc = readlink(path, buf, sizeof(buf));
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if (rc < 0) {
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if (errno == EINVAL) {
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return path;
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}
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throw sqlite_func_error(
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"unable to read link: {} -- {}", path, strerror(errno));
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}
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return std::string(buf, rc);
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}
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static std::string
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sql_realpath(const char* path)
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{
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char resolved_path[PATH_MAX];
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if (realpath(path, resolved_path) == nullptr) {
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throw sqlite_func_error(
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"Could not get real path for {} -- {}", path, strerror(errno));
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}
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return resolved_path;
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}
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int
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fs_extension_functions(struct FuncDef** basic_funcs,
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struct FuncDefAgg** agg_funcs)
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{
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static struct FuncDef fs_funcs[] = {
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sqlite_func_adapter<decltype(&sql_basename), sql_basename>::builder(
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help_text("basename", "Extract the base portion of a pathname.")
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.sql_function()
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.with_parameter({"path", "The path"})
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.with_tags({"filename"})
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.with_example({"To get the base of a plain file name",
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"SELECT basename('foobar')"})
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.with_example(
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{"To get the base of a path", "SELECT basename('foo/bar')"})
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.with_example({"To get the base of a directory",
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"SELECT basename('foo/bar/')"})
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.with_example({"To get the base of an empty string",
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"SELECT basename('')"})
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.with_example({"To get the base of a Windows path",
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"SELECT basename('foo\\bar')"})
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.with_example({"To get the base of the root directory",
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"SELECT basename('/')"})),
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sqlite_func_adapter<decltype(&sql_dirname), sql_dirname>::builder(
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help_text("dirname", "Extract the directory portion of a pathname.")
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.sql_function()
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.with_parameter({"path", "The path"})
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.with_tags({"filename"})
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.with_example({"To get the directory of a relative file path",
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"SELECT dirname('foo/bar')"})
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.with_example({"To get the directory of an absolute file path",
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"SELECT dirname('/foo/bar')"})
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.with_example(
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{"To get the directory of a file in the root directory",
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"SELECT dirname('/bar')"})
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.with_example({"To get the directory of a Windows path",
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"SELECT dirname('foo\\bar')"})
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.with_example({"To get the directory of an empty path",
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"SELECT dirname('')"})),
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sqlite_func_adapter<decltype(&sql_joinpath), sql_joinpath>::builder(
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help_text("joinpath", "Join components of a path together.")
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.sql_function()
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.with_parameter(
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help_text(
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"path",
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"One or more path components to join together. "
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"If an argument starts with a forward or backward "
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"slash, it will be considered "
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"an absolute path and any preceding elements will "
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"be ignored.")
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.one_or_more())
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.with_tags({"filename"})
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.with_example(
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{"To join a directory and file name into a relative path",
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"SELECT joinpath('foo', 'bar')"})
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.with_example(
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{"To join an empty component with other names into "
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"a relative path",
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"SELECT joinpath('', 'foo', 'bar')"})
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.with_example(
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{"To create an absolute path with two path components",
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"SELECT joinpath('/', 'foo', 'bar')"})
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.with_example(
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{"To create an absolute path from a path component "
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"that starts with a forward slash",
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"SELECT joinpath('/', 'foo', '/bar')"})),
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sqlite_func_adapter<decltype(&sql_readlink), sql_readlink>::builder(
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help_text("readlink", "Read the target of a symbolic link.")
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.sql_function()
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.with_parameter({"path", "The path to the symbolic link."})
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.with_tags({"filename"})),
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sqlite_func_adapter<decltype(&sql_realpath), sql_realpath>::builder(
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help_text(
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"realpath",
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"Returns the resolved version of the given path, expanding "
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"symbolic links and "
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"resolving '.' and '..' references.")
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.sql_function()
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.with_parameter({"path", "The path to resolve."})
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.with_tags({"filename"})),
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/*
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* TODO: add other functions like normpath, ...
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*/
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{nullptr},
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};
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*basic_funcs = fs_funcs;
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*agg_funcs = nullptr;
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return SQLITE_OK;
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}
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