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219 lines
8.1 KiB
C++
219 lines
8.1 KiB
C++
/**
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* Copyright (c) 2015, 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 shlex.cc
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*/
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#ifdef __CYGWIN__
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# include <alloca.h>
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#endif
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#include "config.h"
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#include "shlex.hh"
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bool
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shlex::tokenize(string_fragment& cap_out, shlex_token_t& token_out)
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{
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while (this->s_index < this->s_len) {
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switch (this->s_str[this->s_index]) {
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case '\\':
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cap_out.sf_begin = this->s_index;
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if (this->s_index + 1 < this->s_len) {
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token_out = shlex_token_t::ST_ESCAPE;
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this->s_index += 2;
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cap_out.sf_end = this->s_index;
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} else {
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this->s_index += 1;
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_ERROR;
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}
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return true;
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case '\"':
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if (!this->s_ignore_quotes) {
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switch (this->s_state) {
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case state_t::STATE_NORMAL:
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_DOUBLE_QUOTE_START;
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this->s_state = state_t::STATE_IN_DOUBLE_QUOTE;
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return true;
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case state_t::STATE_IN_DOUBLE_QUOTE:
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_DOUBLE_QUOTE_END;
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this->s_state = state_t::STATE_NORMAL;
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return true;
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default:
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break;
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}
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}
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break;
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case '\'':
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if (!this->s_ignore_quotes) {
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switch (this->s_state) {
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case state_t::STATE_NORMAL:
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_SINGLE_QUOTE_START;
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this->s_state = state_t::STATE_IN_SINGLE_QUOTE;
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return true;
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case state_t::STATE_IN_SINGLE_QUOTE:
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_SINGLE_QUOTE_END;
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this->s_state = state_t::STATE_NORMAL;
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return true;
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default:
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break;
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}
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}
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break;
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case '$':
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switch (this->s_state) {
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case state_t::STATE_NORMAL:
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case state_t::STATE_IN_DOUBLE_QUOTE:
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this->scan_variable_ref(cap_out, token_out);
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return true;
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default:
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break;
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}
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break;
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case '~':
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switch (this->s_state) {
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case state_t::STATE_NORMAL:
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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while (this->s_index < this->s_len
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&& (isalnum(this->s_str[this->s_index])
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|| this->s_str[this->s_index] == '_'
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|| this->s_str[this->s_index] == '-'))
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{
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this->s_index += 1;
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}
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_TILDE;
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return true;
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default:
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break;
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}
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break;
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case ' ':
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case '\t':
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switch (this->s_state) {
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case state_t::STATE_NORMAL:
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cap_out.sf_begin = this->s_index;
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while (isspace(this->s_str[this->s_index])) {
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this->s_index += 1;
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}
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_WHITESPACE;
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return true;
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default:
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break;
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}
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break;
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default:
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break;
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}
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this->s_index += 1;
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}
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return false;
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}
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void
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shlex::scan_variable_ref(string_fragment& cap_out, shlex_token_t& token_out)
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{
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cap_out.sf_begin = this->s_index;
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this->s_index += 1;
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if (this->s_index >= this->s_len) {
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cap_out.sf_end = this->s_index;
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token_out = shlex_token_t::ST_ERROR;
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return;
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}
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if (this->s_str[this->s_index] == '{') {
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token_out = shlex_token_t::ST_QUOTED_VARIABLE_REF;
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this->s_index += 1;
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} else {
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token_out = shlex_token_t::ST_VARIABLE_REF;
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}
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while (this->s_index < this->s_len) {
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if (token_out == shlex_token_t::ST_VARIABLE_REF) {
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if (isalnum(this->s_str[this->s_index])
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|| this->s_str[this->s_index] == '#'
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|| this->s_str[this->s_index] == '_')
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{
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this->s_index += 1;
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} else {
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break;
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}
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} else {
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if (this->s_str[this->s_index] == '}') {
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this->s_index += 1;
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break;
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}
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this->s_index += 1;
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}
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}
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cap_out.sf_end = this->s_index;
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if (token_out == shlex_token_t::ST_QUOTED_VARIABLE_REF
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&& this->s_str[this->s_index - 1] != '}')
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{
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cap_out.sf_begin += 1;
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cap_out.sf_end = cap_out.sf_begin + 1;
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token_out = shlex_token_t::ST_ERROR;
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}
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}
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void
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shlex::resolve_home_dir(std::string& result, string_fragment cap) const
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{
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if (cap.length() == 1) {
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result.append(getenv_opt("HOME").value_or("~"));
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} else {
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auto username = (char*) alloca(cap.length());
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memcpy(username, &this->s_str[cap.sf_begin + 1], cap.length() - 1);
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username[cap.length() - 1] = '\0';
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auto pw = getpwnam(username);
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if (pw != nullptr) {
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result.append(pw->pw_dir);
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} else {
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result.append(&this->s_str[cap.sf_begin], cap.length());
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}
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}
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}
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