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+/**
+ * Copyright (c) 2015, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file shlex.cc
+ */
+
+#ifdef __CYGWIN__
+# include <alloca.h>
+#endif
+
+#include "config.h"
+#include "shlex.hh"
+
+bool
+shlex::tokenize(string_fragment& cap_out, shlex_token_t& token_out)
+{
+ while (this->s_index < this->s_len) {
+ switch (this->s_str[this->s_index]) {
+ case '\\':
+ cap_out.sf_begin = this->s_index;
+ if (this->s_index + 1 < this->s_len) {
+ token_out = shlex_token_t::ST_ESCAPE;
+ this->s_index += 2;
+ cap_out.sf_end = this->s_index;
+ } else {
+ this->s_index += 1;
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_ERROR;
+ }
+ return true;
+ case '\"':
+ if (!this->s_ignore_quotes) {
+ switch (this->s_state) {
+ case state_t::STATE_NORMAL:
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_DOUBLE_QUOTE_START;
+ this->s_state = state_t::STATE_IN_DOUBLE_QUOTE;
+ return true;
+ case state_t::STATE_IN_DOUBLE_QUOTE:
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_DOUBLE_QUOTE_END;
+ this->s_state = state_t::STATE_NORMAL;
+ return true;
+ default:
+ break;
+ }
+ }
+ break;
+ case '\'':
+ if (!this->s_ignore_quotes) {
+ switch (this->s_state) {
+ case state_t::STATE_NORMAL:
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_SINGLE_QUOTE_START;
+ this->s_state = state_t::STATE_IN_SINGLE_QUOTE;
+ return true;
+ case state_t::STATE_IN_SINGLE_QUOTE:
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_SINGLE_QUOTE_END;
+ this->s_state = state_t::STATE_NORMAL;
+ return true;
+ default:
+ break;
+ }
+ }
+ break;
+ case '$':
+ switch (this->s_state) {
+ case state_t::STATE_NORMAL:
+ case state_t::STATE_IN_DOUBLE_QUOTE:
+ this->scan_variable_ref(cap_out, token_out);
+ return true;
+ default:
+ break;
+ }
+ break;
+ case '~':
+ switch (this->s_state) {
+ case state_t::STATE_NORMAL:
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ while (this->s_index < this->s_len
+ && (isalnum(this->s_str[this->s_index])
+ || this->s_str[this->s_index] == '_'
+ || this->s_str[this->s_index] == '-'))
+ {
+ this->s_index += 1;
+ }
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_TILDE;
+ return true;
+ default:
+ break;
+ }
+ break;
+ case ' ':
+ case '\t':
+ switch (this->s_state) {
+ case state_t::STATE_NORMAL:
+ cap_out.sf_begin = this->s_index;
+ while (isspace(this->s_str[this->s_index])) {
+ this->s_index += 1;
+ }
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_WHITESPACE;
+ return true;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ this->s_index += 1;
+ }
+
+ return false;
+}
+
+void
+shlex::scan_variable_ref(string_fragment& cap_out, shlex_token_t& token_out)
+{
+ cap_out.sf_begin = this->s_index;
+ this->s_index += 1;
+ if (this->s_index >= this->s_len) {
+ cap_out.sf_end = this->s_index;
+ token_out = shlex_token_t::ST_ERROR;
+ return;
+ }
+
+ if (this->s_str[this->s_index] == '{') {
+ token_out = shlex_token_t::ST_QUOTED_VARIABLE_REF;
+ this->s_index += 1;
+ } else {
+ token_out = shlex_token_t::ST_VARIABLE_REF;
+ }
+
+ while (this->s_index < this->s_len) {
+ if (token_out == shlex_token_t::ST_VARIABLE_REF) {
+ if (isalnum(this->s_str[this->s_index])
+ || this->s_str[this->s_index] == '#'
+ || this->s_str[this->s_index] == '_')
+ {
+ this->s_index += 1;
+ } else {
+ break;
+ }
+ } else {
+ if (this->s_str[this->s_index] == '}') {
+ this->s_index += 1;
+ break;
+ }
+ this->s_index += 1;
+ }
+ }
+
+ cap_out.sf_end = this->s_index;
+ if (token_out == shlex_token_t::ST_QUOTED_VARIABLE_REF
+ && this->s_str[this->s_index - 1] != '}')
+ {
+ cap_out.sf_begin += 1;
+ cap_out.sf_end = cap_out.sf_begin + 1;
+ token_out = shlex_token_t::ST_ERROR;
+ }
+}
+
+void
+shlex::resolve_home_dir(std::string& result, string_fragment cap) const
+{
+ if (cap.length() == 1) {
+ result.append(getenv_opt("HOME").value_or("~"));
+ } else {
+ auto username = (char*) alloca(cap.length());
+
+ memcpy(username, &this->s_str[cap.sf_begin + 1], cap.length() - 1);
+ username[cap.length() - 1] = '\0';
+ auto pw = getpwnam(username);
+ if (pw != nullptr) {
+ result.append(pw->pw_dir);
+ } else {
+ result.append(&this->s_str[cap.sf_begin], cap.length());
+ }
+ }
+}
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