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mgroot
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5.4: Pipes | 1. Simple shell pipe done
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‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/.gitignore

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simple-shell-pipe

‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/Makefile

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NAME := simple-shell-pipe
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CC := g++
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CFLAGS := -std=c++17 -Wall -Wextra -Werror -g
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DEP_FLAGS := -MP -MMD
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SRCS_DIRS := $(addprefix src, \
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/ \
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/Command \
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/Executor \
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/Env \
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)
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vpath %.cpp $(SRCS_DIRS)
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vpath %.hpp $(SRCS_DIRS)
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SRCS := main.cpp \
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Command/Command.cpp \
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Executor/Executor.cpp \
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Env/Env.cpp
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OBJS_DIR := .objects
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OBJS := $(addprefix $(OBJS_DIR)/, \
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$(patsubst %.cpp, %.o, $(SRCS)))
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DEPS := $(addprefix $(OBJS_DIR)/, \
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$(patsubst %.cpp, %.d, $(SRCS)))
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all:
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@echo "$(FMT_BOLD)Creating/updating $(FMT_WHITE_B)'$(NAME)'$(FMT_BOLD):$(FMT_DEF)"
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@$(MAKE) --no-print-directory $(NAME)
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$(NAME): $(OBJS) Makefile
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@echo "$(FMT_BOLD)Linking files...$(FMT_DEF)"
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@$(CC) $(OBJS) $(CFLAGS) -o $@
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@echo "$(FMT_WHITE_B)'$(NAME)'$(FMT_BOLD) has been created/updated.$(FMT_DEF)"
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$(OBJS_DIR)/%.o: %.cpp | $(OBJS_DIR)
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@echo "Assembling $<..."
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@mkdir -p $(dir $@)
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@$(CC) $(CFLAGS) $(DEP_FLAGS) -c $< -o $@
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$(OBJS_DIR):
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@mkdir -p $@
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@echo "$(FMT_BOLD)Directory '$(OBJS_DIR)' has been created.$(FMT_DEF)"
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clean:
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@rm -rf $(OBJS) $(DEPS) $(OBJS_DIR)
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@echo "$(FMT_WHITE)$(NAME): $(FMT_BOLD)Object files have been cleaned.$(FMT_DEF)"
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fclean: clean
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@rm -rf $(NAME)
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@echo "$(FMT_WHITE)'$(NAME)'$(FMT_BOLD) has been cleaned.$(FMT_DEF)"
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re: fclean all
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.PHONY: all clean fclean re
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-include $(DEPS)
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FMT_BOLD := \033[0;1m
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FMT_WHITE_B := \033[1;37m
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FMT_WHITE := \033[37m
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FMT_DEF := \033[0;39m

‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/src/Command/Command.cpp

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#include "Command.hpp"
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#include "../Env/Env.hpp"
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#include <algorithm>
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namespace PipeApp
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{
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////////////////////
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// Command //
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////////////////////
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Command::Command(const std::string::const_iterator& begin,
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const std::string::const_iterator& end)
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{
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// Get command
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auto begin_it = std::find_if(begin, end,
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[] (char c) { return !::isspace(c); });
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auto end_it = std::find_if(begin_it, end,
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[] (char c) { return ::isspace(c); });
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{
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std::string temp_command = Env::getFromPath(std::string(begin_it, end_it));
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this->command_ = new char[temp_command.size() + 1];
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::memcpy(this->command_, temp_command.c_str(), temp_command.size() + 1);
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}
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// Get argv
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std::vector<std::string> argv;
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argv.push_back(std::string(begin_it, end_it));
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while (end_it != end)
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{
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begin_it = std::find_if(end_it, end,
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[] (char c) { return !::isspace(c); });
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end_it = std::find_if(begin_it, end,
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[] (char c) { return ::isspace(c); });
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if (begin_it != end_it)
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argv.push_back(std::string(begin_it, end_it));
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}
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this->argv_ = new char*[argv.size() + 1];
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for (size_t i = 0; i < argv.size(); ++i)
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{
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this->argv_[i] = new char[argv[i].size() + 1];
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::memcpy(this->argv_[i], argv[i].c_str(), argv[i].size() + 1);
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}
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this->argv_[argv.size()] = nullptr;
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}
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Command::Command(const std::string& command)
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: Command(command.cbegin(), command.cend())
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{}
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Command::Command(Command&& old)
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: command_(old.command_), argv_(old.argv_)
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{
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old.command_ = nullptr;
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old.argv_ = nullptr;
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}
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Command& Command::operator=(Command&& old)
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{
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if (this == &old)
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return *this;
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this->command_ = old.command_; old.command_ = nullptr;
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this->argv_ = old.argv_; old.argv_ = nullptr;
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return *this;
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}
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Command::~Command()
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{
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delete[] this->command_;
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if (this->argv_)
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{
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size_t i = 0;
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while (this->argv_[i])
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delete[] this->argv_[i++];
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delete[] this->argv_;
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}
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}
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const char* Command::getCommand() const
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{
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return this->command_;
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}
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char* const* Command::getArgv()
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{
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return this->argv_;
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}
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////////////////////
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// Command List //
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////////////////////
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CommandList::CommandList(const std::string& commandline)
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{
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// init iterators
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auto begin_it = commandline.cbegin();
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auto end_it = std::find(commandline.begin(), commandline.end(), '|');
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// parse commands
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while (begin_it != commandline.cend())
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{
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this->container_.emplace_back(begin_it, end_it);
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begin_it = (end_it != commandline.end()) ? std::next(end_it) : end_it;
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end_it = std::find(begin_it, commandline.end(), '|');
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}
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}
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CommandList::CommandList(CommandList&& old)
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: container_(std::move(old.container_))
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{}
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CommandList& CommandList::operator=(CommandList&& old)
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{
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if (this == &old)
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return *this;
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this->container_ = std::move(old.container_);
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return *this;
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}
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CommandList::iterator CommandList::begin()
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{
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return this->container_.begin();
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}
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CommandList::iterator CommandList::end()
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{
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return this->container_.end();
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}
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} //!namespace PipeApp

‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/src/Command/Command.hpp

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#pragma once
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#include <vector>
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#include <string>
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namespace PipeApp
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{
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class Command final
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{
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// Fields
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private:
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char* command_;
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char** argv_;
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// Constructor and destructor
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public:
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Command(const std::string::const_iterator& begin,
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const std::string::const_iterator& end);
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Command(const std::string& command);
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Command(Command&& old);
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Command& operator=(Command&& old);
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Command(const Command& other) = delete;
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Command& operator=(const Command& other) = delete;
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~Command();
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// Logic
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const char* getCommand() const;
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char* const* getArgv();
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}; //!class Command final
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class CommandList final
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{
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// Fields
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public:
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using container = std::vector<Command>;
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using iterator = typename container::iterator;
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private:
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std::vector<Command> container_;
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// Constructor and destructor
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public:
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CommandList(const std::string& commandline);
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CommandList(CommandList&& old);
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CommandList& operator=(CommandList&& old);
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CommandList(const CommandList& other) = delete;
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CommandList& operator=(const CommandList& other) = delete;
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~CommandList() = default;
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// Logic
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iterator begin();
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iterator end();
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}; //!class CommandList final
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} //!namespace PipeApp

‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/src/Env/Env.cpp

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#include "Env.hpp"
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#include <cstring>
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#include <string>
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#include <algorithm>
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#include <sys/types.h>
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#include <sys/stat.h>
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namespace PipeApp::Env
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{
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static bool isExecutable(const char *path)
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{
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struct stat sb;
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if (stat(path, &sb) != 0)
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return false;
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return sb.st_mode & S_IXUSR;
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}
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std::string getFromPath(const std::string& command)
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{
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size_t i = 0;
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for (; environ[i]; ++i)
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if (::strncmp(environ[i], "PATH=", 5) == 0)
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break;
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// original
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if (!environ[i])
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return command;
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// with path
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std::string path_value(environ[i] + 5);
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auto begin_it = path_value.begin();
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auto end_it = std::find(begin_it, path_value.end(), ':');
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while (begin_it != path_value.end())
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{
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std::string temp_path(begin_it, end_it);
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if (temp_path.back() != '/')
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temp_path.push_back('/');
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temp_path += command;
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if (isExecutable(temp_path.c_str()))
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return temp_path;
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begin_it = (end_it != path_value.end()) ? std::next(end_it) : end_it;
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end_it = std::find(begin_it, path_value.end(), ':');
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}
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return command;
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}
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} //!namespace PipeApp::Env

‎5_Processes_Signals_Files_Pipes/4_Pipes/1_Simple-shell-pipe/src/Env/Env.hpp

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#pragma once
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#include <string>
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extern char * const *environ;
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namespace PipeApp::Env
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{
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std::string getFromPath(const std::string& command);
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} //!namespace PipeApp::Env

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