feat(libcmd): add command processing framework with built-in linenoise
- 纯 C 接口：命令注册/查找/补全/帮助 - CMD_REGISTER / CMD_REGISTER_C 宏（__attribute__((constructor)) 自动注册） - 内置 linenoise 行编辑（termios raw mode + 历史 + Tab 补全） - x86 编译通过，产物 libcmd.a
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# API-libcmd — 命令处理框架
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> 命令注册/分发/补全，内置 linenoise 行编辑，供 libdatacenter 等模块调试使用。
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## 接口
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| 函数/宏 | 说明 |
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|---------|------|
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| `cmd_manager_add_command(name, func, desc, complete)` | 注册命令 |
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| `cmd_manager_get_commands(out_count)` | 获取所有已注册命令列表 |
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| `cmd_help(argc, argv)` | 打印帮助信息 |
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| `cmd_find(name)` | 按名称查找命令 |
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| `cmd_complete(buf, completions, ncomp)` | Tab 自动补全回调 |
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| `cmd_sub_complete(buf, completions, ncomp, subs, sub_count)` | 子命令补全 |
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| `linenoise(prompt)` | 行编辑+历史交互式输入 |
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| `linenoiseFree(ptr)` | 释放 linenoise 返回的内存 |
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| `linenoiseHistoryAdd(line)` | 添加历史记录 |
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| `linenoiseHistoryFree()` | 释放历史 |
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| `lineniseSetCompletionCallback(cb)` | 设置自动补全回调 |
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| `CMD_REGISTER(name, func, desc)` | 注册命令宏（无补全） |
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| `CMD_REGISTER_C(name, func, desc, complete)` | 注册命令宏（带补全） |
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## 依赖
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- `myBase.h`
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- 无外部依赖（linenoise 内置实现）
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/**
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* @file myCmd.h
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* @brief 命令处理框架 — 纯 C 接口
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* @details 命令注册/分发/补全，内置 linenoise 行编辑。
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* 通过 `__attribute__((constructor))` 实现模块自动注册。
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*/
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#ifndef _MY_CMD_H_
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#define _MY_CMD_H_
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#include "myBase.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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typedef struct
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{
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const char *name;
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void (*func)(int argc, char *argv[]);
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const char *desc;
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void (*complete)(const char *buf, char ***completions, int *ncomp);
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} stru_cmd;
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/** 注册命令 */
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void cmd_manager_add_command(const char *name, void (*func)(int argc, char *argv[]),
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const char *desc, void (*complete)(const char *, char ***, int *));
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/** 获取所有已注册命令列表 */
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stru_cmd *cmd_manager_get_commands(unsigned int *out_count);
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/** 打印帮助信息 */
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void cmd_help(int argc, char *argv[]);
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/** 按名称查找命令 */
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stru_cmd *cmd_find(const char *name);
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/** Tab 自动补全回调 */
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void cmd_complete(const char *buf, char ***completions, int *ncomp);
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/** 子命令补全 */
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void cmd_sub_complete(const char *buf, char ***completions, int *ncomp,
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const char **subs, int sub_count);
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/** 行编辑交互式输入 */
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char *linenoise(const char *prompt);
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/** 释放 linenoise 返回的内存 */
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void linenoiseFree(void *ptr);
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/** 添加历史记录 */
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int linenoiseHistoryAdd(const char *line);
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/** 释放所有历史 */
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void linenoiseHistoryFree(void);
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/** 设置自动补全回调 */
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void lineniseSetCompletionCallback(void (*cb)(const char *, char ***, int *));
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/** 注册命令宏（无补全） */
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#define CMD_REGISTER(cmd_name, func_ptr, cmd_desc) \
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__attribute__((constructor)) static void register_##func_ptr(void) \
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{ \
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cmd_manager_add_command(cmd_name, func_ptr, cmd_desc, NULL); \
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}
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/** 注册命令宏（带补全） */
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#define CMD_REGISTER_C(cmd_name, func_ptr, cmd_desc, complete) \
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__attribute__((constructor)) static void register_##func_ptr(void) \
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{ \
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cmd_manager_add_command(cmd_name, func_ptr, cmd_desc, complete); \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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include ./../../../linux.mk
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L := $(notdir $(realpath $(CURDIR)/..))
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M := libcmd
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O := $(LIB_REL)/$(M).a
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S := $(SRC_ROOT_DIR)/$(L)/libcmd/src
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I := -I$(SRC_ROOT_DIR)/$(L)/libcmd/inc
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B := $(CURDIR)/$(M)/obj
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SRCS := $(wildcard $(S)/*.cpp)
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OBJS := $(patsubst $(S)/%.cpp, $(B)/%.o, $(SRCS))
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F := $(CXX_FLAGS) $(I)
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.PHONY: all
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all:
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@mkdir -p $(ROOT_DIR)/release/inc
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@cp -f $(S:src=inc)/*.h $(ROOT_DIR)/release/inc/ 2>/dev/null; true
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@$(MAKE) $(O)
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$(O): $(OBJS)
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@mkdir -p $(dir $@)
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$(AR) rcs $@ $^
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@echo "[$(M)] built"
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$(B)/%.o: $(S)/%.cpp
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@mkdir -p $(dir $@)
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$(CXX) $(F) -c $< -o $@
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.PHONY: clean
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clean:
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rm -rf $(B) $(O)
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.PHONY: rebuild
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rebuild: clean all
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/**
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* @file myCmd.h
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* @brief 命令处理框架 — 纯 C 接口
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* @details 命令注册/分发/补全，内置 linenoise 行编辑。
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* 通过 `__attribute__((constructor))` 实现模块自动注册。
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*/
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#ifndef _MY_CMD_H_
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#define _MY_CMD_H_
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#include "myBase.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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typedef struct
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{
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const char *name;
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void (*func)(int argc, char *argv[]);
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const char *desc;
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void (*complete)(const char *buf, char ***completions, int *ncomp);
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} stru_cmd;
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/** 注册命令 */
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void cmd_manager_add_command(const char *name, void (*func)(int argc, char *argv[]),
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const char *desc, void (*complete)(const char *, char ***, int *));
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/** 获取所有已注册命令列表 */
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stru_cmd *cmd_manager_get_commands(unsigned int *out_count);
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/** 打印帮助信息 */
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void cmd_help(int argc, char *argv[]);
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/** 按名称查找命令 */
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stru_cmd *cmd_find(const char *name);
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/** Tab 自动补全回调 */
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void cmd_complete(const char *buf, char ***completions, int *ncomp);
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/** 子命令补全 */
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void cmd_sub_complete(const char *buf, char ***completions, int *ncomp,
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const char **subs, int sub_count);
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/** 行编辑交互式输入 */
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char *linenoise(const char *prompt);
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/** 释放 linenoise 返回的内存 */
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void linenoiseFree(void *ptr);
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/** 添加历史记录 */
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int linenoiseHistoryAdd(const char *line);
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/** 释放所有历史 */
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void linenoiseHistoryFree(void);
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/** 设置自动补全回调 */
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void lineniseSetCompletionCallback(void (*cb)(const char *, char ***, int *));
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/** 注册命令宏（无补全） */
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#define CMD_REGISTER(cmd_name, func_ptr, cmd_desc) \
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__attribute__((constructor)) static void register_##func_ptr(void) \
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{ \
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cmd_manager_add_command(cmd_name, func_ptr, cmd_desc, NULL); \
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}
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/** 注册命令宏（带补全） */
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#define CMD_REGISTER_C(cmd_name, func_ptr, cmd_desc, complete) \
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__attribute__((constructor)) static void register_##func_ptr(void) \
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{ \
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cmd_manager_add_command(cmd_name, func_ptr, cmd_desc, complete); \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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/**
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* @file myCmd.cpp
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* @brief 命令处理框架实现 — 命令注册/分发 + 内置 linenoise 行编辑
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*/
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#include "myCmd.h"
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#include <vector>
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#include <cstring>
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#include <cstdio>
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#include <cstdlib>
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#include <unistd.h>
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#include <termios.h>
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#include <signal.h>
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extern "C"
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{
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/* ===== 命令注册表 ===== */
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static std::vector<stru_cmd> &get_cmd_list(void)
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{
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static std::vector<stru_cmd> s_cmd_list;
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return s_cmd_list;
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}
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void cmd_manager_add_command(const char *name, void (*func)(int argc, char *argv[]),
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const char *desc, void (*complete)(const char *, char ***, int *))
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{
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if (!name || !func || !desc)
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{
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return;
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}
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auto &list = get_cmd_list();
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list.push_back({name, func, desc, complete});
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}
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stru_cmd *cmd_manager_get_commands(unsigned int *out_count)
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{
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auto &list = get_cmd_list();
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if (out_count)
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{
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*out_count = (unsigned int)list.size();
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}
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if (list.empty())
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{
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return NULL;
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}
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return list.data();
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}
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stru_cmd *cmd_find(const char *name)
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{
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if (!name)
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{
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return NULL;
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}
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auto &list = get_cmd_list();
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for (auto &cmd : list)
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{
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if (0 == strcmp(cmd.name, name))
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{
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return &cmd;
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}
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}
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return NULL;
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}
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void cmd_complete(const char *buf, char ***completions, int *ncomp)
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{
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auto &list = get_cmd_list();
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/* 判断是否有空格 —— 有空格则进入子命令补全 */
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const char *space = strchr(buf, ' ');
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if (space)
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{
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size_t cmd_len = (size_t)(space - buf);
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for (auto &cmd : list)
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{
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if (0 == strncmp(cmd.name, buf, cmd_len) && '\0' == cmd.name[cmd_len])
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{
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if (cmd.complete)
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{
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cmd.complete(buf, completions, ncomp);
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return;
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}
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break;
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}
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}
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*ncomp = 0;
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*completions = NULL;
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return;
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}
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/* 无空格：命令名前缀匹配 */
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int cnt = 0;
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char **c = NULL;
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for (auto &cmd : list)
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{
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if (!strncmp(cmd.name, buf, strlen(buf)))
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{
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if (!c)
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{
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c = (char **)malloc(sizeof(char *) * (list.size() + 1));
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}
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c[cnt] = strdup(cmd.name);
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cnt++;
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}
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}
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if (!c)
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{
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*ncomp = 0;
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*completions = NULL;
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}
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else
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{
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*ncomp = cnt;
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*completions = c;
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}
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}
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void cmd_sub_complete(const char *buf, char ***completions, int *ncomp,
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const char **subs, int sub_count)
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{
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const char *prefix = strrchr(buf, ' ');
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if (!prefix)
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{
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*ncomp = 0;
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*completions = NULL;
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return;
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}
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prefix++;
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int cnt = 0;
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char **c = NULL;
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size_t prefix_len = strlen(prefix);
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for (int i = 0; i < sub_count; i++)
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{
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if (0 == strncmp(subs[i], prefix, prefix_len))
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{
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if (!c)
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{
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c = (char **)malloc(sizeof(char *) * (size_t)(sub_count + 1));
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}
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c[cnt] = strdup(subs[i]);
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cnt++;
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}
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}
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*completions = c;
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*ncomp = cnt;
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}
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void cmd_help(int argc, char *argv[])
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{
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(void)argc;
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(void)argv;
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auto &list = get_cmd_list();
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for (auto &cmd : list)
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{
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printf("%-24s [%s]\n", cmd.name, cmd.desc);
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}
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}
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/* ===== 内置 linenoise ===== */
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#define SAFE_WRITE(fd, buf, sz) \
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do \
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{ \
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ssize_t _r = write(fd, buf, sz); \
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(void)_r; \
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} while (0)
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static char *g_history[100];
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static int g_history_len = 0;
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static void (*g_completion_cb)(const char *, char ***, int *) = NULL;
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static struct termios g_orig_termios;
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static int g_raw_enabled = 0;
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static void disable_raw(void)
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{
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if (!g_raw_enabled)
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{
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return;
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}
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &g_orig_termios);
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g_raw_enabled = 0;
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}
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static void sigint_handler(int sig)
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{
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(void)sig;
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if (g_raw_enabled)
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{
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disable_raw();
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}
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printf("\n");
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exit(0);
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}
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static int enable_raw(void)
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{
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signal(SIGINT, sigint_handler);
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tcgetattr(STDIN_FILENO, &g_orig_termios);
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atexit(disable_raw);
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struct termios raw = g_orig_termios;
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raw.c_lflag &= ~(ECHO | ICANON);
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raw.c_cc[VMIN] = 1;
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raw.c_cc[VTIME] = 0;
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int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
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if (0 == ret)
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{
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g_raw_enabled = 1;
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}
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return ret;
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}
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static int linenoise_edit(char *buf, int bufsize, const char *prompt)
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{
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int pos = 0;
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int len = 0;
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memset(buf, 0, (size_t)bufsize);
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SAFE_WRITE(STDOUT_FILENO, prompt, strlen(prompt));
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int history_idx = g_history_len;
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while (1)
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{
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char c;
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ssize_t n = read(STDIN_FILENO, &c, 1);
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if (n <= 0)
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{
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return -1;
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}
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if (c == '\n' || c == '\r')
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{
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buf[len] = '\0';
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SAFE_WRITE(STDOUT_FILENO, "\n", 1);
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return len;
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}
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if (c == 127 || c == '\b')
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{
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if (len > 0)
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{
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len--;
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pos--;
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buf[len] = '\0';
|
||||
SAFE_WRITE(STDOUT_FILENO, "\b \b", 3);
|
||||
history_idx = g_history_len;
|
||||
}
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
if (c == 27)
|
||||
{
|
||||
char seq[2];
|
||||
|
||||
if (read(STDIN_FILENO, &seq[0], 1) == -1)
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
if (read(STDIN_FILENO, &seq[1], 1) == -1)
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
if (seq[0] == '[')
|
||||
{
|
||||
if (seq[1] == 'A')
|
||||
{
|
||||
if (g_history_len == 0)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
history_idx--;
|
||||
|
||||
if (history_idx < 0)
|
||||
{
|
||||
history_idx = 0;
|
||||
}
|
||||
|
||||
const char *hist = g_history[history_idx];
|
||||
|
||||
strncpy(buf, hist, (size_t)(bufsize - 1));
|
||||
len = pos = (int)strlen(buf);
|
||||
SAFE_WRITE(STDOUT_FILENO, "\r\033[K", 4);
|
||||
SAFE_WRITE(STDOUT_FILENO, prompt, strlen(prompt));
|
||||
SAFE_WRITE(STDOUT_FILENO, buf, (size_t)len);
|
||||
}
|
||||
else if (seq[1] == 'B')
|
||||
{
|
||||
if (g_history_len == 0)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
history_idx++;
|
||||
|
||||
if (history_idx >= g_history_len)
|
||||
{
|
||||
history_idx = g_history_len;
|
||||
memset(buf, 0, (size_t)bufsize);
|
||||
len = pos = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
const char *hist = g_history[history_idx];
|
||||
|
||||
strncpy(buf, hist, (size_t)(bufsize - 1));
|
||||
len = pos = (int)strlen(buf);
|
||||
}
|
||||
|
||||
SAFE_WRITE(STDOUT_FILENO, "\r\033[K", 4);
|
||||
SAFE_WRITE(STDOUT_FILENO, prompt, strlen(prompt));
|
||||
SAFE_WRITE(STDOUT_FILENO, buf, (size_t)len);
|
||||
}
|
||||
}
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
if (c == 9)
|
||||
{
|
||||
char **completions = NULL;
|
||||
int ncomp = 0;
|
||||
|
||||
if (g_completion_cb)
|
||||
{
|
||||
g_completion_cb(buf, &completions, &ncomp);
|
||||
|
||||
if (ncomp > 0)
|
||||
{
|
||||
char *last_space = NULL;
|
||||
|
||||
for (int i = pos - 1; i >= 0; i--)
|
||||
{
|
||||
if (' ' == buf[i])
|
||||
{
|
||||
last_space = &buf[i];
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (last_space)
|
||||
{
|
||||
int keep_len = (int)(last_space - buf + 1);
|
||||
|
||||
strncpy(last_space + 1, completions[0],
|
||||
(size_t)(bufsize - keep_len - 1));
|
||||
buf[bufsize - 1] = '\0';
|
||||
}
|
||||
else
|
||||
{
|
||||
strncpy(buf, completions[0], (size_t)(bufsize - 1));
|
||||
}
|
||||
|
||||
len = pos = (int)strlen(buf);
|
||||
SAFE_WRITE(STDOUT_FILENO, "\r\033[K", 4);
|
||||
SAFE_WRITE(STDOUT_FILENO, prompt, strlen(prompt));
|
||||
SAFE_WRITE(STDOUT_FILENO, buf, (size_t)len);
|
||||
|
||||
for (int j = 0; j < ncomp; j++)
|
||||
{
|
||||
free(completions[j]);
|
||||
}
|
||||
|
||||
free(completions);
|
||||
}
|
||||
}
|
||||
|
||||
history_idx = g_history_len;
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
if (len < bufsize - 1)
|
||||
{
|
||||
buf[len++] = c;
|
||||
pos++;
|
||||
SAFE_WRITE(STDOUT_FILENO, &c, 1);
|
||||
history_idx = g_history_len;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
char *linenoise(const char *prompt)
|
||||
{
|
||||
char buf[1024];
|
||||
|
||||
if (0 != enable_raw())
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int n = linenoise_edit(buf, (int)sizeof(buf), prompt);
|
||||
|
||||
disable_raw();
|
||||
|
||||
if (n <= 0)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
char *copy = strdup(buf);
|
||||
|
||||
return copy;
|
||||
}
|
||||
|
||||
void linenoiseFree(void *ptr)
|
||||
{
|
||||
free(ptr);
|
||||
}
|
||||
|
||||
int linenoiseHistoryAdd(const char *line)
|
||||
{
|
||||
if (g_history_len >= 100)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
g_history[g_history_len] = strdup(line);
|
||||
g_history_len++;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
void linenoiseHistoryFree(void)
|
||||
{
|
||||
for (int j = 0; j < g_history_len; j++)
|
||||
{
|
||||
free(g_history[j]);
|
||||
}
|
||||
}
|
||||
|
||||
void lineniseSetCompletionCallback(void (*cb)(const char *, char ***, int *))
|
||||
{
|
||||
g_completion_cb = cb;
|
||||
}
|
||||
|
||||
} /* extern "C" */
|
||||
Loading…
Reference in New Issue