怎样做一个linux的CLI（command line interface）？__char_command_static_name_int_

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怎样做一个linux的CLI（command line interface）？

来源: 互联网发布时间：2016-02-26

本文导语: 我想做一个telnet的登陆界面，就像cisco路由器一样，用户登陆后只能使用指定的命令，请问有谁做过？怎么做？我用的是Linux，Linux本身的用户登陆时会指定执行某种shell，比如/bin/sh，我是想做一个替换他，比如/bin/myc...

我想做一个telnet的登陆界面，就像cisco路由器一样，用户登陆后只能使用指定的命令，请问有谁做过？怎么做？
我用的是Linux，Linux本身的用户登陆时会指定执行某种shell，比如/bin/sh，我是想做一个替换他，比如/bin/mycli。

算了，直接上代码
#include
#include
#include
#include
#include
#include
#include
/* The maximum number of command's args */
#define MAX_ARGVS 16
/* The maximum size of command */
#define MAX_CMD_SIZE 50
/******************************************************************************
An entry in the console command list consists of a command name and its
entry point.
******************************************************************************/
typedef int executable(int argc, char **argv);
typedef struct {
    char *name;
    executable *entry;
} cmd_t;
/******************************************************************************
Command prototypes
******************************************************************************/
static int help(int argc, char **argv);
static int SystemCall(int argc, char **argv);
static int cd(int argc, char **argv);
/******************************************************************************
List of all console commands.
******************************************************************************/
static cmd_t cmd_list[] = {
    {"help", (executable *) help},
    {"q", (executable *) exit},
    {"exit", (executable *) exit},
    {"quit", (executable *) exit},
    {"$", SystemCall},
    {"cd", cd},
    {NULL, NULL}
};
/******************************************************************************
Search for a console command with matching name in the console command list.
Return 0 if not found.
******************************************************************************/
static cmd_t *GetEntry(char *name)
{
    cmd_t *p = cmd_list;
    int i;
    for (i = 0; cmd_list[i].name != NULL; i++, p++)
        if (strcmp(name, p->name) == 0)
            return p;
    return 0;
}
static char *command_generator(char *text, int state)
{
    static int list_index, len;
    char *name;
    /* If this is a new word to complete, initialize now.  This includes
       saving the length of TEXT for efficiency, and initializing the index
       variable to 0. */
    if (!state) {
        list_index = 0;
        len = strlen(text);
    }
    /* Return the next name which partially matches from the command list. */
    while ((name = cmd_list[list_index].name)) {
        list_index++;
        if (strncmp(name, text, len) == 0)
            return (g_strdup(name));
    }
    /* If no names matched, then return NULL. */
    return ((char *) NULL);
}
static char **command_completion(char *text, int start, int end)
{
    char **matches;
    matches = (char **) NULL;
    /* If this word is at the start of the line, then it is a command
       to complete.  Otherwise it is the name of a file in the current
       directory. */
    if (start == 0)
        matches = (char**)completion_matches(text, command_generator);
    return (matches);
}
static void initialize_readline()
{
    /* Allow conditional parsing of the ~/.inputrc file. */
    rl_readline_name = "FileMan";
    /* Tell the completer that we want a crack first. */
    rl_attempted_completion_function = (CPPFunction *) command_completion;
}
static void execute_line(char *line)
{
    cmd_t *pcmd;
    int argc = 0;
    char *argv[MAX_ARGVS];
    char *q = strtok(line, " ");
    while (1) {
        if (q == 0)
            break;
        argv[argc++] = q;
        q = strtok(0, " ");
    }
    /* Look for the command in the console command list */
    pcmd = GetEntry(line);
    if (pcmd == 0) {
        printf("Bad Command! n");
        printf("Type "help" to get helpn");
    } else {
        pcmd->entry(argc, argv);
    }
}

int main()
{
    printf("***************************************************************n");
    printf("                         CONSOLE                               n");
    printf("***************************************************************n");
    printf("To get help, please type "help"n");
    char *line, *s;
    initialize_readline();
    while (1) {
        line = readline("> ");
        if (!line)
            break;
        s = g_strstrip(line);
        if (*s) {
            add_history(s);
            execute_line(s);
        }
    }
    return 0;
}
/*****************************************************************************
*command help
*The "help" command do nothing but just print the command and it's argvs
*****************************************************************************/
static int help(int argc, char **argv)
{
    if (argc