c语言模仿bash的程序

伪bash:半成品

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define CMDMAX 7
#define LOG_W(fmt, args...) printf("\033[33m[Main][%s@%d]:\033[0m" fmt , __func__, __LINE__, ## args)

struct mybash_obj;
struct cmd_object;

struct cmd_object{
	char cmd[32];
	int (*func)(struct mybash_obj *pbash);
};
struct mybash_obj{
	char *curdir;
	char *cmd;
	char *param1;
	void (*init)(struct mybash_obj*);
	void (*exit)(struct mybash_obj*);
	void (*parse)(char *str, struct mybash_obj*);
	int  (*mach_cmd)(int num, struct mybash_obj*);
	void (*exec_cmd)(int num, struct mybash_obj*);
	struct cmd_object *cmdobj;
};

int fileis(char *path, char *name)
{
  DIR *dir;
  if ((dir=opendir(path)) == 0)
	  return -1;
 
  struct dirent *stdinfo;
 
	while ((stdinfo=readdir(dir))) {
  		if(!strcmp(stdinfo->d_name, name))
			return stdinfo->d_type;
	}
  closedir(dir);   // 关闭目录指针
  return 0;
}

int lsfunc(struct mybash_obj *p)
{
  DIR *dir;
  if ((dir=opendir(p->curdir)) == 0)
	  return -1;
 
  struct dirent *stdinfo;
 
  while ((stdinfo=readdir(dir)))
  {
	switch(stdinfo->d_type) {
		case DT_DIR:
			printf("DIR        %s\n", stdinfo->d_name); //目录
			break;
		case DT_REG:
			printf("REGFILE    %s\n", stdinfo->d_name); //普通文件
			break;
		delault:
			//man readdir
			break;
	}
  }
 
  closedir(dir);   // 关闭目录指针
}

int cdfunc(struct mybash_obj *pbash)
{
	//LOG_W("cd func\n");
	int len = strlen(pbash->curdir);
	int i;
	int ret = -1;
	if(!strcmp(pbash->param1, "..")) {
		if(strcmp(pbash->curdir, "/")) {
			for(i=len-1; pbash->curdir[i] != '/'; i--) {
				pbash->curdir[i] = '\0';
			}
			if(i != 0)
			pbash->curdir[i] = '\0';
		}
	} else if (!strcmp(pbash->param1, ".")) {
	} else{
		ret = fileis(pbash->curdir, pbash->param1);
		if(ret == DT_DIR) {
			if(strcmp(pbash->curdir, "/"))
				strcat(pbash->curdir, "/");
			strcat(pbash->curdir, pbash->param1);
		} else {
			printf("No such Dir\n");
		}
	}
	LOG_W("currnet dir is %s\n", pbash->curdir);
	return 0;
}



int pwdfunc(struct mybash_obj *pbash)
{
	printf("no nothing todo\n");
}
int putsfunc(struct mybash_obj *pbash)
{
	printf("no nothing todo\n");
}
int getsfunc(struct mybash_obj *pbash)
{
	printf("no nothing todo\n");
}
int rm(struct mybash_obj *pbash)
{
	printf("no nothing todo\n");
}
int mkdir(struct mybash_obj *pbash)
{
	printf("no nothing todo\n");
}

void initbash(struct mybash_obj *p)
{
	char *path;
	path=getcwd(NULL,0);
	LOG_W("th pathis %s\n", path);
	p->curdir = (char *)malloc(512 * sizeof(char));
	p->cmd = (char *)malloc(64 * sizeof(char));
	p->param1 = (char *)malloc(128 * sizeof(char));
	memset(p->curdir, 0, 512 * sizeof(char));
	strcpy(p->curdir, path);
	free(path);
	printf("bash init \n");
}

void exitbash(struct mybash_obj* p)
{
	free(p->curdir);
	free(p->cmd);
	free(p->param1);
	printf("bash exit \n");
}

void parsefunc(char *str, struct mybash_obj* p)
{
	memset(p->cmd, 0, sizeof(p->cmd));
	memset(p->param1, 0, sizeof(p->param1));
	sscanf(str, "%s %s", p->cmd, p->param1);
//	LOG_W("cmd is (%s), param1 is (%s)\n", p->cmd, p->param1);
}
int  mach_cmdfunc(int num, struct mybash_obj* p)
{
	if(strcmp((p->cmdobj[num]).cmd, p->cmd))
		return 0;
	else
		return 1;
}

void exec_cmd_func(int num, struct mybash_obj *pbash)
{
	pbash->cmdobj[num].func(pbash);
}



struct cmd_object cmd_obj[CMDMAX]= {
	{"cd", cdfunc},
	{"ls", lsfunc},
	{"pwd", pwdfunc},
	{"puts", putsfunc},
	{"gets", getsfunc},
	{"rm", rm},
	{"mkdir", mkdir}
};
struct mybash_obj bashobj = {
	.init = initbash,//初始化伪bash
	.exit = exitbash,//退出伪bash
	.parse = parsefunc,//解析用户的输入，解析成为本个结构体的char *cmd和char *param1;cmd是命令，param1是参数比如cd word，cmd是"cd", param1是"work"
	.mach_cmd = mach_cmdfunc,//匹配与命令，返回命令表的索引，命令表是cmd_obj[CMDMAX]；
	.exec_cmd = exec_cmd_func,//执行相对应索引的命令
	.cmdobj = cmd_obj//命令表
};

int main()
{
	char str[512] = "";
	int i;
	char ch;
	bashobj.init(&bashobj);
	while(1) {
		memset(str, 0, sizeof(str));
		printf("$: ");
		scanf("%[^\n]", str);
		getchar();
		bashobj.parse(str, &bashobj);
		for(i=0; i < CMDMAX; i++) {
			if(bashobj.mach_cmd(i, &bashobj)) {
				bashobj.exec_cmd(i,&bashobj);
			}
		}
	}
	bashobj.exit(&bashobj);
	return 0;
}

只实现了两个命令，ls和cd，