C语言编写行编辑器

在这里插入代码片
```//行编辑器 
#include
#include
#include

#define MAXLEN 256   //每行存储字符数

void openFile();
void closeFile();
void saveFile();
void listLines();
void gotoLine();
void insertString();
void deleteString();
void showHelp();
void countLine();
void enterFileNmae();
void clearBuffer();
void interPosition(int *,int *);


char fname[256]="";
char (*buf)[MAXLEN]=NULL;
int lines=0;

//菜单
int main()
{
char cmd[20];
while(1)
		{
		printf("comand:");
		scanf("%s",cmd);
		
		if(strcmp(cmd,"fopen")==0)   		openFile();
		else  if(strcmp(cmd,"fcolse")==0)   closeFile();
		else if(strcmp(cmd,"fsave")==0)     saveFile();
		else if(strcmp(cmd,"list")==0) 		listLines();
		else if(strcmp(cmd,"gotoln")==0) 	gotoLine();
		else if(strcmp(cmd,"inss")==0) 		insertString();
		else if(strcmp(cmd,"dels")==0) 		deleteString();
		else if(strcmp(cmd,"help")==0) 		showHelp();
		else if(strcmp(cmd,"exit")==0) 		break;
		else								printf("%s?n",cmd);	//输入错误命令时处理； 
		}	
		clearBuffer();
		return 0; 
} 

//文件名输入
void enterFileNmae()
{
	printf("filename:");
	scanf("%s",fname);
}
//文件中数据行的数计算 
void countLines()
{
	FILE *fp;
	char s[MAXLEN];
	lines=0;
	fp=fopen(fname,"r");//读取模式
	if(fp==NULL)	return ;
	while(fgets(s,MAXLEN-1,fp))
	{
		lines++;
		printf("m=%dn",lines);
		fclose(fp);	
	}	
}
//指针变量，文件名以及行数的初始化 
void clearBuffer()
{
	fname[0]='';//文件名是空的 
	lines=0;
	if(buf)	free(buf);
	buf=NULL;
}

//分配内存，读入文件
void openFile()
{
	int n=0;
	FILE *fp;
	char *myline;
	enterFileNmae();
	countLines();
	//countLine();
	buf=(char(*)[MAXLEN])malloc(sizeof(char) * lines * MAXLEN);
	if(!buf) 	return ;
	fp=fopen(fname,"r");
	if(fp=NULL)
		{
			clearBuffer();
			return ;
		}
	while(fgets(buf[n],MAXLEN-1,fp))
		{
			myline=buf[n];//数据复制到缓存单元中
			myline[strlen(myline-1)]='';
			n++; 
		}
		fclose(fp);
		printf("读入%d行。n",lines);
} 

//内存释放 
void closeFile()
{
	char ans[20]=" ";
	printf("是否保存？(Y or N)");
	scanf("%s",ans);
	if(ans[0]=='y') saveFile();
	clearBuffer();
	printf("以释放内存。n"); 
}
//保存文件 
void saveFile()
{
	int n;
	FILE *fp;
	
	enterFileNmae();	//input the file name;
	fp=fopen(fname,"w") ; //writing 
	if(fp==NULL) return ;
	for(n=0;n= lines)	//检查变量row的数值范围。
		return;
	characters = strlen(buf[row]);
	
	printf("位数:");
	scanf("%d", &col);
	if(col <0 ||col >= characters)		//检查变量co1的数值范围。
		return;
	*prow = row;
	*pcol = col;
} 
//字符串的插入
void insertString()
{

	int row, col;			//行号.位数
	char insstr[MAXLEN];	//待插入的字符串
	char newstr [MAXLEN];	//插入后的字符串
	char *myline;			//目标行
	interPosition(&row, &col);
	myline = buf[row];
	printf("插入字符串:");
	scanf("&s",insstr);
	
	if(strlen(myline) + strlen(insstr) >= MAXLEN)
		return;
		
	sprintf (newstr, "%s%s",insstr, myline + col);

	strcpy (myline + col, newstr);
	printf("第&d行第&d个字符后插入"&s"n", row, col, insstr);
	printf("&04d:8sn", row, myline);
}

//字符串的删除
 void deleteString()
 {
 
	int row, col;
	//行号,位数
	int delnum;
	//删除的字符串数
	
	char *myline;	 //目标行
	int mylength; 	// 目标行字符串的长度
	int i	;		//计数器
	//interPosition(int *prow,int *pcol);
	interPosition(&row, &col);
	myline = buf[ row];
	mylength = strlen (myline);
	printf("字符数:");
	scanf("&d", &delnum);
	if(delnum <= 0 || mylength < col + delnum)	//检查删除字符数的数值范围。
	return;
	for(i = col; i <= mylength - delnum; i++)	//删除指定字符。
		myline[i] = myline[i + delnum];
	printf("从第%d行的第%d个字符后开始删除%d个字符。n", row, col,delnum);
	printf("%04d:%sn",row,myline);//行,线)
}
//帮助信息的显示
 void showHelp()
{

	printf(" COMMAND HELP 		:"help"n");
 	printf( "LOAD FILE			:"fopen"n") ;
	printf("RELEASE BUFFER		:"fclose"n");
	printf("SAVE FILE			:"fsave"n");
	printf("SHOW ALL LINES 		:"list"n");
	printf("SHOW SINGLE LINE 	:"gotoln"n");
	printf ("INSERT STRING		:"inss"n");
	printf("DELETE STRING		:"dels"n");
}