增加判断避免调用fread()缓冲区溢出

sms.c

@@ -2,7 +2,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
-#include <time.h>  //时间库函数
+#include <time.h> //时间库函数
 
 int class_num = 0; //初始班次总数为0
 
@@ -44,9 +44,8 @@ void Menu()
 	struct tm *timeinfo;
 	time(&rawtime);
 	timeinfo = localtime(&rawtime);
-	printf("系统当前时间：%d：%d\n", timeinfo->tm_hour, timeinfo->tm_min);
+	printf("			    系统当前时间：%d：%d\n", timeinfo->tm_hour, timeinfo->tm_min);
 	int InputNumber;
-	printf("/*				当前班次信息：				*/\n");
 	printf("/*				1、购票					*/\n");
 	printf("/*				2、退票					*/\n");
 	printf("/*				3、查询路线				*/\n");
@@ -62,7 +61,7 @@ void Menu()
 		{
 		default:
 			system("cls");
-			printf("请输入正确选项！！\n");
+			printf("输入错误，请输入正确的选项！！\n");
 			system("pause");
 			Menu();
 			break;
@@ -107,7 +106,7 @@ void Scanf(int i, int j) //
 		else
 		{
 			printf("输入错误!\n");
-			system("pause"); 
+			system("pause");
 		}
 	}
 	printf("请输入起点站:\n");
@@ -136,15 +135,19 @@ void Save() //
 	FILE *fp1, *fp2;
 	if ((fp1 = fopen("sql.txt", "wb")) == NULL)
 	{
-		printf("车次数据文件不存在\n");
+		printf("车次数据文件不存在，请先录入数据\n");
-		exit(0);
+		system("pause");
+		Menu();
 	}
 	if ((fp2 = fopen("num.txt", "wb")) == NULL)
 	{
-		printf("车次序号数据文件不存在\n");
+		printf("车次序号数据文件不存在，请先录入数据\n");
-		exit(0);
+		system("pause");
+		Menu();
 	}
 	printf("数据保存中，请稍后\n");
+	fp2 = fopen("num.txt", "wb");
+	fp1 = fopen("sql.txt", "wb");
 	fwrite(&class_num, sizeof(int), 1, fp2); //写入文件信息
 	fwrite(records, sizeof(CLASS), class_num, fp1);
 	fclose(fp1);
@@ -153,29 +156,35 @@ void Save() //
 void Load() //加载数据文件
 {
 	FILE *fp1, *fp2;
-	if ((fp1 = fopen("sql.txt", "rb+")) == NULL)
+	if ((fp1 = fopen("sql.txt", "rb")) == NULL)
 	{
 		system("cls");
-		printf("车次数据文件不存在\n");
+		printf("车次数据文件不存在，请先录入数据\n");
 		system("pause");
-		exit(0);
+		Menu();
 	}
-	if ((fp2 = fopen("num.txt", "rb+")) == NULL)
+	if ((fp2 = fopen("num.txt", "rb")) == NULL)
 	{
 		system("cls");
-		printf("车次序号数据文件不存在\n");
+		printf("车次序号数据文件不存在，请先录入数据\n");
 		system("pause");
-		exit(0);
+		Menu();
 	}
+	fp1 = fopen("sql.txt", "rb");
+	fp2 = fopen("num.txt", "rb");
 	fread(&class_num, sizeof(int), 1, fp2);		   //读入信息
-	fread(records, sizeof(CLASS), class_num, fp1); //读入信息
+	if (sizeof(CLASS) > sizeof(class_num))
+	{
+		fread(records, sizeof(CLASS), class_num, fp1); //读入信息
+	}
 	fclose(fp1);
 	fclose(fp2);
 }
 int Judge(int i) //判断时间是否超出
 {
 	struct tm *local;	  //时间结构体
-	time_t t;			   //把当前时间给t
+	time_t t;
+	time(&t);
 	local = localtime(&t); //获取当前系统时间
 	if (local->tm_hour < atoi(records[i].hour) || local->tm_hour == atoi(records[i].hour) && local->tm_min < atoi(records[i].min))
 		//atoi函数将字符串转换成一个整数值
@@ -193,7 +202,7 @@ int FindCarByNum(char s1[]) //
 		{
 			printf("|----------|----------|----------|----------|--------|--------|--------|\n");
 			printf("|%10s|%5s:%-4s|%10s|%10s|%8.1f|%8d|%8d|", records[i].number, records[i].hour,
-				   records[i].min, records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
+				records[i].min, records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
 			h += 2;
 			break;
 		}
@@ -204,7 +213,6 @@ int FindCarByNum(char s1[]) //
 void Import()
 {
 	int i = 0, j = 5, h;
-	char s[5];
 	FILE *fp;
 	system("cls");
 	if ((fp = fopen("num.txt", "rb")) != NULL)
@@ -230,7 +238,7 @@ void Import()
 				scanf("%s", records[i].number);
 				for (h = 0; h < i; h++)
 					if (strcmp(records[h].number, records[i].number) == 0)
-					//判断字符串是否相等
+						//判断字符串是否相等
 					{
 						printf("输入错误!该班次已存在!\n");
 						break; ///返回
@@ -263,11 +271,12 @@ void Buy()
 		system("pause");
 		Query();
 		printf("请输入要订票的班次(若无请输入0):\n");
+		num[0] = '\0';
 		scanf("%s", num);
 		for (i = 0; i < class_num; i++)
 			if (strcmp(num, records[i].number) == 0)
 				if (records[i].max > records[i].bought && Judge(i) == 1)
-				//判断时间是否超出当前系统时间并且已售车票没超出最大客量
+					//判断时间是否超出当前系统时间并且已售车票没超出最大客量
 				{
 					records[i].bought++;
 					printf("通向%s班次为%s的票订票成功!\n", records[i].to, records[i].number);
@@ -326,7 +335,7 @@ void Refund()
 void Query()
 {
 	int i;
-	char s1[10] = {'\0'}, s2[10] = {'\0'};
+	char s1[10] = { '\0' }, s2[10] = { '\0' };
 	system("cls");
 	printf("1. 按班次查询\n");
 	printf("2. 按终点站查询\n");
@@ -367,7 +376,7 @@ void Find(char s1[], char s2[])
 		{
 			printf("\n|----------|----------|----------|----------|--------|--------|--------|\n");
 			printf("|%10s|%5s:%-4s|%10s|%10s|%8.1f|%8d|%8d|", records[i].number, records[i].hour, records[i].min,
-				   records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
+				records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
 			h += 2;
 			if (m == 1)
 				break;
@@ -392,7 +401,7 @@ void Insert()
 		scanf("%s", records[class_num].number);
 		for (i = 0; i < class_num; i++)
 			if (strcmp(records[class_num].number, records[i].number) == 0)
-			//判断车次是否重复
+				//判断车次是否重复
 			{
 				printf("输出车次已存在!\n");
 				system("pause");
@@ -418,11 +427,11 @@ void Exploer() //
 		printf("\n|----------|----------|----------|----------|--------|--------|--------|\n");
 		if (Judge(i))
 			printf("|%10s|%5s:%-4s|%10s|%10s|%8.1f|%8d|%8d|", records[i].number, records[i].hour,
-				   records[i].min, records[i].from, records[i].to, records[i].hours,
+				records[i].min, records[i].from, records[i].to, records[i].hours,
-				   records[i].max, records[i].bought);
+				records[i].max, records[i].bought);
 		else
 			printf("|%10s| 已发车 |%10s|%10s|%8.1f|%8d|%8d|", records[i].number,
-				   records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
+				records[i].from, records[i].to, records[i].hours, records[i].max, records[i].bought);
 	}
 	ShowTableFoot();
 	printf("\n");