基于C语言的NMEA-0183解析程序（四）

实现条件筛选容错输入

#ifndef _CONDITION_H_
#define _CONDITION_H_

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>

/******************************************************************************
 *  Function    -  Location state condition fault tolerant input
 *
 *  Purpose     -  定位状态筛选条件容错输入
 *
 *  Description -  定位是否有效
 *
 * modification history
 * ----------------------------------------
 * v1.0  , 2018-12-27,  zhanglixv  written
 * ----------------------------------------
 ******************************************************************************/
char Condition_Locate(void)
{
	char avhemi_;
	printf("是否有效定位(A/V/C):");
	while (1)
	{
		scanf("%c", &avhemi_);
		if (!isalpha(avhemi_))
		/*if (!scanf("%c", &avhemi_))*/
		{
			printf("The condition data you input is illegal.Please input a alphabet:");
			while (getchar() != '\n');
		}
		else if (!isupper(avhemi_))/*islower(avhemi_)*/
		{
			printf("The alphabet you input is lower case.Please input a upper case:");
			while (getchar() != '\n');
		}
		else if ((avhemi_ != 'A') && (avhemi_ != 'V') && (avhemi_ != 'C'))
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else
		{
			setbuf(stdin, NULL);
			break;
		}
	}
	return avhemi_;
}

/******************************************************************************
 *  Function    -  Speed threshold condition fault tolerant input
 *
 *  Purpose     -  速度阈值筛选条件容错输入
 *
 *  Description -  +/-：大于/小于
 *
 * modification history
 * ----------------------------------------
 * v1.0  , 2018-12-26,  zhanglixv  written
 * ----------------------------------------
 ******************************************************************************/
float Condition_Speed(void)
{
	float speed_;
	printf("定位物体速度阈值(+/-):");
	while (1)
	{
		if (!scanf("%f", &speed_))/*字母开头,返回0，非0为1*/
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');/*等待回车结束输入*/
		}
		else if (getchar() != '\n')/*数字开头后面没接回车//继续输入字符变量*/
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else if (speed_ < 0)/*数字开头后接回车//负数*/
			printf("The condition data you input is illegal.Please input again:");
		else
		{
			setbuf(stdin, NULL);/*使stdin输入流由默认缓冲区转为无缓冲区*/
			break; /*数字开头后接回车(正数)*/
		}
	}
	return speed_;
}

/******************************************************************************
 *  Function    -  Positioning satellite number condition fault tolerant input
 *
 *  Purpose     -  定位卫星颗数筛选条件容错输入
 *
 *  Description -  +/-：大于/小于
 *
 * modification history
 * ----------------------------------------
 * v1.0  , 2018-12-26,  zhanglixv  written
 * ----------------------------------------
 ******************************************************************************/
int Condition_Svnum(void)
{
	int svnum_;
	printf("参与定位卫星颗数(+/-):");
	while (1)
	{
		if (!scanf("%d", &svnum_))
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else if (getchar() != '\n')
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else if (svnum_ < 0)
			printf("The condition data you input is illegal.Please input again:");
		else
		{
			setbuf(stdin, NULL);
			break;
		}
	}
	return svnum_;
}

/******************************************************************************
 *  Function    -  Satellite signal to noise ratio condition fault tolerant input
 *
 *  Purpose     -  卫星信号强度筛选条件容错输入
 *
 *  Description -  +/-：大于/小于(dB)
 *
 * modification history
 * ----------------------------------------
 * v1.0  , 2018-12-26,  zhanglixv  written
 * ----------------------------------------
 ******************************************************************************/
int Condition_Sn(void)
{
	int sn_;
	printf("卫星信号强度阈值(+/-):");
	while (1)
	{
		if (!scanf("%d", &sn_))
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else if (getchar() != '\n')
		{
			printf("The condition data you input is illegal.Please input again:");
			while (getchar() != '\n');
		}
		else if (sn_ < 0)
			printf("The condition data you input is illegal.Please input again:");
		else
		{
			setbuf(stdin, NULL);
			break;
		}
	}
	return sn_;
}

#endif // _CONDITION_H_