basic.h

操作系统中 进程撤销试验模拟 开发环境c语言

#ifndef basic_h

	#include<stdio.h>
	#include<string.h>
	#include<stdlib.h>
	#define basic_h
	char *errormsg[256];
	//process control block
	struct pcb
	{
		int pid; //process id
		int ppid; //parent process id
		int prio; //priority
		int state; //state
		int dflag; //diaoduxinxi
		int lasttime; //last execute time
		int tottime; //totle execute time
	};
	//process node
	struct pnode
	{
		pcb *node;
		pnode *sub;
		pnode *brother;
		pnode *next;
	};

	//信号量
	struct semphore
	{
		char name[5]; //名称
		int count; //计数值
		int curpid; //当前进程id
		pnode *wlist; //等待列表
	};

	#define geterror(eno) printf("%s\n",errormsg[eno])

	void initerror()
	{
		errormsg[0] = (char *)malloc(20);
		errormsg[0]="error command!";
		errormsg[1] = (char *)malloc(20);
		errormsg[1]="error parameter!";
	}
	//get a substring in string s
	char * substr(char *s,int start,int end)
	{
		char *s1;
		int len = strlen(s);
		if(start<0 || end>=len || start>end)
		return NULL;
		s1=(char *)malloc(end-start+2);
		for(int i=0;i<=end-start;i++)
		s1[i] = s[i+start];
		s1[i]='\0';
		return s1;
	}
	//find the location of c in string s
	int instr(char *s,char c)
	{
		int i;
		for(i=0;i < strlen(s);i++)
		if(s[i]==c)
		return i;
		return -1;
	}
	//change the string to array data
	int * strtoarray(char *s)
	{
		int *a,count,i,x1;
		char c, *s1,*s2;
		if(!s)
		{
			printf("string can't be null!\n");
			return NULL;
		}
		count=0;
		s1=s;
		for(i=0;i<strlen(s1);i++)
		{
			if(s1[i]==',')
			count++;
		}
		count++;
		a = (int *)malloc(count);
		c=',';
		for(i=0;i<count;i++)
		{
			x1 = instr(s1,c);
			if(x1>=0)
			{
				s2=substr(s1,0,x1-1);
			}
			else
			{
				s2=s1;
			}
			a[i]=atoi(s2);
			if(c==',')
			{
				s1=substr(s1,x1+1,strlen(s1)-1);
			}
		}
		return a;
	}

#endif