#include "ysh.h"
#include "extern.h"

int getline(int fd,char *buf) /*按行讀取*/
{
	int i=0;
	char c;
	while (read(fd,&c,1)){
		buf[i++]=c;
		if (c=='\n'){
			buf[i-1]='\0';
			return i;
		}
	}
	return i;
}

void getenviron(int n,char *s)
{
	int i=0,j=0,k=0;
	char c,buff[80],*p;
	while ((c=s[i])!='='){
		buff[i++]=c;
	}
	buff[i++]='\0';
	if (strcmp(buff,"PATH")==0){
		while (s[i]!='\0'){
			if (s[i]==':'){ /*將以“：”分隔的查找路徑分別設置到envpath[]中*/
				buff[j++]='/';
				buff[j]='\0';
				p=(char *) malloc(strlen(buff)+1);
				strcpy(p,buff);
				envpath[k++]=p; /*將路徑保存在envpath[k]中*/
				envpath[k]=NULL; /*字符串尾置空*/
				j=0; /*為下一個envpath[i]作準備*/
				i++;
			}else {
				buff[j]=s[i];
				j++;
				i++;
			}
		}
	}
	else
		fprintf(stderr,"No match");
}

void init_environ()
{
	int fd,n,i;
	char buf[80];
	/*打開保存查找路徑的ysh_profile文件*/
	if ((fd=open("ysh_profile",O_RDONLY,660))==-1)
	{
		printf("init environ variable error\n");
		exit(1);
	}
	while (n=getline (fd,buf)){
		getenviron(n,buf); /*getenviron()函數*/
	}
	envhis.start=0; /*初始化history循環數組*/
	envhis.end=0;
	head=end=NULL; /*初始化jobs鏈表指針*/
}