readfile.c

简单的词法分析器在Linux上用C语言实现

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

#include"option.h"
#include"readfile.h"

void readline()
{
	int i=0;
	while((line[i]=fgetc(source))!='\n'&&(line[i]!=EOF))
	{
		i++;
	}
	line[i]='\0';
	pchar=line;
	fline++;
}

int readchar()
{
	int annotation=0;
	char ch;
	if((*pchar)=='\0')
	{
		readline();
	}
	if(strstr(pchar,"/*"))
	{
		while(!feof(source))
		{
			if(strstr(pchar,"*/"))
			{
				readline();
				annotation=1;
				break;
			}
			readline();
		}
		if(!annotation)
			fprintf(stderr,"Annotation is not found line:%d\n",fline);
	}
	ch=*pchar;
	pchar++;
	return ch;
}