preprocessor.c.old1

51模拟器 51模拟器 51模拟器

#include"gas51.h"
#include<string.h>
#define IS_NOT_DEFINED 0
#define IS_DEFINED 1

char dest[80];
char tmpnambuff[12]="gas51";

void gas51_perror();
char * include_file(char *arg,char *file,long pos);
int pat_index(char *,char *);
char * remove_all_spaces(char *);
int preprocess(char *file_to_preprocess)   //function to prprocess the assembly file...
{
	FILE *fp,newfp;
	char buff[80]={0},line[80],tempbuff[40];
	char *buff_cleaned,newfilebuff[20],*newfile;
	char directive_arg[15],directive_expansion[15],directive_name[15],directive_symbol[15]  ;
	int i,j,l;
	newfile=newfilebuff;
	fp=fopen(file_to_preprocess,"r");
	gas51_line_no = 0;
	strcpy(newfilebuff,file_to_preprocess);
	while( fgets(buff,80,fp) )  {
		gas51_line_no++;
		for(i=0;i<=strlen(buff);i++)
		{	
		    if(buff[i]==';')
		    	break;	    
		}
		buff[i]='\0' ;

            if(pat_index(buff,"#include")) /****EXTREMELY IMPORTANT!!!  there must be NO SPACE BETWEEN the '#' and 'include' ...**/
			{
			buff_cleaned = remove_all_spaces(buff) ;
   			for(i=9,j=0;i<=strlen(buff_cleaned);i++,j++) // in this case filename starts from 10th location or 9th index...
				directive_arg[j]=buff_cleaned[i] ;			
			directive_arg[strlen(directive_arg)-1] = '\0' ;  //to replace the last '>' with NULL...
			
			include_file(directive_arg,newfile,ftell(fp));   
			fclose(fp);
			fp=fopen(tmpnambuff,"r");
			//tmpnambuff[strlen(tmpnambuff)-6]='\0';
			newfile=tmpnambuff;
			}
	
			
	    else
            	if(pat_index(buff,"#define")) /****EXTREMELY IMPORTANT!!!  there must be NO SPACE BETWEEN the '#' and 'define' ...**/

	    	{

			
	    	}
	
	
	
	}
}


int pat_index(char *src_str,char *substr)

{
	int i=0,j=0,k=0,retval=0;
	int len_substr , len_src_str ;
	char temp_str[10];
	len_substr = strlen(substr) ;
	len_src_str = strlen(src_str) ;
	for(i=0;i<(len_src_str - len_substr);i++)    {    
	
	for(j=0,k=i;k<i+len_substr;j++,k++)  {
		temp_str[j]=src_str[k] ;
	}
	
	temp_str[j] = '\0' ;
	if(!strcmp(temp_str,substr))
	{
		retval=i+1;  //we have to increment i here coz arrays start with 0 but column no. in
		break;	     //a file starts with 1...	
	}
	else 
		retval=0;	
	
	
	}
 			

return retval;

}




char * include_file(char *file_to_include,char *newfile, long pos)
{

	FILE *fpsrc,*fptemp,*fpdest;
	
  	int i=0,newfd;
	
	char *fname1, *fname2 ,buff[80] ,tempbuff[40];//tempnambuff[12]="gas51XXXXXX";
	
	char *retptr;
	char const1[]="/usr/include/gas51/" ;
	
	//extern int gas51_sys_errlist[100];
	char const2[]="./" ;
	
	fname1=strcat(const1 ,file_to_include)  ;
	
	fname2=strcat(const2 ,file_to_include) ;

	// fptemp points to .asm file, fpdest points to .asm.tmp file,

	if ( ((fpsrc=fopen(fname1 ,"r")) )  ||  ( (fpsrc=fopen(fname2,"r")) ))
	{
       		// code to include file contents goes here...
		
		fptemp=fopen(newfile,"r");
		tmpnambuff[strlen(tmpnambuff)-6]='\0';
		newfd=mkstemp(strcat(tmpnambuff,"XXXXXX"));
		retptr=tmpnambuff;
		//newname = tmpnam(tempbuff);
		//strcpy(tempbuff,newfile);
		//strcat(tempbuff,".tmp");
		//fpdest=fopen(tempbuff,"w");
		fpdest=fdopen(newfd,"w");
		while(1)
		{
			fgets(buff,80,fptemp) ;
			if(  (ftell(fptemp)) == pos  )
				break;
			else
				fprintf(fpdest,"%s",buff);
	
		}
		
		
		//fseek(fptemp,pos,SEEK_SET);
		
		
		while( fgets(buff,80,fpsrc)  )
		{
			fprintf(fpdest,"%s",buff);
				
		}
			
		
		fseek(fptemp,pos,SEEK_SET);

		
		while( fgets(buff,80,fptemp)  )
		{
			fprintf(fpdest,"%s",buff);
				
		}
		
			
		fclose(fpsrc);
		fclose(fpdest);
		fclose(fptemp);		
		return retptr;
	
	
	
	
	}	
		

	else
		
	{
		gas51_errno = 0 ;  // 0 -> code for file not found!!
		gas51_perror() ;
		exit(0) ;	
	
	}
		

}


char * remove_all_spaces(char *buff_to_clean)
{

	int i,j,k;
	static char cleaned_buff[80];
	for(i=0,j=0;i<strlen(buff_to_clean);i++)
	{
		if(buff_to_clean[i]!=' ' && buff_to_clean[i]!='\t' && buff_to_clean[i]!='\n' && buff_to_clean[i]!='\r' )
			{
				cleaned_buff[j] = buff_to_clean[i];
				j++;
			}
		else 
			continue;


	}


	cleaned_buff[j]= '\0' ;

	return cleaned_buff ;

}
			


void gas51_perror()
{
	printf("gas51: %s : %d : %s \n", gas51_file_being_assembled, gas51_line_no, gas51_errlist[gas51_errno]);
}



//void insert_into_define_list(char *Directive_Symbol, char *Directive_Expansion , int flag )
//{


//	gas51_define_list *tempStruct,*tempPtr;

		
	/* forming the define structure prior to insertion into the linked list...*/
	
/*	tempStruct = (gas51_define_list *)malloc(sizeof(gas51_define_list)) ;

	tempStruct->symbol = Directive_Symbol ;

	tempStruct->expansion = Directive_Expansion ; 

	tempStruct->flag = IS_DEFINED ;

	tempStruct->next = NULL ;


	tempPtr = &head ;
	while(tempPtr->next)
	{
	   tempPtr = tempPtr->next ;

	}
	
	
	tempPtr = tempStruct ;

	head.next = tempPtr ;	


	
	
}*/