From: oohoseoo AT aol DOT com (OoHOSEoO)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: SIGSEGV from reading an executable...  (?)
Lines: 183
Message-ID: <1998090501523400.VAA26069@ladder01.news.aol.com>
NNTP-Posting-Host: ladder01.news.aol.com
Date: 5 Sep 1998 01:52:34 GMT
Organization: AOL http://www.aol.com
References: <1998090501154700 DOT VAA20831 AT ladder01 DOT news DOT aol DOT com>
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

ok, a little revision or two in the source; but still no difference:

(new code below)

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

long		getsize(const char*);
int		readfile(const char*, long);
void 	convert(int, char*, char*);
int 		output(long, const char*);

int main(int argc, char* argv[])
{
	long size = 0;

	if(argc == 2){
		if((size = getsize(argv[1])) == 0){
			puts("The file was zero bytes long.\n");
			return 1;
		}
		printf("at reading\nsize = %l\n", size);
		if(readfile(argv[1], size)){
			return 1;
		}
	}

	return 0;
}


int readfile(const char* argv, long size)
{
	unsigned char buf[32768];
	long amount = 32768;
	long left   = size;
	long read   = 0;
	FILE* fp;

	if((fp = fopen(argv, "rb")) == NULL){
		puts("There was an error opening the file");
		return 1;
	}

	while(left){
		if(left < amount){
			amount = left;
		}
		if((read = fread(buf, 1, amount, fp)) == 0){
			puts("There was an error reading the file");
			return 1;
		}
		output(read, buf);
		left -= amount;
	}

	fclose(fp);
	return 0;
}

int output(long size, const char* buf)
{
	char HI[5];
	char LO[5];
	long count;

	for(count = 0; count < size; count++){
		convert(buf[count], HI, LO);
		printf("%s%s ", HI, LO);	
	}	
	return 0;
}


long getsize(const char* argv)
{
	FILE* fp;
	long curpos = 0;
	long length = 0;
	
	if((fp = fopen(argv, "rb")) == NULL){
		return 0;
	}
	curpos = ftell(fp);
	printf("curpos = %l\n", curpos);

	fseek(fp, 0, SEEK_END);
	length = ftell(fp);
	printf("length = %l\n", length);

	fseek(fp, curpos, SEEK_SET);
	fclose(fp);

	return length;
}


void convert(int Byte, char* HI, char* LO)
{
	char chr[3];
	int status = 0;
	
	if(Byte == 0){
		strcpy(chr, "00");
	}else{
		sprintf(chr, "%02X", Byte);
	}
	while(status < 2){
		switch(chr[status]){
			case '0':
				if(!status) strcpy(HI, "0000");
				if(status) strcpy(LO, "0000");
			case '1':
				if(!status) strcpy(HI, "0001");
				if(status) strcpy(LO, "0001");
				break;
			case '2':
				if(!status) strcpy(HI, "0010");
				if(status) strcpy(LO, "0010");
				break;
			case '3':
				if(!status) strcpy(HI, "0011");
				if(status) strcpy(LO, "0011");
				break;
			case '4':
				if(!status) strcpy(HI, "0100");
				if(status) strcpy(LO, "0100");
				break;
			case '5':
				if(!status) strcpy(HI, "0101");
				if(status) strcpy(LO, "0101");
				break;
			case '6':
				if(!status) strcpy(HI, "0110");
				if(status) strcpy(LO, "0110");
				break;
			case '7':
				if(!status) strcpy(HI, "0111");
				if(status) strcpy(LO, "0111");
				break;
			case '8':
				if(!status) strcpy(HI, "1000");
				if(status) strcpy(LO, "1000");
				break;
			case '9':
				if(!status) strcpy(HI, "1001");
				if(status) strcpy(LO, "1001");
				break;
			case 'A':
				if(!status) strcpy(HI, "1010");
				if(status) strcpy(LO, "1010");
				break;
			case 'B':
				if(!status) strcpy(HI, "1011");
				if(status) strcpy(LO, "1011");
				break;
			case 'C':
				if(!status) strcpy(HI, "1100");
				if(status) strcpy(LO, "1100");
				break;
			case 'D':
				if(!status) strcpy(HI, "1101");
				if(status) strcpy(LO, "1101");
				break;
			case 'E':
				if(!status) strcpy(HI, "1110");
				if(status) strcpy(LO, "1110");
				break;
			case 'F':
				if(!status) strcpy(HI, "1111");
				if(status) strcpy(LO, "1111");
				break;
		}
		status++;
	}
	return;
}


James B.  (OoHOSEoO AT aol DOT com)

*please enable "Email author" or "CC Author" before you post, thank you :)