From: Eab AT salnet DOT org
Message-Id: <199811052339.SAA21629@delorie.com>
To: djgpp AT delorie DOT com
Date: 5 Nov 1998 17:35:00 CST
Subject: Why won't this program run?
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="zzzz726d825658c60salnet.orgzzzz"
Reply-To: djgpp AT delorie DOT com

> If you are reading this text, then your mail reader does not support
> the MIME (Multipurpose Internet Mail Extensions) standard.  To take
> full advantage of the features of this message, you need to upgrade
> your mailer to a MIME V1.0 compliant package.  Some parts of this
> message may be in human readable form.

--zzzz726d825658c60salnet.orgzzzz
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

I've been having some trouble.  The attached C source file compiled, but
the instant I attempt to run it, it quits.  Does anybody have any ideas
as to why I'm having trouble?

Ethan Bowker
eab AT salnet DOT org

--zzzz726d825658c60salnet.orgzzzz
Content-Type: text/plain; name="call.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="call.c"

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

#define LAST -1

struct person {
	char *name;
	int call1, call2;
} *people;

int calc(int index, int num) {
	if(people[index].call1!=LAST)
		num=calc(people[index].call1,num+1);
	else num++;
	if(people[index].call2!=LAST)
		num=calc(people[index].call2,num+1);
	else num++;
	return num;
}

int main() {
	char **input;
	char name[20];
	char *tok;
	int i, j, done=0, numlines=10;

	input=(char **)malloc(10);
	puts("Enter data:\n");
	for(i=0,done=0;!done;i++) {
		if(i==numlines)
		if(realloc(&input,numlines+=10)==NULL) {
			puts("Not enough memory!\n");
			return 1;
		}
		if((input[i]=(char *)malloc(20))==NULL) {
			puts("Not enough memory!\n");
			return 1;
		}
		gets(input[i]);
		if(input[i][0]=='.') done=-1;
	}
	free(input[i]);
	realloc(&input,i-1);
	numlines=i-1;

	printf("Enter person: "); gets(name);

	if((people=malloc(sizeof(struct person)*numlines))==NULL) {
		printf("Not enough memory!\n");
		return 1;
	}
	for(i=0;i<numlines;i++) {
		people[i].name=strtok(input[i]," :");
		people[i].call1=people[i].call2=LAST;
	}
	for(i=0;i<numlines;i++) {
		tok=strtok(input[i]," :");
		while(tok[0]==0) tok=strtok(NULL," :");
		tok=strtok(NULL," :");
		while(tok[0]==0) tok=strtok(NULL," :");
		for(j=0;j<numlines;j++) 
			if(stricmp(people[j].name,tok)==0) {people[i].call1=j; break;}
		tok=strtok(NULL," :");
		while(tok[0]==0) tok=strtok(NULL," :");
		for(j=0;j<numlines;j++)
			if(stricmp(people[j].name,tok)==0) {people[i].call2=j; break;}
	}
	for(i=0,j=0;i<numlines;i++)
		if(stricmp(people[i].name,name)==0) {j=calc(i,0);break;}
	printf("%s calls %i people.", name, j);
	return 0;
}
	

--zzzz726d825658c60salnet.orgzzzz--