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From: thurmag@jacobs.cs.orst.edu (Gary Thurman)
Newsgroups: comp.lang.c
Subject: Trouble spot!
Message-ID: <1991Apr11.201116.28143@lynx.CS.ORST.EDU>
Date: 11 Apr 91 20:11:16 GMT
Sender: @lynx.CS.ORST.EDU
Distribution: usa
Organization: Oregon State University, CS Dept.
Lines: 198
Nntp-Posting-Host: jacobs.cs.orst.edu

I am in the process of learning Turbo-C, and have learned most of what I know
through reading books.  I have finally reached a point for which I need help
from people that know what their doing! :-)  I am trying to re-call data from
a simple mailing list database, just by giving a persons name.  I have a 
feeling that I'm not setting up the function "Find()" the right way.  Any
help would sure be appreciated.  Thanks.

			Here is the program:
			

/* A simple mailing list  */

#include <stdio.h>
#include <ctype.h>

#define SIZE 100

struct addr {
	char name[40];
	char street[40];
	char city[30];
	char state[3];
	char zip[10];
} addr_info[SIZE];

void enter(), init_list(), display(), save(), load(), find();

main()
{
	char choice;

	init_list();

	for(;;) {
		choice = menu();
		switch(choice) {
			case 'e': enter();
				break;
			case 'd': display();
				break;
			case 'f': find();
				break;
			case 's': save();
				break;
			case 'l': load();
				break;
			case 'q': exit(1);
		}
	}
}

/* initialize the addr_info array */
void init_list()
{
	register int t;

	for(t=0; t<SIZE; t++) *addr_info[t].name='\0';
	/* a zero length name signifies empty */
}

/* get a menu selection */
menu()
{
	char s[80];

	do {
		printf("\t\t\t(E)nter\n");
		printf("\t\t\t(D)isplay\n");
      printf("\t\t\t(F)ind\n");
		printf("\t\t\t(L)oad\n");
		printf("\t\t\t(S)ave\n");
		printf("\t\t\t(Q)uit\n");
		printf("\t\t\tchoose one: ");
		gets(s);
	}  while(!strrchr("edflsq", tolower(*s)));
	return tolower(*s);
}

/* put names into addr_info */
void enter()
{
	register int i;

	for(i=0; i<SIZE; i++)
		if(!*addr_info[i].name) break;

	if(i==SIZE) {
		printf("addr_info full\n");
		return;
	}
	printf("Name: ");
	gets(addr_info[i].name);

	printf("Street: ");
	gets(addr_info[i].street);

	printf("City: ");
	gets(addr_info[i].city);

	printf("State: ");
	gets(addr_info[i].state);

	printf("Zip: ");
	gets(addr_info[i].zip);
}

/* display the addr_info */
void display()
{
	register int t;

	for(t=0; t<SIZE; t++) {
		if(*addr_info[t].name) {
			printf("%s\n", addr_info[t].name);
			printf("%s\n", addr_info[t].street);
			printf("%s\n", addr_info[t].city);
			printf("%s\n", addr_info[t].state);
			printf("%s\n", addr_info[t].zip);
		}
	}
}

/* ************************* Trouble Area ************************ */
/* reads formated data from database */
void find()
{
   FILE *fptr;                     /* declare ptr to FILE */
   char name[40];                  /* maillist name */
   int *addr_info

   /* open it to read */

   if((fptr=fopen("maillist.txt","r"))==NULL) {
		printf("cannot open file\n");
		return;
	}

	printf("Name? ");
   gets(name);

	/* look for info */
   while(!feof(fptr)) {
   	fscanf(fptr,"%s %s %s %s %d", addr_info[t].name, addr_info[t].street, addr_info[t].city, addr_info[t].state, addr_info[t].zip);
      if(!strcmp(addr_info[t].name)) {
      	printf("%s %s %s %s %d\n", addr_info[t].name, addr_info[t].street, addr_info[t].city, addr_info[t].state, addr_info[t].zip);
			break;
		}
	}
   fclose(*fptr);
}
/* ***********This is the end of the find() function**********  */


/* save the list */
void save()
{
	FILE  *fp;
	register int i;

	if((fp=fopen("maillist.txt","wb"))==NULL) {
		printf("cannot open file\n");
		return;
	}

	for(i=0; i<SIZE; i++)
		if(*addr_info[i].name)
			if(fwrite(&addr_info[i],sizeof(struct addr),1,fp)!=1)
				printf("file write error\n");
	fclose(fp);
}

/* load the file */
void load()
{
	FILE  *fp;
	register int i;

	if((fp=fopen("maillist.txt","rb"))==NULL) {
		printf("cannot open file\n");
		return;
	}

	init_list();
	for(i=0; i<SIZE; i++)
		if(fread(&addr_info[i],sizeof(struct addr),1,fp)!=1) {
			if(feof (fp)) {
				fclose(fp);
				return;
			}
			printf("file read error\n");
		}
}

--
        _**_                   "We came...We saw...We kicked some ASH!"
       /____|-IIIIIIIIIIII      Gary Thurman ------ FIREFIGHTER/EMT 2
     >| 132 |-----------\       Email:  thurmag@jacobs.cs.orst.edu
      +-(O)--------(O)--+       Corvallis, Oregon