Question

Please, please help with C program.

This is a longer program, so take your time. But please make sure it meets all the requirements and runs.

Here is the assignment:

In this exercise you are to create a database of dogs in a file, using open, close(), read, write(), and Iseek(). Do NOT use the standard library fopen() ... calls! Be sure to follow the directions! The database file (database.dog) will be an array of records: #define SZ_NAME 32

I appreciate any help given.

Cannot use goto or system(3) function unless directed to.

Answer 1

Program Files

filename: main.c

#include <stdio.h>

#define SZ_NAME 32
#define SZ_BREED 32
#define SZ_COLOR 16

struct dog_entry
{
char name[SZ_NAME];
char breed[SZ_BREED];
char color[SZ_COLOR];
unsigned short weight;
unsigned char age;
char sex;
};

#define REC_SIZE sizeof(struct dog_entry)

void print_dog(struct dog_entry *dp)
{
printf("DOG RECORD:\n");
printf("\tNAME: %s\n", dp->name);
printf("\tBREED: %s\n", dp->breed);
printf("\tCOLOR: %s\n", dp->color);
printf("\tWEIGHT: %d\n", dp->weight);
printf("\tAGE: %d\n", dp->age);
printf("\tSEX: %c\n", dp->sex);
}

#include <stdio.h> #define SZ_NAME 32 #define SZ_BREED 32 #define SZ_COLOR 16 struct dog_entry char name[SZ_NAME]; char breed[SZ_BREED]; char color(SZ_COLOR]; unsigned short weight; unsigned char age; char sex; }; #define REC_SIZE sizeof(struct dog_entry), void print_dog(struct dog_entry *dp) printf("DOG RECORD:\n"); printf("\tNAME: %s\n", dp->name); printf("\tBREED: %s\n", dp->breed); printf("\tCOLOR: %s\n", dp->color); printf("\tWEIGHT: %d\n", dp->weight); printf("\tAGE: %d\n", dp->age); printf("\tSEX: %c\n", dp->sex);

filename: my_utilities.h

/*
my_utilities.h
*/

#include <stdio.h> // printf, perror
#include <fcntl.h> // open

#define _DBG_(fmt_str, value) printf("[%s:%d: %s = " fmt_str "]\n", __FILE__, __LINE__, #value, value)
#define DBG_STR(value) _DBG_("\"%s\"", value)
#define DBG_NUM(value) _DBG_("%d", value)
#define DBG_CHAR(value) _DBG_("'%c'", value)

int safe_open(char *, int, int, const char *);
void strip_nl(char *);
size_t read_line(int, char *, size_t);

// Permissions must be specified so that O_CREAT will not throw
// you for a loop.
int safe_open(char *fname, int flags, int permissions, const char *msg)
{
int fd = open(fname, flags, permissions);

if (fd < 0) {
perror(msg);
exit(-1);
}

return fd;
}

void strip_nl(char *str)
{
size_t len = strlen(str);
if (str[len - 1] == '\n')
str[len - 1] = '\0';
}

my_utilities.h #include <stdio.h> #include <fontl.h> // printf, perror 11 12 #define _DBG_(fmt_str, value) printf("[%s:%d: %s = " fmt_str "]\n", _FILE_, _LINE_, #value, value) #define DBG_STR(value) _DBG_("\"%s"", value) #define DBG_NUM(value) _DBG_("%d", value) #define DBG_CHAR(value) _DBG_("%c'", value), int safe_open(char *, int, int, const char *); void strip_nl(char *); size_t read_line(int, char *, size_t); 14 15 16 17 // Permissions must be specified so that O_CREAT will not throw // you for a loop. int safe_open(char *fname, int flags, int permissions, const char *msg) 19 20 int fd = open(fname, flags, permissions); if (fd < 0) { perror(msg); exit(-1); return fd; void strip_nl(char *str) size_t len = strlen(str); if (str[len - 1] == '\n') str[len - 1] = '\0'; 37

filename: dog_entry.h

#include <stdio.h>

#define SZ_NAME 32
#define SZ_BREED 32
#define SZ_COLOR 16

struct dog_entry
{
char name[SZ_NAME];
char breed[SZ_BREED];
char color[SZ_COLOR];
unsigned short weight;
unsigned char age;
char sex;
};

#define REC_SIZE sizeof(struct dog_entry)

void print_dog(struct dog_entry *dp)
{
printf("DOG RECORD:\n");
printf("\tNAME: %s\n", dp->name);
printf("\tBREED: %s\n", dp->breed);
printf("\tCOLOR: %s\n", dp->color);
printf("\tWEIGHT: %d\n", dp->weight);
printf("\tAGE: %d\n", dp->age);
printf("\tSEX: %c\n", dp->sex);
}

#include <stdio.h> m #define SZ_NAME 32 #define SZ_BREED 32 #define sz_COLOR 16 struct dog_entry char name (SZ_NAME]; char breed[SZ_BREED]; char color(SZ_COLOR]; unsigned short weight; unsigned char age; char sex; #define REC_SIZE sizeof(struct dog_entry), void print_dog(struct dog_entry *dp) printf("DOG RECORD:\n"); printf("\tNAME: %s\n", dp->name); printf("\tBREED: %s\n", dp->breed); printf("\tCOLOR: %s\n", dp->color); printf("\tWEIGHT: %d\n", dp->weight); printf("\tAGE: %d\n", dp->age); printf("\tSEX: %c\n", dp->sex);

OUTPUT

ENTER 1 to add,
2 to change,
3 to delete,
4 to view,
5 to search,
6 to exit
ENTER: 1

-ADD DOG RECORD-

-ADD DOG-

Enter the dog's NAME.
ENTER: ALpha
Enter the dog's BREED.
ENTER: Pomerion
Enter the dog's COLOR.
ENTER: Grey
Enter the dog's WEIGHT. [pounds]
ENTER: 10
Enter the dog's AGE. [years]
ENTER: 4
Enter the dog's SEX. [M/F]
ENTER: F

-RECORD TO BE ADDED-

DOG RECORD:
NAME: ALpha
BREED: Pomerion
COLOR: Grey
WEIGHT: 10
AGE: 4
SEX: F
Would you like to save this record to disk? [Y/N]
ENTER: Y

-RECORD SAVED-

ENTER 1 to add,
2 to change,
3 to delete,
4 to view,
5 to search,
6 to exit

=======================================================================

Hope this helps!

Please let me know if any changes needed.

Thank you!

I hope you're safe during the pandemic.