sdbsc.h

#ifndef __SDB_H__

#include "db.h" //get student record type

//prototypes for functions go below for this assignment
int  open_db(char *dbFile, bool should_truncate);
int  add_student(int fd, int id, char *fname, char *lname, int gpa);
int  get_student(int fd, int id, student_t *s);
int  del_student(int fd, int id);
int  compress_db(int fd);
void print_student(student_t *s);
int  validate_range(int id, int gpa);
int  count_db_records(int fd);
int  print_db(int fd);
void usage(char *);

//error codes to be returned from individual functions
// NO_ERROR is returned if there are no errors
// ERR_DB_FILE is returned if there is are any issues with the database file itself
// ERR_DB_OP is returned if an operation did not work aka add or delete a student
// SRCH_NOT_FOUND is returned if the student is not found (get_student, and del_student)
#define NO_ERROR        0
#define ERR_DB_FILE     -1
#define ERR_DB_OP       -2
#define SRCH_NOT_FOUND  -3
#define NOT_IMPLEMENTED_YET 0


//error codes to be returned to the shell
// EXIT_OK          program executed without error
// EXIT_FAIL_DB     a database operation failed
// EXIT_FAIL_ARGS   one or more arguments to program were not valid
// EXIT_NOT_IMPL    the operation has not been implemented yet
#define EXIT_OK         0
#define EXIT_FAIL_DB    1
#define EXIT_FAIL_ARGS  2
#define EXIT_NOT_IMPL   3

//Output messages
#define M_ERR_STD_RNG      "Cant add student, either ID or GPA out of allowable range!\n"
#define M_ERR_DB_CREATE    "Error creating DB file, exiting!\n"
#define M_ERR_DB_OPEN      "Error opening DB file, exiting!\n"
#define M_ERR_DB_READ      "Error reading DB file, exiting!\n"
#define M_ERR_DB_WRITE     "Error writing DB file, exiting!\n"
#define M_ERR_DB_ADD_DUP   "Cant add student with ID=%d, already exists in db.\n"
#define M_ERR_STD_PRINT    "Cant print student. Student is NULL or ID is zero\n"

#define M_STD_ADDED        "Student %d added to database.\n"
#define M_STD_DEL_MSG      "Student %d was deleted from database.\n"
#define M_STD_NOT_FND_MSG  "Student %d was not found in database.\n"
#define M_DB_COMPRESSED_OK "Database successfully compressed!\n"
#define M_DB_ZERO_OK       "All database records removed!\n"
#define M_DB_EMPTY         "Database contains no student records.\n"
#define M_DB_RECORD_CNT    "Database contains %d student record(s).\n"
#define M_NOT_IMPL         "The requested operation is not implemented yet!\n"

//useful format strings for print students
//For example to print the header in the required output:
//  printf(STUDENT_PRINT_HDR_STRING, "ID","FIRST NAME", 
//                                   "LAST_NAME", "GPA");
#define  STUDENT_PRINT_HDR_STRING   "%-6s %-24s %-32s %-3s\n"
#define  STUDENT_PRINT_FMT_STRING   "%-6d %-24.24s %-32.32s %-3.2f\n"

#endif