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2-StudentDB/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