1: /*
2: * MDBUTIL.C
3: *
4: * Program: Mini-Database
5: * Written by: Leor Zolman
6: * Module: Utility functions
7: */
8:
9: #include <stdio.h>
10: #include <stdlib.h>
11: #include "mdb.h"
12:
13:
14: /*
15: * Function: do_menu
16: * Purpose: Simple line-oriented menu handler
17: * Parameters: None
18: * Return Value: None
19: */
20:
21: int do_menu(struct menu_item *mnu, char *title)
22: {
23: int i, j;
24: char buf[150];
25:
26: printf("\n%s -- Options:\n", title);
27: for (i = 0; mnu[i].action_code != NULL; i++)
28: printf("%2d) %s\n", i+1, mnu[i].descrip);
29:
30: while (1)
31: {
32: printf("\nYour choice? "};
33: j = atoi(gets(buf));
34: if (j >= 1 && j <= i)
35: break;
36: printf("Please select from options 1-%d: ", i+1);
37: }
38:
39: return mnu[j - 1].action_code;
40: }
41:
42:
43: /*
44: * Function: error
45: * Purpose: Report error end terminate program
46: * Parameters: Message to display
47: * Return Value: None
48: */
49:
50: void error(char *msg)
51: {
52: printf ("Fatal Condition: %s\n", msg);
53: exit(-1);
54: }
55:
56:
57: /*
58: * Function: alloc_rec
59: * Purpose: Allocate memory for a Database record,
60: * checking for an allocation error
61: * Parameters: None
62: * Return Value: Pointer to memory, or NULL on error
63: */
64:
65: struct record *alloc_rec(void)
66: {
67: struct record *temp;
68:
69: if ((temp = malloc(sizeof(struct record))) == NULL)
70: return NULL;
71: else
72: return temp;
73: }
74:
75:
76: /*
77: * Function: free_up
78: * Purpose: De_allocate all records in current Database
79: * Parameters: None
80: * Return Value: None
81: */
82:
83: void free_up()
84: {
85: int i;
86:
87: for (i = 0; i < n_recs; i++)
88: free(RECS[i]);
89: }
90:
91: