142 lines
2.4 KiB
C
142 lines
2.4 KiB
C
/* program DATABASE.C */
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include "advent.h"
|
|
#include "advdec.h"
|
|
#include "advtext.h"
|
|
|
|
static char oline[256];
|
|
|
|
_PROTOTYPE(void rdupto, (FILE *, int, int, char *));
|
|
_PROTOTYPE(void rdskip, (FILE *, int, int));
|
|
|
|
/*
|
|
Function to scan a file up to a specified
|
|
point and either print or return a string.
|
|
*/
|
|
void rdupto(fdi, uptoc, print, string)
|
|
FILE *fdi;
|
|
int uptoc, print;
|
|
char *string;
|
|
{
|
|
int c, i;
|
|
static _CONST unsigned char key[4] = {'c' | 0x80, 'L' | 0x80,
|
|
'y' | 0x80, 'D' | 0x80};
|
|
|
|
i = 1;
|
|
while ((c = getc(fdi)) != uptoc && c != EOF) {
|
|
if (c == '\n')
|
|
i = 1;
|
|
if (c >= 0x80)
|
|
c ^= key[i++ & 3];
|
|
if (c == '\r')
|
|
continue;
|
|
if (print)
|
|
putchar(c);
|
|
else
|
|
*string++ = (char) c;
|
|
}
|
|
if (!print)
|
|
*string = '\0';
|
|
return;
|
|
}
|
|
|
|
/*
|
|
Function to read a file skipping
|
|
a given character a specified number
|
|
of times, with or without repositioning
|
|
the file.
|
|
*/
|
|
void rdskip(fdi, skipc, n)
|
|
FILE *fdi;
|
|
int skipc, n;
|
|
{
|
|
int c;
|
|
|
|
while (n--)
|
|
while ((c = getc(fdi)) != skipc)
|
|
if (c == EOF)
|
|
bug(32);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
Routine to request a yes or no answer to a question.
|
|
*/
|
|
boolean yes(msg1, msg2, msg3)
|
|
int msg1, msg2, msg3;
|
|
{
|
|
char answer[INPUTBUFLEN];
|
|
|
|
if (msg1)
|
|
rspeak(msg1);
|
|
do {
|
|
switch (*ask("\n> ", answer, sizeof(answer))) {
|
|
case 'n':
|
|
case 'N':
|
|
if (msg3)
|
|
rspeak(msg3);
|
|
return (FALSE);
|
|
case 'y':
|
|
case 'Y':
|
|
if (msg2)
|
|
rspeak(msg2);
|
|
return (TRUE);
|
|
default:
|
|
fputs("Please answer Y (yes) or N (no).", stdout);
|
|
}
|
|
} while (TRUE);
|
|
}
|
|
|
|
/*
|
|
Print a location description from "advent4.txt"
|
|
*/
|
|
void rspeak(msg)
|
|
int msg;
|
|
{
|
|
if (msg == 54)
|
|
printf("ok.\n");
|
|
else {
|
|
fseek(fd4, idx4[msg - 1], 0);
|
|
rdupto(fd4, '#', 1, 0);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
Print an item message for a given state from "advent3.txt"
|
|
*/
|
|
void pspeak(item, state)
|
|
int item, state;
|
|
{
|
|
fseek(fd3, idx3[item - 1], 0);
|
|
rdskip(fd3, '/', state + 2);
|
|
rdupto(fd3, '/', FALSE, oline);
|
|
if (strncmp(oline, "<$$<", 4) != 0)
|
|
printf("%s", oline);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
Print a long location description from "advent1.txt"
|
|
*/
|
|
void desclg(loc)
|
|
int loc;
|
|
{
|
|
fseek(fd1, idx1[loc - 1], 0);
|
|
rdupto(fd1, '#', 1, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
Print a short location description from "advent2.txt"
|
|
*/
|
|
void descsh(loc)
|
|
int loc;
|
|
{
|
|
fseek(fd2, idx2[loc - 1], 0);
|
|
rdupto(fd2, '#', 1, 0);
|
|
return;
|
|
}
|