minix/commands/advent/database.c

142 lines
2.4 KiB
C
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2005-04-21 16:53:53 +02:00
/* 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;
}