Just in time processing on a character stream: Difference between revisions

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(→‎{{header|Perl 6}}: Made a bit more robust)
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This task was inspired by the movie "[[wp:National_Treasure_%28film%29|National Treasure]]" with refers to a "[[wp:Book cipher|book cipher]]".
This task was inspired by the movie "[[wp:National_Treasure_%28film%29|National Treasure]]" with refers to a "[[wp:Book cipher|book cipher]]".

=={{header|C}}==
{{trans|C++}}
<lang c>#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

struct UserInput {
char formFeed;
char lineFeed;
char tab;
char space;
};

struct UserInputNode {
struct UserInput ui;
struct UserInputNode *next;
};

bool decode(FILE *fp, const struct UserInput ui) {
char f = 0, l = 0, t = 0, s = 0;
char buffer[1];

while (fread(buffer, 1, 1, fp)) {
char c = buffer[0];

if (f == ui.formFeed && l == ui.lineFeed && t == ui.tab && s == ui.space) {
if (c == '!')
return false;
putchar(c);
return true;
} else if (c == '\f') {
f++;
l = t = s = 0;
} else if (c == '\n') {
l++;
t = s = 0;
} else if (c == '\t') {
t++;
s = 0;
} else {
s++;
}
}

return false;
}

void decodeFile(char *fileName, struct UserInputNode *uin) {
FILE *fp;

fp = fopen(fileName, "r");
if (NULL == fp) {
fprintf(stderr, "Could not find %s\n", fileName);
return;
}

if (NULL == uin) {
fprintf(stderr, "No user input detected!\n");
return;
}

while (NULL != uin) {
if (!decode(fp, uin->ui)) {
break;
}
fseek(fp, 0, SEEK_SET);
uin = uin->next;
}
printf("\n\n");
}

struct UserInputNode *getUserInput() {
struct UserInputNode *uip, *temp;

// 0 18 0 0
temp = malloc(sizeof(struct UserInputNode));
temp->ui.formFeed = 0;
temp->ui.lineFeed = 18;
temp->ui.tab = 0;
temp->ui.space = 0;
uip = temp;

// 0 68 0 1
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 68;
temp->ui.tab = 0;
temp->ui.space = 1;

// 0 100 0 32
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 100;
temp->ui.tab = 0;
temp->ui.space = 32;

// 0 114 0 45
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 114;
temp->ui.tab = 0;
temp->ui.space = 45;

// 0 38 0 26
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 38;
temp->ui.tab = 0;
temp->ui.space = 26;

// 0 16 0 21
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 16;
temp->ui.tab = 0;
temp->ui.space = 21;

// 0 17 0 59
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 17;
temp->ui.tab = 0;
temp->ui.space = 59;

// 0 11 0 29
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 11;
temp->ui.tab = 0;
temp->ui.space = 29;

// 0 102 0 0
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 102;
temp->ui.tab = 0;
temp->ui.space = 0;

// 0 10 0 50
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 10;
temp->ui.tab = 0;
temp->ui.space = 50;

// 0 39 0 42
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 39;
temp->ui.tab = 0;
temp->ui.space = 42;

// 0 33 0 50
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 33;
temp->ui.tab = 0;
temp->ui.space = 50;

// 0 46 0 54
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 46;
temp->ui.tab = 0;
temp->ui.space = 54;

// 0 76 0 47
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 76;
temp->ui.tab = 0;
temp->ui.space = 47;

// 0 84 2 28
temp->next = malloc(sizeof(struct UserInputNode));
temp = temp->next;
temp->ui.formFeed = 0;
temp->ui.lineFeed = 84;
temp->ui.tab = 2;
temp->ui.space = 28;

temp->next = NULL;
return uip;
}

void freeUserInput(struct UserInputNode *uip) {
if (NULL == uip) {
return;
}

freeUserInput(uip->next);
uip->next = NULL;

free(uip);
}

int main() {
struct UserInputNode *uip;

uip = getUserInput();
decodeFile("theRaven.txt", uip);
freeUserInput(uip);

return 0;
}</lang>
{{out}}
<pre>Silence-Dogood.</pre>


=={{header|C++}}==
=={{header|C++}}==
Retrieved from "https://rosettacode.org/wiki/Just_in_time_processing_on_a_character_stream"