Hangman

src/dynarray.c

@@ -0,0 +1,40 @@
+#include "dynarray.h"
+
+struct dynarray create_dynarray() {
+  struct dynarray d;
+  d.index = 0;
+  d.capacity = 128;
+  d.buffer = malloc(d.capacity);
+  memset(d.buffer, 0, d.capacity);
+  return d;
+}
+
+void append(struct dynarray* d, char c) {
+  d->buffer[d->index++] = c;
+  if (d->index == d->capacity) {
+    d->buffer = realloc(d->buffer, d->capacity *= 2);
+    // Clear the rest of the buffer
+    memset(&d->buffer[d->index], 0, d->capacity - d->index);
+  }
+}
+
+void pop(struct dynarray* d) {
+  if (!d->index)
+    return;
+  
+  d->buffer[--d->index] = 0;
+}
+
+void read_line(struct dynarray* d) {
+  char c;
+  while (1) {
+    read(0, &c, 1);
+    if (c == '\n')
+      break;
+    else if (c == '\b') {
+      pop(d);
+      write(1, &c, 1);
+    } else 
+      append(d, c);
+  }
+}

src/dynarray.h

@@ -0,0 +1,21 @@
+#ifndef DYNARRAY_H
+#define DYNARRAY_H
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct dynarray {
+  char* buffer;
+  int index;
+  int capacity;
+};
+
+struct dynarray create_dynarray();
+void append(struct dynarray* d, char c);
+void pop(struct dynarray* d);
+
+void read_line(struct dynarray* d);
+
+#endif

src/main.c

@@ -1,5 +1,118 @@
 #include <stdio.h>
+#include <unistd.h>
+
+#include "dynarray.h"
+
+char* hangman_stages[6] = {
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "        |   \n"
+  "        |   \n"
+  "        |   \n"
+  "        |   \n"
+  "============\n",
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "  O     |   \n"
+  "        |   \n"
+  "        |   \n"
+  "        |   \n"
+  "============\n",
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "  O     |   \n"
+  "  +     |   \n"
+  "        |   \n"
+  "        |   \n"
+  "============\n",
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "  O     |   \n"
+  " /+     |   \n"
+  "        |   \n"
+  "        |   \n"
+  "============\n",
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "  O     |   \n"
+  " /+\\    |   \n"
+  "        |   \n"
+  "        |   \n"
+  "============\n",
+  "  /-----\\  \n"
+  "  |     |   \n"
+  "  O     |   \n"
+  " /+\\    |   \n"
+  "  ^     |   \n"
+  "        |   \n"
+  "============\n",
+};
 
 int main(int argc, char** argv) {
-  printf("Hello, World!\n");
+  int letters_guessed[26] = {0};
+  struct dynarray correct_word = create_dynarray();
+
+  printf("Please enter the word(s) that should be guessed: ");
+  fflush(stdout);
+  read_line(&correct_word);
+
+  for (int i=0; i<correct_word.index; i++) {
+    if (correct_word.buffer[i] != 32) {
+      char cn = correct_word.buffer[i] & ~32;
+      if (cn < 0x41 || cn > 0x5a) {
+        printf("Invalid character `%c` in input!\n", correct_word.buffer[i]);
+        return -1;
+      }
+    }
+  }
+
+  int stage = 0;
+  while (stage != 5) {
+    printf("Guesses: ");
+    for (int i=0; i<26; i++)
+      printf(letters_guessed[i]?" %c ":"", 0x41+i);
+    printf("\n");
+    int correct = 0;
+    for (int i=0; i<correct_word.index; i++)
+      printf(correct_word.buffer[i]==32?(correct++, " / "):(letters_guessed[correct_word.buffer[i]-0x41]?(correct++, " %c "):" _ "), correct_word.buffer[i]);
+    if (correct == correct_word.index)
+      break;
+    printf("\n");
+    printf(hangman_stages[stage]);
+
+    char c;
+    int cn;
+    while (1) {
+      printf("Guess a letter: ");
+      do c = getchar(); while (c == '\n');
+      c &= ~32;
+      if (c < 0x41 || c > 0x5a) {
+        printf("\nPlease enter a valid letter!\n");
+        continue;
+      }
+      cn = c - 0x41;
+      if (!letters_guessed[cn]) {
+        letters_guessed[cn] = 1;
+        break;
+      }
+      printf("\nLetter already guessed!\n");
+    }
+
+    // Determine if the letter is in the string
+
+    int found = 0;
+    for (int i=0; i<correct_word.index; i++)
+      if (correct_word.buffer[i] == c)
+        found = 1;
+    
+    if (!found) {
+      stage++;
+    }
+  }
+
+  if (stage == 5) {
+    printf(hangman_stages[stage]);
+    printf("You lost!\nThe correct word was: %s\n", correct_word.buffer);
+  } else
+    printf("You win!\n");
 }