Simple single function hangman.

1 files changed, 98 insertions, 0 deletions

diff --git a/hangman.c b/hangman.c
new file mode 100644
index 0000000..65d59a6
--- /dev/null
+++ b/hangman.c
@@ -0,0 +1,98 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define ALPHABET_CHARS 26
+#define MAX_GUESS 5
+
+enum state {
+	NONE,
+	WIN,
+	LOSS
+};
+
+int main(int argc, char **argv)
+{
+	bool guessed[ALPHABET_CHARS] = {0}, in_secret[ALPHABET_CHARS] = {0};
+	char *secret;
+	int bad_guesses = 0, c;
+	size_t dest, length;
+	enum state state = NONE;
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <word>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	secret = argv[1];
+	dest = 0;
+	length = strlen(secret);
+	for (size_t i = 0; i < length; i++)
+		if (isalpha(secret[i]) || isspace(secret[i]))
+			secret[dest++] = toupper(secret[i]);
+
+	length = dest;
+	for (size_t i = 0; i < length; i++)
+		if (isalpha(secret[i]))
+			in_secret[secret[i] - 'A'] = true;
+
+	printf("Hangman\n=======\n\n");
+	for (size_t i = 0; i < length; i++)
+		if (isalpha(secret[i]) && !guessed[secret[i] - 'A'])
+			putchar('_');
+		else
+			putchar(secret[i]);
+	putchar('\n');
+
+	while ((c = getchar()) != EOF) {
+		if (!isalpha(c))
+			continue;
+
+		c = toupper(c);
+
+		if (guessed[c - 'A'])
+			continue;
+
+		if (!in_secret[c - 'A']) {
+			bad_guesses++;
+			printf("Wrong!");
+			continue;
+		}
+
+		guessed[c - 'A'] = true;
+
+		for (size_t i = 0; i < length; i++)
+			if (isalpha(secret[i]) && !guessed[secret[i] - 'A'])
+				putchar('_');
+			else
+				putchar(secret[i]);
+		putchar('\n');
+
+		for (unsigned i = 0; i < ALPHABET_CHARS; i++)
+			if (in_secret[i] && !guessed[i])
+				goto cont;
+
+		state = WIN;
+
+		break;
+cont:;
+		if (bad_guesses > MAX_GUESS) {
+			state = LOSS;
+			break;
+		}
+	}
+
+	switch (state) {
+	case WIN:
+		printf("You won.\n");
+		break;
+	case LOSS:
+		printf("You lost, the secret word was: %s\n", secret);
+		break;
+	case NONE:
+		printf("Something weird happened.\n");
+		break;
+	}
+}