structure

src/wordle.c

@@ -0,0 +1,115 @@
+#include <ctype.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+/* TODO: sysexits.h */
+
+#define PROGRAM_NAME "wordle"
+#define DEFAULT_DICTIONARY_FILENAME "/usr/share/" PROGRAM_NAME "/dictionary.txt"
+#define DEFAULT_SOLUTIONS_FILENAME "/usr/share/" PROGRAM_NAME "/solutions.txt"
+#define WORD_LENGTH 5
+#define GUESSES 6
+
+int
+dictionary_has(char *s, int fd){
+	char buf[WORD_LENGTH + 2];
+	if(lseek(fd, 0, SEEK_SET) != 0){
+		fprintf(stderr, "%s: Could not seek to the start of the"
+			" dictionary (errno %d).\n", PROGRAM_NAME, errno
+		);
+		close(fd);
+		exit(1);
+	}
+	/* unused, but just in case */
+	buf[WORD_LENGTH + 1] = '\0';
+
+	if(read(fd, buf, WORD_LENGTH + 1) < WORD_LENGTH)
+		return 1;
+}
+
+int
+strisuint(char *s){
+	while(*s != '\0')
+		if(!isdigit(*(s++)))
+			return 0;
+	return 1;
+}
+
+void
+usage(char *name){
+	fprintf(stderr, "Usage: %s [index] (-d [dictionary file])"
+		" (-s [solutions file])\n", name
+	);
+	exit(1);
+}
+
+int main(int argc, char *argv[]){
+	int c;
+	int dictionary_fd;
+	size_t i;
+	size_t index;
+	size_t j;
+	FILE *solutions_file;
+	char word[WORD_LENGTH + 1];
+
+	/* arg parse */
+	if(argc < 2)
+		usage(argv[0] != NULL ? argv[0] : PROGRAM_NAME);
+	while((c = getopt(argc, argv, "d:hs:")) != -1)
+		switch(c){
+		case 'd':
+			dictionary_filename = optarg;
+			break;
+		case 's':
+			solutions_filename = optarg;
+			break;
+		case 'h':
+			usage(argv[0] != NULL ? argv[0] : PROGRAM_NAME);
+		}
+	if(!strisuint(argv[optind])){
+		fprintf(stderr, "%s: index must be a number.\n",
+			argv[0] != NULL ? argv[0] : PROGRAM_NAME
+		);
+		exit(1);
+	}
+	index = (size_t)atoi(argv[optind]);
+
+	/* get word */
+	if((solutions_file = fopen(solutions_filename, "rb")) == NULL){
+		fprintf(stderr, "%s: %s: Error opening solutions file.\n",
+			argv[0] != NULL ? argv[0] : PROGRAM_NAME, solutions_filename
+		);
+		exit(1);
+	}
+	i = j = 0;
+	while((c = getc(solutions_file)) != EOF)
+		if(i == index){
+			if(j == WORD_LENGTH){
+				word[WORD_LENGTH] = '\0';
+				j = 0;
+				break;
+			}else
+				word[j++] = c;
+		}else
+			i += c == '\n';
+	if(j != '\0'){
+		word[j] = '\0';
+		fprintf(stderr, "%s: %s: Word is too few characters.\n",
+			argv[0] != NULL ? argv[0] : PROGRAM_NAME, word
+		);
+		exit(1);
+	}
+	fclose(solutions_file);
+
+	if(dictionary_fd = open(dictionary_filename, O_RDONLY) == NULL){
+		fprintf(stderr, "%s: %s: Error opening dictionary file.\n",
+			argv[0] != NULL ? argv[0] : PROGRAM_NAME, dictionary_filename
+		);
+		exit(1);
+	}
+
+	close(dictionary_fd);
+	exit(0);
+}