Save results to file instead of checking puzzles while solving

main.c

@@ -26,41 +26,47 @@
 #include <sys/mman.h>
 #include <unistd.h>
 
-#define FNAME "puzzles"
-#define FSIZE 729000000U
-#define NSUD (FSIZE / NCELLS)
+#define IFNAME "puzzles"
+#define OFNAME "results"
+#define NSUD 9000000U
+#define FSIZE (NSUD * NCELLS)
 
 int main(void)
 {
-	int fd = open(FNAME, O_RDONLY);
+	int fd;
+
+	fd = open(IFNAME, O_RDONLY);
 	if (fd == -1) {
 		fputs("Failed to open puzzles file\n", stderr);
 		return EXIT_FAILURE;
 	}
+	char *ibuf = mmap(NULL, FSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (ibuf == MAP_FAILED) {
+		fputs("Failed to mmap() puzzles file\n", stderr);
+		return EXIT_FAILURE;
+	}
+	close(fd);
 
-	char *buf = mmap(NULL, FSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
-	if (buf == MAP_FAILED)
-		fputs("Failed to mmap() puzzle file\n", stderr);
-
+	fd = open(OFNAME, O_RDWR);
+	if (fd == -1) {
+		fputs("Failed to open results file\n", stderr);
+		return EXIT_FAILURE;
+	}
+	char *obuf = mmap(NULL, FSIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (obuf == MAP_FAILED) {
+		fputs("Failed to mmap() results file\n", stderr);
+		return EXIT_FAILURE;
+	}
 	close(fd);
 
 	struct sudoku sud;
-	unsigned solved = 0;
-	for (unsigned i = 0; i < NSUD; ++i) {
-		if (!load(&sud, buf + (NCELLS * i))) {
-			fputs("Failed to load sudoku\n", stderr);
-			return EXIT_FAILURE;
-		}
-		if (solve(&sud) == -1) {
-			fprintf(stderr, "Solver error on sudoku #%u\n", i);
-			return EXIT_FAILURE;
-		}
-		if (filled(&sud))
-			++solved;
+	for (unsigned o = 0; o < FSIZE; o += NCELLS) {
+		load(&sud, ibuf + o);
+		solve(&sud);
+		save(&sud, obuf + o);
 	}
 
-	double solved_pc = 1e2 * (double)solved / (double)NSUD;
-	printf("Solved %u/%u (%.3lf%%)\n", solved, NSUD, solved_pc);
-
+	munmap(ibuf, FSIZE);
+	munmap(obuf, FSIZE);
 	return EXIT_SUCCESS;
 }