From d60566c7e31293273b417679782f0614dd00d01a Mon Sep 17 00:00:00 2001
From: Paweł Redman <pawel.redman@gmail.com>
Date: Wed, 16 May 2018 19:17:02 +0200
Subject: Better option parsing.

---
 turbowc.c | 50 +++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 39 insertions(+), 11 deletions(-)

diff --git a/turbowc.c b/turbowc.c
index 36bd6d4..c556ed5 100644
--- a/turbowc.c
+++ b/turbowc.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <string.h>
+#include <getopt.h>
 #include <emmintrin.h>
 #include <pthread.h>
 #include <unistd.h>
@@ -102,24 +103,19 @@ static void *thread_f(void *arg)
 	return NULL;
 }
 
-int main(int argc, char **argv)
+static int turbowc(const char *path, size_t num_threads)
 {
-	int ret = 1, fd;
+	int ret = 1, opt, fd;
 	struct stat stat;
 	void *map;
-	size_t i, num_threads = 4;
+	size_t i;
 	pthread_t *threads;
 	struct timespec t0, t1;
 	double delta;
 
-	if (argc < 2) {
-		fprintf(stderr, "%s [file]\n", argv[0]);
-		return 1;
-	}
-
-	fd = open(argv[1], O_RDONLY);
+	fd = open(path, O_RDONLY);
 	if (fd == -1) {
-		perror("open");
+		perror(path);
 		goto error_open;
 	}
 
@@ -170,7 +166,7 @@ int main(int argc, char **argv)
 	data_pool.total += count_newlines(data_pool.cursor, data_pool.left);
 	clock_gettime(CLOCK_MONOTONIC, &t1);
 
-	printf("%zu %s\n", data_pool.total, argv[1]);
+	printf("%zu %s\n", data_pool.total, path);
 
 	delta = (t1.tv_sec - t0.tv_sec) +
 		((double)t1.tv_nsec - t0.tv_nsec) * 1.0e-9;
@@ -196,3 +192,35 @@ error_fstat:
 error_open:
 	return ret;
 }
+
+int main(int argc, char **argv)
+{
+	int opt;
+	size_t num_threads = 1;
+
+	while ((opt = getopt(argc, argv, "vt:")) != -1) {
+		switch (opt) {
+		case 'v':
+			printf("turbowc, with mmap, SSE2 and multithreading\n");
+			break;
+
+		case 't':
+			num_threads = strtoull(optarg, NULL, 10);
+			break;
+
+		default:
+		print_usage:
+			fprintf(stderr, "usage: turbowc [-v] [-t THREADS] [FILE]\n");
+			return 1;
+		}
+	}
+
+	if (optind >= argc)
+		goto print_usage;
+
+	for (; optind < argc; optind++ )
+		if (turbowc(argv[optind], num_threads))
+			return 1;
+
+	return 0;
+}
-- 
cgit