[hackers] [ubase] Use eprintf() wherever possible, add -h to options || sin

[git]

commit 7fa098ace67f2089710608f788259931a118acc6
Author: sin <s...@2f30.org>
Date:   Wed Jun 4 12:59:45 2014 +0100

    Use eprintf() wherever possible, add -h to options

diff --git a/dd.c b/dd.c
index f472c88..c4db974 100644
--- a/dd.c
+++ b/dd.c
@@ -20,6 +20,7 @@
 #include <sys/vfs.h>
 #include <time.h>
 #include <unistd.h>
+#include "util.h"
 
 struct dd_config {
        const char *in, *out;
@@ -191,8 +192,7 @@ copy(struct dd_config *ddc)
 static void
 usage(void)
 {
-       fprintf(stderr, "Usage: odd [if=F1] [of=F2] [bsize] [skip=N] [count=N] 
[quiet] [nosync]
");
-       exit(EXIT_FAILURE);
+       eprintf("usage: %s [-h] [if=F1] [of=F2] [bsize] [skip=N] [count=N] 
[quiet] [nosync]
", argv0);
 }
 
 static void
@@ -223,6 +223,7 @@ main(int argc, char *argv[])
        char buf[1024];
        struct dd_config config;
 
+       argv0 = argv[0];
        memset(&config, 0, sizeof(config));
        config.bs = 1<<16;
        config.in = "/dev/stdin";
@@ -251,6 +252,8 @@ main(int argc, char *argv[])
                        config.quiet = 1;
                else if (strcmp(argv[i], "nosync") == 0)
                        config.nosync = 1;
+               else if (strcmp(argv[i], "-h") == 0)
+                       usage();
        }
 
        if (!config.in || !config.out)
@@ -260,7 +263,7 @@ main(int argc, char *argv[])
        signal(SIGINT, sig_int);
 
        if (copy(&config) < 0)
-               fprintf(stderr, "Error: %s
", strerror(config.saved_errno));
+               eprintf("copy:");
        print_stat(&config);
 
        if (config.nosync == 0)