11:16 a.m.
Stop repeating fprintf(stderr, "..."); exit(EXIT_FAILURE).
Signed-off-by: Nir Soffer <nsoffer(a)redhat.com>
---
examples/copy-libev.c | 79 +++++++++++++++++++------------------------
1 file changed, 34 insertions(+), 45 deletions(-)
diff --git a/examples/copy-libev.c b/examples/copy-libev.c
index 034711a..70a9811 100644
--- a/examples/copy-libev.c
+++ b/examples/copy-libev.c
@@ -17,8 +17,10 @@
*/
#include <assert.h>
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
#include <libnbd.h>
@@ -42,10 +44,18 @@
#define MIN(a,b) (a) < (b) ? (a) : (b)
-#define DEBUG(fmt, ...) \
- do { \
- if (debug) \
- fprintf (stderr, "copy-libev: " fmt "\n", ## __VA_ARGS__);
\
+#define PROG "copy-libev"
+
+#define DEBUG(fmt, ...) \
+ do { \
+ if (debug) \
+ fprintf (stderr, PROG ": " fmt "\n", ## __VA_ARGS__); \
+ } while (0)
+
+#define FAIL(fmt, ...) \
+ do { \
+ fprintf (stderr, PROG ": " fmt "\n", ## __VA_ARGS__); \
+ exit (EXIT_FAILURE); \
} while (0)
struct connection {
@@ -111,10 +121,8 @@ start_read(struct request *r)
(nbd_completion_callback) { .callback=read_completed,
.user_data=r },
0);
- if (cookie == -1) {
- fprintf (stderr, "start_read: %s", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (cookie == -1)
+ FAIL ("Cannot start read: %s", nbd_get_error ());
offset += r->length;
}
@@ -133,10 +141,8 @@ read_completed (void *user_data, int *error)
(nbd_completion_callback) { .callback=write_completed,
.user_data=r },
0);
- if (cookie == -1) {
- fprintf (stderr, "read_completed: %s", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (cookie == -1)
+ FAIL ("Cannot start write: %s", nbd_get_error ());
return 1;
}
@@ -207,44 +213,31 @@ main (int argc, char *argv[])
loop = EV_DEFAULT;
- if (argc != 3) {
- fprintf (stderr, "Usage: copy-ev src-uri dst-uri\n");
- exit (EXIT_FAILURE);
- }
+ if (argc != 3)
+ FAIL ("Usage: %s src-uri dst-uri", PROG);
src.nbd = nbd_create ();
- if (src.nbd == NULL) {
- fprintf (stderr, "nbd_create: %s\n", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
-
+ if (src.nbd == NULL)
+ FAIL ("Cannot create source: %s", nbd_get_error ());
dst.nbd = nbd_create ();
- if (dst.nbd == NULL) {
- fprintf (stderr, "nbd_create: %s\n", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (dst.nbd == NULL)
+ FAIL ("Cannot create destination: %s", nbd_get_error ());
debug = nbd_get_debug (src.nbd);
/* Connecting is fast, so use the syncronous API. */
- if (nbd_connect_uri (src.nbd, argv[1])) {
- fprintf (stderr, "nbd_connect_uri: %s\n", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (nbd_connect_uri (src.nbd, argv[1]))
+ FAIL ("Cannot connect to source: %s", nbd_get_error ());
- if (nbd_connect_uri (dst.nbd, argv[2])) {
- fprintf (stderr, "nbd_connect_uri: %s\n", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (nbd_connect_uri (dst.nbd, argv[2]))
+ FAIL ("Cannot connect to destination: %s", nbd_get_error ());
size = nbd_get_size (src.nbd);
- if (size > nbd_get_size (dst.nbd)) {
- fprintf (stderr, "destinatio is not large enough\n");
- exit (EXIT_FAILURE);
- }
+ if (size > nbd_get_size (dst.nbd))
+ FAIL ("Destinatio is not large enough\n");
/* Start the copy "loop". When request completes, it starts the
* next request, until entire image was copied. */
@@ -253,10 +246,8 @@ main (int argc, char *argv[])
struct request *r = &requests[i];
r->data = malloc (REQUEST_SIZE);
- if (r->data == NULL) {
- perror ("malloc");
- exit (EXIT_FAILURE);
- }
+ if (r->data == NULL)
+ FAIL ("Cannot allocate buffer: %s", strerror (errno));
start_read(r);
}
@@ -285,10 +276,8 @@ main (int argc, char *argv[])
/* Copy completed - flush data to storage. */
DEBUG("flush");
- if (nbd_flush (dst.nbd, 0)) {
- fprintf (stderr, "Cannot flush: %s", nbd_get_error ());
- exit (EXIT_FAILURE);
- }
+ if (nbd_flush (dst.nbd, 0))
+ FAIL ("Cannot flush: %s", nbd_get_error ());
/* We don't care about errors here since data was flushed. */
--
2.26.2