[src/trunk]: src/usr.bin/shmif_dumpbus improve error messages, minor cleanups.

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0655b59b3fe6
branches:  trunk
changeset: 850320:0655b59b3fe6
user:      christos <christos%NetBSD.org@localhost>
date:      Wed Apr 01 21:04:34 2020 +0000

description:
improve error messages, minor cleanups.

diffstat:

 usr.bin/shmif_dumpbus/shmif_dumpbus.c |  61 +++++++++++++++++++---------------
 1 files changed, 34 insertions(+), 27 deletions(-)

diffs (142 lines):

diff -r ed743aa447d7 -r 0655b59b3fe6 usr.bin/shmif_dumpbus/shmif_dumpbus.c
--- a/usr.bin/shmif_dumpbus/shmif_dumpbus.c     Wed Apr 01 20:37:32 2020 +0000
+++ b/usr.bin/shmif_dumpbus/shmif_dumpbus.c     Wed Apr 01 21:04:34 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: shmif_dumpbus.c,v 1.18 2014/11/04 19:05:17 pooka Exp $ */
+/*     $NetBSD: shmif_dumpbus.c,v 1.19 2020/04/01 21:04:34 christos Exp $      */
 
 /*-
  * Copyright (c) 2010 Antti Kantee.  All Rights Reserved.
@@ -33,7 +33,7 @@
 #include <rump/rumpuser_port.h>
 
 #ifndef lint
-__RCSID("$NetBSD: shmif_dumpbus.c,v 1.18 2014/11/04 19:05:17 pooka Exp $");
+__RCSID("$NetBSD: shmif_dumpbus.c,v 1.19 2020/04/01 21:04:34 christos Exp $");
 #endif /* !lint */
 
 #include <sys/types.h>
@@ -64,8 +64,9 @@
 #define getprogname() "shmif_dumpbus"
 #endif
 
-       fprintf(stderr, "usage: %s [-h] [-p pcapfile] buspath\n",getprogname());
-       exit(1);
+       fprintf(stderr, "Usage: %s [-h] [-p pcapfile] buspath\n",
+           getprogname());
+       exit(EXIT_FAILURE);
 }
 
 #define BUFSIZE 64*1024
@@ -101,8 +102,8 @@
        return v;
 }
 
-#define FIXENDIAN32(x) (doswap ? swp32(x) : (x))
-#define FIXENDIAN64(x) (doswap ? swp64(x) : (x))
+#define FIXENDIAN32(x) (doswap ? swp32(x) : (uint32_t)(x))
+#define FIXENDIAN64(x) (doswap ? swp64(x) : (uint64_t)(x))
 
 /* compat for bus version 2 */
 struct shmif_pkthdr2 {
@@ -126,7 +127,7 @@
        bool hflag = false, doswap = false;
        pcap_dumper_t *pdump;
        FILE *dumploc = stdout;
-       int useversion;
+       uint32_t useversion;
 
        setprogname(argv[0]);
        while ((ch = getopt(argc, argv, "hp:")) != -1) {
@@ -150,33 +151,36 @@
 
        buf = malloc(BUFSIZE);
        if (buf == NULL)
-               err(1, "malloc");
+               err(EXIT_FAILURE, "malloc");
 
        fd = open(argv[0], O_RDONLY);
        if (fd == -1)
-               err(1, "open bus");
+               err(EXIT_FAILURE, "Can't open bus file `%s'", argv[0]);
 
        if (fstat(fd, &sb) == -1)
-               err(1, "stat");
+               err(EXIT_FAILURE, "Can't stat bus file `%s'", argv[0]);
 
-       busmem = mmap(NULL, sb.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd, 0);
+       busmem = mmap(NULL, (size_t)sb.st_size, PROT_READ, MAP_FILE|MAP_SHARED,
+           fd, 0);
        if (busmem == MAP_FAILED)
-               err(1, "mmap");
+               err(EXIT_FAILURE, "mmap");
        bmem = busmem;
 
        if (bmem->shm_magic != SHMIF_MAGIC) {
                if (bmem->shm_magic != swp32(SHMIF_MAGIC))
-                       errx(1, "%s not a shmif bus", argv[0]);
+                       errx(EXIT_FAILURE, "%s not a shmif bus: "
+                           "bad magic %#x != %#x", argv[0], bmem->shm_magic,
+                           SHMIF_MAGIC);
                doswap = true;
        }
-       if (FIXENDIAN32(bmem->shm_version) != SHMIF_VERSION) {
-               if (FIXENDIAN32(bmem->shm_version) != 2) {
-                       errx(1, "bus version %d, program %d",
-                           FIXENDIAN32(bmem->shm_version), SHMIF_VERSION);
-               }
-               useversion = 2;
-       } else {
-               useversion = 3;
+       useversion = FIXENDIAN32(bmem->shm_version);
+       switch (useversion) {
+       case 2:
+       case SHMIF_VERSION:
+               break;
+       default:
+               errx(EXIT_FAILURE, "Unhandled bus version %d, program %d",
+                   useversion, SHMIF_VERSION);
        }
 
        if (pcapfile && strcmp(pcapfile, "-") == 0)
@@ -194,8 +198,11 @@
        if (pcapfile) {
                pcap_t *pcap = pcap_open_dead(DLT_EN10MB, 1518);
                pdump = pcap_dump_open(pcap, pcapfile);
-               if (pdump == NULL)
-                       err(1, "cannot open pcap dump file");
+               if (pdump == NULL) {
+                       errx(EXIT_FAILURE,
+                           "Cannot open pcap dump file `%s': %s", pcapfile,
+                           pcap_geterr(pcap));
+               }
        } else {
                /* XXXgcc */
                pdump = NULL;
@@ -252,8 +259,8 @@
                }
 
                fprintf(dumploc, "packet %d, offset 0x%04x, length 0x%04x, "
-                           "ts %d/%06d\n", i++, curbus, curlen,
-                           sp_sec, sp_usec);
+                   "ts %d/%06d\n", i++, curbus, curlen,
+                   sp_sec, sp_usec);
 
                if (!pcapfile) {
                        curbus = shmif_busread(bmem,
@@ -266,7 +273,7 @@
                memset(&packhdr, 0, sizeof(packhdr));
                packhdr.caplen = packhdr.len = curlen;
                packhdr.ts.tv_sec = sp_sec;
-               packhdr.ts.tv_usec = sp_usec;
+               packhdr.ts.tv_usec = (suseconds_t)sp_usec;
                assert(curlen <= BUFSIZE);
 
                curbus = shmif_busread(bmem, buf, curbus, curlen, &wrap);
@@ -278,5 +285,5 @@
        if (pcapfile)
                pcap_dump_close(pdump);
 
-       return 0;
+       return EXIT_SUCCESS;
 }