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[Qemu-devel] [PATCH v3 06/19] qemu-nbd: Avoid strtol open-coding
From: |
Eric Blake |
Subject: |
[Qemu-devel] [PATCH v3 06/19] qemu-nbd: Avoid strtol open-coding |
Date: |
Sat, 12 Jan 2019 11:57:59 -0600 |
Our copy-and-pasted open-coding of strtol handling forgot to
handle overflow conditions. Use qemu_strto*() instead.
In the case of --partition, since we insist on a user-supplied
partition to be non-zero, we can use 0 rather than -1 for our
initial value to distinguish when a partition is not being
served, for slightly more optimal code.
The error messages for out-of-bounds values are less specific,
but should not be a terrible loss in quality.
Signed-off-by: Eric Blake <address@hidden>
Message-Id: <address@hidden>
---
v3: rebase to use int64_t rather than off_t [Vladimir]
---
qemu-nbd.c | 28 +++++++++-------------------
1 file changed, 9 insertions(+), 19 deletions(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 96c0829970c..4670b659167 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -546,9 +546,8 @@ int main(int argc, char **argv)
};
int ch;
int opt_ind = 0;
- char *end;
int flags = BDRV_O_RDWR;
- int partition = -1;
+ int partition = 0;
int ret = 0;
bool seen_cache = false;
bool seen_discard = false;
@@ -660,9 +659,8 @@ int main(int argc, char **argv)
port = optarg;
break;
case 'o':
- dev_offset = strtoll (optarg, &end, 0);
- if (*end) {
- error_report("Invalid offset `%s'", optarg);
+ if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
+ error_report("Invalid offset '%s'", optarg);
exit(EXIT_FAILURE);
}
break;
@@ -684,13 +682,9 @@ int main(int argc, char **argv)
flags &= ~BDRV_O_RDWR;
break;
case 'P':
- partition = strtol(optarg, &end, 0);
- if (*end) {
- error_report("Invalid partition `%s'", optarg);
- exit(EXIT_FAILURE);
- }
- if (partition < 1 || partition > 8) {
- error_report("Invalid partition %d", partition);
+ if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 ||
+ partition < 1 || partition > 8) {
+ error_report("Invalid partition '%s'", optarg);
exit(EXIT_FAILURE);
}
break;
@@ -711,15 +705,11 @@ int main(int argc, char **argv)
device = optarg;
break;
case 'e':
- shared = strtol(optarg, &end, 0);
- if (*end) {
+ if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
+ shared < 1) {
error_report("Invalid shared device number '%s'", optarg);
exit(EXIT_FAILURE);
}
- if (shared < 1) {
- error_report("Shared device number must be greater than 0");
- exit(EXIT_FAILURE);
- }
break;
case 'f':
fmt = optarg;
@@ -1007,7 +997,7 @@ int main(int argc, char **argv)
}
fd_size -= dev_offset;
- if (partition != -1) {
+ if (partition) {
int64_t limit;
if (dev_offset) {
--
2.20.1
- Re: [Qemu-devel] [PATCH v3 10/19] nbd/client: Split out nbd_send_one_meta_context(), (continued)
- [Qemu-devel] [PATCH v3 13/19] nbd/client: Split handshake into two functions, Eric Blake, 2019/01/12
- [Qemu-devel] [PATCH v3 09/19] nbd/client: Change signature of nbd_negotiate_simple_meta_context(), Eric Blake, 2019/01/12
- [Qemu-devel] [PATCH v3 15/19] nbd/client: Add nbd_receive_export_list(), Eric Blake, 2019/01/12
- [Qemu-devel] [PATCH v3 02/19] qemu-nbd: Enhance man page, Eric Blake, 2019/01/12
- [Qemu-devel] [PATCH v3 06/19] qemu-nbd: Avoid strtol open-coding,
Eric Blake <=
- [Qemu-devel] [PATCH v3 18/19] nbd/client: Work around 3.0 bug for listing meta contexts, Eric Blake, 2019/01/12
[Qemu-devel] [PATCH v3 04/19] nbd/server: Hoist length check to qemp_nbd_server_add, Eric Blake, 2019/01/12