* [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
@ 2019-05-16 5:41 Mesut Ali Ergin
2019-05-16 5:41 ` Mesut Ali Ergin
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Mesut Ali Ergin @ 2019-05-16 5:41 UTC (permalink / raw)
To: olivier.matz; +Cc: dev, Mesut Ali Ergin
When arguments delimited with RTE_KVARGS_PAIRS_DELIM happen to have
spaces before and after the delimiter, the rte_kvargs_process() can not
match them to the intended key. For example, the first argument below
triggers the support-multi-driver handler as expected, but the second
one silently fails to do so.
-w '84:00.0,support-multi-driver=1'
-w '84:00.0, support-multi-driver=1'
Signed-off-by: Mesut Ali Ergin <mesut.a.ergin@intel.com>
---
lib/librte_kvargs/rte_kvargs.c | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c
index f7030c6..1f45bc6 100644
--- a/lib/librte_kvargs/rte_kvargs.c
+++ b/lib/librte_kvargs/rte_kvargs.c
@@ -10,6 +10,32 @@
#include "rte_kvargs.h"
+
+/* trim leading and trailing spaces */
+static char *
+trim_space(char *str)
+{
+ char *start, *end;
+
+ for (start = str; *start; start++) {
+ if (!isspace((unsigned char) start[0]))
+ break;
+ }
+
+ for (end = start + strlen(start); end > start + 1; end--) {
+ if (!isspace((unsigned char) end[-1]))
+ break;
+ }
+
+ *end = 0;
+
+ /* Shift from "start" to the beginning of the string */
+ if (start > str)
+ memmove(str, start, (end - start) + 1);
+
+ return str;
+}
+
/*
* Receive a string with a list of arguments following the pattern
* key=value,key=value,... and insert them into the list.
@@ -38,8 +64,10 @@ rte_kvargs_tokenize(struct rte_kvargs *kvlist, const char *params)
if (i >= RTE_KVARGS_MAX)
return -1;
- kvlist->pairs[i].key = strtok_r(str, RTE_KVARGS_KV_DELIM, &ctx2);
- kvlist->pairs[i].value = strtok_r(NULL, RTE_KVARGS_KV_DELIM, &ctx2);
+ kvlist->pairs[i].key = trim_space(strtok_r(str,
+ RTE_KVARGS_KV_DELIM, &ctx2));
+ kvlist->pairs[i].value = trim_space(strtok_r(NULL,
+ RTE_KVARGS_KV_DELIM, &ctx2));
if (kvlist->pairs[i].key == NULL ||
kvlist->pairs[i].value == NULL)
return -1;
--
2.7.4
^ permalink raw reply [flat|nested] 6+ messages in thread* [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
2019-05-16 5:41 [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values Mesut Ali Ergin
@ 2019-05-16 5:41 ` Mesut Ali Ergin
2019-05-16 16:36 ` Stephen Hemminger
2019-07-01 13:10 ` Olivier Matz
2 siblings, 0 replies; 6+ messages in thread
From: Mesut Ali Ergin @ 2019-05-16 5:41 UTC (permalink / raw)
To: olivier.matz; +Cc: dev, Mesut Ali Ergin
When arguments delimited with RTE_KVARGS_PAIRS_DELIM happen to have
spaces before and after the delimiter, the rte_kvargs_process() can not
match them to the intended key. For example, the first argument below
triggers the support-multi-driver handler as expected, but the second
one silently fails to do so.
-w '84:00.0,support-multi-driver=1'
-w '84:00.0, support-multi-driver=1'
Signed-off-by: Mesut Ali Ergin <mesut.a.ergin@intel.com>
---
lib/librte_kvargs/rte_kvargs.c | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c
index f7030c6..1f45bc6 100644
--- a/lib/librte_kvargs/rte_kvargs.c
+++ b/lib/librte_kvargs/rte_kvargs.c
@@ -10,6 +10,32 @@
#include "rte_kvargs.h"
+
+/* trim leading and trailing spaces */
+static char *
+trim_space(char *str)
+{
+ char *start, *end;
+
+ for (start = str; *start; start++) {
+ if (!isspace((unsigned char) start[0]))
+ break;
+ }
+
+ for (end = start + strlen(start); end > start + 1; end--) {
+ if (!isspace((unsigned char) end[-1]))
+ break;
+ }
+
+ *end = 0;
+
+ /* Shift from "start" to the beginning of the string */
+ if (start > str)
+ memmove(str, start, (end - start) + 1);
+
+ return str;
+}
+
/*
* Receive a string with a list of arguments following the pattern
* key=value,key=value,... and insert them into the list.
@@ -38,8 +64,10 @@ rte_kvargs_tokenize(struct rte_kvargs *kvlist, const char *params)
if (i >= RTE_KVARGS_MAX)
return -1;
- kvlist->pairs[i].key = strtok_r(str, RTE_KVARGS_KV_DELIM, &ctx2);
- kvlist->pairs[i].value = strtok_r(NULL, RTE_KVARGS_KV_DELIM, &ctx2);
+ kvlist->pairs[i].key = trim_space(strtok_r(str,
+ RTE_KVARGS_KV_DELIM, &ctx2));
+ kvlist->pairs[i].value = trim_space(strtok_r(NULL,
+ RTE_KVARGS_KV_DELIM, &ctx2));
if (kvlist->pairs[i].key == NULL ||
kvlist->pairs[i].value == NULL)
return -1;
--
2.7.4
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
2019-05-16 5:41 [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values Mesut Ali Ergin
2019-05-16 5:41 ` Mesut Ali Ergin
@ 2019-05-16 16:36 ` Stephen Hemminger
2019-05-16 20:55 ` Ergin, Mesut A
2019-07-01 13:10 ` Olivier Matz
2 siblings, 1 reply; 6+ messages in thread
From: Stephen Hemminger @ 2019-05-16 16:36 UTC (permalink / raw)
To: Mesut Ali Ergin; +Cc: olivier.matz, dev
On Wed, 15 May 2019 22:41:07 -0700
Mesut Ali Ergin <mesut.a.ergin@intel.com> wrote:
> +/* trim leading and trailing spaces */
> +static char *
> +trim_space(char *str)
> +{
> + char *start, *end;
> +
> + for (start = str; *start; start++) {
> + if (!isspace((unsigned char) start[0]))
> + break;
> + }
> +
> + for (end = start + strlen(start); end > start + 1; end--) {
> + if (!isspace((unsigned char) end[-1]))
> + break;
> + }
> +
Why not use existing string functions like strspn?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
2019-05-16 16:36 ` Stephen Hemminger
@ 2019-05-16 20:55 ` Ergin, Mesut A
2019-05-16 23:18 ` Stephen Hemminger
0 siblings, 1 reply; 6+ messages in thread
From: Ergin, Mesut A @ 2019-05-16 20:55 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: olivier.matz, dev
> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Thursday, May 16, 2019 9:37 AM
> To: Ergin, Mesut A <mesut.a.ergin@intel.com>
> Cc: olivier.matz@6wind.com; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of
> key and values
>
> On Wed, 15 May 2019 22:41:07 -0700
> Mesut Ali Ergin <mesut.a.ergin@intel.com> wrote:
>
> > +/* trim leading and trailing spaces */
> > +static char *
> > +trim_space(char *str)
> > +{
> > + char *start, *end;
> > +
> > + for (start = str; *start; start++) {
> > + if (!isspace((unsigned char) start[0]))
> > + break;
> > + }
> > +
> > + for (end = start + strlen(start); end > start + 1; end--) {
> > + if (!isspace((unsigned char) end[-1]))
> > + break;
> > + }
> > +
>
> Why not use existing string functions like strspn?
Had no particular reason not to use strspn. This was in use/tested in two apps shipping already, and I took the easy route. I could modify if you think it will be better.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
2019-05-16 20:55 ` Ergin, Mesut A
@ 2019-05-16 23:18 ` Stephen Hemminger
0 siblings, 0 replies; 6+ messages in thread
From: Stephen Hemminger @ 2019-05-16 23:18 UTC (permalink / raw)
To: Ergin, Mesut A; +Cc: olivier.matz, dev
On Thu, 16 May 2019 20:55:10 +0000
"Ergin, Mesut A" <mesut.a.ergin@intel.com> wrote:
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Thursday, May 16, 2019 9:37 AM
> > To: Ergin, Mesut A <mesut.a.ergin@intel.com>
> > Cc: olivier.matz@6wind.com; dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of
> > key and values
> >
> > On Wed, 15 May 2019 22:41:07 -0700
> > Mesut Ali Ergin <mesut.a.ergin@intel.com> wrote:
> >
> > > +/* trim leading and trailing spaces */
> > > +static char *
> > > +trim_space(char *str)
> > > +{
> > > + char *start, *end;
> > > +
> > > + for (start = str; *start; start++) {
> > > + if (!isspace((unsigned char) start[0]))
> > > + break;
> > > + }
> > > +
> > > + for (end = start + strlen(start); end > start + 1; end--) {
> > > + if (!isspace((unsigned char) end[-1]))
> > > + break;
> > > + }
> > > +
> >
> > Why not use existing string functions like strspn?
>
> Had no particular reason not to use strspn. This was in use/tested in two apps shipping already, and I took the easy route. I could modify if you think it will be better.
writing your own string handling code is often a source of bugs
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values
2019-05-16 5:41 [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values Mesut Ali Ergin
2019-05-16 5:41 ` Mesut Ali Ergin
2019-05-16 16:36 ` Stephen Hemminger
@ 2019-07-01 13:10 ` Olivier Matz
2 siblings, 0 replies; 6+ messages in thread
From: Olivier Matz @ 2019-07-01 13:10 UTC (permalink / raw)
To: Mesut Ali Ergin; +Cc: dev
Hi,
On Wed, May 15, 2019 at 10:41:07PM -0700, Mesut Ali Ergin wrote:
> When arguments delimited with RTE_KVARGS_PAIRS_DELIM happen to have
> spaces before and after the delimiter, the rte_kvargs_process() can not
> match them to the intended key. For example, the first argument below
> triggers the support-multi-driver handler as expected, but the second
> one silently fails to do so.
>
> -w '84:00.0,support-multi-driver=1'
> -w '84:00.0, support-multi-driver=1'
>
> Signed-off-by: Mesut Ali Ergin <mesut.a.ergin@intel.com>
> ---
> lib/librte_kvargs/rte_kvargs.c | 32 ++++++++++++++++++++++++++++++--
> 1 file changed, 30 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c
> index f7030c6..1f45bc6 100644
> --- a/lib/librte_kvargs/rte_kvargs.c
> +++ b/lib/librte_kvargs/rte_kvargs.c
> @@ -10,6 +10,32 @@
>
> #include "rte_kvargs.h"
>
> +
> +/* trim leading and trailing spaces */
> +static char *
> +trim_space(char *str)
> +{
> + char *start, *end;
> +
> + for (start = str; *start; start++) {
> + if (!isspace((unsigned char) start[0]))
> + break;
> + }
> +
> + for (end = start + strlen(start); end > start + 1; end--) {
> + if (!isspace((unsigned char) end[-1]))
> + break;
> + }
> +
> + *end = 0;
> +
> + /* Shift from "start" to the beginning of the string */
> + if (start > str)
> + memmove(str, start, (end - start) + 1);
> +
> + return str;
> +}
> +
> /*
> * Receive a string with a list of arguments following the pattern
> * key=value,key=value,... and insert them into the list.
> @@ -38,8 +64,10 @@ rte_kvargs_tokenize(struct rte_kvargs *kvlist, const char *params)
> if (i >= RTE_KVARGS_MAX)
> return -1;
>
> - kvlist->pairs[i].key = strtok_r(str, RTE_KVARGS_KV_DELIM, &ctx2);
> - kvlist->pairs[i].value = strtok_r(NULL, RTE_KVARGS_KV_DELIM, &ctx2);
> + kvlist->pairs[i].key = trim_space(strtok_r(str,
> + RTE_KVARGS_KV_DELIM, &ctx2));
> + kvlist->pairs[i].value = trim_space(strtok_r(NULL,
> + RTE_KVARGS_KV_DELIM, &ctx2));
> if (kvlist->pairs[i].key == NULL ||
> kvlist->pairs[i].value == NULL)
> return -1;
Having a space in the kwvargs strings like in your example
(-w '84:00.0, support-multi-driver=1') is wrong. I don't think we should
fix this in kvargs library.
I you feel it is necessary, we could potentially add a comment in the API
description to highlight this.
Thanks,
Olivier
^ permalink raw reply [flat|nested] 6+ messages in thread
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2019-05-16 5:41 [dpdk-dev] [PATCH] kvargs: trim spaces at the beginning and end of key and values Mesut Ali Ergin
2019-05-16 5:41 ` Mesut Ali Ergin
2019-05-16 16:36 ` Stephen Hemminger
2019-05-16 20:55 ` Ergin, Mesut A
2019-05-16 23:18 ` Stephen Hemminger
2019-07-01 13:10 ` Olivier Matz
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