[PATCH] progress.c: avoid use of dynamic-sized array

Dynamically sized arrays are gcc and C99 construct.  Using them hurts
portability to older compilers, although using them is nice in this case
it is not desirable.  This patch removes the only use of the construct
in stop_progress_msg(); the function is about writing out a single line
of a message, and the existing callers of this function feed messages
of only bounded size anyway, so use of dynamic array is simply overkill.

Signed-off-by: Boyd Lynn Gerber <redacted>

--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

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---
progress.c

diff --git a/progress.c b/progress.c
index d19f80c..55a8687 100644
--- a/progress.c
+++ b/progress.c

@@ -241,16 +241,21 @@ void stop_progress_msg(struct progress **p_progress, const char *msg)
 	*p_progress = NULL;
 	if (progress->last_value != -1) {
 		/* Force the last update */
-		char buf[strlen(msg) + 5];
+		char buf[128], *bufp;
+		size_t len = strlen(msg) + 5;
 		struct throughput *tp = progress->throughput;
+
+		bufp = (len < sizeof(buf)) ? buf : xmalloc(len + 1);
 		if (tp) {
 			unsigned int rate = !tp->avg_misecs ? 0 :
 					tp->avg_bytes / tp->avg_misecs;
 			throughput_string(tp, tp->curr_total, rate);
 		}
 		progress_update = 1;
-		sprintf(buf, ", %s.\n", msg);
-		display(progress, progress->last_value, buf);
+		sprintf(bufp, ", %s.\n", msg);
+		display(progress, progress->last_value, bufp);
+		if (buf != bufp)
+			free(bufp);
 	}
 	clear_progress_signal();
 	free(progress->throughput);

-- 
1.5.2.4


--
Boyd Gerber <gerberb@zenez.com>
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

Hi,

On Sun, 8 Jun 2008, Boyd Lynn Gerber wrote:

Dynamically sized arrays are gcc and C99 construct.  Using them hurts
portability to older compilers, although using them is nice in this case
it is not desirable.  This patch removes the only use of the construct
in stop_progress_msg(); the function is about writing out a single line
of a message, and the existing callers of this function feed messages
of only bounded size anyway, so use of dynamic array is simply overkill.

Signed-off-by: Boyd Lynn Gerber <redacted>

--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

---

Do you really want to have your mail signature in the commit message, 
particularly because...

[...]

 	clear_progress_signal();
 	free(progress->throughput);
-- 
1.5.2.4


--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047
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You repeat it at the end of the mail anyway?

The patch looks fine to me, though.

Ciao,
Dscho

On Sun, 8 Jun 2008, Johannes Schindelin wrote:

On Sun, 8 Jun 2008, Boyd Lynn Gerber wrote:

quoted

Dynamically sized arrays are gcc and C99 construct.  Using them hurts
portability to older compilers, although using them is nice in this case
it is not desirable.  This patch removes the only use of the construct
in stop_progress_msg(); the function is about writing out a single line
of a message, and the existing callers of this function feed messages
of only bounded size anyway, so use of dynamic array is simply overkill.

Signed-off-by: Boyd Lynn Gerber <redacted>

--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

---

Do you really want to have your mail signature in the commit message, 
particularly because...

quoted

[...]

 	clear_progress_signal();
 	free(progress->throughput);
-- 
1.5.2.4


--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

You repeat it at the end of the mail anyway?

The patch looks fine to me, though.

I put it in because in the git repo it is not their.  Only in the email.  
It is fine to remove it.

--
Boyd Gerber [off-list ref]
ZENEZ	1042 East Fort Union #135, Midvale Utah  84047

Boyd Lynn Gerber, Sun, Jun 08, 2008 17:26:15 +0200:

 		/* Force the last update */
-		char buf[strlen(msg) + 5];
+		char buf[128], *bufp;
+		size_t len = strlen(msg) + 5;
 		struct throughput *tp = progress->throughput;
+
+		bufp = (len < sizeof(buf)) ? buf : xmalloc(len + 1);

It is just a temporary buffer, there is no urgent need to
micro-optimize the allocation like that. Maybe just leave
one of the buffers, the one on stack? It is just a progress
message, snprintf will cut it, yes, but it is unlikely to
cause any harm (unless you forget to \n-terminate it).

Quoting Boyd Lynn Gerber [off-list ref]:

Dynamically sized arrays are gcc and C99 construct.  Using them hurts
portability to older compilers, although using them is nice in this case
it is not desirable.  This patch removes the only use of the construct
in stop_progress_msg(); the function is about writing out a single line
of a message, and the existing callers of this function feed messages
of only bounded size anyway, so use of dynamic array is simply overkill.

Signed-off-by: Boyd Lynn Gerber <redacted>

I may be mistaken but isn't this Junio's patch?  If so (quoting
from SubmittingPatches document):

  If you are forwarding a patch from somebody else, optionally, at
  the beginning of the e-mail message just before the commit
  message starts, you can put a "From: " line to name that person.

-- 
Nanako Shiraishi
http://ivory.ap.teacup.com/nanako3/

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しらいしななこ  [off-list ref] writes:

Quoting Boyd Lynn Gerber [off-list ref]:

quoted

Dynamically sized arrays are gcc and C99 construct.  Using them hurts
portability to older compilers, although using them is nice in this case
it is not desirable.  This patch removes the only use of the construct
in stop_progress_msg(); the function is about writing out a single line
of a message, and the existing callers of this function feed messages
of only bounded size anyway, so use of dynamic array is simply overkill.

Signed-off-by: Boyd Lynn Gerber <redacted>

I may be mistaken but isn't this Junio's patch?  If so (quoting
from SubmittingPatches document):

  If you are forwarding a patch from somebody else, optionally, at
  the beginning of the e-mail message just before the commit
  message starts, you can put a "From: " line to name that person.

Heh, thanks for being picky ;-)

Something this small, either way is fine by me.  Besides, I've applied the
patch (and the other one) from Boyd already.