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conncache: make hashkey avoid malloc #1365

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@bagder bagder commented Mar 28, 2017

... to make it much faster. Idea developed with primepie on IRC.

... to make it much faster. Idea developed with primepie on IRC.
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@mention-bot mention-bot commented Mar 28, 2017

@bagder, thanks for your PR! By analyzing the history of the files in this pull request, we identified @yangtse, @linusnielsen and @mkauf to be potential reviewers.

DEBUGASSERT(len > 32);

/* put the number first so that the hostname gets cut off if too long */
snprintf(buf, len, "%ld%s", conn->port, hostname);

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@MarcelRaad

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Isn't snprintf C99? I believe MSVC versions prior to 2015 only have a _snprintf that doesn't append a '\0' if the string gets truncated.

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bagder Mar 28, 2017
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That's one of the reasons why have our own set of *printf() implementations and snprintf comes from here: https://github.com/curl/curl/blob/master/lib/curlx.h#L105

If you check the code closer you'll see that we already use snprintf() in numerous places thanks to this.

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@MarcelRaad

MarcelRaad Mar 28, 2017
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Ah, great! I forgot about that.

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@MarcelRaad MarcelRaad left a comment

Good idea!

@@ -128,7 +128,8 @@ void Curl_conncache_destroy(struct conncache *connc)
}

/* returns an allocated key to find a bundle for this connection */

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@bagder

bagder Mar 28, 2017
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I'll fix the comment too.

@bagder bagder closed this in 2066072 Mar 28, 2017
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@bagder bagder commented Mar 28, 2017

thanks for the review!

@bagder bagder deleted the bagder/improve-hashkey branch Mar 29, 2017
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