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dynbuf: make *addf() not require extra mallocs

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... by introducing a printf() function that appends directly into a
dynbuf: Curl_dyn_vprintf(). This avoids the mandatory extra malloc so if
the buffer is already big enough it can just printf directly into it.

Since this less-malloc version requires tthe use of a library internal
printf function, we only provide this version when building libcurl and
not for the dynbuf code that is used when building the curl tool.

Closes #5998
This commit is contained in:
Daniel Stenberg 2020-09-22 17:28:34 +02:00
parent 2355857702
commit 7e8561e030
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4 changed files with 45 additions and 18 deletions
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lib/curl_printf.h
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@ -7,7 +7,7 @@
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