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curlx explained

This contents is from the curl/lib/README.curlx file.

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                             / __| | | | |_) | |
                            | (__| |_| |  _ <| |___
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                     Source Code Functions Apps Might Use
                     ====================================
 
The libcurl source code offers a few functions by source only. They are not
part of the official libcurl API, but the source files might be useful for
others so apps can optionally compile/build with these sources to gain
additional functions.
 
We provide them through a single header file for easy access for apps:
"curlx.h"
 
 curlx_strtoofft()
 
   A macro that converts a string containing a number to a curl_off_t number.
   This might use the curlx_strtoll() function which is provided as source
   code in strtoofft.c. Note that the function is only provided if no
   strtoll() (or equivalent) function exist on your platform. If curl_off_t
   is only a 32 bit number on your platform, this macro uses strtol().
 
 curlx_tvnow()
 
   returns a struct timeval for the current time.
 
 curlx_tvdiff()
 
   returns the difference between two timeval structs, in number of
   milliseconds.
 
 curlx_tvdiff_secs()
 
   returns the same as curlx_tvdiff but with full usec resolution (as a
   double)
 
FUTURE
======
 
 Several functions will be removed from the public curl_ name space in a
 future libcurl release. They will then only become available as curlx_
 functions instead. To make the transition easier, we already today provide
 these functions with the curlx_ prefix to allow sources to get built properly
 with the new function names. The functions this concerns are:
 
      curlx_getenv
      curlx_strequal
      curlx_strnequal
      curlx_mvsnprintf
      curlx_msnprintf
      curlx_maprintf
      curlx_mvaprintf
      curlx_msprintf
      curlx_mprintf
      curlx_mfprintf
      curlx_mvsprintf
      curlx_mvprintf
      curlx_mvfprintf