A set of simple and easy functions for parsing URL query strings, such as those generated in an HTTP GET form submission.
These qs_* functions can be used in two different ways:
qs_parse()/qs_k2v(): A faster version that requires a pre-processing stage
and is destructive to the query string
- Better for repeated lookups of k/v pairs
- Does all decoding/processing in-place, so no memory copying
- Requires an array of pointers to strings to be passed to the preprocessing stage
- Cannot be used where the query string is const
qs_scanvalue(): A slower version that will scan for the given key and will
decode the value into a user-provided string
- Doesn't alter the query string so can be used where it is const, or cannot be altered
- Only needs a user-passed char string for copying into
- Scans the entire qs on each call, so isn't as fast as qs_k2v()
Since qs_parse()/qs_k2v() alters the query string that is passed to it in a way
that defeats qs_scanvalue(), do not mix these two methods (or if you must,
either don't call qs_scanvalue() after a call to qs_parse() or be sure make
a copy of the query string beforehand)
[note: speed comparisons will be more relevant when the sorting the k/v pairs code is implemented]
All you really need is qs_parse.h and qs_parse.c. I've included my test program ("qs_test.c") and an example program that shows how to use these functions ("qs_example.c"). Also included is a quick Makefile. If you want to see it come to life just get all the files and:
# make
# ./qs_example
Please let me know if you find any, or if you have license-friendly enhancements to add.
MIT License. See ./LICENSE or http://www.opensource.org/licenses/mit-license.php
Few things are more enjoyable than the knowledge that you've helped another person. If you do use these functions for anything, I'd love to hear about it:
Enjoy!
-Bart