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qs_parse

Description

A set of simple and easy functions for parsing URL query strings, such as those generated in an HTTP GET form submission.

How to Use

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]

Installation

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

Bugs, etc.

Please let me know if you find any, or if you have license-friendly enhancements to add.

License

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:

[email protected]

Enjoy!

-Bart

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Simple HTTP query string parsing library in C

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