What's qLibc?

qLibc is currently one of the most functionally-complete, publicly-licensed C/C++ libraries. The goal of the qLibc project is to provide a simple and powerful general purpose C/C++ library that includes all kinds of containers and general library routines. It provides a ready-made set of common container APIs with a consistent API look.

qLibc is published under the 2-clause BSD license, also known as the Simplified BSD License. Please refer to the LICENSE document included in the package for more details.

qlibc uses GNU AutoTools as the primary tool for compilation. Simply execute the following commands while in the main directory of the project.

./configure
make
sudo make install

qLibc requires at least GNU99 and confirmed to be compiling in GNU23.

• qlibc Core API Reference

  • Containers for Key/Value pairs
    • Tree Table --- in binary tree (left-leaning red-black tree) data structure.
    • Hash Table --- in hash-based data structure.
    • Static Hash Table --- in fixed size memory(array/mmapped/shared).
    • List Table --- in (doubly) linked-list data structure.
  • Containers for Objects
    • List --- Doubly Linked List.
    • Vector --- implements a growable array of elements.
    • Queue --- FIFO(First In First Out) implementation.
    • Stack --- LIFO(Last In First Out) implementation.
  • General utilities.
    • String --- string trimmer, modifier, replacer, case converter, pattern detectors, ...
    • I/O --- non-blocking I/O, stream reader/writer, ...
    • File --- file locking, file/directory handler, path correctors, ...
    • IPC, semaphores, shared memory
    • Encoders/decoders --- URL encoder/decoder, Base64 encoder/decoder, Hex encoder/decoder, ...
    • Hashes --- Murmur hashes, FNV hashes, MD5 hashes, ...
    • Time --- time diff, time format conversion, ...

• qLibc Extension API Reference

  • Apache-style Configuration File Parser.
  • INI-style Configuration File Parser.
  • HTTP client.
  • Rotating File Logger.
  • Database (MySQL) interface.
  • Token-Bucket

All container APIs have a consistent look and feel. It basically provides a creator function which usually returns a pointer to a container structure. Also, all functions related to the container can be accessed through function pointers inside the container or through traditional direct-access APIs.

So, regardless of which container you use, you can simply put elements into a list with container->put(container, ...) or you can call them using direct APIs such as qtreetbl_put(container, ...).

The example below illustrates what it looks like.

  // create a hash-table.
  qhashtbl_t *tbl = qhashtbl(0, QHASHTBL_THREADSAFE);
  
  // add an element whose key is "score".
  int x = 12345;
  tbl->put(tbl, "score", &x, sizeof(int));
  
  // get the value of the element.
  int *px = tbl->get(tbl, "score", NULL, true);
  if(px != NULL) {
    printf("%d\n", *px);
    free(px);
  }
  
  // release table
  tbl->free(tbl);

Here is an identical implementation with a Linked-List-Table container. You may notice that there aren't any code changes at all, except for 1 line in the table creation. This is why qLibc encapsulates corresponding function pointers inside the container object.

  // create a linked-list-table. THE ONLY LINE YOU NEED TO CHANGE.
  qlisttbl_t *tbl = qlisttbl(QLISTTBL_THREADSAFE);
  
  // add an element whose key is "score".
  int x = 12345;
  tbl->put(tbl, "score", &x, sizeof(int));
  
  // get the value of the element.
  int *px = tbl->get(tbl, "score", NULL, true);
  if(px != NULL) {
    printf("%d\n", *px);             
    free(px);
  }
  
  // release table
  tbl->free(tbl);

We're looking for people who want to work together to develop and improve qLibc. Currently, we have high demand in the following areas.

• Automated testing
• Documentation.
• New feature implementation.

The following people have helped with suggestions, ideas, code or fixing bugs: (in alphabetical order by first name)

• Seungyoung "Steve" Kim - Project Lead
• Alexandre Lucchesi
• Anthony Tseng
• Carpentier Pierre-Francois
• Cesar
• Colin
• Charles
• Dmitry Vorobiev
• Fabrice Fontaine
• Fullaxx
• HyoSup Woo
• Keith Rosenberg
• Krishna
• Liu Zhongchao
• Luis Jimenez
• Maik Beckmann
• RQ
• Ryan Gonzalez
• Stroh Snow
• SunBeau
• Umesh

If we have forgotten or misspelled your name, please let us know.