Please describe in detail the 50 C language open source libraries and the common interface functions they provide?
The following are 50 commonly used C language open source libraries and the common interface functions they provide:
1. Standard C Library (libc) - Provides many basic functions, including string operations, mathematical functions, etc. For example: memset, memcpy, strlen, printf, etc.
2. GNU C Library (glibc) - Similar to libc, but also provides extensions to the POSIX standard. For example: fopen, fseek, socket, etc.
3. OpenSSL - A library that provides encryption and decryption functions, such as MD5 encryption, RSA encryption, etc. For example: MD5, SHA256, AES, etc.
4. Libxml2 - A library that provides XML document parsing and generation functions. For example: xmlParseFile, xmlNewDoc, xmlSaveFormatFile, etc.
5. Libcurl - A library that provides HTTP protocol client functions. For example: curl_easy_init, curl_easy_setopt, curl_easy_perform, etc.
6. GTK+ - Provides a graphical user interface (GUI) toolset. For example: gtk_window_new, gtk_button_new_with_label, gtk_text_view_new, etc.
7. Qt - Another popular GUI toolset with cross-platform support. For example: QApplication, QWidget, QPushButton, etc.
8. SDL - Provides a cross-platform multimedia library for game development, etc. For example: SDL_Init, SDL_CreateWindow, SDL_RenderCopy, etc.
9. OpenGL - Provides a 3D graphics library. For example: glGenBuffers, glBufferData, glUniformMatrix4fv, etc.
10. OpenAL - provides a sound library. For example: alSourcePlay, alGenSources, alListenerf, etc.
11. Libevent - Provides an event-driven programming library. For example: event_base_new, event_add, event_set, etc.
12. libpng - Provides reading and writing functions for PNG image format. For example: png_create_read_struct, png_create_info_struct, png_write_image, etc.
13. libjpeg - Provides reading and writing functions for JPEG image format. For example: jpeg_create_compress, jpeg_start_compress, jpeg_write_scanlines, etc.
14. zlib - Provides data compression and decompression functions. For example: zlibVersion, deflateInit2, inflateInit2, etc.
15. Berkeley DB - Provides a local database and supports key-value storage. For example: db_create, db_put, db_get, etc.
16. MySQL - Provides MySQL database access API. For example: mysql_init, mysql_real_connect, mysql_query, etc.
17. PostgreSQL - Provides PostgreSQL database access API. For example: PQconnectdb, PQexec, PQgetvalue, etc.
18. MongoDB - Provides MongoDB database access API. For example: mongoc_client_new, mongoc_collection_find_one, bson_iter_init, etc.
19. SQLite - Provides a lightweight embedded database that does not require a separate server process. For example: sqlite3_open, sqlite3_exec, sqlite3_prepare_v2, etc.
20. Boost - Provides multiple C++ libraries, including threads, file systems, date and time, regular expressions, etc. For example: boost::thread, boost::filesystem, boost::date_time, etc.
21. ZeroMQ - Provides high-performance message queue middleware. For example: zmq_ctx_new, zmq_socket, zmq_bind, etc.
22. APR - Provides cross-platform, object-oriented API, including memory pools, threads, etc. For example: apr_pool_create, apr_thread_create, apr_file_open, etc.
23. Libxml++ - A C++ library that provides XML document parsing and generation functions. For example: Xml::DomParser, Xml::Document, Xml::Element, etc.
24. POCO - Provides multiple C++ libraries, including network, file system, database, etc. For example: Poco::Net::HTTPClientSession, Poco::File, Poco::Data::Session, etc.
25. GMP - Provides large number calculation capabilities. For example: mpz_init, mpz_add, mpz_tdiv_qr, etc.
26. GNU readline - Provides a command line interactive tool library. For example: readline, add_history, rl_callback_read_char, etc.
27. ncurses - Provides a terminal interface control library. For example: initscr, mvprintw, getch, etc.
28. libuuid - Provides a UUID generation library. For example: uuid_generate, uuid_unparse, uuid_compare, etc.
29. libsigc++ - C++ library that provides signals and slots mechanism. For example: sigc::signal, sigc::slot, sigc::mem_fun, etc.
30. ACE - Provides an object-oriented communication library, including multiple protocols. For example: ACE_SOCK_Acceptor, ACE_Message_Queue, ACE_Task_Base, etc.
31. libevent2 - An improved version of libevent, providing a more efficient event-driven programming library. For example: event_base_new_with_config, evbuffer_new, bufferevent_socket_new, etc.
32. libzip - Provides ZIP file reading and writing functions. For example: zip_open, zip_fopen_index, zip_file_add, etc.
33. libarchive - Provides reading and writing functions for multiple archive formats, including tar, gzip, zip, etc. For example: archive_read_new, archive_read_support_filter_all, archive_read_extract, etc.
34. Apache Portable Runtime (APR) Util - APR's extension library provides functions such as string and data structure processing. For example: apr_hash_make, apr_strtok, apr_time_t, etc.
35. Cairo - Provides a 2D drawing library. For example: cairo_create, cairo_surface_create_for_image, cairo_set_source_rgb, etc.
36. FreeType - Provides a font rendering library. For example: FT_Init_FreeType, FT_New_Face, FT_Load_Char, etc.
37. libsndfile - Provides audio file reading and writing functions and supports multiple formats. For example: sf_open, sf_read_short, sf_write_float, etc.
38. libwebsockets - Provides client and server implementations of the WebSocket protocol. For example: lws_create_context, lws_client_connect, lws_callback_on_writable, etc.
39. mbedtls - Provides encryption and decryption functions, as well as TLS protocol implementation. For example: mbedtls_md_init, mbedtls_ecp_gen_key, mbedtls_ssl_handshake, etc.
40. libgphoto2 - Provides a camera access library. For example: gp_camera_new, gp_camera_capture_preview, gp_file_new, etc.
41. libusb - Provides USB device access library. For example: libusb_init, libusb_get_device_list, libusb_claim_interface, etc.
42. libpcap - Provides a network packet capture library. For example: pcap_lookupdev, pcap_open_live, pcap_next, etc.
43. libnet - Provides a network protocol package construction library. For example: libnet_init, libnet_build_tcp, libnet_write, etc.
44. libssh2 - Provides SSH protocol client functionality. For example: libssh2_init, libssh2_session_handshake, libssh2_channel_open_ex, etc.
45. libsoup - Provides HTTP protocol client and server implementations. For example: soup_session_new, soup_message_headers_append, soup_server_listen_all, etc.
46. libgpg-error - Provides GnuPG error handling library. For example: gpg_err_set_errno, gpg_strerror, gpg_strerror_r, etc.
47. libgcrypt - Provides encryption and decryption functions, as well as public key encryption and signature functions. For example: gcry_cipher_open, gcry_cipher_encrypt, gcry_pk_sign, etc.
48. libxmlsec - Provides XML encryption and digital signature functions. For example: xmlSecInit, xmlSecDigestCreate, xmlSecDSigCtxSign etc.
49. libgnutls - Provides TLS protocol implementation and encryption and decryption functions. For example: gnutls_global_init, gnutls_certificate_set_x509_trust_file, gnutls_handshake, etc.
50. libxslt - Provides an XSLT conversion library for converting XML documents to other formats. For example: xsltParseStylesheetDoc, xsltApplyStylesheet, xsltSaveResultToFile, etc.
The list of these open source libraries represents only a few, each library provides more functions and capabilities. When using these libraries, it is recommended to read the official documentation carefully and understand their usage and limitations.