Editing C standard library (section)

=== BSD libc ===
'''BSD libc''' is a superset of the POSIX standard library supported by the C libraries included with [[BSD]] [[operating system]]s such as [[FreeBSD]], [[NetBSD]], [[OpenBSD]] and [[macOS]]. BSD libc has some extensions that are not defined in the original standard, many of which first appeared in 1994's [[BSD#4.4BSD and descendants|4.4BSD]] release (the first to be largely developed after the first standard was issued in 1989). Some of the extensions of BSD libc are:

* <code>sys/tree.h</code>{{snd}} contains an implementation of [[red–black tree]] and [[splay tree]]<ref>{{cite web |url=http://man.freebsd.org/tree |title=tree |website=Man.freebsd.org |date=27 December 2007 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/sys/sys/tree.h |title=Super User's BSD Cross Reference: /OpenBSD/sys/sys/tree.h |website=bxr.su}}</ref>
* <code>sys/queue.h</code>{{snd}} implementations of [[Linked list]], [[queue (data structure)|queues]], [[tail queue]], etc.<ref>{{cite web |url=http://man.freebsd.org/queue |title=queue |website=Man.freebsd.org |date=13 May 2011 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/sys/sys/queue.h |title=Super User's BSD Cross Reference: /OpenBSD/sys/sys/queue.h |website=bxr.su}}</ref>
* <code>fgetln()</code>{{snd}} defined in <code>stdio.h</code>. This can be used to read a file line by line.<ref>{{cite web |url=http://man.freebsd.org/fgetln |title=fgetln |website=Man.freebsd.org |date=19 April 1994 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/stdio/fgetln.c#fgetln |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/stdio/fgetln.c |website=bxr.su}}</ref><ref>{{cite web |url=http://bxr.su/o/include/stdio.h |title=Super User's BSD Cross Reference: /OpenBSD/include/stdio.h |website=bxr.su}}</ref>
* <code>fts.h</code>{{snd}} contains some functions to traverse a file hierarchy<ref>{{cite web |url=http://man.freebsd.org/fts |title=fts|website=Man.freebsd.org |date=18 March 2012 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/include/fts.h |title=Super User's BSD Cross Reference: /OpenBSD/include/fts.h |website=bxr.su}}</ref>
* <code>db.h</code>{{snd}} some functions to connect to the [[Berkeley DB]]<ref>{{cite web |url=http://man.freebsd.org/db |title=db |website=Man.freebsd.org |date=10 September 2010 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/include/db.h |title=Super User's BSD Cross Reference: /OpenBSD/include/db.h |website=bxr.su}}</ref>
* <code>strlcat()</code> and <code>strlcpy()</code>{{snd}} secure alternatives for <code>strncat()</code> and <code>strncpy()</code><ref>Miller, Todd C. and Theo de Raadt. [http://www.usenix.org/events/usenix99/millert.html strlcpy and strlcat - consistent, safe, string copy and concatenation]. Proceedings of the 1999 USENIX Annual Technical Conference, June 6–11, 1999, pp. 175–178.</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/string/strlcat.c |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/string/strlcat.c |website=bxr.su}}</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/string/strlcpy.c |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/string/strlcpy.c |website=bxr.su}}</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/string/strncat.c |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/string/strncat.c |website=bxr.su}}</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/string/strncpy.c |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/string/strncpy.c |website=bxr.su}}</ref>
* <code>err.h</code>{{snd}} contains some functions to print formatted error messages<ref>{{cite web |url=http://man.freebsd.org/err |title=err|website=Man.freebsd.org |date=29 March 2012 |access-date=25 August 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/include/err.h |title=Super User's BSD Cross Reference: /OpenBSD/include/err.h |website=bxr.su}}</ref>
* <code>vis.h</code>{{snd}} contains the <code>vis()</code> function. This function is used to display non-printable characters in a visual format.<ref>{{cite web |title=vis(3) |url=http://www.freebsd.org/cgi/man.cgi?query=vis&sektion=3&apropos=0&manpath=FreeBSD+9.1-RELEASE |website=Man.FreeBSD.org |access-date=14 September 2013}}</ref><ref>{{cite web |url=http://bxr.su/o/lib/libc/gen/vis.c#vis |title=Super User's BSD Cross Reference: /OpenBSD/lib/libc/gen/vis.c |website=bxr.su}}</ref><ref>{{cite web |url=http://bxr.su/o/include/vis.h |title=Super User's BSD Cross Reference: /OpenBSD/include/vis.h |website=bxr.su}}</ref>