Date: Mon, 19 Mar 2018 07:07:03 +0000 (UTC) From: Eitan Adler <eadler@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r331192 - stable/11/lib/libc/stdlib Message-ID: <201803190707.w2J773sg006885@repo.freebsd.org>
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Author: eadler Date: Mon Mar 19 07:07:03 2018 New Revision: 331192 URL: https://svnweb.freebsd.org/changeset/base/331192 Log: MFC r320992,r320993: Add a complete example to tsearch(3) Modified: stable/11/lib/libc/stdlib/tsearch.3 Directory Properties: stable/11/ (props changed) Modified: stable/11/lib/libc/stdlib/tsearch.3 ============================================================================== --- stable/11/lib/libc/stdlib/tsearch.3 Mon Mar 19 07:03:02 2018 (r331191) +++ stable/11/lib/libc/stdlib/tsearch.3 Mon Mar 19 07:07:03 2018 (r331192) @@ -27,7 +27,7 @@ .\" OpenBSD: tsearch.3,v 1.2 1998/06/21 22:13:49 millert Exp .\" $FreeBSD$ .\" -.Dd October 9, 2016 +.Dd June 4, 2017 .Dt TSEARCH 3 .Os .Sh NAME @@ -130,6 +130,64 @@ is NULL or the datum cannot be found. The .Fn twalk function returns no value. +.Sh EXAMPLES +This example uses +.Fn tsearch +to search for four strings in +.Dv root . +Because the strings are not already present, they are added. +.Fn tsearch +is called twice on the fourth string to demonstrate that a string is not added when it is already present. +.Fn tfind +is used to find the single instance of the fourth string, and +.Fn tdelete +removes it. +Finally, +.Fn twalk +is used to return and display the resulting binary search tree. +.Bd -literal +#include <stdio.h> +#include <search.h> +#include <string.h> + +int +comp(const void *a, const void *b) +{ + + return strcmp(a, b); +} + +void +printwalk(const posix_tnode * node, VISIT v, int __unused0) +{ + + if (v == postorder || v == leaf) { + printf("node: %s\en", *(char **)node); + } +} + +int +main(void) +{ + posix_tnode *root = NULL; + + char one[] = "blah1"; + char two[] = "blah-2"; + char three[] = "blah-3"; + char four[] = "blah-4"; + + tsearch(one, &root, comp); + tsearch(two, &root, comp); + tsearch(three, &root, comp); + tsearch(four, &root, comp); + tsearch(four, &root, comp); + printf("four: %s\en", *(char **)tfind(four, &root, comp)); + tdelete(four, &root, comp); + + twalk(root, printwalk); + return 0; +} +.Ed .Sh SEE ALSO .Xr bsearch 3 , .Xr hsearch 3 ,
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