--- bsearch.3.orig 2009-05-12 11:21:33.000000000 -0700 +++ bsearch.3 2009-05-20 14:53:48.000000000 -0700 @@ -36,30 +36,37 @@ .\" @(#)bsearch.3 8.3 (Berkeley) 4/19/94 .\" $FreeBSD: src/lib/libc/stdlib/bsearch.3,v 1.8 2001/09/07 14:46:35 asmodai Exp $ .\" -.Dd April 19, 1994 +.Dd May 20, 2008 .Dt BSEARCH 3 .Os .Sh NAME +#ifdef UNIFDEF_BLOCKS +.Nm bsearch , +.Nm bsearch_b +#else .Nm bsearch +#endif .Nd binary search of a sorted table -.Sh LIBRARY -.Lb libc .Sh SYNOPSIS .In stdlib.h .Ft void * -.Fn bsearch "const void *key" "const void *base" "size_t nmemb" "size_t size" "int (*compar) (const void *, const void *)" +.Fn bsearch "const void *key" "const void *base" "size_t nel" "size_t width" "int (*compar) (const void *, const void *)" +#ifdef UNIFDEF_BLOCKS +.Ft void * +.Fn bsearch_b "const void *key" "const void *base" "size_t nel" "size_t width" "int (^compar) (const void *, const void *)" +#endif .Sh DESCRIPTION The .Fn bsearch function searches an array of -.Fa nmemb +.Fa nel objects, the initial member of which is pointed to by .Fa base , for a member that matches the object pointed to by .Fa key . -The size of each member of the array is specified by -.Fa size . +The size (in bytes) of each member of the array is specified by +.Fa width . .Pp The contents of the array should be in ascending sorted order according to the comparison function referenced by @@ -70,15 +77,33 @@ is expected to have two arguments which point to the .Fa key -object and to an array member, in that order, and should return an integer +object and to an array member, in that order. +It should return an integer which is less than, equal to, or greater than zero if the .Fa key object is found, respectively, to be less than, to match, or be greater than the array member. +#ifdef UNIFDEF_BLOCKS +.Pp +The +.Fn bsearch_b +function is like +.Fn bsearch +except the callback +.Fa compar +is a block pointer instead of a function pointer. +#endif .Sh RETURN VALUES The .Fn bsearch -function returns a pointer to a matching member of the array, or a null +#ifdef UNIFDEF_BLOCKS +and +.Fn bsearch_b +functions +#else +function +#endif +returns a pointer to a matching member of the array, or a null pointer if no match is found. If two members compare as equal, which member is matched is unspecified. .Sh SEE ALSO