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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Mon Mar 29 22:41:16 1993, David Metcalfe
.\" Modified Sat Jul 24 21:35:16 1993, Rik Faith (faith@cs.unc.edu)
.\"
.\" Japanese Version Copyright (c) 1998 NAKANO Takeo all rights reserved.
.\" Translated 1998-03-18, NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated 2005-02-26, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH BSEARCH 3 2003-11-01 "" "Linux Programmer's Manual"
.SH ̾
bsearch \- Ȥ줿ʬڸ (binary search)
.SH
.nf
.B #include <stdlib.h>
.sp
.BI "void *bsearch(const void *" key ", const void *" base ,
.BI " size_t " nmemb ", size_t " size ,
.BI " int (*" compar ")(const void *, const void *));"
.fi
.SH
.BR bsearch ()
ؿ \fInmemb\fP ĤΥ֥Ȥʤ
롣κǽΥСؤΥݥ \fIbase\fP ˤäͿ롣
ݥ \fIkey\fP ǻȤ륪֥ȤȰפС֤롣
γơΥСΥ \fIsize\fP ˤäƻꤹ롣
.PP
ƤӴؿ \fIcompar\fP ˴Ť˥ȤƤʤ
Фʤʤ \fIcompar\fP 롼Ĥΰؿǡ
ܤ \fIkey\fP ؤΥݥΥСؤΥݥ롣
ν˻ꤷȤ \fIkey\fP С꾮Ȥˤ
礭ȤˤפȤˤ 0 줾
\fIcompar\fP ֤ʤФʤʤ
.SH ֤
.BR bsearch ()
ؿϡΥСΤפΤؤΥݥ
֤ĤʤäȤ NULL ֤ \fIkey\fP ȰפС
ʣȤΤΤɤΥС֤뤫Ϥ狼ʤ
.SH
SVr4, 4.3BSD, POSIX.1-2001, C89, C99.
.SH
ʲϡ
.BR qsort (3)
Ȥäƹ¤Τ¤ӴԤä塢
˾Ǥ
.BR bsearch ()
ȤäƼΤǤ롣
.sp
.nf
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct mi {
int nr;
char *name;
} months[] = {
{ 1, "jan" }, { 2, "feb" }, { 3, "mar" }, { 4, "apr" },
{ 5, "may" }, { 6, "jun" }, { 7, "jul" }, { 8, "aug" },
{ 9, "sep" }, {10, "oct" }, {11, "nov" }, {12, "dec" }
};
#define nr_of_months (sizeof(months)/sizeof(months[0]))
static int
compmi(const void *m1, const void *m2)
{
struct mi *mi1 = (struct mi *) m1;
struct mi *mi2 = (struct mi *) m2;
return strcmp(mi1\->name, mi2\->name);
}
int
main(int argc, char **argv)
{
int i;
qsort(months, nr_of_months, sizeof(struct mi), compmi);
for (i = 1; i < argc; i++) {
struct mi key, *res;
key.name = argv[i];
res = bsearch(&key, months, nr_of_months,
sizeof(struct mi), compmi);
if (res == NULL)
printf("\(aq%s\(aq: unknown month\en", argv[i]);
else
printf("%s: month #%d\en", res\->name, res\->nr);
}
exit(EXIT_SUCCESS);
}
.fi
.\" qsort.3 ǻȤƤ롣
.SH Ϣ
.BR hsearch (3),
.BR lsearch (3),
.BR qsort (3),
.BR tsearch (3)
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