2004-11-03 13:51:07 +00:00
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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 17:56:43 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Added history, aeb, 980113.
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2005-04-05 14:01:07 +00:00
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.\" 2005-05-05 mtk: added strcasestr()
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2004-11-03 13:51:07 +00:00
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.\"
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gets.3, mbtowc.3, printf.3, puts.3, scanf.3, stpcpy.3, stpncpy.3, strcat.3, strlen.3, strnlen.3, strsep.3, strstr.3, strxfrm.3, utmp.5: Global fix: consistent use of "null byte"
Bring more consistency to the discussion of
"[terminating] null byte"
by writing (at least in the initial use in a page)
"[terminating] null byte ('\0')".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-28 04:16:17 +00:00
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.TH STRSTR 3 2011-09-28 "GNU" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2007-06-14 06:02:41 +00:00
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strstr, strcasestr \- locate a substring
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.SH SYNOPSIS
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.nf
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.B #include <string.h>
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.sp
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.BI "char *strstr(const char *" haystack ", const char *" needle );
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.sp
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getresuid.2, mremap.2, poll.2, remap_file_pages.2, setresuid.2, splice.2, sync_file_range.2, syscall.2, tee.2, vmsplice.2, INFINITY.3, aio_init.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, fopencookie.3, ftw.3, getaddrinfo_a.3, getloadavg.3, getutent.3, grantpt.3, hsearch.3, lseek64.3, memmem.3, mempcpy.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, sched_getcpu.3, sincos.3, strchr.3, strfry.3, strnlen.3, strptime.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlockpt.3, wcwidth.3: Add reference to feature_test_macros(7)
Some pages simply list feature test macro requirements in
the form:
#define #GNU_SOURCE
#include <someheader.h>
For these pages, add a "See feature_test_macros(7)" comment
on the "#define" line.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 04:31:47 +00:00
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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2005-04-05 14:01:07 +00:00
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.sp
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.B #include <string.h>
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.sp
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.BI "char *strcasestr(const char *" haystack ", const char *" needle );
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2004-11-03 13:51:07 +00:00
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.fi
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.SH DESCRIPTION
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2007-05-12 09:06:04 +00:00
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The
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.BR strstr ()
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function finds the first occurrence of the substring
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2007-04-24 16:44:51 +00:00
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\fIneedle\fP in the string \fIhaystack\fP.
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gets.3, mbtowc.3, printf.3, puts.3, scanf.3, stpcpy.3, stpncpy.3, strcat.3, strlen.3, strnlen.3, strsep.3, strstr.3, strxfrm.3, utmp.5: Global fix: consistent use of "null byte"
Bring more consistency to the discussion of
"[terminating] null byte"
by writing (at least in the initial use in a page)
"[terminating] null byte ('\0')".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-28 04:16:17 +00:00
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The terminating null bytes (\(aq\\0\(aq) are not compared.
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2005-04-05 14:01:07 +00:00
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2007-05-12 09:06:04 +00:00
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The
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.BR strcasestr ()
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function is like
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2007-11-24 10:10:39 +00:00
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.BR strstr (),
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but ignores the case of both arguments.
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.SH "RETURN VALUE"
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These functions return a pointer to the beginning of the
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substring, or NULL if the substring is not found.
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.SH "CONFORMING TO"
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2007-05-12 09:06:04 +00:00
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The
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.BR strstr ()
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function conforms to C89 and C99.
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The
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.BR strcasestr ()
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accept.2, execve.2, futimesat.2, getresuid.2, getrlimit.2, madvise.2, mq_getsetattr.2, msgctl.2, nice.2, open.2, poll.2, setresuid.2, shmctl.2, sigaction.2, times.2, utimensat.2, __setfpucw.3, atoi.3, endian.3, err.3, euidaccess.3, fenv.3, fopencookie.3, fpurge.3, getgrouplist.3, getutmp.3, j0.3, lgamma.3, netlink.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_cleanup_push_defer_np.3, pthread_getattr_np.3, pthread_kill_other_threads_np.3, pthread_setaffinity_np.3, pthread_tryjoin_np.3, pthread_yield.3, random_r.3, readdir.3, rtnetlink.3, scanf.3, setenv.3, significand.3, sigsetops.3, strerror.3, strstr.3, sysv_signal.3, termios.3, timegm.3, unlocked_stdio.3, y0.3, locale.5, bootparam.7, feature_test_macros.7, ip.7, locale.7, pthreads.7, rtld-audit.7, nscd.8: Global fix: s/non-standard/nonstandard/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:37:52 +00:00
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function is a nonstandard extension.
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2007-05-19 04:30:20 +00:00
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.SH BUGS
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Early versions of Linux libc (like 4.5.26) would not allow
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an empty \fIneedle\fP argument for
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.BR strstr ().
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Later versions (like 4.6.27) work correctly,
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and return \fIhaystack\fP when \fIneedle\fP is empty.
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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.BR index (3),
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.BR memchr (3),
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.BR rindex (3),
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2005-04-05 14:01:07 +00:00
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.BR strcasecmp (3),
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2008-07-14 15:52:21 +00:00
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.BR strchr (3),
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index.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strfry.3, strpbrk.3, strsep.3, strspn.3, strstr.3, strtok.3, strxfrm.3: SEE ALSO: Add reference to string(3)
The idea here is to provide a route to discover other
string functions.
Reported-by: Mark Hills <mark@pogo.org.uk>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-12 14:39:58 +00:00
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.BR string (3),
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2004-11-03 13:51:07 +00:00
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.BR strpbrk (3),
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.BR strsep (3),
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.BR strspn (3),
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2006-02-09 20:57:44 +00:00
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.BR strtok (3),
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getresuid.2, intro.2, mremap.2, open.2, poll.2, posix_fadvise.2, pread.2, remap_file_pages.2, setresuid.2, signal.2, splice.2, sync_file_range.2, tee.2, vmsplice.2, INFINITY.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, ffs.3, fmemopen.3, fopencookie.3, ftw.3, getdate.3, getline.3, getloadavg.3, getopt.3, getsubopt.3, getutent.3, grantpt.3, hsearch.3, intro.3, lseek64.3, memmem.3, mempcpy.3, mq_receive.3, mq_send.3, posix_fallocate.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, readdir.3, sigset.3, sincos.3, stpcpy.3, stpncpy.3, strchr.3, strfry.3, strnlen.3, strptime.3, strsignal.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlocked_stdio.3, unlockpt.3, wcpcpy.3, wcpncpy.3, wcsdup.3, wcwidth.3: SEE ALSO: Remove redundant reference to feature_test_macros(7)
Reported-by: Florian Lehmann <flo.lehmann@googlemail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 05:05:22 +00:00
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.BR wcsstr (3)
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