From: "René Scharfe" <rene.scharfe@lsrfire.ath.cx>
To: Junio C Hamano <gitster@pobox.com>
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
Andreas Ericsson <ae@op5.se>,
Git Mailing List <git@vger.kernel.org>,
Michael Gernoth <simigern@cip.informatik.uni-erlangen.de>,
Thomas Glanzmann <thomas@glanzmann.de>
Subject: [PATCH 3.5/3] add memmem()
Date: Fri, 07 Sep 2007 00:32:54 +0200 [thread overview]
Message-ID: <46E08016.9030604@lsrfire.ath.cx> (raw)
In-Reply-To: <46E028B9.2090908@lsrfire.ath.cx>
memmem() is a nice GNU extension for searching a length limited string
in another one.
This compat version is based on the version found in glibc 2.2 (GPL 2);
I only removed the optimization of checking the first char by hand, and
generally tried to keep the code simple. We can add it back if memcmp
shows up high in a profile, but for now I prefer to keep it (almost
trivially) simple.
Since I don't really know which platforms beside those with a glibc
have their own memmem(), I used a heuristic: if NO_STRCASESTR is set,
then NO_MEMMEM is set, too.
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
---
Makefile | 11 +++++++++++
compat/memmem.c | 29 +++++++++++++++++++++++++++++
git-compat-util.h | 6 ++++++
3 files changed, 46 insertions(+), 0 deletions(-)
create mode 100644 compat/memmem.c
diff --git a/Makefile b/Makefile
index 51af531..bae073f 100644
--- a/Makefile
+++ b/Makefile
@@ -28,6 +28,8 @@ all::
#
# Define NO_STRCASESTR if you don't have strcasestr.
#
+# Define NO_MEMMEM if you don't have memmem.
+#
# Define NO_STRLCPY if you don't have strlcpy.
#
# Define NO_STRTOUMAX if you don't have strtoumax in the C library.
@@ -402,6 +404,7 @@ ifeq ($(uname_S),SunOS)
NEEDS_NSL = YesPlease
SHELL_PATH = /bin/bash
NO_STRCASESTR = YesPlease
+ NO_MEMMEM = YesPlease
NO_HSTRERROR = YesPlease
ifeq ($(uname_R),5.8)
NEEDS_LIBICONV = YesPlease
@@ -424,6 +427,7 @@ ifeq ($(uname_O),Cygwin)
NO_D_TYPE_IN_DIRENT = YesPlease
NO_D_INO_IN_DIRENT = YesPlease
NO_STRCASESTR = YesPlease
+ NO_MEMMEM = YesPlease
NO_SYMLINK_HEAD = YesPlease
NEEDS_LIBICONV = YesPlease
NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
@@ -442,6 +446,7 @@ ifeq ($(uname_S),FreeBSD)
endif
ifeq ($(uname_S),OpenBSD)
NO_STRCASESTR = YesPlease
+ NO_MEMMEM = YesPlease
NEEDS_LIBICONV = YesPlease
BASIC_CFLAGS += -I/usr/local/include
BASIC_LDFLAGS += -L/usr/local/lib
@@ -456,6 +461,7 @@ ifeq ($(uname_S),NetBSD)
endif
ifeq ($(uname_S),AIX)
NO_STRCASESTR=YesPlease
+ NO_MEMMEM = YesPlease
NO_STRLCPY = YesPlease
NEEDS_LIBICONV=YesPlease
endif
@@ -467,6 +473,7 @@ ifeq ($(uname_S),IRIX64)
NO_IPV6=YesPlease
NO_SETENV=YesPlease
NO_STRCASESTR=YesPlease
+ NO_MEMMEM = YesPlease
NO_STRLCPY = YesPlease
NO_SOCKADDR_STORAGE=YesPlease
SHELL_PATH=/usr/gnu/bin/bash
@@ -661,6 +668,10 @@ ifdef NO_HSTRERROR
COMPAT_CFLAGS += -DNO_HSTRERROR
COMPAT_OBJS += compat/hstrerror.o
endif
+ifdef NO_MEMMEM
+ COMPAT_CFLAGS += -DNO_MEMMEM
+ COMPAT_OBJS += compat/memmem.o
+endif
ifeq ($(TCLTK_PATH),)
NO_TCLTK=NoThanks
diff --git a/compat/memmem.c b/compat/memmem.c
new file mode 100644
index 0000000..cd0d877
--- /dev/null
+++ b/compat/memmem.c
@@ -0,0 +1,29 @@
+#include "../git-compat-util.h"
+
+void *gitmemmem(const void *haystack, size_t haystack_len,
+ const void *needle, size_t needle_len)
+{
+ const char *begin = haystack;
+ const char *last_possible = begin + haystack_len - needle_len;
+
+ /*
+ * The first occurrence of the empty string is deemed to occur at
+ * the beginning of the string.
+ */
+ if (needle_len == 0)
+ return (void *)begin;
+
+ /*
+ * Sanity check, otherwise the loop might search through the whole
+ * memory.
+ */
+ if (haystack_len < needle_len)
+ return NULL;
+
+ for (; begin <= last_possible; begin++) {
+ if (!memcmp(begin, needle, needle_len))
+ return (void *)begin;
+ }
+
+ return NULL;
+}
diff --git a/git-compat-util.h b/git-compat-util.h
index ca0a597..1bfbdeb 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -172,6 +172,12 @@ extern uintmax_t gitstrtoumax(const char *, char **, int);
extern const char *githstrerror(int herror);
#endif
+#ifdef NO_MEMMEM
+#define memmem gitmemmem
+void *gitmemmem(const void *haystack, size_t haystacklen,
+ const void *needle, size_t needlelen);
+#endif
+
extern void release_pack_memory(size_t, int);
static inline char* xstrdup(const char *str)
--
1.5.3
next prev parent reply other threads:[~2007-09-06 22:34 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-03 18:07 [PATCH 2/3] archive: specfile support (--pretty=format: in archive files) René Scharfe
2007-09-03 18:40 ` Johannes Schindelin
2007-09-03 20:19 ` David Kastrup
2007-09-04 23:13 ` René Scharfe
2007-09-03 23:53 ` Junio C Hamano
2007-09-04 5:45 ` Andreas Ericsson
2007-09-04 10:41 ` Johannes Schindelin
2007-09-04 23:13 ` René Scharfe
2007-09-05 0:12 ` Johannes Schindelin
2007-09-05 0:23 ` Junio C Hamano
2007-09-06 16:20 ` [PATCH 4/3] archive: specfile syntax change: "$Format:%PLCHLDR$" instead of just "%PLCHLDR" René Scharfe
2007-09-06 17:11 ` Johannes Schindelin
2007-09-06 20:35 ` René Scharfe
2007-09-06 20:53 ` René Scharfe
2007-09-06 23:17 ` Junio C Hamano
2007-09-07 10:44 ` Johannes Schindelin
2007-09-06 22:32 ` René Scharfe [this message]
2007-09-06 22:34 ` [PATCH 4/3] archive: specfile syntax change: "$Format:%PLCHLDR$" instead of just "%PLCHLDR" (take 2) René Scharfe
2007-09-06 16:51 ` [PATCH 5/3] archive: rename attribute specfile to export-subst René Scharfe
2007-09-06 17:13 ` Johannes Schindelin
2007-09-06 20:38 ` René Scharfe
2007-09-06 21:03 ` Junio C Hamano
2007-09-07 10:45 ` Johannes Schindelin
2007-09-04 23:13 ` [PATCH 2/3] archive: specfile support (--pretty=format: in archive files) René Scharfe
2007-09-05 0:19 ` Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=46E08016.9030604@lsrfire.ath.cx \
--to=rene.scharfe@lsrfire.ath.cx \
--cc=Johannes.Schindelin@gmx.de \
--cc=ae@op5.se \
--cc=git@vger.kernel.org \
--cc=gitster@pobox.com \
--cc=simigern@cip.informatik.uni-erlangen.de \
--cc=thomas@glanzmann.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).