[PATCH] Add simplistic compat implementation for strcasestr
Dirk Hohndel
hohndel at x200.gr8dns.org
Tue Apr 13 09:17:37 PDT 2010
v.2 of the patch, this time including the Makefile logic.
All platforms I have access to support strcasestr - so please test
that the implementation / integration works correctly on those
plattforms.
Signed-off-by: Dirk Hohndel <hohndel at infradead.org>
---
compat/have_strcasestr.c | 10 ++++++++++
compat/strcasestr.c | 41 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+), 0 deletions(-)
create mode 100644 compat/have_strcasestr.c
create mode 100644 compat/strcasestr.c
diff --git a/compat/have_strcasestr.c b/compat/have_strcasestr.c
new file mode 100644
index 0000000..c0fb762
--- /dev/null
+++ b/compat/have_strcasestr.c
@@ -0,0 +1,10 @@
+#define _GNU_SOURCE
+#include <strings.h>
+
+int main()
+{
+ char *found;
+ const char *haystack, *needle;
+
+ found = strcasestr(haystack, needle);
+}
diff --git a/compat/strcasestr.c b/compat/strcasestr.c
new file mode 100644
index 0000000..50bc89d
--- /dev/null
+++ b/compat/strcasestr.c
@@ -0,0 +1,41 @@
+/*
+ * slow simplistic reimplementation of strcasestr for systems that
+ * don't include it in their library
+ *
+ * based on a GPL implementation in OpenTTD found under GPL v2
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation, version 2.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
+
+/* Imported into notmuch by Dirk Hohndel - original author unknown. */
+/* the semantic here actually puzzles me:
+ how can haystack be const char * - yet the return value is char *
+ after all, it points to a sub-string of haystack... */
+
+#include <string.h>
+
+char *strcasestr(const char *haystack, const char *needle)
+{
+ size_t hay_len = strlen(haystack);
+ size_t needle_len = strlen(needle);
+ while (hay_len >= needle_len) {
+ if (strncasecmp(haystack, needle, needle_len) == 0)
+ return (char *) haystack;
+
+ haystack++;
+ hay_len--;
+ }
+
+ return NULL;
+}
--
1.6.6.1
--
Dirk Hohndel
Intel Open Source Technology Center
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