[PATCH] Add compat version of strcasestr

[Tomas Carnecky]

strcasestr is not part of any standard (unlike for example strcasecmp) and thus
not available on all platforms (in my case Solaris).

---
 compat/Makefile.local    |    4 ++++
 compat/compat.h          |    4 ++++
 compat/have_strcasestr.c |    8 ++++++++
 compat/strcasestr.c      |   15 +++++++++++++++
 configure                |   19 +++++++++++++++++--
 5 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 compat/have_strcasestr.c
 create mode 100644 compat/strcasestr.c

diff --git a/compat/Makefile.local b/compat/Makefile.local
index 81e6c70..328eca2 100644
--- a/compat/Makefile.local
+++ b/compat/Makefile.local
@@ -8,3 +8,7 @@ notmuch_compat_srcs =
 ifneq ($(HAVE_GETLINE),1)
 notmuch_compat_srcs += $(dir)/getline.c $(dir)/getdelim.c
 endif
+
+ifneq ($(HAVE_STRCASESTR),1)
+notmuch_compat_srcs += $(dir)/strcasestr.c
+endif
diff --git a/compat/compat.h b/compat/compat.h
index d639e0f..be70bd8 100644
--- a/compat/compat.h
+++ b/compat/compat.h
@@ -38,4 +38,8 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp);
 
 #endif /* !HAVE_GETLINE */
 
+#if !HAVE_STRCASESTR
+char *strcasestr(char *a, char *b);
+#endif /* !HAVE_STRCASESTR */
+
 #endif /* NOTMUCH_COMPAT_H */
diff --git a/compat/have_strcasestr.c b/compat/have_strcasestr.c
new file mode 100644
index 0000000..36e760d
--- /dev/null
+++ b/compat/have_strcasestr.c
@@ -0,0 +1,8 @@
+
+#include <string.h>
+#include <strings.h>
+
+int main()
+{
+	return strcasestr("","");
+}
diff --git a/compat/strcasestr.c b/compat/strcasestr.c
new file mode 100644
index 0000000..a4188b9
--- /dev/null
+++ b/compat/strcasestr.c
@@ -0,0 +1,15 @@
+
+#include <string.h>
+#include <strings.h>
+
+char *strcasestr(char *a, char *b)
+{
+  size_t l;
+  char f[3];
+  
+  snprintf(f, sizeof(f), "%c%c", tolower(*b), toupper(*b));
+  for (l = strcspn(a, f); l != strlen(a); l += strcspn(a + l + 1, f) + 1)
+    if (strncasecmp(a + l, b, strlen(b)) == 0)
+      return a + l;
+  return NULL;
+}	
diff --git a/configure b/configure
index 5af7852..add2da6 100755
--- a/configure
+++ b/configure
@@ -310,6 +310,17 @@ else
 fi
 rm -f compat/have_getline
 
+printf "Checking for strcasestr... "
+if ${CC} -o compat/have_strcasestr compat/have_strcasestr.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+    have_strcasestr=1
+else
+    printf "No (will use our own instead).\n"
+    have_strcasestr=0
+fi
+rm -f compat/have_strcasestr
+
 cat <<EOF
 
 All required packages were found. You may now run the following
@@ -384,6 +395,10 @@ zsh_completion_dir = \$(prefix)/share/zsh/functions/Completion/Unix
 # build its own version)
 HAVE_GETLINE = ${have_getline}
 
+# Whether the strcasestr function is available (if not, then notmuch will
+# build its own version) 
+HAVE_STRCASESTR = ${have_strcasestr} 
+
 # Flags needed to compile and link against Xapian
 XAPIAN_CXXFLAGS = ${xapian_cxxflags}
 XAPIAN_LDFLAGS = ${xapian_ldflags}
@@ -405,9 +420,9 @@ VALGRIND_CFLAGS = ${valgrind_cflags}
 # Combined flags for compiling and linking against all of the above
 CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)      \\
 		   \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND)   \\
-		   \$(VALGRIND_CFLAGS)
+		   \$(VALGRIND_CFLAGS) -DHAVE_STRCASESTR=\$(HAVE_STRCASESTR)
 CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)    \\
 		     \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND) \\
-		     \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS)
+		     \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS) -DHAVE_STRCASESTR=\$(HAVE_STRCASESTR)
 CONFIGURE_LDFLAGS =  \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(XAPIAN_LDFLAGS)
 EOF
-- 
1.7.0.2