From 3e39c526d28582b0b5606d3e3bb36ee3d271e616 Mon Sep 17 00:00:00 2001
From: Hiltjo Posthuma
Date: Tue, 8 Feb 2022 19:32:25 +0100
Subject: revert using strcasestr and use a more optimized portable version

... compared to the old cistrstr().

Thanks for the feedback!
---
 config.mk |  2 +-
 dmenu.c   | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/config.mk b/config.mk
index bea4e4b..05d5a3e 100644
--- a/config.mk
+++ b/config.mk
@@ -23,7 +23,7 @@ INCS = -I$(X11INC) -I$(FREETYPEINC)
 LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS)
 
 # flags
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_GNU_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
 CFLAGS   = -std=c99 -pedantic -Wall -Os $(INCS) $(CPPFLAGS)
 LDFLAGS  = $(LIBS)
 
diff --git a/dmenu.c b/dmenu.c
index d06bea1..88d2f12 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -102,6 +102,25 @@ cleanup(void)
 	XCloseDisplay(dpy);
 }
 
+static char *
+cistrstr(const char *h, const char *n)
+
+{
+	size_t i;
+
+	if (!n[0])
+		return (char *)h;
+
+	for (; *h; ++h) {
+		for (i = 0; n[i] && tolower((unsigned char)n[i]) ==
+		            tolower((unsigned char)h[i]); ++i)
+			;
+		if (n[i] == '\0')
+			return (char *)h;
+	}
+	return NULL;
+}
+
 static int
 drawitem(struct item *item, int x, int y, int w)
 {
@@ -711,7 +730,7 @@ main(int argc, char *argv[])
 			fast = 1;
 		else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
 			fstrncmp = strncasecmp;
-			fstrstr = strcasestr;
+			fstrstr = cistrstr;
 		} else if (i + 1 == argc)
 			usage();
 		/* these options take one argument */
-- 
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