- add strrchr

include/libbb.h

@@ -244,6 +244,7 @@ extern void chomp(char *s);
 extern void trim(char *s);
 extern char *skip_whitespace(const char *);
 extern char *skip_non_whitespace(const char *);
+extern char *strrstr(const char *haystack, const char *needle);
 
 //TODO: supply a pointer to char[11] buffer (avoid statics)?
 extern const char *bb_mode_string(mode_t mode);

libbb/Kbuild

@@ -87,6 +87,7 @@ lib-y += simplify_path.o
 lib-y += skip_whitespace.o
 lib-y += speed_table.o
 lib-y += str_tolower.o
+lib-y += strrstr.o
 lib-y += time.o
 lib-y += trim.o
 lib-y += u_signal_names.o

libbb/strrstr.c

@@ -0,0 +1,20 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2008 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* reverse strstr() */
+char* strrstr(const char *haystack, const char *needle)
+{
+	char *tmp = strrchr(haystack, *needle);
+	if (tmp == NULL || strcmp(tmp, needle) != 0)
+		return NULL;
+	return tmp;
+}
+