Add strsep(3).

libc/Makefile

@@ -221,6 +221,7 @@ string/strndup.o \
 string/strnlen.o \
 string/strpbrk.o \
 string/strrchr.o \
+string/strsep.o \
 string/strsignal.o \
 string/strspn.o \
 string/strstr.o \

libc/include/string.h

@@ -132,6 +132,7 @@ char* strchrnul(const char* str, int c);
 size_t strlcat(char* __restrict, const char* __restrict, size_t);
 size_t strlcpy(char* __restrict, const char* __restrict, size_t);
 /* TODO: strncasecmp_l */
+char* strsep(char**, const char*);
 int strverscmp(const char*, const char*);
 int timingsafe_memcmp(const void*, const void*, size_t);
 #endif

libc/string/strsep.cpp

@@ -0,0 +1,43 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    string/strsep.cpp
+    Extract a token from a string.
+
+*******************************************************************************/
+
+#include <string.h>
+
+extern "C" char* strsep(char** string_ptr, const char* delim)
+{
+	char* token = *string_ptr;
+	if ( !token )
+		return NULL;
+	size_t token_length = strcspn(token, delim);
+	if ( token[token_length] )
+	{
+		token[token_length++] = '\0';
+		*string_ptr = token + token_length;
+	}
+	else
+	{
+		*string_ptr = (char*) NULL;
+	}
+	return token;
+}