Add strndup(3).

libc/Makefile

@@ -111,6 +111,7 @@ strncasecmp.o \
 strncat.o \
 strncmp.o \
 strncpy.o \
+strndup.o \
 strnlen.o \
 strpbrk.o \
 strrchr.o \

libc/include/string.h

@@ -52,6 +52,7 @@ size_t strlen(const char*);
 char* strncat(char* restrict, const char* restrict, size_t);
 int strncmp(const char*, const char*, size_t);
 char* strncpy(char* restrict, const char* restrict, size_t);
+char* strndup(const char*, size_t);
 size_t strnlen(const char*, size_t);
 char* strpbrk(const char*, const char*);
 char* strrchr(const char*, int);
@@ -66,7 +67,6 @@ void* memccpy(void* restrict, const void* restrict, int, size_t);
 int strcoll_l(const char*, const char*, locale_t);
 char* strerror_l(int, locale_t);
 int strerror_r(int, char*, size_t);
-char* strndup(const char*, size_t);
 char* strsignal(int);
 size_t strxfrm(char* restrict, const char* restrict, size_t);
 size_t strxfrm_l(char* restrict, const char* restrict, size_t, locale_t);

libc/strndup.cpp

@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+
+	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/>.
+
+	strndup.cpp
+	Creates a copy of a string.
+
+*******************************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+
+extern "C" char* strndup(const char* input, size_t n)
+{
+	size_t inputsize = strlen(input);
+	if ( n < inputsize )
+		inputsize = n;
+	char* result = (char*) malloc(inputsize + 1);
+	if ( !result )
+		return NULL;
+	memcpy(result, input, inputsize);
+	result[inputsize] = 0;
+	return result;
+}