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Add strndup(3).

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This commit is contained in:
Jonas 'Sortie' Termansen 2012-11-08 18:50:53 +01:00
parent fd088903dd
commit e80f765fbf
3 changed files with 41 additions and 1 deletions
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1
libc/Makefile
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@ -111,6 +111,7 @@ strncasecmp.o \
strncat.o \
strncmp.o \
strncpy.o \
strndup.o \
strnlen.o \
strpbrk.o \
strrchr.o \

2
libc/include/string.h
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@ -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);

39
libc/strndup.cpp Normal file
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@ -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;
}