From d83903d9e26ec17604ebfb66f09adc9dd93fd02d Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Mon, 31 Aug 2015 19:40:20 +0200 Subject: add memory copying functions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/string/strdup.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 src/string/strdup.c (limited to 'src/string/strdup.c') diff --git a/src/string/strdup.c b/src/string/strdup.c new file mode 100644 index 0000000..27783b9 --- /dev/null +++ b/src/string/strdup.c @@ -0,0 +1,79 @@ +/** + * slibc — Yet another C library + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#include +#include + + + +/** + * Duplicate a string. + * + * @param string The string to duplicate. + * @return The new string. `NULL` is returned on error + * and `errno` is set to indicate the error. + * + * @throws ENOMEM The process could not allocate sufficient amount of memory. + */ +char* strdup(const char* string) +{ + size_t n = strlen(string) + 1; + char* r = malloc(n * sizeof(char)); + return r == NULL ? NULL : memcpy(r, string, n); +} + + +/** + * Duplicate a string. + * + * This is a GNU extension. + * + * @param string The string to duplicate. + * @param maxlen Truncate the string to this length, if it is longer. + * A NUL byte is guaranteed to always be written + * upon successful completion. + * @return The new string. `NULL` is returned on error + * and `errno` is set to indicate the error. + * + * @throws ENOMEM The process could not allocate sufficient amount of memory. + */ +char* strndup(const char* string, size_t maxlen) +{ + size_t n = strnlen(string, maxlen) + 1; + char* r = malloc(n * sizeof(char)); + return r == NULL ? NULL : memcpy(r, string, n); +} + + +/** + * Duplicate a memory segment. + * + * This is a slibc extension. + * + * @param segment The memory segment to duplicate. + * @param size The size of the memory segment. + * @return The new segment. `NULL` is returned on error + * and `errno` is set to indicate the error. + * + * @throws ENOMEM The process could not allocate sufficient amount of memory. + */ +void* memdup(const void* segment, size_t size) +{ + wchar_t* r = malloc(size * sizeof(wchar_t)); + return r == NULL ? NULL : memcpy(r, segment, size); +} + -- cgit v1.2.3-70-g09d2