1 /* xmemdup0.c -- copy a block of arbitrary bytes, plus a trailing NUL 2 3 Copyright (C) 2008-2012 Free Software Foundation, Inc. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <config.h> 19 20 #include "xmemdup0.h" 21 #include "xalloc.h" 22 23 #include <string.h> 24 25 /* Clone an arbitrary block of bytes P of size S, with error checking, 26 and include a terminating NUL byte. P is of type 'void const *', 27 to make it easier to use this with other mem* functions that return 28 'void *', but since appending a NUL byte only makes sense on bytes, 29 the return type is 'char *'. 30 31 The terminating NUL makes it safe to use strlen or rawmemchr to 32 check for embedded NUL; it also speeds up algorithms such as escape 33 sequence processing on arbitrary memory, by making it always safe 34 to read the byte after the escape character rather than having to 35 check if each escape character is the last byte in the object. */ 36 37 char * 38 xmemdup0 (void const *p, size_t s) 39 { 40 char *result = xcharalloc (s + 1); 41 memcpy (result, p, s); 42 result[s] = 0; 43 return result; 44 } 45
