mirror of https://gitee.com/openkylin/wget.git
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* xmemdup0.c -- copy a block of arbitrary bytes, plus a trailing NUL
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Copyright (C) 2008-2019 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "xmemdup0.h"
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#include "xalloc.h"
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#include <string.h>
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/* Clone an arbitrary block of bytes P of size S, with error checking,
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and include a terminating NUL byte. P is of type 'void const *',
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to make it easier to use this with other mem* functions that return
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'void *', but since appending a NUL byte only makes sense on bytes,
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the return type is 'char *'.
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The terminating NUL makes it safe to use strlen or rawmemchr to
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check for embedded NUL; it also speeds up algorithms such as escape
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sequence processing on arbitrary memory, by making it always safe
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to read the byte after the escape character rather than having to
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check if each escape character is the last byte in the object. */
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char *
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xmemdup0 (void const *p, size_t s)
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{
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char *result = xcharalloc (s + 1);
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if (s > 0)
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memcpy (result, p, s);
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result[s] = 0;
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return result;
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}
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