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/* Quote a blob so that it can be used in C literals.
Copyright (C) 2018-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU 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 2.1 of the License, or (at your option) any later version.
The GNU 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 GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/support.h>
#include <support/xmemstream.h>
char *
SUPPORT_QUOTE_BLOB (const void *blob, size_t length)
{
struct xmemstream out;
xopen_memstream (&out);
const CHAR *p = blob;
for (size_t i = 0; i < length; ++i)
{
CHAR ch = p[i];
/* Use C backslash escapes for those control characters for
which they are defined. */
switch (ch)
{
case L_('\a'):
putc_unlocked ('\\', out.out);
putc_unlocked ('a', out.out);
break;
case L_('\b'):
putc_unlocked ('\\', out.out);
putc_unlocked ('b', out.out);
break;
case L_('\f'):
putc_unlocked ('\\', out.out);
putc_unlocked ('f', out.out);
break;
case L_('\n'):
putc_unlocked ('\\', out.out);
putc_unlocked ('n', out.out);
break;
case L_('\r'):
putc_unlocked ('\\', out.out);
putc_unlocked ('r', out.out);
break;
case L_('\t'):
putc_unlocked ('\\', out.out);
putc_unlocked ('t', out.out);
break;
case L_('\v'):
putc_unlocked ('\\', out.out);
putc_unlocked ('v', out.out);
break;
case L_('\\'):
case L_('\''):
case L_('\"'):
putc_unlocked ('\\', out.out);
putc_unlocked (ch, out.out);
break;
default:
if (ch < L_(' ') || ch > L_('~'))
/* For narrow characters, use octal sequences because they
are fixed width, unlike hexadecimal sequences. For
wide characters, use N2785 delimited escape
sequences. */
if (WIDE)
fprintf (out.out, "\\x{%x}", (unsigned int) ch);
else
fprintf (out.out, "\\%03o", (unsigned int) ch);
else
putc_unlocked (ch, out.out);
}
}
xfclose_memstream (&out);
return out.buffer;
}
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