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84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/* Quote a blob so that it can be used in C literals.
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Copyright (C) 2018-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/support.h>
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#include <support/xmemstream.h>
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char *
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support_quote_blob (const void *blob, size_t length)
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{
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struct xmemstream out;
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xopen_memstream (&out);
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const unsigned char *p = blob;
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for (size_t i = 0; i < length; ++i)
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{
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unsigned char ch = p[i];
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/* Use C backslash escapes for those control characters for
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which they are defined. */
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switch (ch)
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{
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case '\a':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('a', out.out);
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break;
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case '\b':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('b', out.out);
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break;
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case '\f':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('f', out.out);
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break;
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case '\n':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('n', out.out);
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break;
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case '\r':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('r', out.out);
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break;
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case '\t':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('t', out.out);
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break;
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case '\v':
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putc_unlocked ('\\', out.out);
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putc_unlocked ('v', out.out);
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break;
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case '\\':
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case '\'':
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case '\"':
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putc_unlocked ('\\', out.out);
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putc_unlocked (ch, out.out);
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break;
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default:
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if (ch < ' ' || ch > '~')
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/* Use octal sequences because they are fixed width,
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unlike hexadecimal sequences. */
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fprintf (out.out, "\\%03o", ch);
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else
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putc_unlocked (ch, out.out);
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}
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}
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xfclose_memstream (&out);
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return out.buffer;
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}
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