/* Quote a blob so that it can be used in C literals. Copyright (C) 2018-2019 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 <http://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 unsigned char *p = blob; for (size_t i = 0; i < length; ++i) { unsigned char ch = p[i]; /* Use C backslash escapes for those control characters for which they are defined. */ switch (ch) { case '\a': putc_unlocked ('\\', out.out); putc_unlocked ('a', out.out); break; case '\b': putc_unlocked ('\\', out.out); putc_unlocked ('b', out.out); break; case '\f': putc_unlocked ('\\', out.out); putc_unlocked ('f', out.out); break; case '\n': putc_unlocked ('\\', out.out); putc_unlocked ('n', out.out); break; case '\r': putc_unlocked ('\\', out.out); putc_unlocked ('r', out.out); break; case '\t': putc_unlocked ('\\', out.out); putc_unlocked ('t', out.out); break; case '\v': putc_unlocked ('\\', out.out); putc_unlocked ('v', out.out); break; case '\\': case '\'': case '\"': putc_unlocked ('\\', out.out); putc_unlocked (ch, out.out); break; default: if (ch < ' ' || ch > '~') /* Use octal sequences because they are fixed width, unlike hexadecimal sequences. */ fprintf (out.out, "\\%03o", ch); else putc_unlocked (ch, out.out); } } xfclose_memstream (&out); return out.buffer; }