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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* percent.c - Percent escaping
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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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*
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* GnuPG 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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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <ctype.h>
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#include "util.h"
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/* Create a newly alloced string from STRING with all spaces and
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control characters converted to plus signs or %xx sequences. The
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function returns the new string or NULL in case of a malloc
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failure.
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Note that we also escape the quote character to work around a bug
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in the mingw32 runtime which does not correcty handle command line
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quoting. We correctly double the quote mark when calling a program
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(i.e. gpg-protect-tool), but the pre-main code does not notice the
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double quote as an escaped quote. We do this also on POSIX systems
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for consistency. */
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char *
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percent_plus_escape (const char *string)
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{
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char *buffer, *p;
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const char *s;
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size_t length;
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for (length=1, s=string; *s; s++)
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{
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if (*s == '+' || *s == '\"' || *s == '%'
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|| *(const unsigned char *)s < 0x20)
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length += 3;
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else
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length++;
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}
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buffer = p = xtrymalloc (length);
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if (!buffer)
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return NULL;
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for (s=string; *s; s++)
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{
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if (*s == '+' || *s == '\"' || *s == '%'
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|| *(const unsigned char *)s < 0x20)
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{
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snprintf (p, 4, "%%%02X", *(unsigned char *)s);
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p += 3;
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}
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else if (*s == ' ')
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*p++ = '+';
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else
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*p++ = *s;
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}
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*p = 0;
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return buffer;
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}
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