2021-03-04 10:16:48 +01:00
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/* w32-misc.c - Helper functions needed in Windows
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* Copyright (C) 2021 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file 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 <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "util.h"
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#include "w32help.h"
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/* Return the number of backslashes. */
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static unsigned int
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count_backslashes (const char *s)
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{
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unsigned int count = 0;
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for ( ;*s == '\\'; s++)
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count++;
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return count;
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}
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static void
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strip_one_arg (char *string, int endquote)
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2021-03-04 10:16:48 +01:00
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{
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char *s, *d;
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unsigned int n, i;
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for (s=d=string; *s; s++)
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if (*s == '\\')
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{
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n = count_backslashes (s);
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if (s[n] == '"')
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{
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for (i=0; i < n/2; i++)
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*d++ = '\\';
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if ((n&1)) /* Odd number of backslashes. */
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*d++ = '"'; /* Print the quote. */
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}
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2021-03-04 12:30:30 +01:00
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else if (!s[n] && endquote)
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{
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for (i=0; i < n/2; i++)
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*d++ = '\\';
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s--;
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}
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2021-03-04 10:16:48 +01:00
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else /* Print all backslashes. */
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{
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for (i=0; i < n; i++)
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*d++ = '\\';
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n--; /* Adjust for the increment in the for. */
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}
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s += n;
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}
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else if (*s == '"' && s[1])
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*d++ = *++s;
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else
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*d++ = *s;
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*d = 0;
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}
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/* Helper for parse_w32_commandline. */
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static int
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parse_cmdstring (char *string, char **argv)
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{
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int argc = 0;
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int inquote = 0;
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char *p0, *p;
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unsigned int n;
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p0 = string;
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for (p=string; *p; p++)
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{
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if (inquote)
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{
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if (*p == '\\' && p[1] == '"')
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p++;
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else if (*p == '\\' && p[1] == '\\')
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p++;
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else if (*p == '"')
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{
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if (p[1] == ' ' || p[1] == '\t' || !p[1])
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{
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if (argv)
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{
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*p = 0;
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strip_one_arg (p0, 1);
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argv[argc] = p0;
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}
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argc++;
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p0 = NULL;
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}
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inquote = 0;
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}
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}
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else if (*p == '\\' && (n=count_backslashes (p)))
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{
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if (!p0) /* First non-WS; set start. */
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p0 = p;
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if (p[n] == '"')
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{
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if (!(n&1)) /* Even number. */
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inquote = 1;
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p++;
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}
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p += n;
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}
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else if (*p == '"')
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{
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inquote = 1;
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if (!p0 || p == string) /* First non-WS or first char; set start. */
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p0 = p + 1;
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}
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else if (*p == ' ' || *p == '\t')
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{
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if (p0) /* We are in an argument and reached WS. */
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{
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if (argv)
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{
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*p = 0;
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strip_one_arg (p0, inquote);
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argv[argc] = p0;
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}
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argc++;
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p0 = NULL;
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}
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}
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else if (!p0) /* First non-WS; set start. */
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p0 = p;
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}
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if (inquote || p0)
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{
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/* Closing quote missing (we accept this as argument anyway) or
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* an open argument. */
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if (argv)
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{
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*p = 0;
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strip_one_arg (p0, inquote);
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argv[argc] = p0;
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}
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argc++;
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}
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return argc;
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}
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/* This is a Windows command line parser, returning an array with
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* strings and its count. The argument CMDLINE is expected to be
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* utf-8 encoded and may be modified after returning from this
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* function. The returned array points into CMDLINE, so this should
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* not be freed. If GLOBING is set to true globing is done for all
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* items. Returns NULL on error. The number of items in the array is
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* returned at R_ARGC. */
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char **
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w32_parse_commandline (char *cmdline, int globing, int *r_argc)
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{
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int argc, i;
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char **argv;
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(void)globing;
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argc = parse_cmdstring (cmdline, NULL);
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if (!argc)
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{
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log_error ("%s failed: %s\n", __func__, "internal error");
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return NULL; /* Ooops. */
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}
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argv = xtrycalloc (argc+1, sizeof *argv);
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if (!argv)
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{
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log_error ("%s failed: %s\n", __func__, strerror (errno));
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return NULL; /* Ooops. */
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}
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i = parse_cmdstring (cmdline, argv);
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if (argc != i)
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{
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log_error ("%s failed (argc=%d i=%d)\n", __func__, argc, i);
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xfree (argv);
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return NULL; /* Ooops. */
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}
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*r_argc = argc;
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return argv;
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}
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