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

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