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/* Convert file names between Cygwin syntax and Windows syntax.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
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/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
#include <config.h>
/* Specification. */
#include "cygpath.h"
#include <stdlib.h>
#include "xalloc.h"
#include "gettext.h"
#define _(msgid) dgettext ("gnulib", msgid)
#ifdef __CYGWIN__
/* Since Cygwin has its own notion of mount points (which can be defined by the
user), it would be wrong to blindly convert '/cygdrive/c/foo' to 'C:\foo'.
We really need to use the Cygwin API or the 'cygpath' program. */
# include <errno.h>
# include <error.h>
# if 1
/* Documentation:
https://cygwin.com/cygwin-api/func-cygwin-conv-path.html */
# include <sys/cygwin.h>
char *
cygpath_w (const char *filename)
{
int repeat;
/* Try several times, since there is a small time window during which the
size returned by the previous call may not be sufficient, namely when a
directory gets renamed. */
for (repeat = 3; repeat > 0; repeat--)
{
ssize_t size = cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_RELATIVE, filename, NULL, 0);
if (size < 0)
error (EXIT_FAILURE, errno, _("cannot convert file name '%s' to Windows syntax"), filename);
char *result = (char *) xmalloc (size);
if (cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_RELATIVE, filename, result, size) == 0)
return result;
free (result);
}
error (EXIT_FAILURE, errno, _("cygwin_conv_path failed"));
return NULL;
}
# else
/* Alternative implementation (slower) */
/* Documentation:
https://cygwin.com/cygwin-ug-net/cygpath.html */
# include <stdio.h>
# include "spawn-pipe.h"
# include "wait-process.h"
/* Executes a program.
Returns the first line of its output, as a freshly allocated string, or
NULL. */
static char *
execute_and_read_line (const char *progname,
const char *prog_path, const char * const *prog_argv)
{
pid_t child;
int fd[1];
FILE *fp;
char *line;
size_t linesize;
size_t linelen;
/* Open a pipe to the program. */
child = create_pipe_in (progname, prog_path, prog_argv, NULL, NULL,
DEV_NULL, false, true, false, fd);
if (child == -1)
return NULL;
/* Retrieve its result. */
fp = fdopen (fd[0], "r");
if (fp == NULL)
error (EXIT_FAILURE, errno, _("fdopen() failed"));
line = NULL; linesize = 0;
linelen = getline (&line, &linesize, fp);
if (linelen == (size_t)(-1))
{
error (0, 0, _("%s subprocess I/O error"), progname);
fclose (fp);
wait_subprocess (child, progname, true, false, true, false, NULL);
}
else
{
int exitstatus;
if (linelen > 0 && line[linelen - 1] == '\n')
line[linelen - 1] = '\0';
/* Read until EOF (otherwise the child process may get a SIGPIPE signal). */
while (getc (fp) != EOF)
;
fclose (fp);
/* Remove zombie process from process list, and retrieve exit status. */
exitstatus =
wait_subprocess (child, progname, true, false, true, false, NULL);
if (exitstatus == 0)
return line;
}
free (line);
return NULL;
}
char *
cygpath_w (const char *filename)
{
const char *argv[4];
argv[0] = "cygpath";
argv[1] = "-w";
argv[2] = filename;
argv[3] = NULL;
char *line = execute_and_read_line ("cygpath", "cygpath", argv);
if (line == NULL || line[0] == '\0')
error (EXIT_FAILURE, 0, _("%s invocation failed"), "cygpath");
return line;
}
# endif
#else
char *
cygpath_w (const char *filename)
{
return xstrdup (filename);
}
#endif
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