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/* Auxiliary functions for the creation of subprocesses on Windows.
Copyright (C) 2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2024.
This file 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.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "windows-path.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *
extended_PATH (const char * const *dll_dirs)
{
/* Create a string PATH=(dll_dirs[0];dll_dirs[1];...;)old_PATH */
const char *old_PATH = getenv ("PATH");
if (old_PATH == NULL)
old_PATH = "";
size_t size;
{
size = 5;
{
size_t i;
for (i = 0; dll_dirs[i] != NULL; i++)
size += strlen (dll_dirs[i]) + 1;
}
size += strlen (old_PATH) + 1;
}
char *new_PATH = (char *) malloc (size);
if (new_PATH == NULL)
return NULL;
{
char *p = new_PATH;
{
memcpy (p, "PATH=", 5);
p += 5;
}
{
size_t i;
for (i = 0; dll_dirs[i] != NULL; i++)
{
size_t l = strlen (dll_dirs[i]);
memcpy (p, dll_dirs[i], l);
p += l;
#if defined _WIN32 && !defined __CYGWIN__
*p++ = ';';
#else
*p++ = ':';
#endif
}
}
{
size_t l = strlen (old_PATH);
memcpy (p, old_PATH, l);
p += l;
*p = '\0';
}
}
return new_PATH;
}
char **
extended_environ (const char * const *dll_dirs)
{
char *child_PATH = extended_PATH (dll_dirs);
if (child_PATH == NULL)
return NULL;
/* Create a shallow copy of environ, adding the child_PATH and removing
the original "PATH=..." string.
This is a bit hairy, because we don't have a lock that would prevent
other threads from making modifications in ENVP. So, just make sure
we don't crash; but if other threads are making modifications, part
of the result may be wrong. */
char **envp;
#if defined _WIN32 && !defined __CYGWIN__
envp = _environ;
#else
envp = environ;
#endif
retry:
{
/* Guess the size of the needed block of memory.
The guess will be exact if other threads don't make modifications. */
size_t size = 0;
{
char **ep;
char *p;
for (ep = envp; (p = *ep) != NULL; ep++)
if (strncmp (p, "PATH=", 5) != 0)
size += 1;
}
char **new_environ = (char **) malloc ((1 + size + 1) * sizeof (char *));
if (new_environ == NULL)
{
free (child_PATH);
errno = ENOMEM;
return NULL;
}
char **nep = new_environ;
*nep++ = child_PATH;
{
size_t i = 0;
char **ep;
char *p;
for (ep = envp; (p = *ep) != NULL; ep++)
if (strncmp (p, "PATH=", 5) != 0)
{
if (i == size)
{
/* Other threads did modifications. Restart. */
free (new_environ);
goto retry;
}
*nep++ = p;
i += 1;
}
if (i < size)
{
/* Other threads did modifications. Restart. */
free (new_environ);
goto retry;
}
}
*nep = NULL;
return new_environ;
}
}
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