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/* Utility functions for finding files relative to GCC binaries.
Copyright (C) 1992-2021 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "filenames.h"
#include "file-find.h"
static bool debug = false;
void
find_file_set_debug (bool debug_state)
{
debug = debug_state;
}
char *
find_a_file (struct path_prefix *pprefix, const char *name, int mode)
{
char *temp;
struct prefix_list *pl;
int len = pprefix->max_len + strlen (name) + 1;
if (debug)
fprintf (stderr, "Looking for '%s'\n", name);
#ifdef HOST_EXECUTABLE_SUFFIX
len += strlen (HOST_EXECUTABLE_SUFFIX);
#endif
temp = XNEWVEC (char, len);
/* Determine the filename to execute (special case for absolute paths). */
if (IS_ABSOLUTE_PATH (name))
{
if (access (name, mode) == 0)
{
strcpy (temp, name);
if (debug)
fprintf (stderr, " - found: absolute path\n");
return temp;
}
#ifdef HOST_EXECUTABLE_SUFFIX
/* Some systems have a suffix for executable files.
So try appending that. */
strcpy (temp, name);
strcat (temp, HOST_EXECUTABLE_SUFFIX);
if (access (temp, mode) == 0)
return temp;
#endif
if (debug)
fprintf (stderr, " - failed to locate using absolute path\n");
}
else
for (pl = pprefix->plist; pl; pl = pl->next)
{
struct stat st;
strcpy (temp, pl->prefix);
strcat (temp, name);
if (stat (temp, &st) >= 0
&& ! S_ISDIR (st.st_mode)
&& access (temp, mode) == 0)
return temp;
#ifdef HOST_EXECUTABLE_SUFFIX
/* Some systems have a suffix for executable files.
So try appending that. */
strcat (temp, HOST_EXECUTABLE_SUFFIX);
if (stat (temp, &st) >= 0
&& ! S_ISDIR (st.st_mode)
&& access (temp, mode) == 0)
return temp;
#endif
}
if (debug && pprefix->plist == NULL)
fprintf (stderr, " - failed: no entries in prefix list\n");
free (temp);
return 0;
}
/* Add an entry for PREFIX to prefix list PREFIX.
Add at beginning if FIRST is true. */
void
do_add_prefix (struct path_prefix *pprefix, const char *prefix, bool first)
{
struct prefix_list *pl, **prev;
int len;
if (pprefix->plist && !first)
{
for (pl = pprefix->plist; pl->next; pl = pl->next)
;
prev = &pl->next;
}
else
prev = &pprefix->plist;
/* Keep track of the longest prefix. */
len = strlen (prefix);
if (len > pprefix->max_len)
pprefix->max_len = len;
pl = XNEW (struct prefix_list);
pl->prefix = xstrdup (prefix);
if (*prev)
pl->next = *prev;
else
pl->next = (struct prefix_list *) 0;
*prev = pl;
}
/* Add an entry for PREFIX at the end of prefix list PREFIX. */
void
add_prefix (struct path_prefix *pprefix, const char *prefix)
{
do_add_prefix (pprefix, prefix, false);
}
/* Add an entry for PREFIX at the begin of prefix list PREFIX. */
void
add_prefix_begin (struct path_prefix *pprefix, const char *prefix)
{
do_add_prefix (pprefix, prefix, true);
}
/* Take the value of the environment variable ENV, break it into a path, and
add of the entries to PPREFIX. */
void
prefix_from_env (const char *env, struct path_prefix *pprefix)
{
const char *p;
p = getenv (env);
if (p)
prefix_from_string (p, pprefix);
}
void
prefix_from_string (const char *p, struct path_prefix *pprefix)
{
const char *startp, *endp;
char *nstore = XNEWVEC (char, strlen (p) + 3);
if (debug)
fprintf (stderr, "Convert string '%s' into prefixes, separator = '%c'\n", p, PATH_SEPARATOR);
startp = endp = p;
while (1)
{
if (*endp == PATH_SEPARATOR || *endp == 0)
{
strncpy (nstore, startp, endp-startp);
if (endp == startp)
{
strcpy (nstore, "./");
}
else if (! IS_DIR_SEPARATOR (endp[-1]))
{
nstore[endp-startp] = DIR_SEPARATOR;
nstore[endp-startp+1] = 0;
}
else
nstore[endp-startp] = 0;
if (debug)
fprintf (stderr, " - add prefix: %s\n", nstore);
add_prefix (pprefix, nstore);
if (*endp == 0)
break;
endp = startp = endp + 1;
}
else
endp++;
}
free (nstore);
}
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