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NetBSD/gnu/dist/toolchain/gcc/prefix.c

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/* Utility to update paths from internal to external forms.
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This file contains routines to update a path, both to canonicalize
the directory format and to handle any prefix translation.
This file must be compiled with -DPREFIX= to specify the "prefix"
value used by configure. If a filename does not begin with this
prefix, it will not be affected other than by directory canonicalization.
Each caller of 'update_path' may specify both a filename and
a translation prefix and consist of the name of the package that contains
the file ("@GCC", "@BINUTIL", "@GNU", etc).
If the prefix is not specified, the filename will only undergo
directory canonicalization.
If it is specified, the string given by PREFIX will be replaced
by the specified prefix (with a '@' in front unless the prefix begins
with a '$') and further translation will be done as follows
until none of the two conditions below are met:
1) If the filename begins with '@', the string between the '@' and
the end of the name or the first '/' or directory separator will
be considered a "key" and looked up as follows:
-- If this is a Win32 OS, then the Registry will be examined for
an entry of "key" in
HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\
if found, that value will be used.
-- If not found (or not a Win32 OS), the environment variable
key_ROOT (the value of "key" concatenated with the constant "_ROOT")
is tried. If that fails, then PREFIX (see above) is used.
2) If the filename begins with a '$', the rest of the string up
to the end or the first '/' or directory separator will be used
as an environment variable, whose value will be returned.
Once all this is done, any '/' will be converted to DIR_SEPARATOR,
if they are different.
NOTE: using resolve_keyed_path under Win32 requires linking with
advapi32.dll. */
#include "config.h"
#include "system.h"
#ifdef _WIN32
#include <windows.h>
#endif
#include "prefix.h"
static const char *std_prefix = PREFIX;
static const char *get_key_value PROTO((char *));
static const char *translate_name PROTO((const char *));
static char *save_string PROTO((const char *, int));
#ifdef _WIN32
static char *lookup_key PROTO((char *));
static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
#endif
#ifndef DIR_SEPARATOR
# define IS_DIR_SEPARATOR(ch) ((ch) == '/')
#else /* DIR_SEPARATOR */
# ifndef DIR_SEPARATOR_2
# define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
# else /* DIR_SEPARATOR && DIR_SEPARATOR_2 */
# define IS_DIR_SEPARATOR(ch) \
(((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2))
# endif /* DIR_SEPARATOR && DIR_SEPARATOR_2 */
#endif /* DIR_SEPARATOR */
/* Given KEY, as above, return its value. */
static const char *
get_key_value (key)
char *key;
{
const char *prefix = 0;
char *temp = 0;
#ifdef _WIN32
prefix = lookup_key (key);
#endif
if (prefix == 0)
prefix = getenv (temp = concat (key, "_ROOT", NULL_PTR));
if (prefix == 0)
prefix = std_prefix;
if (temp)
free (temp);
return prefix;
}
/* Concatenate a sequence of strings, returning the result.
This function is based on the one in libiberty. */
char *
concat VPROTO((const char *first, ...))
{
register int length;
register char *newstr;
register char *end;
register const char *arg;
va_list args;
#ifndef ANSI_PROTOTYPES
const char *first;
#endif
/* First compute the size of the result and get sufficient memory. */
VA_START (args, first);
#ifndef ANSI_PROTOTYPES
first = va_arg (args, const char *);
#endif
arg = first;
length = 0;
while (arg != 0)
{
length += strlen (arg);
arg = va_arg (args, const char *);
}
newstr = (char *) malloc (length + 1);
va_end (args);
/* Now copy the individual pieces to the result string. */
VA_START (args, first);
#ifndef ANSI_PROTOTYPES
first = va_arg (args, char *);
#endif
end = newstr;
arg = first;
while (arg != 0)
{
while (*arg)
*end++ = *arg++;
arg = va_arg (args, const char *);
}
*end = '\000';
va_end (args);
return (newstr);
}
/* Return a copy of a string that has been placed in the heap. */
static char *
save_string (s, len)
const char *s;
int len;
{
register char *result = xmalloc (len + 1);
bcopy (s, result, len);
result[len] = 0;
return result;
}
#ifdef _WIN32
/* Look up "key" in the registry, as above. */
static char *
lookup_key (key)
char *key;
{
char *dst;
DWORD size;
DWORD type;
LONG res;
if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
{
res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
KEY_READ, &reg_key);
if (res == ERROR_SUCCESS)
res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
KEY_READ, &reg_key);
if (res != ERROR_SUCCESS)
{
reg_key = (HKEY) INVALID_HANDLE_VALUE;
return 0;
}
}
size = 32;
dst = (char *) malloc (size);
res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
if (res == ERROR_MORE_DATA && type == REG_SZ)
{
dst = (char *) realloc (dst, size);
res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
}
if (type != REG_SZ || res != ERROR_SUCCESS)
{
free (dst);
dst = 0;
}
return dst;
}
#endif
/* If NAME starts with a '@' or '$', apply the translation rules above
and return a new name. Otherwise, return the given name. */
static const char *
translate_name (name)
const char *name;
{
char code = name[0];
char *key;
const char *prefix = 0;
int keylen;
if (code != '@' && code != '$')
return name;
for (keylen = 0;
(name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
keylen++)
;
key = (char *) alloca (keylen + 1);
strncpy (key, &name[1], keylen);
key[keylen] = 0;
name = &name[keylen + 1];
if (code == '@')
{
prefix = get_key_value (key);
if (prefix == 0)
prefix = std_prefix;
}
else
prefix = getenv (key);
if (prefix == 0)
prefix = PREFIX;
/* Remove any trailing directory separator from what we got. */
if (IS_DIR_SEPARATOR (prefix[strlen (prefix) - 1]))
{
char * temp = save_string (prefix, strlen (prefix));
temp[strlen (temp) - 1] = 0;
prefix = temp;
}
return concat (prefix, name, NULL_PTR);
}
/* Update PATH using KEY if PATH starts with PREFIX. */
const char *
update_path (path, key)
const char *path;
const char *key;
{
if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
{
if (key[0] != '$')
key = concat ("@", key, NULL_PTR);
path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
while (path[0] == '@' || path[0] == '$')
path = translate_name (path);
}
#ifdef DIR_SEPARATOR_2
/* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
if (DIR_SEPARATOR != DIR_SEPARATOR_2)
{
int i;
int len = strlen (path);
char *new_path = save_string (path, len);
for (i = 0; i < len; i++)
if (new_path[i] == DIR_SEPARATOR_2)
new_path[i] = DIR_SEPARATOR;
path = new_path;
}
#endif
#if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
if (DIR_SEPARATOR != '/')
{
int i;
int len = strlen (path);
char *new_path = save_string (path, len);
for (i = 0; i < len; i++)
if (new_path[i] == '/')
new_path[i] = DIR_SEPARATOR;
path = new_path;
}
#endif
return path;
}
/* Reset the standard prefix */
void
set_std_prefix (prefix, len)
const char *prefix;
int len;
{
std_prefix = save_string (prefix, len);
}
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