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ncursesw-morphos/ncurses/tinfo/access.c
Thomas E. Dickey d1a026123a ncurses 5.9 - patch 20110528
+ add case to CF_SHARED_OPTS for Interix (patch by Markus Duft).
+ used ncurses/link_test to check for behavior when the terminal has
  not been initialized and when an application passes null pointers
  to the library.  Added checks to cover this (prompted by Redhat
  ).
+ modify MKlib_gen.sh to make its main() function call each function
  with zero parameters, to help find inconsistent checking for null
  pointers, etc.
2011-05-29 00:20:42 +00:00

192 lines
5.2 KiB
C

/****************************************************************************
* Copyright (c) 1998-2010,2011 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Thomas E. Dickey *
****************************************************************************/
#include <curses.priv.h>
#include <ctype.h>
#include <sys/stat.h>
#include <tic.h>
MODULE_ID("$Id: access.c,v 1.18 2011/05/28 23:05:12 tom Exp $")
#ifdef __TANDEM
#define ROOT_UID 65535
#endif
#ifndef ROOT_UID
#define ROOT_UID 0
#endif
#define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
NCURSES_EXPORT(char *)
_nc_rootname(char *path)
{
char *result = _nc_basename(path);
#if !MIXEDCASE_FILENAMES || defined(PROG_EXT)
static char *temp;
char *s;
temp = strdup(result);
result = temp;
#if !MIXEDCASE_FILENAMES
for (s = result; *s != '\0'; ++s) {
*s = LOWERCASE(*s);
}
#endif
#if defined(PROG_EXT)
if ((s = strrchr(result, '.')) != 0) {
if (!strcmp(s, PROG_EXT))
*s = '\0';
}
#endif
#endif
return result;
}
/*
* Check if a string appears to be an absolute pathname.
*/
NCURSES_EXPORT(bool)
_nc_is_abs_path(const char *path)
{
#if defined(__EMX__) || defined(__DJGPP__)
#define is_pathname(s) ((((s) != 0) && ((s)[0] == '/')) \
|| (((s)[0] != 0) && ((s)[1] == ':')))
#else
#define is_pathname(s) ((s) != 0 && (s)[0] == '/')
#endif
return is_pathname(path);
}
/*
* Return index of the basename
*/
NCURSES_EXPORT(unsigned)
_nc_pathlast(const char *path)
{
const char *test = strrchr(path, '/');
#ifdef __EMX__
if (test == 0)
test = strrchr(path, '\\');
#endif
if (test == 0)
test = path;
else
test++;
return (unsigned) (test - path);
}
NCURSES_EXPORT(char *)
_nc_basename(char *path)
{
return path + _nc_pathlast(path);
}
NCURSES_EXPORT(int)
_nc_access(const char *path, int mode)
{
int result;
if (path == 0) {
result = -1;
} else if (access(path, mode) < 0) {
if ((mode & W_OK) != 0
&& errno == ENOENT
&& strlen(path) < PATH_MAX) {
char head[PATH_MAX];
char *leaf = _nc_basename(strcpy(head, path));
if (leaf == 0)
leaf = head;
*leaf = '\0';
if (head == leaf)
(void) strcpy(head, ".");
result = access(head, R_OK | W_OK | X_OK);
} else {
result = -1;
}
} else {
result = 0;
}
return result;
}
NCURSES_EXPORT(bool)
_nc_is_dir_path(const char *path)
{
bool result = FALSE;
struct stat sb;
if (stat(path, &sb) == 0
&& (sb.st_mode & S_IFMT) == S_IFDIR) {
result = TRUE;
}
return result;
}
NCURSES_EXPORT(bool)
_nc_is_file_path(const char *path)
{
bool result = FALSE;
struct stat sb;
if (stat(path, &sb) == 0
&& (sb.st_mode & S_IFMT) == S_IFREG) {
result = TRUE;
}
return result;
}
#ifndef USE_ROOT_ENVIRON
/*
* Returns true if we allow application to use environment variables that are
* used for searching lists of directories, etc.
*/
NCURSES_EXPORT(int)
_nc_env_access(void)
{
#if HAVE_ISSETUGID
if (issetugid())
return FALSE;
#elif HAVE_GETEUID && HAVE_GETEGID
if (getuid() != geteuid()
|| getgid() != getegid())
return FALSE;
#endif
/* ...finally, disallow root */
return (getuid() != ROOT_UID) && (geteuid() != ROOT_UID);
}
#endif