X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Ftinfo%2Faccess.c;h=d9876875382dd6030195081602c531ff3c2c51ea;hp=54e549497c942646c1deba0b2133026c9fa42c37;hb=7af63696972b12659832a1c3413d9ace9641c8f6;hpb=0eb88fc5281804773e2a0c7a488a4452463535ce

diff --git a/ncurses/tinfo/access.c b/ncurses/tinfo/access.c
index 54e54949..d9876875 100644
--- a/ncurses/tinfo/access.c
+++ b/ncurses/tinfo/access.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright (c) 1998-2011,2012 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            *
@@ -27,29 +27,166 @@
  ****************************************************************************/
 
 /****************************************************************************
- *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
+ *  Author: Thomas E. Dickey                                                *
  ****************************************************************************/
 
-
 #include <curses.priv.h>
 
-MODULE_ID("$Id: access.c,v 1.1 1998/07/25 20:17:09 tom Exp $")
-
-int _nc_access(const char *path, int mode)
-{
-	if (access(path, mode) < 0) {
-		if ((mode & W_OK) != 0
-		 && errno == ENOENT) {
-			char head[PATH_MAX];
-			char *leaf = strrchr(strcpy(head, path), '/');
-			if (leaf == 0)
-				leaf = head;
-			*leaf = '\0';
-			if (head == leaf)
-				(void)strcpy(head, ".");
-			return access(head, R_OK|W_OK|X_OK);
-		}
-		return -1;
+#include <ctype.h>
+
+#include <tic.h>
+
+MODULE_ID("$Id: access.c,v 1.23 2012/09/01 19:21:29 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 = (char) 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_STRCPY(head, path, sizeof(head));
+	    leaf = _nc_basename(head);
+	    if (leaf == 0)
+		leaf = head;
+	    *leaf = '\0';
+	    if (head == leaf)
+		_nc_STRCPY(head, ".", sizeof(head));
+
+	    result = access(head, R_OK | W_OK | X_OK);
+	} else {
+	    result = -1;
 	}
-	return 0;
+    } 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
+	&& S_ISDIR(sb.st_mode)) {
+	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
+	&& S_ISREG(sb.st_mode)) {
+	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