ncurses 6.2 - patch 20210418

[ncurses.git] / ncurses / tinfo / access.c

diff --git a/ncurses/tinfo/access.c b/ncurses/tinfo/access.c
index 44c7e1b2f5d129d366bcaf45341eaadbbbf39eb5..15593688266ef754f4fb28fc5ce4a35cea93a0d9 100644 (file)
--- a/ncurses/tinfo/access.c
+++ b/ncurses/tinfo/access.c
@@ -1,5 +1,6 @@
 /****************************************************************************
- * Copyright (c) 1998,2001,2003 Free Software Foundation, Inc.              *
+ * Copyright 2019,2020 Thomas E. Dickey                                     *
+ * Copyright 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            *
@@ -27,31 +28,38 @@
  ****************************************************************************/
 
 /****************************************************************************
- *  Author: Thomas E. Dickey <dickey@clark.net> 1998,2000,2001              *
+ *  Author: Thomas E. Dickey                                                *
  ****************************************************************************/
 
 #include <curses.priv.h>
+
+#include <ctype.h>
+
 #include <tic.h>
-#include <nc_alloc.h>
 
-MODULE_ID("$Id: access.c,v 1.10 2003/07/05 19:31:28 tom Exp $")
+MODULE_ID("$Id: access.c,v 1.27 2020/08/29 16:22:03 juergen Exp $")
 
 #define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
 
+#ifdef _NC_MSC
+# define ACCESS(FN, MODE) access((FN), (MODE)&(R_OK|W_OK))
+#else
+# define ACCESS access
+#endif
+
 NCURSES_EXPORT(char *)
 _nc_rootname(char *path)
 {
     char *result = _nc_basename(path);
-#if !defined(MIXEDCASE_FILENAMES) || defined(PROG_EXT)
+#if !MIXEDCASE_FILENAMES || defined(PROG_EXT)
     static char *temp;
     char *s;
 
     temp = strdup(result);
     result = temp;
-#if !defined(MIXEDCASE_FILENAMES)
-    int n;
+#if !MIXEDCASE_FILENAMES
     for (s = result; *s != '\0'; ++s) {
-       *s = LOWERCASE(*s);
+       *s = (char) LOWERCASE(*s);
     }
 #endif
 #if defined(PROG_EXT)
@@ -64,6 +72,21 @@ _nc_rootname(char *path)
     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
  */
@@ -79,7 +102,7 @@ _nc_pathlast(const char *path)
        test = path;
     else
        test++;
-    return (test - path);
+    return (unsigned) (test - path);
 }
 
 NCURSES_EXPORT(char *)
@@ -91,24 +114,59 @@ _nc_basename(char *path)
 NCURSES_EXPORT(int)
 _nc_access(const char *path, int mode)
 {
-    if (access(path, mode) < 0) {
+    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));
+           char *leaf;
 
+           _nc_STRCPY(head, path, sizeof(head));
+           leaf = _nc_basename(head);
            if (leaf == 0)
                leaf = head;
            *leaf = '\0';
            if (head == leaf)
-               (void) strcpy(head, ".");
+               _nc_STRCPY(head, ".", sizeof(head));
 
-           return access(head, R_OK | W_OK | X_OK);
+           result = ACCESS(head, R_OK | W_OK | X_OK);
+       } else {
+           result = -1;
        }
-       return -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
+       && 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 0;
+    return result;
 }
 
 #ifndef USE_ROOT_ENVIRON
@@ -127,6 +185,7 @@ _nc_env_access(void)
        || getgid() != getegid())
        return FALSE;
 #endif
-    return getuid() != 0 && geteuid() != 0;    /* ...finally, disallow root */
+    /* ...finally, disallow root */
+    return (getuid() != ROOT_UID) && (geteuid() != ROOT_UID);
 }
 #endif