(translate_040_to_space) [MOUNTED_GETMNTENT1]: New function.

[gnulib.git] / lib / mountlist.c

diff --git a/lib/mountlist.c b/lib/mountlist.c
index ac25ee1..c2c77b3 100644 (file)
--- a/lib/mountlist.c
+++ b/lib/mountlist.c
@@ -1,5 +1,5 @@
 /* mountlist.c -- return a list of mounted filesystems
-   Copyright (C) 1991, 1992, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1991, 1992, 1997, 1998, 1999 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -151,6 +151,46 @@ xatoi (char *cp)
     }
   return val;
 }
+
+/* Convert, in place, each unambiguous `\040' sequence in the NUL-terminated
+   string, STR, to a single space.  `unambiguous' means that it must not be
+   immediately preceded by an odd number of backslash characters.  */
+
+static void
+translate_040_to_space (char *str)
+{
+  while (1)
+    {
+      char *p;
+      char *backslash = strstr (str, "\\040");
+      unsigned int backslash_count = 0;
+
+      if (backslash == NULL)
+       break;
+
+      /* Count preceding backslashes, going no further than str.  */
+      for (p = backslash - 1; p >= str && *p == '\\'; p--)
+       ++backslash_count;
+
+      if (backslash_count % 2 == 1)
+       {
+         /* The backslash is escaped;  advance past the 040 and
+            continue searching.  */
+         str = backslash + 4;
+         continue;
+       }
+
+      /* We found an unambiguous `\040'.  Replace it with a space
+        and move everything following it back by 3 bytes.
+         The source and destination regions may overlap, so we have
+        to use memmove.  */
+      *backslash = ' ';
+      str = backslash + 1;
+      /* Be sure to copy the trailing NUL byte, too.  */
+      memmove (str, backslash + 4, strlen (backslash + 4) + 1);
+    }
+}
+
 #endif /* MOUNTED_GETMNTENT1.  */
 
 #if MOUNTED_GETMNTINFO
@@ -349,6 +389,11 @@ read_filesystem_list (int need_fs_type)
        else
          me->me_dev = (dev_t) -1;      /* Magic; means not known yet. */
 
+       /* FIXME: do the conversion only if we're using some version of
+          GNU libc -- which one?  */
+       /* Convert each `\040' string to a space.  */
+       translate_040_to_space (me->me_mountdir);
+
        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
@@ -672,3 +717,18 @@ read_filesystem_list (int need_fs_type)
     return NULL;
   }
 }
+
+#ifdef TEST
+int
+main (int argc, char **argv)
+{
+  int i;
+  for (i = 1; i < argc; i++)
+    {
+      char *p = xstrdup (argv[i]);
+      translate_040_to_space (p);
+      printf ("%s: %s\n", argv[i], p);
+    }
+  exit (0);
+}
+#endif