libiberty/lbasename.c

   1 /* Libiberty basename.  Like basename, but is not overridden by the
   2    system C library.
   3    Copyright (C) 2001-2023 Free Software Foundation, Inc.
   4
   5 This file is part of the libiberty library.
   6 Libiberty is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 Libiberty is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with libiberty; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /*
  22
  23 @deftypefn Replacement {const char*} lbasename (const char *@var{name})
  24
  25 Given a pointer to a string containing a typical pathname
  26 (@samp{/usr/src/cmd/ls/ls.c} for example), returns a pointer to the
  27 last component of the pathname (@samp{ls.c} in this case).  The
  28 returned pointer is guaranteed to lie within the original
  29 string.  This latter fact is not true of many vendor C
  30 libraries, which return special strings or modify the passed
  31 strings for particular input.
  32
  33 In particular, the empty string returns the same empty string,
  34 and a path ending in @code{/} returns the empty string after it.
  35
  36 @end deftypefn
  37
  38 */
  39
  40 #ifdef HAVE_CONFIG_H
  41 #include "config.h"
  42 #endif
  43 #include "ansidecl.h"
  44 #include "libiberty.h"
  45 #include "safe-ctype.h"
  46 #include "filenames.h"
  47
  48 const char *
  49 unix_lbasename (const char *name)
  50 {
  51   const char *base;
  52
  53   for (base = name; *name; name++)
  54     if (IS_UNIX_DIR_SEPARATOR (*name))
  55       base = name + 1;
  56
  57   return base;
  58 }
  59
  60 const char *
  61 dos_lbasename (const char *name)
  62 {
  63   const char *base;
  64
  65   /* Skip over a possible disk name.  */
  66   if (ISALPHA (name[0]) && name[1] == ':')
  67     name += 2;
  68
  69   for (base = name; *name; name++)
  70     if (IS_DOS_DIR_SEPARATOR (*name))
  71       base = name + 1;
  72
  73   return base;
  74 }
  75
  76 const char *
  77 lbasename (const char *name)
  78 {
  79 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
  80   return dos_lbasename (name);
  81 #else
  82   return unix_lbasename (name);
  83 #endif
  84 }