libgfortran/intrinsics/string_intrinsics.c

   1 /* String intrinsics helper functions.
   2    Copyright 2008, 2009 Free Software Foundation, Inc.
   3
   4 This file is part of the GNU Fortran runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public
   8 License as published by the Free Software Foundation; either
   9 version 3 of the License, or (at your option) any later version.
  10
  11 Libgfortran 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
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25
  26 /* Unlike what the name of this file suggests, we don't actually
  27    implement the Fortran intrinsics here.  At least, not with the
  28    names they have in the standard.  The functions here provide all
  29    the support we need for the standard string intrinsics, and the
  30    compiler translates the actual intrinsics calls to calls to
  31    functions in this file.  */
  32
  33 #include "libgfortran.h"
  34
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <assert.h>
  38
  39
  40 /* Helper function to set parts of wide strings to a constant (usually
  41    spaces).  */
  42
  43 static gfc_char4_t *
  44 memset_char4 (gfc_char4_t *b, gfc_char4_t c, size_t len)
  45 {
  46   size_t i;
  47
  48   for (i = 0; i < len; i++)
  49     b[i] = c;
  50
  51   return b;
  52 }
  53
  54
  55 /* All other functions are defined using a few generic macros in
  56    string_intrinsics_inc.c, so we avoid code duplication between the
  57    various character type kinds.  */
  58
  59 #undef  CHARTYPE
  60 #define CHARTYPE char
  61 #undef  UCHARTYPE
  62 #define UCHARTYPE unsigned char
  63 #undef  SUFFIX
  64 #define SUFFIX(x) x
  65 #undef  MEMSET
  66 #define MEMSET memset
  67
  68 #include "string_intrinsics_inc.c"
  69
  70
  71 #undef  CHARTYPE
  72 #define CHARTYPE gfc_char4_t
  73 #undef  UCHARTYPE
  74 #define UCHARTYPE gfc_char4_t
  75 #undef  SUFFIX
  76 #define SUFFIX(x) x ## _char4
  77 #undef  MEMSET
  78 #define MEMSET memset_char4
  79
  80 #include "string_intrinsics_inc.c"
  81