libgfortran/intrinsics/string_intrinsics.c

   1 /* String intrinsics helper functions.
   2    Copyright 2008 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 2 of the License, or (at your option) any later version.
  10
  11 In addition to the permissions in the GNU General Public License, the
  12 Free Software Foundation gives you unlimited permission to link the
  13 compiled version of this file into combinations with other programs,
  14 and to distribute those combinations without any restriction coming
  15 from the use of this file.  (The General Public License restrictions
  16 do apply in other respects; for example, they cover modification of
  17 the file, and distribution when not linked into a combine
  18 executable.)
  19
  20 Libgfortran is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public
  26 License along with libgfortran; see the file COPYING.  If not,
  27 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  28 Boston, MA 02110-1301, USA.  */
  29
  30
  31 /* Unlike what the name of this file suggests, we don't actually
  32    implement the Fortran intrinsics here.  At least, not with the
  33    names they have in the standard.  The functions here provide all
  34    the support we need for the standard string intrinsics, and the
  35    compiler translates the actual intrinsics calls to calls to
  36    functions in this file.  */
  37
  38 #include "libgfortran.h"
  39
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43
  44 /* Helper function to set parts of wide strings to a constant (usually
  45    spaces).  */
  46
  47 static gfc_char4_t *
  48 memset_char4 (gfc_char4_t *b, gfc_char4_t c, size_t len)
  49 {
  50   size_t i;
  51
  52   for (i = 0; i < len; i++)
  53     b[i] = c;
  54
  55   return b;
  56 }
  57
  58
  59 /* All other functions are defined using a few generic macros in
  60    string_intrinsics_inc.c, so we avoid code duplication between the
  61    various character type kinds.  */
  62
  63 #undef  CHARTYPE
  64 #define CHARTYPE char
  65 #undef  UCHARTYPE
  66 #define UCHARTYPE unsigned char
  67 #undef  SUFFIX
  68 #define SUFFIX(x) x
  69 #undef  MEMSET
  70 #define MEMSET memset
  71
  72 #include "string_intrinsics_inc.c"
  73
  74
  75 #undef  CHARTYPE
  76 #define CHARTYPE gfc_char4_t
  77 #undef  UCHARTYPE
  78 #define UCHARTYPE gfc_char4_t
  79 #undef  SUFFIX
  80 #define SUFFIX(x) x ## _char4
  81 #undef  MEMSET
  82 #define MEMSET memset_char4
  83
  84 #include "string_intrinsics_inc.c"
  85