libgfortran/intrinsics/string_intrinsics.c

   1 /* String intrinsics helper functions.
   2    Copyright (C) 2008-2015 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 /* Compare wide character types, which are handled internally as
  55    unsigned 4-byte integers.  */
  56 int
  57 memcmp_char4 (const void *a, const void *b, size_t len)
  58 {
  59   const GFC_UINTEGER_4 *pa = a;
  60   const GFC_UINTEGER_4 *pb = b;
  61   while (len-- > 0)
  62     {
  63       if (*pa != *pb)
  64         return *pa < *pb ? -1 : 1;
  65       pa ++;
  66       pb ++;
  67     }
  68   return 0;
  69 }
  70
  71
  72 /* All other functions are defined using a few generic macros in
  73    string_intrinsics_inc.c, so we avoid code duplication between the
  74    various character type kinds.  */
  75
  76 #undef  CHARTYPE
  77 #define CHARTYPE char
  78 #undef  UCHARTYPE
  79 #define UCHARTYPE unsigned char
  80 #undef  SUFFIX
  81 #define SUFFIX(x) x
  82 #undef  MEMSET
  83 #define MEMSET memset
  84 #undef  MEMCMP
  85 #define MEMCMP memcmp
  86
  87 #include "string_intrinsics_inc.c"
  88
  89
  90 #undef  CHARTYPE
  91 #define CHARTYPE gfc_char4_t
  92 #undef  UCHARTYPE
  93 #define UCHARTYPE gfc_char4_t
  94 #undef  SUFFIX
  95 #define SUFFIX(x) x ## _char4
  96 #undef  MEMSET
  97 #define MEMSET memset_char4
  98 #undef  MEMCMP
  99 #define MEMCMP memcmp_char4
 100
 101 #include "string_intrinsics_inc.c"
 102