libgfortran/runtime/string.c

   1 /* Copyright (C) 2002-2013 Free Software Foundation, Inc.
   2    Contributed by Paul Brook
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 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 #include "libgfortran.h"
  26 #include <string.h>
  27
  28
  29 /* Given a fortran string, return its length exclusive of the trailing
  30    spaces.  */
  31
  32 gfc_charlen_type
  33 fstrlen (const char *string, gfc_charlen_type len)
  34 {
  35   for (; len > 0; len--)
  36     if (string[len-1] != ' ')
  37       break;
  38
  39   return len;
  40 }
  41
  42
  43 /* Copy a Fortran string (not null-terminated, hence length arguments
  44    for both source and destination strings. Returns the non-padded
  45    length of the destination.  */
  46
  47 gfc_charlen_type
  48 fstrcpy (char *dest, gfc_charlen_type destlen,
  49          const char *src, gfc_charlen_type srclen)
  50 {
  51   if (srclen >= destlen)
  52     {
  53       /* This will truncate if too long.  */
  54       memcpy (dest, src, destlen);
  55       return destlen;
  56     }
  57   else
  58     {
  59       memcpy (dest, src, srclen);
  60       /* Pad with spaces.  */
  61       memset (&dest[srclen], ' ', destlen - srclen);
  62       return srclen;
  63     }
  64 }
  65
  66
  67 /* Copy a null-terminated C string to a non-null-terminated Fortran
  68    string. Returns the non-padded length of the destination string.  */
  69
  70 gfc_charlen_type
  71 cf_strcpy (char *dest, gfc_charlen_type dest_len, const char *src)
  72 {
  73   size_t src_len;
  74
  75   src_len = strlen (src);
  76
  77   if (src_len >= (size_t) dest_len)
  78     {
  79       /* This will truncate if too long.  */
  80       memcpy (dest, src, dest_len);
  81       return dest_len;
  82     }
  83   else
  84     {
  85       memcpy (dest, src, src_len);
  86       /* Pad with spaces.  */
  87       memset (&dest[src_len], ' ', dest_len - src_len);
  88       return src_len;
  89     }
  90 }
  91
  92
  93 /* Given a fortran string and an array of st_option structures, search through
  94    the array to find a match.  If the option is not found, we generate an error
  95    if no default is provided.  */
  96
  97 int
  98 find_option (st_parameter_common *cmp, const char *s1, gfc_charlen_type s1_len,
  99              const st_option * opts, const char *error_message)
 100 {
 101   /* Strip trailing blanks from the Fortran string.  */
 102   size_t len = (size_t) fstrlen (s1, s1_len);
 103
 104   for (; opts->name; opts++)
 105     if (len == strlen(opts->name) && strncasecmp (s1, opts->name, len) == 0)
 106       return opts->value;
 107
 108   generate_error (cmp, LIBERROR_BAD_OPTION, error_message);
 109
 110   return -1;
 111 }