libgfortran/runtime/string.c

   1 /* Copyright (C) 2002-2003 Free Software Foundation, Inc.
   2    Contributed by Paul Brook
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfor).
   5
   6 Libgfor 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 2, or (at your option)
   9 any later version.
  10
  11 Libgfor 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 You should have received a copy of the GNU General Public License
  17 along with libgfor; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "config.h"
  22 #include <string.h>
  23
  24 #include "libgfortran.h"
  25
  26
  27 /* Compare a C-style string with a fortran style string in a case-insensitive
  28    manner.  Used for decoding string options to various statements.  Returns
  29    zero if not equal, nonzero if equal.  */
  30
  31 static int
  32 compare0 (const char *s1, int s1_len, const char *s2)
  33 {
  34   int i;
  35
  36   if (strncasecmp (s1, s2, s1_len) != 0)
  37     return 0;
  38
  39   /* The rest of s1 needs to be blanks for equality.  */
  40
  41   for (i = strlen (s2); i < s1_len; i++)
  42     if (s1[i] != ' ')
  43       return 0;
  44
  45   return 1;
  46 }
  47
  48
  49 /* Given a fortran string, return its length exclusive of the trailing
  50    spaces.  */
  51 int
  52 fstrlen (const char *string, int len)
  53 {
  54   for (len--; len >= 0; len--)
  55     if (string[len] != ' ')
  56       break;
  57
  58   return len + 1;
  59 }
  60
  61
  62 void
  63 fstrcpy (char *dest, int destlen, const char *src, int srclen)
  64 {
  65   if (srclen >= destlen)
  66     {
  67       /* This will truncate if too long.  */
  68       memcpy (dest, src, destlen);
  69     }
  70   else
  71     {
  72       memcpy (dest, src, srclen);
  73       /* Pad with spaces.  */
  74       memset (&dest[srclen], ' ', destlen - srclen);
  75     }
  76 }
  77
  78
  79 void
  80 cf_strcpy (char *dest, int dest_len, const char *src)
  81 {
  82   int src_len;
  83
  84   src_len = strlen (src);
  85
  86   if (src_len >= dest_len)
  87     {
  88       /* This will truncate if too long.  */
  89       memcpy (dest, src, dest_len);
  90     }
  91   else
  92     {
  93       memcpy (dest, src, src_len);
  94       /* Pad with spaces.  */
  95       memset (&dest[src_len], ' ', dest_len - src_len);
  96     }
  97 }
  98
  99
 100 /* Given a fortran string and an array of st_option structures, search through
 101    the array to find a match.  If the option is not found, we generate an error
 102    if no default is provided.  */
 103
 104 int
 105 find_option (const char *s1, int s1_len, st_option * opts,
 106              const char *error_message)
 107 {
 108   for (; opts->name; opts++)
 109     if (compare0 (s1, s1_len, opts->name))
 110       return opts->value;
 111
 112   generate_error (ERROR_BAD_OPTION, error_message);
 113
 114   return -1;
 115 }