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 (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 2, or (at your option)
   9 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 License
  26 along with libgfortran; see the file COPYING.  If not, write to
  27 the Free Software Foundation, 59 Temple Place - Suite 330,
  28 Boston, MA 02111-1307, USA.  */
  29
  30 #include "config.h"
  31 #include <string.h>
  32
  33 #include "libgfortran.h"
  34
  35
  36 /* Compare a C-style string with a fortran style string in a case-insensitive
  37    manner.  Used for decoding string options to various statements.  Returns
  38    zero if not equal, nonzero if equal.  */
  39
  40 static int
  41 compare0 (const char *s1, int s1_len, const char *s2)
  42 {
  43   int i;
  44
  45   if (strncasecmp (s1, s2, s1_len) != 0)
  46     return 0;
  47
  48   /* The rest of s1 needs to be blanks for equality.  */
  49
  50   for (i = strlen (s2); i < s1_len; i++)
  51     if (s1[i] != ' ')
  52       return 0;
  53
  54   return 1;
  55 }
  56
  57
  58 /* Given a fortran string, return its length exclusive of the trailing
  59    spaces.  */
  60 int
  61 fstrlen (const char *string, int len)
  62 {
  63   for (len--; len >= 0; len--)
  64     if (string[len] != ' ')
  65       break;
  66
  67   return len + 1;
  68 }
  69
  70
  71 void
  72 fstrcpy (char *dest, int destlen, const char *src, int srclen)
  73 {
  74   if (srclen >= destlen)
  75     {
  76       /* This will truncate if too long.  */
  77       memcpy (dest, src, destlen);
  78     }
  79   else
  80     {
  81       memcpy (dest, src, srclen);
  82       /* Pad with spaces.  */
  83       memset (&dest[srclen], ' ', destlen - srclen);
  84     }
  85 }
  86
  87
  88 void
  89 cf_strcpy (char *dest, int dest_len, const char *src)
  90 {
  91   int src_len;
  92
  93   src_len = strlen (src);
  94
  95   if (src_len >= dest_len)
  96     {
  97       /* This will truncate if too long.  */
  98       memcpy (dest, src, dest_len);
  99     }
 100   else
 101     {
 102       memcpy (dest, src, src_len);
 103       /* Pad with spaces.  */
 104       memset (&dest[src_len], ' ', dest_len - src_len);
 105     }
 106 }
 107
 108
 109 /* Given a fortran string and an array of st_option structures, search through
 110    the array to find a match.  If the option is not found, we generate an error
 111    if no default is provided.  */
 112
 113 int
 114 find_option (const char *s1, int s1_len, st_option * opts,
 115              const char *error_message)
 116 {
 117   for (; opts->name; opts++)
 118     if (compare0 (s1, s1_len, opts->name))
 119       return opts->value;
 120
 121   generate_error (ERROR_BAD_OPTION, error_message);
 122
 123   return -1;
 124 }