1 | /* gdbmsetopt.c - set options pertaining to a GDBM descriptor. */
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2 |
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3 | /* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
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4 | Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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5 |
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6 | GDBM is free software; you can redistribute it and/or modify
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7 | it under the terms of the GNU General Public License as published by
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8 | the Free Software Foundation; either version 2, or (at your option)
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9 | any later version.
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10 |
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11 | GDBM is distributed in the hope that it will be useful,
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | GNU General Public License for more details.
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15 |
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16 | You should have received a copy of the GNU General Public License
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17 | along with GDBM; see the file COPYING. If not, write to
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18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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19 |
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20 | You may contact the original author by:
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21 | e-mail: [email protected]
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22 | us-mail: Philip A. Nelson
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23 | Computer Science Department
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24 | Western Washington University
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25 | Bellingham, WA 98226
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26 |
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27 | The author of this file is:
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28 | e-mail: [email protected]
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29 |
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30 | *************************************************************************/
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31 |
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32 |
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33 | /* include system configuration before all else. */
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34 | #include "autoconf.h"
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35 |
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36 | #include "gdbmdefs.h"
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37 | #include "gdbmerrno.h"
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38 |
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39 | /* operate on an already open descriptor. */
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40 |
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41 | /* ARGSUSED */
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42 | int
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43 | gdbm_setopt(dbf, optflag, optval, optlen)
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44 | gdbm_file_info *dbf; /* descriptor to operate on. */
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45 | int optflag; /* option to set. */
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46 | int *optval; /* pointer to option value. */
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47 | int optlen; /* size of optval. */
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48 | {
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49 | switch(optflag)
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50 | {
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51 | case GDBM_CACHESIZE:
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52 | /* Optval will point to the new size of the cache. */
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53 | if (dbf->bucket_cache != NULL)
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54 | {
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55 | gdbm_errno = GDBM_OPT_ALREADY_SET;
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56 | return(-1);
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57 | }
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58 |
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59 | return(_gdbm_init_cache(dbf, ((*optval) > 9) ? (*optval) : 10));
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60 |
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61 | case GDBM_FASTMODE:
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62 | /* Obsolete form of SYNCMODE. */
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63 | if ((*optval != TRUE) && (*optval != FALSE))
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64 | {
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65 | gdbm_errno = GDBM_OPT_ILLEGAL;
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66 | return(-1);
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67 | }
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68 |
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69 | dbf->fast_write = *optval;
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70 | break;
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71 |
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72 | case GDBM_SYNCMODE:
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73 | /* Optval will point to either true or false. */
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74 | if ((*optval != TRUE) && (*optval != FALSE))
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75 | {
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76 | gdbm_errno = GDBM_OPT_ILLEGAL;
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77 | return(-1);
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78 | }
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79 |
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80 | dbf->fast_write = !(*optval);
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81 | break;
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82 |
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83 | case GDBM_CENTFREE:
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84 | /* Optval will point to either true or false. */
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85 | if ((*optval != TRUE) && (*optval != FALSE))
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86 | {
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87 | gdbm_errno = GDBM_OPT_ILLEGAL;
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88 | return(-1);
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89 | }
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90 |
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91 | dbf->fast_write = *optval;
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92 | break;
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93 |
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94 | case GDBM_COALESCEBLKS:
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95 | /* Optval will point to either true or false. */
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96 | if ((*optval != TRUE) && (*optval != FALSE))
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97 | {
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98 | gdbm_errno = GDBM_OPT_ILLEGAL;
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99 | return(-1);
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100 | }
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101 |
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102 | dbf->fast_write = *optval;
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103 | break;
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104 |
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105 | default:
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106 | gdbm_errno = GDBM_OPT_ILLEGAL;
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107 | return(-1);
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108 | }
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109 |
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110 | return(0);
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111 | }
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