1 /**************************************************************************** 2 * Copyright (c) 1998,2000 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997 * 31 ****************************************************************************/ 32 33 #include "form.priv.h" 34 35 MODULE_ID("$Id: fld_newftyp.c,v 1.6 2000/12/10 02:09:38 tom Exp $") 36 37 static FIELDTYPE const default_fieldtype = { 38 0, /* status */ 39 0L, /* reference count */ 40 (FIELDTYPE *)0, /* pointer to left operand */ 41 (FIELDTYPE *)0, /* pointer to right operand */ 42 NULL, /* makearg function */ 43 NULL, /* copyarg function */ 44 NULL, /* freearg function */ 45 NULL, /* field validation function */ 46 NULL, /* Character check function */ 47 NULL, /* enumerate next function */ 48 NULL /* enumerate previous function */ 49 }; 50 51 NCURSES_EXPORT_VAR(const FIELDTYPE*) _nc_Default_FieldType = &default_fieldtype; 52 53 /*--------------------------------------------------------------------------- 54 | Facility : libnform 55 | Function : FIELDTYPE *new_fieldtype( 56 | bool (* const field_check)(FIELD *,const void *), 57 | bool (* const char_check) (int, const void *) ) 58 | 59 | Description : Create a new fieldtype. The application programmer must 60 | write a field_check and a char_check function and give 61 | them as input to this call. 62 | If an error occurs, errno is set to 63 | E_BAD_ARGUMENT - invalid arguments 64 | E_SYSTEM_ERROR - system error (no memory) 65 | 66 | Return Values : Fieldtype pointer or NULL if error occured 67 +--------------------------------------------------------------------------*/ 68 NCURSES_EXPORT(FIELDTYPE *) 69 new_fieldtype ( 70 bool (* const field_check)(FIELD *,const void *), 71 bool (* const char_check) (int,const void *) ) 72 { 73 FIELDTYPE *nftyp = (FIELDTYPE *)0; 74 75 if ( (field_check) || (char_check) ) 76 { 77 nftyp = (FIELDTYPE *)malloc(sizeof(FIELDTYPE)); 78 if (nftyp) 79 { 80 *nftyp = default_fieldtype; 81 nftyp->fcheck = field_check; 82 nftyp->ccheck = char_check; 83 } 84 else 85 { 86 SET_ERROR( E_SYSTEM_ERROR ); 87 } 88 } 89 else 90 { 91 SET_ERROR( E_BAD_ARGUMENT ); 92 } 93 return nftyp; 94 } 95 96 /*--------------------------------------------------------------------------- 97 | Facility : libnform 98 | Function : int free_fieldtype(FIELDTYPE *typ) 99 | 100 | Description : Release the memory associated with this fieldtype. 101 | 102 | Return Values : E_OK - success 103 | E_CONNECTED - there are fields referencing the type 104 | E_BAD_ARGUMENT - invalid fieldtype pointer 105 +--------------------------------------------------------------------------*/ 106 NCURSES_EXPORT(int) 107 free_fieldtype (FIELDTYPE *typ) 108 { 109 if (!typ) 110 RETURN(E_BAD_ARGUMENT); 111 112 if (typ->ref!=0) 113 RETURN(E_CONNECTED); 114 115 if (typ->status & _RESIDENT) 116 RETURN(E_CONNECTED); 117 118 if (typ->status & _LINKED_TYPE) 119 { 120 if (typ->left ) typ->left->ref--; 121 if (typ->right) typ->right->ref--; 122 } 123 free(typ); 124 RETURN(E_OK); 125 } 126 127 /* fld_newftyp.c ends here */ 128