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: frm_data.c,v 1.7 2000/12/10 02:09:38 tom Exp $") 36 37 /*--------------------------------------------------------------------------- 38 | Facility : libnform 39 | Function : bool data_behind(const FORM *form) 40 | 41 | Description : Check for off-screen data behind. This is nearly trivial 42 | becose the begin of a field is fixed. 43 | 44 | Return Values : TRUE - there are off-screen data behind 45 | FALSE - there are no off-screen data behind 46 +--------------------------------------------------------------------------*/ 47 NCURSES_EXPORT(bool) 48 data_behind (const FORM *form) 49 { 50 bool result = FALSE; 51 52 if (form && (form->status & _POSTED) && form->current) 53 { 54 FIELD *field; 55 56 field = form->current; 57 if (!Single_Line_Field(field)) 58 { 59 result = (form->toprow==0) ? FALSE : TRUE; 60 } 61 else 62 { 63 result = (form->begincol==0) ? FALSE : TRUE; 64 } 65 } 66 return(result); 67 } 68 69 /*--------------------------------------------------------------------------- 70 | Facility : libnform 71 | Function : static char * After_Last_Non_Pad_Position( 72 | char *buffer, 73 | int len, 74 | int pad) 75 | 76 | Description : Find the last position in the buffer that doesn't 77 | contain a padding character. 78 | 79 | Return Values : The pointer to this position 80 +--------------------------------------------------------------------------*/ 81 INLINE 82 static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad) 83 { 84 char *end = buffer + len; 85 86 assert(buffer && len>=0); 87 while ( (buffer < end) && (*(end-1)==pad) ) 88 end--; 89 90 return end; 91 } 92 93 #define SMALL_BUFFER_SIZE (80) 94 95 /*--------------------------------------------------------------------------- 96 | Facility : libnform 97 | Function : bool data_ahead(const FORM *form) 98 | 99 | Description : Check for off-screen data ahead. This is more difficult 100 | because a dynamic field has a variable end. 101 | 102 | Return Values : TRUE - there are off-screen data ahead 103 | FALSE - there are no off-screen data ahead 104 +--------------------------------------------------------------------------*/ 105 NCURSES_EXPORT(bool) 106 data_ahead (const FORM *form) 107 { 108 bool result = FALSE; 109 110 if (form && (form->status & _POSTED) && form->current) 111 { 112 static char buffer[SMALL_BUFFER_SIZE + 1]; 113 FIELD *field; 114 bool large_buffer; 115 bool cursor_moved = FALSE; 116 char *bp; 117 char *found_content; 118 int pos; 119 120 field = form->current; 121 assert(form->w); 122 123 large_buffer = (field->cols > SMALL_BUFFER_SIZE); 124 if (large_buffer) 125 bp = (char *)malloc((size_t)(field->cols) + 1); 126 else 127 bp = buffer; 128 129 assert(bp); 130 131 if (Single_Line_Field(field)) 132 { 133 int check_len; 134 135 pos = form->begincol + field->cols; 136 while (pos < field->dcols) 137 { 138 check_len = field->dcols - pos; 139 if ( check_len >= field->cols ) 140 check_len = field->cols; 141 cursor_moved = TRUE; 142 wmove(form->w,0,pos); 143 winnstr(form->w,bp,check_len); 144 found_content = 145 After_Last_Non_Pad_Position(bp,check_len,field->pad); 146 if (found_content==bp) 147 pos += field->cols; 148 else 149 { 150 result = TRUE; 151 break; 152 } 153 } 154 } 155 else 156 { 157 pos = form->toprow + field->rows; 158 while (pos < field->drows) 159 { 160 cursor_moved = TRUE; 161 wmove(form->w,pos,0); 162 pos++; 163 winnstr(form->w,bp,field->cols); 164 found_content = 165 After_Last_Non_Pad_Position(bp,field->cols,field->pad); 166 if (found_content!=bp) 167 { 168 result = TRUE; 169 break; 170 } 171 } 172 } 173 174 if (large_buffer) 175 free(bp); 176 177 if (cursor_moved) 178 wmove(form->w,form->currow,form->curcol); 179 } 180 return(result); 181 } 182 183 /* frm_data.c ends here */ 184