1 /**************************************************************************** 2 * Copyright (c) 1998 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 1.6 1999/05/16 17:20:29 juergen 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 bool data_behind(const FORM *form) 48 { 49 bool result = FALSE; 50 51 if (form && (form->status & _POSTED) && form->current) 52 { 53 FIELD *field; 54 55 field = form->current; 56 if (!Single_Line_Field(field)) 57 { 58 result = (form->toprow==0) ? FALSE : TRUE; 59 } 60 else 61 { 62 result = (form->begincol==0) ? FALSE : TRUE; 63 } 64 } 65 return(result); 66 } 67 68 /*--------------------------------------------------------------------------- 69 | Facility : libnform 70 | Function : static char * After_Last_Non_Pad_Position( 71 | char *buffer, 72 | int len, 73 | int pad) 74 | 75 | Description : Find the last position in the buffer that doesn't 76 | contain a padding character. 77 | 78 | Return Values : The pointer to this position 79 +--------------------------------------------------------------------------*/ 80 INLINE 81 static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad) 82 { 83 char *end = buffer + len; 84 85 assert(buffer && len>=0); 86 while ( (buffer < end) && (*(end-1)==pad) ) 87 end--; 88 89 return end; 90 } 91 92 #define SMALL_BUFFER_SIZE (80) 93 94 /*--------------------------------------------------------------------------- 95 | Facility : libnform 96 | Function : bool data_ahead(const FORM *form) 97 | 98 | Description : Check for off-screen data ahead. This is more difficult 99 | because a dynamic field has a variable end. 100 | 101 | Return Values : TRUE - there are off-screen data ahead 102 | FALSE - there are no off-screen data ahead 103 +--------------------------------------------------------------------------*/ 104 bool data_ahead(const FORM *form) 105 { 106 bool result = FALSE; 107 108 if (form && (form->status & _POSTED) && form->current) 109 { 110 static char buffer[SMALL_BUFFER_SIZE + 1]; 111 FIELD *field; 112 bool large_buffer; 113 bool cursor_moved = FALSE; 114 char *bp; 115 char *found_content; 116 int pos; 117 118 field = form->current; 119 assert(form->w); 120 121 large_buffer = (field->cols > SMALL_BUFFER_SIZE); 122 if (large_buffer) 123 bp = (char *)malloc((size_t)(field->cols) + 1); 124 else 125 bp = buffer; 126 127 assert(bp); 128 129 if (Single_Line_Field(field)) 130 { 131 int check_len; 132 133 pos = form->begincol + field->cols; 134 while (pos < field->dcols) 135 { 136 check_len = field->dcols - pos; 137 if ( check_len >= field->cols ) 138 check_len = field->cols; 139 cursor_moved = TRUE; 140 wmove(form->w,0,pos); 141 winnstr(form->w,bp,check_len); 142 found_content = 143 After_Last_Non_Pad_Position(bp,check_len,field->pad); 144 if (found_content==bp) 145 pos += field->cols; 146 else 147 { 148 result = TRUE; 149 break; 150 } 151 } 152 } 153 else 154 { 155 pos = form->toprow + field->rows; 156 while (pos < field->drows) 157 { 158 cursor_moved = TRUE; 159 wmove(form->w,pos,0); 160 pos++; 161 winnstr(form->w,bp,field->cols); 162 found_content = 163 After_Last_Non_Pad_Position(bp,field->cols,field->pad); 164 if (found_content!=bp) 165 { 166 result = TRUE; 167 break; 168 } 169 } 170 } 171 172 if (large_buffer) 173 free(bp); 174 175 if (cursor_moved) 176 wmove(form->w,form->currow,form->curcol); 177 } 178 return(result); 179 } 180 181 /* frm_data.c ends here */ 182