1 /* $OpenBSD: frm_data.c,v 1.4 1998/07/24 02:37:27 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Juergen Pfeifer <Juergen.Pfeifer@T-Online.de> 1995,1997 * 33 ****************************************************************************/ 34 35 #include "form.priv.h" 36 37 MODULE_ID("$From: frm_data.c,v 1.4 1998/02/11 12:13:42 tom Exp $") 38 39 /*--------------------------------------------------------------------------- 40 | Facility : libnform 41 | Function : bool data_behind(const FORM *form) 42 | 43 | Description : Check for off-screen data behind. This is nearly trivial 44 | becose the begin of a field is fixed. 45 | 46 | Return Values : TRUE - there are off-screen data behind 47 | FALSE - there are no off-screen data behind 48 +--------------------------------------------------------------------------*/ 49 bool data_behind(const FORM *form) 50 { 51 bool result = FALSE; 52 53 if (form && (form->status & _POSTED) && form->current) 54 { 55 FIELD *field; 56 57 field = form->current; 58 if (!Single_Line_Field(field)) 59 { 60 result = (form->toprow==0) ? FALSE : TRUE; 61 } 62 else 63 { 64 result = (form->begincol==0) ? FALSE : TRUE; 65 } 66 } 67 return(result); 68 } 69 70 /*--------------------------------------------------------------------------- 71 | Facility : libnform 72 | Function : static char * After_Last_Non_Pad_Position( 73 | char *buffer, 74 | int len, 75 | int pad) 76 | 77 | Description : Find the last position in the buffer that doesn't 78 | contain a padding character. 79 | 80 | Return Values : The pointer to this position 81 +--------------------------------------------------------------------------*/ 82 INLINE 83 static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad) 84 { 85 char *end = buffer + len; 86 87 assert(buffer && len>=0); 88 while ( (buffer < end) && (*(end-1)==pad) ) 89 end--; 90 91 return end; 92 } 93 94 #define SMALL_BUFFER_SIZE (80) 95 96 /*--------------------------------------------------------------------------- 97 | Facility : libnform 98 | Function : bool data_ahead(const FORM *form) 99 | 100 | Description : Check for off-screen data ahead. This is more difficult 101 | because a dynamic field has a variable end. 102 | 103 | Return Values : TRUE - there are off-screen data ahead 104 | FALSE - there are no off-screen data ahead 105 +--------------------------------------------------------------------------*/ 106 bool 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