pith/margin.c

   1 #if !defined(lint) && !defined(DOS)
   2 static char rcsid[] = "$Id: margin.c 1032 2008-04-11 00:30:04Z hubert@u.washington.edu $";
   3 #endif
   4
   5 /*
   6  * ========================================================================
   7  * Copyright 2013-2018 Eduardo Chappa
   8  * Copyright 2006-2008 University of Washington
   9  *
  10  * Licensed under the Apache License, Version 2.0 (the "License");
  11  * you may not use this file except in compliance with the License.
  12  * You may obtain a copy of the License at
  13  *
  14  *     http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * ========================================================================
  17  */
  18
  19 /*======================================================================
  20
  21      margin.c
  22      Implements message data gathering and formatting
  23
  24   ====*/
  25
  26
  27 #include "../pith/headers.h"
  28 #include "../pith/string.h"
  29 #include "../pith/state.h"
  30 #include "../pith/conf.h"
  31
  32
  33 /*
  34  * Internal prototypes
  35  */
  36
  37
  38 /*
  39  * format_view_margin - return sane value for vertical margins
  40  */
  41 int *
  42 format_view_margin(void)
  43 {
  44     static int margin[2];
  45     char tmp[100], e[200], *err, lastchar = 0;
  46     int left = 0, right = 0, leftm = 0, rightm = 0;
  47     size_t l;
  48
  49     memset(margin, 0, sizeof(margin));
  50
  51     /*
  52      * We initially tried to make sure that the user didn't shoot themselves
  53      * in the foot by setting this too small. People seem to want to do some
  54      * strange stuff, so we're going to relax the wild shot detection and
  55      * let people set what they want, until we get to the point of totally
  56      * absurd. We've also added the possibility of appending the letter c
  57      * onto the width. That means treat the value as an absolute column
  58      * instead of a width. That is, a right margin of 76c means wrap at
  59      * column 76, whereas right margin of 4 means to wrap at column
  60      * screen width - 4.
  61      */
  62     if(ps_global->VAR_VIEW_MARGIN_LEFT){
  63         strncpy(tmp, ps_global->VAR_VIEW_MARGIN_LEFT, sizeof(tmp)-1);
  64         tmp[sizeof(tmp)-1] = '\0';
  65         removing_leading_and_trailing_white_space(tmp);
  66         if(tmp[0]){
  67             l = strlen(tmp);
  68             if(l > 0)
  69               lastchar = tmp[l-1];
  70
  71             if(lastchar == 'c')
  72               tmp[l-1] = '\0';
  73
  74             if((err = strtoval(tmp, &left, 0, 0, 0, e, sizeof(e), "Viewer-margin-left")) != NULL){
  75                 leftm = 0;
  76                 dprint((2, "%s\n", err));
  77             }
  78             else{
  79                 if(lastchar == 'c')
  80                   leftm = left-1;
  81                 else
  82                   leftm = left;
  83
  84                 leftm = MIN(MAX(0, leftm), ps_global->ttyo->screen_cols);
  85             }
  86         }
  87     }
  88
  89     if(ps_global->VAR_VIEW_MARGIN_RIGHT){
  90         strncpy(tmp, ps_global->VAR_VIEW_MARGIN_RIGHT, sizeof(tmp)-1);
  91         tmp[sizeof(tmp)-1] = '\0';
  92         removing_leading_and_trailing_white_space(tmp);
  93         if(tmp[0]){
  94             l = strlen(tmp);
  95             if(l > 0)
  96               lastchar = tmp[l-1];
  97
  98             if(lastchar == 'c')
  99               tmp[l-1] = '\0';
 100
 101             if((err = strtoval(tmp, &right, 0, 0, 0, e, sizeof(e), "Viewer-margin-right")) != NULL){
 102                 rightm = 0;
 103                 dprint((2, "%s\n", err));
 104             }
 105             else{
 106                 if(lastchar == 'c')
 107                   rightm = ps_global->ttyo->screen_cols - right;
 108                 else
 109                   rightm = right;
 110
 111                 rightm = MIN(MAX(0, rightm), ps_global->ttyo->screen_cols);
 112             }
 113         }
 114     }
 115
 116     if((rightm > 0 || leftm > 0) && rightm >= 0 && leftm >= 0
 117        && ps_global->ttyo->screen_cols - rightm - leftm >= 8){
 118         margin[0] = leftm;
 119         margin[1] = rightm;
 120     }
 121
 122     return(margin);
 123 }
 124
 125
 126 /*
 127  * Give a margin for help and such
 128  */
 129 int *
 130 non_messageview_margin(void)
 131 {
 132     static int margin[2];
 133
 134     margin[0] = 0;
 135     margin[1] = 4;
 136
 137     return(margin);
 138 }