pith/margin.c

   1 /*
   2  * ========================================================================
   3  * Copyright 2013-2022 Eduardo Chappa
   4  * Copyright 2006-2008 University of Washington
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * ========================================================================
  13  */
  14
  15 /*======================================================================
  16
  17      margin.c
  18      Implements message data gathering and formatting
  19
  20   ====*/
  21
  22
  23 #include "../pith/headers.h"
  24 #include "../pith/string.h"
  25 #include "../pith/state.h"
  26 #include "../pith/conf.h"
  27
  28
  29 /*
  30  * Internal prototypes
  31  */
  32
  33
  34 /*
  35  * format_view_margin - return sane value for vertical margins
  36  */
  37 int *
  38 format_view_margin(void)
  39 {
  40     static int margin[2];
  41     char tmp[100], e[200], *err, lastchar = 0;
  42     int left = 0, right = 0, leftm = 0, rightm = 0;
  43     size_t l;
  44
  45     memset(margin, 0, sizeof(margin));
  46
  47     /*
  48      * We initially tried to make sure that the user didn't shoot themselves
  49      * in the foot by setting this too small. People seem to want to do some
  50      * strange stuff, so we're going to relax the wild shot detection and
  51      * let people set what they want, until we get to the point of totally
  52      * absurd. We've also added the possibility of appending the letter c
  53      * onto the width. That means treat the value as an absolute column
  54      * instead of a width. That is, a right margin of 76c means wrap at
  55      * column 76, whereas right margin of 4 means to wrap at column
  56      * screen width - 4.
  57      */
  58     if(ps_global->VAR_VIEW_MARGIN_LEFT){
  59         strncpy(tmp, ps_global->VAR_VIEW_MARGIN_LEFT, sizeof(tmp)-1);
  60         tmp[sizeof(tmp)-1] = '\0';
  61         removing_leading_and_trailing_white_space(tmp);
  62         if(tmp[0]){
  63             l = strlen(tmp);
  64             if(l > 0)
  65               lastchar = tmp[l-1];
  66
  67             if(lastchar == 'c')
  68               tmp[l-1] = '\0';
  69
  70             if((err = strtoval(tmp, &left, 0, 0, 0, e, sizeof(e), "Viewer-margin-left")) != NULL){
  71                 leftm = 0;
  72                 dprint((2, "%s\n", err));
  73             }
  74             else{
  75                 if(lastchar == 'c')
  76                   leftm = left-1;
  77                 else
  78                   leftm = left;
  79
  80                 leftm = MIN(MAX(0, leftm), ps_global->ttyo->screen_cols);
  81             }
  82         }
  83     }
  84
  85     if(ps_global->VAR_VIEW_MARGIN_RIGHT){
  86         strncpy(tmp, ps_global->VAR_VIEW_MARGIN_RIGHT, sizeof(tmp)-1);
  87         tmp[sizeof(tmp)-1] = '\0';
  88         removing_leading_and_trailing_white_space(tmp);
  89         if(tmp[0]){
  90             l = strlen(tmp);
  91             if(l > 0)
  92               lastchar = tmp[l-1];
  93
  94             if(lastchar == 'c')
  95               tmp[l-1] = '\0';
  96
  97             if((err = strtoval(tmp, &right, 0, 0, 0, e, sizeof(e), "Viewer-margin-right")) != NULL){
  98                 rightm = 0;
  99                 dprint((2, "%s\n", err));
 100             }
 101             else{
 102                 if(lastchar == 'c')
 103                   rightm = ps_global->ttyo->screen_cols - right;
 104                 else
 105                   rightm = right;
 106
 107                 rightm = MIN(MAX(0, rightm), ps_global->ttyo->screen_cols);
 108             }
 109         }
 110     }
 111
 112     if((rightm > 0 || leftm > 0) && rightm >= 0 && leftm >= 0
 113        && ps_global->ttyo->screen_cols - rightm - leftm >= 8){
 114         margin[0] = leftm;
 115         margin[1] = rightm;
 116     }
 117
 118     return(margin);
 119 }
 120
 121
 122 /*
 123  * Give a margin for help and such
 124  */
 125 int *
 126 non_messageview_margin(void)
 127 {
 128     static int margin[2];
 129
 130     margin[0] = 0;
 131     margin[1] = 4;
 132
 133     return(margin);
 134 }