cmdline.c

   1 /*
   2  * Copyright 2005 Timo Hirvonen
   3  */
   4
   5 #include <cmdline.h>
   6
   7 #include <uchar.h>
   8 #include <xmalloc.h>
   9 #include <debug.h>
  10
  11 struct cmdline cmdline;
  12
  13 #define SANITY_CHECK() \
  14         do { \
  15                 BUG_ON(cmdline.bpos > cmdline.blen); \
  16                 BUG_ON(cmdline.bpos < 0); \
  17                 BUG_ON(cmdline.cpos < 0); \
  18         } while (0)
  19
  20
  21 void cmdline_init(void)
  22 {
  23         cmdline.blen = 0;
  24         cmdline.clen = 0;
  25         cmdline.bpos = 0;
  26         cmdline.cpos = 0;
  27         cmdline.size = 128;
  28         cmdline.line = xnew(char, cmdline.size);
  29         cmdline.line[0] = 0;
  30 }
  31
  32 void cmdline_insert_ch(uchar ch)
  33 {
  34         int size;
  35
  36         SANITY_CHECK();
  37
  38         size = u_char_size(ch);
  39         if (cmdline.blen + size > cmdline.size) {
  40                 cmdline.size *= 2;
  41                 cmdline.line = xrenew(char, cmdline.line, cmdline.size);
  42         }
  43         memmove(cmdline.line + cmdline.bpos + size,
  44                 cmdline.line + cmdline.bpos,
  45                 cmdline.blen - cmdline.bpos + 1);
  46         u_set_char_raw(cmdline.line, &cmdline.bpos, ch);
  47         cmdline.cpos++;
  48         cmdline.blen += size;
  49         cmdline.clen++;
  50 }
  51
  52 void cmdline_backspace(void)
  53 {
  54         int bpos, size;
  55
  56         SANITY_CHECK();
  57
  58         if (cmdline.bpos == 0)
  59                 return;
  60
  61         bpos = cmdline.bpos;
  62         u_prev_char_pos(cmdline.line, &bpos);
  63         size = cmdline.bpos - bpos;
  64
  65         memmove(cmdline.line + bpos,
  66                 cmdline.line + cmdline.bpos,
  67                 cmdline.blen - cmdline.bpos + 1);
  68         cmdline.bpos -= size;
  69         cmdline.cpos--;
  70         cmdline.blen -= size;
  71         cmdline.clen--;
  72 }
  73
  74 void cmdline_delete_ch(void)
  75 {
  76         uchar ch;
  77         int size, bpos;
  78
  79         SANITY_CHECK();
  80
  81         if (cmdline.bpos == cmdline.blen)
  82                 return;
  83         bpos = cmdline.bpos;
  84         u_get_char(cmdline.line, &bpos, &ch);
  85         size = u_char_size(ch);
  86         cmdline.blen -= size;
  87         cmdline.clen--;
  88         memmove(cmdline.line + cmdline.bpos,
  89                 cmdline.line + cmdline.bpos + size,
  90                 cmdline.blen - cmdline.bpos + 1);
  91 }
  92
  93 void cmdline_set_text(const char *text)
  94 {
  95         int len = strlen(text);
  96
  97         if (len >= cmdline.size) {
  98                 while (len >= cmdline.size)
  99                         cmdline.size *= 2;
 100                 cmdline.line = xrenew(char, cmdline.line, cmdline.size);
 101         }
 102         memcpy(cmdline.line, text, len + 1);
 103         cmdline.cpos = u_strlen(cmdline.line);
 104         cmdline.bpos = len;
 105         cmdline.clen = cmdline.cpos;
 106         cmdline.blen = len;
 107 }
 108
 109 void cmdline_clear(void)
 110 {
 111         cmdline.blen = 0;
 112         cmdline.clen = 0;
 113         cmdline.bpos = 0;
 114         cmdline.cpos = 0;
 115         cmdline.line[0] = 0;
 116 }
 117
 118 void cmdline_move_left(void)
 119 {
 120         SANITY_CHECK();
 121
 122         if (cmdline.bpos > 0) {
 123                 cmdline.cpos--;
 124                 u_prev_char_pos(cmdline.line, &cmdline.bpos);
 125         }
 126 }
 127
 128 void cmdline_move_right(void)
 129 {
 130         SANITY_CHECK();
 131
 132         if (cmdline.bpos < cmdline.blen) {
 133                 uchar ch;
 134
 135                 u_get_char(cmdline.line, &cmdline.bpos, &ch);
 136                 cmdline.cpos++;
 137         }
 138 }
 139
 140 void cmdline_move_home(void)
 141 {
 142         SANITY_CHECK();
 143
 144         cmdline.cpos = 0;
 145         cmdline.bpos = 0;
 146 }
 147
 148 void cmdline_move_end(void)
 149 {
 150         SANITY_CHECK();
 151
 152         cmdline.cpos = cmdline.clen;
 153         cmdline.bpos = cmdline.blen;
 154 }