avr/con-utils.c

   1
   2 #include <string.h>
   3 #include "common.h"
   4
   5 #include "serial.h"
   6 #include "background.h"
   7 #include "con-utils.h"
   8
   9 uint_fast8_t tstc(void)
  10 {
  11         bg_shed();
  12         return serial_tstc();
  13 }
  14
  15 int my_getchar(uint_fast8_t waitforchar)
  16 {
  17         int c;
  18
  19         do {
  20                 bg_shed();
  21                 c = serial_getc();
  22         } while ((c < 0) && waitforchar);
  23
  24         return c;
  25 }
  26
  27
  28 /* test if ctrl-c was pressed */
  29
  30 static uint_fast8_t ctrlc_disabled;     /* see disable_ctrl() */
  31 static uint_fast8_t ctrlc_was_pressed;
  32
  33 uint_fast8_t ctrlc(void)
  34 {
  35         if (!ctrlc_disabled) {
  36                 switch (serial_getc()) {
  37                 case 0x03:              /* ^C - Control C */
  38                         ctrlc_was_pressed = 1;
  39                         return 1;
  40                 default:
  41                         break;
  42                 }
  43         }
  44         return 0;
  45 }
  46
  47 /* Reads user's confirmation.
  48    Returns 1 if user's input is "y", "Y", "yes" or "YES"
  49 */
  50 uint_fast8_t confirm_yesno(void)
  51 {
  52         unsigned int i;
  53         char str_input[5];
  54
  55         /* Flush input */
  56         while (serial_getc())
  57                 ;
  58         i = 0;
  59         while (i < sizeof(str_input)) {
  60                 str_input[i] = my_getchar(1);
  61                 putchar(str_input[i]);
  62                 if (str_input[i] == '\r')
  63                         break;
  64                 i++;
  65         }
  66         putchar('\n');
  67         if (strncmp(str_input, "y\r", 2) == 0 ||
  68             strncmp(str_input, "Y\r", 2) == 0 ||
  69             strncmp(str_input, "yes\r", 4) == 0 ||
  70             strncmp(str_input, "YES\r", 4) == 0)
  71                 return 1;
  72         return 0;
  73 }
  74
  75 /* pass 1 to disable ctrlc() checking, 0 to enable.
  76  * returns previous state
  77  */
  78 uint_fast8_t disable_ctrlc(uint_fast8_t disable)
  79 {
  80         uint_fast8_t prev = ctrlc_disabled;     /* save previous state */
  81
  82         ctrlc_disabled = disable;
  83         return prev;
  84 }
  85
  86 uint_fast8_t had_ctrlc (void)
  87 {
  88         return ctrlc_was_pressed;
  89 }
  90
  91 void clear_ctrlc(void)
  92 {
  93         ctrlc_was_pressed = 0;
  94 }
  95