avr/con-utils.c

   1 /*
   2  * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <string.h>
   8 #include "common.h"
   9
  10 #include "serial.h"
  11 #include "background.h"
  12 #include "con-utils.h"
  13
  14 uint_fast8_t tstc(void)
  15 {
  16         bg_shed();
  17         return serial_tstc();
  18 }
  19
  20 int my_getchar(uint_fast8_t waitforchar)
  21 {
  22         int c;
  23
  24         do {
  25                 bg_shed();
  26                 c = serial_getc();
  27         } while ((c < 0) && waitforchar);
  28
  29         return c;
  30 }
  31
  32
  33 /* test if ctrl-c was pressed */
  34
  35 static uint_fast8_t ctrlc_disabled;     /* see disable_ctrl() */
  36 static uint_fast8_t ctrlc_was_pressed;
  37
  38 uint_fast8_t ctrlc(void)
  39 {
  40         if (!ctrlc_disabled) {
  41                 switch (serial_getc()) {
  42                 case 0x03:              /* ^C - Control C */
  43                         ctrlc_was_pressed = 1;
  44                         return 1;
  45                 default:
  46                         break;
  47                 }
  48         }
  49         return 0;
  50 }
  51
  52 /* Reads user's confirmation.
  53    Returns 1 if user's input is "y", "Y", "yes" or "YES"
  54 */
  55 uint_fast8_t confirm_yesno(void)
  56 {
  57         unsigned int i;
  58         char str_input[5];
  59
  60         /* Flush input */
  61         while (serial_getc())
  62                 ;
  63         i = 0;
  64         while (i < sizeof(str_input)) {
  65                 str_input[i] = my_getchar(1);
  66                 putchar(str_input[i]);
  67                 if (str_input[i] == '\r')
  68                         break;
  69                 i++;
  70         }
  71         putchar('\n');
  72         if (strncmp(str_input, "y\r", 2) == 0 ||
  73             strncmp(str_input, "Y\r", 2) == 0 ||
  74             strncmp(str_input, "yes\r", 4) == 0 ||
  75             strncmp(str_input, "YES\r", 4) == 0)
  76                 return 1;
  77         return 0;
  78 }
  79
  80 /* pass 1 to disable ctrlc() checking, 0 to enable.
  81  * returns previous state
  82  */
  83 uint_fast8_t disable_ctrlc(uint_fast8_t disable)
  84 {
  85         uint_fast8_t prev = ctrlc_disabled;     /* save previous state */
  86
  87         ctrlc_disabled = disable;
  88         return prev;
  89 }
  90
  91 uint_fast8_t had_ctrlc (void)
  92 {
  93         return ctrlc_was_pressed;
  94 }
  95
  96 void clear_ctrlc(void)
  97 {
  98         ctrlc_was_pressed = 0;
  99 }