C++ readchar函数代码示例

/*
 * get_line:
 *      Reads the next line up to '\n' or EOF.  Multiple spaces are
 *	compressed to one space; a space is inserted before a ','
 */
char *
get_line(void)
{
	size_t pos;
	int c, oy, ox;
	WINDOW *oscr;

	oscr = stdscr;
	stdscr = Msgwin;
	getyx(stdscr, oy, ox);
	refresh();
	/* loop reading in the string, and put it in a temporary buffer */
	for (pos = 0; (c = readchar()) != '\n'; clrtoeol(), refresh()) {
			if (c == erasechar()) {	/* process erase character */
				if (pos > 0) {
					int i;

					pos--;
					for (i = strlen(unctrl(linebuf[pos])); i; i--)
						addch('\b');
				}
				continue;
			} else
				if (c == killchar()) {	/* process kill
							 * character */
					pos = 0;
					move(oy, ox);
					continue;
				} else
					if (pos == 0 && c == ' ')
						continue;
		if (pos >= LINESIZE - 1 || !(isprint(c) || c == ' '))
			putchar(CTRL('G'));
		else {
			if (islower(c))
				c = toupper(c);
			linebuf[pos++] = c;
			addstr(unctrl(c));
			Mpos++;
		}
	}
	linebuf[pos] = '\0';
	stdscr = oscr;
	return (linebuf);
}

/* s: chars allowed besides space or return */
void
xwaitforspace(char *s)
{
	int c;

	morc = 0;

	while((c = readchar()) != '\n') {
	    if(flags.cbreak) {
		if(c == ' ') break;
		if(s && strchr(s,c)) {
			morc = c;
			break;
		}
		hackbell();
	    }
	}
}

char *
regname(int regnam)
{
	static char buf[64];
	char *p;
	int c;

	p = buf;
	*p++ = regnam;
	while (isalnum(c = readchar())) {
		if (p >= buf+sizeof(buf)-1)
			error("register name too long");
		*p++ = c;
	}
	*p = 0;
	reread();
	return (buf);
}

static int findNonWs(FILETYPE f)
{
  int c, cont = 1;
  while (cont) {
    switch ((c = readchar(f))) {
    case 0:
      c = RETURN_CODE_EOF;
      break;
    case -1:
      c = RETURN_CODE_ERROR;
      break;
    default: ;
    }
    if (!isspace(c))
      break;
  }
  return c;
}

static int newton_init(int fd, unsigned long *id, unsigned long *extra)
{
	int i;
	unsigned char c;
	unsigned char response[35] = {
		0x16, 0x10, 0x02, 0x64, 0x5f, 0x69, 0x64, 0x00,
		0x00, 0x00, 0x0c, 0x6b, 0x79, 0x62, 0x64, 0x61,
		0x70, 0x70, 0x6c, 0x00, 0x00, 0x00, 0x01, 0x6e,
		0x6f, 0x66, 0x6d, 0x00, 0x00, 0x00, 0x00, 0x10,
		0x03, 0xdd, 0xe7
	};

	for (i = 0; i < sizeof(response); i++)
		if (readchar(fd, &c, 400) || c != response[i])
			return -1;

	return 0;
}

/*
 * get_bool:
 *	Allow changing a boolean option and print it out
 */
int
get_bool(void *vp, WINDOW *win)
{
    bool *bp = (bool *) vp;
    int oy, ox;
    bool op_bad;

    op_bad = TRUE;
    getyx(win, oy, ox);
    waddstr(win, *bp ? "True" : "False");
    while (op_bad)	
    {
	wmove(win, oy, ox);
	wrefresh(win);
	switch (readchar())
	{
	    case 't':
	    case 'T':
		*bp = TRUE;
		op_bad = FALSE;
		break;
	    case 'f':
	    case 'F':
		*bp = FALSE;
		op_bad = FALSE;
		break;
	    case '\n':
	    case '\r':
		op_bad = FALSE;
		break;
	    case ESCAPE:
		return QUIT;
	    case '-':
		return MINUS;
	    default:
		wmove(win, oy, ox + 10);
		waddstr(win, "(T or F)");
	}
    }
    wmove(win, oy, ox);
    waddstr(win, *bp ? "True" : "False");
    waddch(win, '\n');
    return NORM;
}

int
get_bool(void *vp, WINDOW *win)
{
    int *bp = (int *) vp;
    int oy, ox;
    int op_bad;

    op_bad = TRUE;
    getyx(win, oy, ox);
    waddstr(win, *bp ? "True" : "False");
    while(op_bad)	
    {
	wmove(win, oy, ox);
	draw(win);
	switch (readchar(win))
	{
	    case 't':
	    case 'T':
		*bp = TRUE;
		op_bad = FALSE;
		break;
	    case 'f':
	    case 'F':
		*bp = FALSE;
		op_bad = FALSE;
		break;
	    case '\n':
	    case '\r':
		op_bad = FALSE;
		break;
	    case '\033':
	    case '\007':
		return QUIT;
	    case '-':
		return MINUS;
	    default:
		mvwaddstr(win, oy, ox + 10, "(T or F)");
	}
    }
    wmove(win, oy, ox);
    waddstr(win, *bp ? "True" : "False");
    waddch(win, '\n');
    return NORM;
}

int
getchar(void)
{
	char ch;
	int len;

	ch = readchar(); // read(STDIN_FILENO, &ch, 1);
	// if (len<=0) {
		// /* end of file or error */
		// return EOF;
	// }

	/*
	 * Cast through unsigned char, to prevent sign extension. This
	 * sends back values on the range 0-255, rather than -128 to 127,
	 * so EOF can be distinguished from legal input.
	 */
	return (int)(unsigned char)ch;
}

int sal_readchar(const char *prompt)
{
#ifdef INCLUDE_EDITLINE
    extern int readchar(const char *prompt);
#else
    char	buf[64];
#endif

#ifdef INCLUDE_EDITLINE
    return(readchar(prompt));
#else
    printk("%s", prompt);
    if (NULL == (sal_console_gets(buf, sizeof(buf)))) {
	return(EOF);
    } else {
	return(buf[0]);
    }
#endif
}

int block_continueread(FILETYPE f, int brace_count, char *data, int size,
		       char spacer)
{
  char c;
  int i;

  if (!data || !size)
    return RETURN_CODE_ERROR;

  data[0] = 0;

  if (brace_count == 0)
    return 0;

  /* scan block data until brace_count = 0 or space eaten up */
  i = 0;
  while (i < size - 1) {
    if ((c = readchar(f)) <= 0) {
      data[i] = 0;
      return RETURN_CODE_ERROR;
    }
 
    if (c == '{') brace_count++;
    if (c == '}') {
      if (--brace_count == 0) {
	/* read complete block, strip trailing whitespaces */
	while (i > 1 && isspace(data[i - 1]))
	  i--;
	data[i] = 0;
	return 0;
      }
    }
    if (c == spacer && brace_count == 1) {
      data[i] = 0;
      return brace_count;
    }
    data[i++] = c;
  }
  data[i] = 0;

  return brace_count;
}

static int generic_led(unsigned int l)
{
	char c;
	CSR_GPIO_OUT = l;
	printf("Is the LED on? (y/n/s)\n");
	while(1) {
		c = readchar();
		switch(c) {
			case 'y':
				CSR_GPIO_OUT = 0;
				return TEST_STATUS_PASSED;
			case 'n':
				CSR_GPIO_OUT = 0;
				return TEST_STATUS_FAILED;
			case 's':
				CSR_GPIO_OUT = 0;
				return TEST_STATUS_NOT_DONE;
		}
	}
}

int dump_init(int fd, long *id, long *extra)
{
	unsigned char c, o = 0;

	c = 0x80;

	if (write(fd, &c, 1) != 1)         /* Enable command */
                return -1;

	while (1)
		if (!readchar(fd, &c, 1)) {
			printf("%02x (%c) ", c, ((c > 32) && (c < 127)) ? c : 'x');
			o = 1;
		} else {
			if (o) {
				printf("\n");
				o = 0;
			}
		}
}

void
inventory(struct linked_list *container, int type)
{
    int cnt;

    if (type == 0)
    {
        msg("What kind of item <%s> to inventory (* for all)?",  type_list);

        type = readchar();

        if (type == ESCAPE)
        {
            after = FALSE;
            msg("");
            return;
        }
    }

    /*
     * Get a list of items to print out. If the user selects '*', list
     * them all.
     */

    if (type == '*')
        type = 0;   /* no type passed ->use them all */

    mpos = 0;

    if ((cnt = count_bag(container, type, NULL)) == 0)
        msg("You don't have any %s.", name_type(type));
    else
    {
        apply_to_bag(container, type, NULL, baf_print_item, &type);
        end_line();
        msg("");
    }

    return;
}

int
main(void)
{
	int c;
	bool leading = true;

	while ((c = readchar()) != EOF) {
		if (isspace(c))
			/* Save whitespace. */
			savewhite(c, leading);
		else {
			/* Reprint whitespace and print regular character. */
			printwhite();
			writechar(c);
			leading = false;
		}
	}
	/* Terminate non-empty files with a newline. */
	if (!leading)
		writechar('\n');
	return (0);
}

static int test_user_abort()
{
	char c;

	puts("I: Press Q or ESC to abort boot");
	CSR_TIMER0_COUNTER = 0;
	CSR_TIMER0_COMPARE = 2*brd_desc->clk_frequency;
	CSR_TIMER0_CONTROL = TIMER_ENABLE;
	while(CSR_TIMER0_CONTROL & TIMER_ENABLE) {
		if(readchar_nonblock()) {
			c = readchar();
			if((c == 'Q')||(c == '\e')) {
				puts("I: Aborted boot on user request");
				vga_set_console(1);
				return 0;
			}
			if(c == 0x07) {
				vga_set_console(1);
				netboot();
				return 0;
			}
		}
	}