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#include <common.h>
#include <watchdog.h>
static char erase_seq[] = "\b \b"; /* erase sequence */
static char tab_seq[] = " "; /* used to expand TABs */
static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen)
{
char *s;
if (*np == 0) {
return (p);
}
if (*(--p) == '\t') { /* will retype the whole line */
while (*colp > plen) {
puts (erase_seq);
(*colp)--;
}
for (s=buffer; s<p; ++s) {
if (*s == '\t') {
puts (tab_seq+((*colp) & 07));
*colp += 8 - ((*colp) & 07);
} else {
++(*colp);
putchar (*s);
}
}
} else {
puts (erase_seq);
(*colp)--;
}
(*np)--;
return (p);
}
/*
* Prompt for input and read a line.
* If CONFIG_BOOT_RETRY_TIME is defined and retry_time >= 0,
* time out when time goes past endtime (timebase time in ticks).
* Return: number of read characters
* -1 if break
* -2 if timed out
*/
int readline (const char *prompt, char *line, int len)
{
char *p = line;
int n = 0; /* buffer index */
int plen = 0; /* prompt length */
int col; /* output column cnt */
char c;
/* print prompt */
if (prompt) {
plen = strlen (prompt);
puts (prompt);
}
col = plen;
for (;;) {
#ifdef CONFIG_BOOT_RETRY_TIME
while (!tstc()) { /* while no incoming data */
if (retry_time >= 0 && get_ticks() > endtime)
return (-2); /* timed out */
}
#endif
WATCHDOG_RESET(); /* Trigger watchdog, if needed */
#ifdef CONFIG_SHOW_ACTIVITY
while (!tstc()) {
extern void show_activity(int arg);
show_activity(0);
}
#endif
c = getc();
/*
* Special character handling
*/
switch (c) {
case '\r': /* Enter */
case '\n':
*p = '\0';
puts ("\r\n");
return (p - line);
case '\0': /* nul */
continue;
case 0x03: /* ^C - break */
line[0] = '\0'; /* discard input */
return (-1);
case 0x15: /* ^U - erase line */
while (col > plen) {
puts (erase_seq);
--col;
}
p = line;
n = 0;
continue;
case 0x17: /* ^W - erase word */
p=delete_char(line, p, &col, &n, plen);
while ((n > 0) && (*p != ' ')) {
p=delete_char(line, p, &col, &n, plen);
}
continue;
case 0x08: /* ^H - backspace */
case 0x7F: /* DEL - backspace */
p=delete_char(line, p, &col, &n, plen);
continue;
default:
/*
* Must be a normal character then
*/
if (n < CONFIG_CBSIZE-2) {
if (c == '\t') { /* expand TABs */
#ifdef CONFIG_AUTO_COMPLETE
/* if auto completion triggered just continue */
*p = '\0';
if (cmd_auto_complete(prompt, line, &n, &col)) {
p = line + n; /* reset */
continue;
}
#endif
puts (tab_seq+(col&07));
col += 8 - (col&07);
} else {
++col; /* echo input */
putchar (c);
}
*p++ = c;
++n;
} else { /* Buffer full */
putchar ('\a');
}
}
}
}
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