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Functioning readline()

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This commit is contained in:
Michael Brown 2006-12-19 23:25:44 +00:00
parent 66007fa448
commit 22289ca8f6
1 changed files with 47 additions and 2 deletions
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49
src/hci/readline.c
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@ -30,6 +30,44 @@
#define READLINE_MAX 256
/**
* Synchronise console with edited string
*
* @v string Editable string
*/
static void sync_console ( struct edit_string *string ) {
unsigned int mod_start = string->mod_start;
unsigned int mod_end = string->mod_end;
unsigned int cursor = string->last_cursor;
size_t len = strlen ( string->buf );
/* Expand region back to old cursor position if applicable */
if ( mod_start > string->last_cursor )
mod_start = string->last_cursor;
/* Expand region forward to new cursor position if applicable */
if ( mod_end < string->cursor )
mod_end = string->cursor;
/* Backspace to start of region */
while ( cursor > mod_start ) {
putchar ( '\b' );
cursor--;
}
/* Print modified region */
while ( cursor < mod_end ) {
putchar ( ( cursor >= len ) ? ' ' : string->buf[cursor] );
cursor++;
}
/* Backspace to new cursor position */
while ( cursor > string->cursor ) {
putchar ( '\b' );
cursor--;
}
}
/**
* Read line from console
*
@ -47,6 +85,7 @@ char * readline ( const char *prompt ) {
.cursor = 0,
};
int key;
char *line = NULL;
if ( prompt )
printf ( "%s", prompt );
@ -54,15 +93,21 @@ char * readline ( const char *prompt ) {
buf[0] = '\0';
while ( 1 ) {
key = edit_string ( &string, getchar() );
sync_console ( &string );
switch ( key ) {
case 0x0d: /* Carriage return */
case 0x0a: /* Line feed */
return ( strdup ( buf ) );
line = strdup ( buf );
goto out;
case 0x03: /* Ctrl-C */
return NULL;
goto out;
default:
/* Do nothing */
break;
}
}
out:
putchar ( '\n' );
return line;
}