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lineedit: hack for making it sort-of-work even if term width is wrong

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function                                             old     new   delta
read_line_input                                     3158    3153      -5
input_end                                             29      24      -5
input_delete                                         115     110      -5
input_forward                                         27      20      -7
cmdedit_set_out_char                                  88      80      -8
This commit is contained in:
Denis Vlasenko 2008-04-25 18:44:35 +00:00
parent 44f0821259
commit 2c84495184
1 changed files with 19 additions and 0 deletions
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19
libbb/lineedit.c
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@ -166,10 +166,17 @@ static void deinit_S(void)
}
#define DEINIT_S() deinit_S()
/* Put 'command_ps[cursor]', cursor++.
* Advance cursor on screen. If we reached right margin, scroll text up
* and remove terminal margin effect by printing 'next_char' */
#define HACK_FOR_WRONG_WIDTH 1
#if HACK_FOR_WRONG_WIDTH
static void cmdedit_set_out_char(void)
#define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
#else
static void cmdedit_set_out_char(int next_char)
#endif
{
int c = (unsigned char)command_ps[cursor];
@ -196,9 +203,21 @@ static void cmdedit_set_out_char(int next_char)
/* terminal is scrolled down */
cmdedit_y++;
cmdedit_x = 0;
#if HACK_FOR_WRONG_WIDTH
/* This works better if our idea of term width is wrong
* and it is actually wider (often happens on serial lines).
* Printing CR,LF *forces* cursor to next line.
* OTOH if terminal width is correct AND terminal does NOT
* have automargin (IOW: it is moving cursor to next line
* by itself (which is wrong for VT-10x terminals)),
* this will break things: there will be one extra empty line */
puts("\r"); /* + implicit '\n' */
#else
/* Works ok only if cmdedit_termw is correct */
/* destroy "(auto)margin" */
bb_putchar(next_char);
bb_putchar('\b');
#endif
}
// Huh? What if command_ps[cursor] == '\0' (we are at the end already?)
cursor++;