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vi: reduce amount of memset'ing on each screen refresh

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This commit is contained in:
Denis Vlasenko 2007-12-22 17:31:29 +00:00
parent e3cbfb91d2
commit 4baed3a080
1 changed files with 13 additions and 9 deletions
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22
editors/vi.c
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@ -2516,9 +2516,9 @@ static void place_cursor(int row, int col, int optimize)
}
skip: ;
}
last_row = row;
#endif /* FEATURE_VI_OPTIMIZE_CURSOR */
write1(cm);
last_row = row;
}
//----- Erase from cursor to end of line -----------------------
@ -2762,10 +2762,9 @@ static char* format_line(char *src, int li)
int ofs = offset;
char *dest = scr_out_buf; // [MAX_SCR_COLS + MAX_TABSTOP * 2]
memset(dest, ' ', MAX_SCR_COLS + MAX_TABSTOP * 2);
c = '~'; // char in col 0 in non-existent lines is '~'
for (co = 0; co < columns + MAX_TABSTOP; co++) {
co = 0;
while (co < columns + tabstop) {
// have we gone past the end?
if (src < end) {
c = *src++;
@ -2790,11 +2789,11 @@ static char* format_line(char *src, int li)
}
}
}
dest[co] = c;
dest[co++] = c;
// discard scrolled-off-to-the-left portion,
// in tabstop-sized pieces
if (ofs >= tabstop && co >= tabstop) {
memmove(dest, dest + tabstop, co + 1);
memmove(dest, dest + tabstop, co);
co -= tabstop;
ofs -= tabstop;
}
@ -2803,9 +2802,14 @@ static char* format_line(char *src, int li)
}
// check "short line, gigantic offset" case
if (co < ofs)
ofs = co + 1;
dest[ofs + MAX_SCR_COLS] = '\0';
return &dest[ofs];
ofs = co;
// discard last scrolled off part
co -= ofs;
dest += ofs;
// fill the rest with spaces
if (co < columns)
memset(&dest[co], ' ', columns - co);
return dest;
}
//----- Refresh the changed screen lines -----------------------