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kernel
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* minor size optimizations in chario.c, dosfns.c; 

asmsupt.asm: correct fmemchr (all n's) and *memset/*memcpy (n==0)


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@590 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2003-06-15 14:21:49 +00:00
parent 439cc495e4
commit 5210965831
3 changed files with 27 additions and 25 deletions
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8
kernel/asmsupt.asm
View File

@ -119,6 +119,7 @@ domemcpy:
; And do the built-in byte copy, but do a 16-bit transfer ; And do the built-in byte copy, but do a 16-bit transfer
; whenever possible. ; whenever possible.
shr cx,1 shr cx,1
jcxz memcpy_return
rep movsw rep movsw
jnc memcpy_return jnc memcpy_return
movsb movsb
@ -180,9 +181,10 @@ FMEMSET:
mov bl,8 mov bl,8
domemset: domemset:
mov ah, al mov ah, al
shr cx,1 shr cx,1
jcxz pascal_return
rep stosw rep stosw
jnc pascal_return jnc pascal_return
stosb stosb
@ -391,11 +393,11 @@ FMEMCHR:
mov bl, 8 mov bl, 8
jcxz strchr_retzero
repne scasb repne scasb
jne strchr_retzero jne strchr_retzero
mov dx, es mov dx, es
mov ax, di mov ax, di
dec ax
jmp short strchr_found1 jmp short strchr_found1
;********************************************************************** ;**********************************************************************

12
kernel/chario.c
View File

@ -218,6 +218,7 @@ STATIC int raw_put_char(int sft_idx, int c)
STATIC int cooked_put_char(int sft_idx, int c) STATIC int cooked_put_char(int sft_idx, int c)
{ {
int err = 0; int err = 0;
unsigned char scrpos = scr_pos;
/* Test for hold char */ /* Test for hold char */
con_hold(sft_idx); con_hold(sft_idx);
@ -225,23 +226,24 @@ STATIC int cooked_put_char(int sft_idx, int c)
switch (c) switch (c)
{ {
case CR: case CR:
scr_pos = 0; scrpos = 0;
break; break;
case LF: case LF:
case BELL: case BELL:
break; break;
case BS: case BS:
if (scr_pos > 0) if (scrpos > 0)
scr_pos--; scrpos--;
break; break;
case HT: case HT:
do do
err = raw_put_char(sft_idx, ' '); err = raw_put_char(sft_idx, ' ');
while (err >= 0 && ((++scr_pos) & 7)); while (err >= 0 && ((++scrpos) & 7));
break; break;
default: default:
scr_pos++; scrpos++;
} }
scr_pos = scrpos;
if (c != HT) if (c != HT)
err = raw_put_char(sft_idx, c); err = raw_put_char(sft_idx, c);
return err; return err;

30
kernel/dosfns.c
View File

@ -239,23 +239,25 @@ long DosRWSft(int sft_idx, size_t n, void FAR * bp, int mode)
{ {
size_t cnt = (size_t)rc; size_t cnt = (size_t)rc;
const char FAR *p = bp; const char FAR *p = bp;
unsigned char scrpos = scr_pos;
while (cnt--) while (cnt--)
{ {
switch (*p++) switch (*p++)
{ {
case CR: case CR:
scr_pos = 0; scrpos = 0;
break; break;
case LF: case LF:
case BELL: case BELL:
break; break;
case BS: case BS:
--scr_pos; --scrpos;
break; break;
default: default:
++scr_pos; ++scrpos;
} }
} }
scr_pos = scrpos;
} }
return rc; return rc;
} }
@ -398,14 +400,9 @@ ULONG DosSeek(unsigned hndl, LONG new_pos, COUNT mode)
STATIC long get_free_hndl(void) STATIC long get_free_hndl(void)
{ {
psp FAR *p = MK_FP(cu_psp, 0); psp FAR *p = MK_FP(cu_psp, 0);
unsigned hndl; UBYTE FAR *q = p->ps_filetab;
UBYTE FAR *r = fmemchr(q, 0xff, p->ps_maxfiles);
for (hndl = 0; hndl < p->ps_maxfiles; hndl++) return FP_OFF(r) == 0 ? DE_TOOMANY : r - q;
{
if (p->ps_filetab[hndl] == 0xff)
return hndl;
}
return DE_TOOMANY;
} }
STATIC sft FAR *get_free_sft(COUNT * sft_idx) STATIC sft FAR *get_free_sft(COUNT * sft_idx)
@ -442,18 +439,19 @@ STATIC sft FAR *get_free_sft(COUNT * sft_idx)
const char FAR *get_root(const char FAR * fname) const char FAR *get_root(const char FAR * fname)
{ {
/* find the end */ /* find the end */
register unsigned length = fstrlen(fname) - 1; register unsigned length = fstrlen(fname);
char c; char c;
/* now back up to first path seperator or start */ /* now back up to first path seperator or start */
while (length != (unsigned)-1) fname += length;
while (length)
{ {
c = fname[length]; length--;
c = *--fname;
if (c == '/' || c == '\\' || c == ':') if (c == '/' || c == '\\' || c == ':')
break; break;
--length;
} }
return fname + length + 1; return fname;
} }
/* initialize SFT fields (for open/creat) for character devices */ /* initialize SFT fields (for open/creat) for character devices */