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From: klamer@mi.eltn.utwente.nl (Klamer Schutte)
Newsgroups: comp.os.minix
Subject: 32 bits read/write on 16 bits kernel
Keywords: minix 68k, long integers
Message-ID: <klamer.671114249@mi.eltn.utwente.nl>
Date: 8 Apr 91 12:37:29 GMT
Sender: news@utrcu1.UUCP
Organization: University of Twente, BSC-El
Lines: 136

Here come two files, read.c and write.c to allow anyone who uses a
compiler with longer ints than the kernel compiler has to issue read(2)
and write(2) calls.

define INTIS32 if you want this. If you don't want this, you get the
minix-st 1.5.10#3 version.

Klamer


echo x - read.c
sed '/^X/s///' > read.c << '/'
X/*
X *	read.c
X *
X *	original: minix-st 1.5.10 #3
X *	changed for long ints KS 2/4/91
X */
X
X#include <lib.h>
X
X#define	IO_BLK	0x4000		/* smaller than 32k */
X
XPUBLIC int read(fd, buffer, nbytes)
Xint fd;
Xchar *buffer;
Xunsigned nbytes;
X{
X#ifdef INTIS32
X  int	ret_val, call_val;
X
X  for(ret_val = 0;nbytes > IO_BLK;nbytes -= IO_BLK)
X  {
X	call_val = callm1(FS, READ, fd, IO_BLK, 0, buffer, NIL_PTR, NIL_PTR);
X	ret_val += call_val;
X	if (call_val != IO_BLK)		/* whole request cannot be satisfied */
X		if (call_val >= 0)	/* is there an error? */
X			return ret_val;
X		else
X			return call_val;
X	buffer += call_val;
X  }
X	
X  return(ret_val + callm1(FS, READ, fd, nbytes, 0, buffer, NIL_PTR, NIL_PTR));
X#else
X  return(callm1(FS, READ, fd, nbytes, 0, buffer, NIL_PTR, NIL_PTR));
X#endif
X}
/
echo x - read.uue
sed '/^X/s///' > read.uue << '/'
Xtable
X !"#$%&'()*+,-./0123456789:;<=>?
X@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
Xbegin 644 read.c.Z
XM'YV-+U0H *$B@9PR8<BX&#-0(,$$;^2D.9/&31@V.D"TJ9@&3XLY=$#$<%'#z
XM10P8($;,:)A@#)HP;LZ4(0/"3$00;-[$!%&1SAP02Z: D/&"QHL<,1J^4*!@y
XM1,4Q;.J0*0."!YLT8ER@\<%TQ%0S%<LD2/+DBQ F2Q+ P$,#AML$"0*"F-/Fx
XM(ILR<D#0>>D&Q P9:P@N50"ERMDD0WBZ"7DP(0HS9%B $%/'C!F\DMV(R4.Gw
XMS)P4"GK6)+-#@<LP>550MHRW=!TW<R:ZF0E",V?/I?<T30.YC!D029Q023+Ev
XM[T#%= R6H?/%SD7)8^PVOUCZN$TY* XR=\X&1 \0,';8[OS3!_"R9Y>(WTP>u
XM1(OO9,VB!0T"A.Z6TKE[!Q&=#9LV,:!@Q!2225%$$$1(!IED\:4G&0R2K7:9t
XM')(YD0037T!!A1057ICAABF4IMQV%X&PPG?]L3$=&R+R!@(**:X(0@CPH3<?s
XM7'+=@<8;=X%P4!QU>!92=&ZX\49(8E U1QATI#$'6+2IL!1<+L*87XD^? =#r
XM"G&IP--/>^%%%4P@X"5'1#\(I@!<(]8A1U_:K2AB F6P,4<9:\*EG9M]Q<B=q
XMB!+B92**5[)X7!]K'K?GF]DM)^,*_-D%H( $@F @@@I&5AM[GCT88643=HBAp
XMAAR"8.&H((;85)UW*KH<GU;Z-^F !1Z8X&B9<3J'IY.!BIFI'I(JZH=2I*#Jo
X)"&6X009O"B *n
X m
Xend
/
echo x - write.c
sed '/^X/s///' > write.c << '/'
X/*
X *	write.c
X *
X *	original: minix-st 1.5.10 #3
X *	changed for long ints KS 2/4/91
X */
X
X#include <lib.h>
X
X#define	IO_BLK	0x4000		/* smaller than 32k */
X
XPUBLIC int write(fd, buffer, nbytes)
Xint fd;
Xchar *buffer;
Xunsigned nbytes;
X{
X#ifdef INTIS32
X  int	ret_val, call_val;
X
X  for(ret_val = 0;nbytes > IO_BLK;nbytes -= IO_BLK)
X  {
X	call_val = callm1(FS, WRITE, fd, IO_BLK, 0, buffer, NIL_PTR, NIL_PTR);
X	ret_val += call_val;
X	if (call_val != IO_BLK)		/* whole request cannot be satisfied */
X		if (call_val >= 0)	/* is there an error? */
X			return ret_val;
X		else
X			return call_val;
X	buffer += call_val;
X  }
X	
X  return(ret_val + callm1(FS, WRITE, fd, nbytes, 0, buffer, NIL_PTR, NIL_PTR));
X#else
X  return(callm1(FS, WRITE, fd, nbytes, 0, buffer, NIL_PTR, NIL_PTR));
X#endif
X}
/
echo x - write.uue
sed '/^X/s///' > write.uue << '/'
Xtable
X !"#$%&'()*+,-./0123456789:;<=>?
X@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
Xbegin 644 write.c.Z
XM'YV-+U0H *$BP1TY:>B4<3%FH$"""=X@/)/&31@V.D"TJ9@&3XLY=$#$<%'#z
XM10P8($;,<)A@#)HP;LZ4(0/"C$00;-[$!%&1SAP02Z: D/&"QHL<,1R^4*!@y
XM1,4Q;.J0*0."!YLT8ER@\<%TQ%0S%<LD2/+DBQ F2Q+ P$,#AML$"0*"F-/Fx
XM(ILR<D#0>>D&Q P9:P@N50"ERMDD0WBZ"7DP81D49LBP "&FCADS>">[$9-'w
XMX9P4"GK6)+-#@<LP>554OHRW=!TW<]*<<3,3Q.;.9>:4WM,T3>0R9D D<4(Ev
XMR92_ Q7322"G#)TO=BY.'F,7^L72R6W*0='\>70V('J @+'CMF<0/H27/;NDu
XM/.?S+<23-8L6- @0O%M6_QX>!'4V;+01 PI&3#'9%5(D0441DT4VV7SL30;#t
XM9*MA)L=D3B3!Q!=04"$%AAIRZ&$*I3'GG'7@K2#>?VR@6*)O(*# (HH@A"#?s
XM>O7!)=<=:+QQ%PC-Q5%';B%1YX8;;X0D!E5SA$%'&G. 59L*2\$%HXS[782>r
XM>#"D$)<*//VT%UY4P00"7G)(](-@"L!E(AUUR-%7=RZVF4 9;,Q1AIUOQMG7q
XMC-^56"%>(*CH7Y9LE'9?'VTFUYV?W)W(WPJ' B@@@0:"@*""#(ZFV7NY24BAp
XM91:"N&&''X*0X:DCDM@4GGHZZARD+%Y:X($)+MB@9+:!.H>HE)&:F:HAHFJJo
X.B%*DX.H(9;A!AF\*, H4n
X m
Xend
/
-- 
Klamer Schutte
Faculty of electrical engineering -- University of Twente, The Netherlands
klamer@mi.eltn.utwente.nl	{backbone}!mcsun!mi.eltn.utwente.nl!klamer