; File: ; asmsupt.asm ; Description: ; Assembly support routines for miscellaneous functions ; ; Copyright (c) 1995, 1998 ; Pasquale J. Villani ; All Rights Reserved ; ; This file is part of DOS-C. ; ; DOS-C is free software; you can redistribute it and/or ; modify it under the terms of the GNU General Public License ; as published by the Free Software Foundation; either version ; 2, or (at your option) any later version. ; ; DOS-C is distributed in the hope that it will be useful, but ; WITHOUT ANY WARRANTY; without even the implied warranty of ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See ; the GNU General Public License for more details. ; ; You should have received a copy of the GNU General Public ; License along with DOS-C; see the file COPYING. If not, ; write to the Free Software Foundation, 675 Mass Ave, ; Cambridge, MA 02139, USA. ; ; version 1.4 by tom.ehlert@ginko.de ; added some more functions ; changed bcopy, scopy, sncopy,... ; to memcpy, strcpy, strncpy ; Bart Oldeman: optimized a bit: see /usr/include/bits/string.h from ; glibc 2.2 ; ; $Id$ ; %include "segs.inc" %ifdef _INIT segment INIT_TEXT %define FMEMCPYBACK INIT_FMEMCPYBACK %define MEMCPY INIT_MEMCPY %define FMEMCPY INIT_FMEMCPY %define MEMSET INIT_MEMSET %define FMEMSET INIT_FMEMSET %define STRCPY INIT_STRCPY %define FSTRCPY INIT_FSTRCPY %define STRLEN INIT_STRLEN %define FSTRLEN INIT_FSTRLEN %define FMEMCHR INIT_FMEMCHR %define FSTRCHR INIT_FSTRCHR %define STRCHR INIT_STRCHR %define FSTRCMP INIT_FSTRCMP %define STRCMP INIT_STRCMP %define FSTRNCMP INIT_FSTRNCMP %define STRNCMP INIT_STRNCMP %define FMEMCMP INIT_FMEMCMP %define MEMCMP INIT_MEMCMP %else segment HMA_TEXT %endif ;********************************************************************* ; this implements some of the common string handling functions ; ; every function has 1 entry ; ; NEAR FUNC() ; ; currently done: ; ; fmemcpyBack(void FAR *dest, void FAR *src, int count) ; memcpy(void *dest, void *src, int count) ; fmemcpy(void FAR *dest, void FAR *src, int count) ; memset(void *dest, int ch, int count); ; fmemset(void FAR *dest, int ch, int count); ; strcpy (void *dest, void *src); ; fstrcpy (void FAR*dest, void FAR *src); ; strlen (void *dest); ; fstrlen (void FAR*dest); ; fmemchr (BYTE FAR *src , int ch); ; fstrchr (BYTE FAR *src , int ch); ; strchr (BYTE *src , int ch); ; fstrcmp (BYTE FAR *s1 , BYTE FAR *s2); ; strcmp (BYTE *s1 , BYTE *s2); ; fstrncmp(BYTE FAR *s1 , BYTE FAR *s2, int count); ; strncmp(BYTE *s1 , BYTE *s2, int count); ; fmemcmp(BYTE FAR *s1 , BYTE FAR *s2, int count); ; memcmp(BYTE *s1 , BYTE *s2, int count); ;*********************************************** ; pascal_setup - set up the standard calling frame for C-functions ; and save registers needed later ; also preload the args for the near functions ; di=arg1 ; si=arg2 ; cx=arg3 ; pascal_setup: pop ax ; get return address push bp ; Standard C entry mov bp,sp %ifdef WATCOM push bx push cx push es %endif push si push di push ds ; Set both ds and es to same segment (for near copy) push ds pop es ; Set direction to autoincrement cld mov bl,6 ; majority (4) wants that mov cx,[4+bp] ; majority (8) wants that (near and far) mov si,[6+bp] ; majority (3) wants that (near) mov di,[8+bp] ; majority (3) wants that (near) jmp ax ;*********************************************** ; ; VOID memcpy(REG BYTE *s, REG BYTE *d, REG COUNT n); ; global MEMCPY MEMCPY: call pascal_setup ;mov cx,[4+bp] - preset above ;mov si,[6+bp] - preset above ;mov di,[8+bp] - preset above ;mov bl,6 - preset above domemcpy: ; And do the built-in byte copy, but do a 16-bit transfer ; whenever possible. shr cx,1 rep movsw jnc memcpy_return movsb memcpy_return: %if 0 ; only needed for fmemcpyback cld %endif ; ; pascal_return - pop saved registers and do return ; jmp short pascal_return ;************************************************************ ; ; VOID fmemcpy(REG BYTE FAR *d, REG BYTE FAR *s,REG COUNT n); ; VOID fmemcpyBack(REG BYTE FAR *d, REG BYTE FAR *s,REG COUNT n); ; global FMEMCPY %if 0 global FMEMCPYBACK FMEMCPYBACK: std ; force to copy the string in reverse order %endif FMEMCPY: call pascal_setup ; Get the repetition count, n preset above ; mov cx,[bp+4] ; Get the far source pointer, s lds si,[bp+6] ; Get the far destination pointer d les di,[bp+10] mov bl,10 jmp short domemcpy ;*************************************************************** ; ; VOID fmemset(REG VOID FAR *d, REG BYTE ch, REG COUNT n); ; global FMEMSET FMEMSET: call pascal_setup ; Get the repetition count, n - preset above ; mov cx,[bp+4] ; Get the fill byte ch mov ax,[bp+6] ; Get the far source pointer, s les di,[bp+8] mov bl,8 domemset: mov ah, al shr cx,1 rep stosw jnc pascal_return stosb jmp short pascal_return ;*************************************************************** ; ; VOID memset(REG VOID *d, REG BYTE ch, REG COUNT n); ; global MEMSET MEMSET: call pascal_setup ; Get the repitition count, n - preset above ; mov cx,[bp+4] ; Get the char ch mov ax, [bp+6] ; Get the far source pointer, d - preset above ; mov di,[bp+8] ;mov bl, 6 ; preset above jmp short domemset ;***** pascal_return: lds di, [bp] ; return address in ds, saved bp in di mov bh, 0 add bp, bx ; point bp to "as if there were 0 args" mov [bp+2], ds ; put return address at first arg mov [bp], di ; saved bp below that one pop ds pop di pop si %ifdef WATCOM pop es pop cx pop bx %endif mov sp,bp pop bp ret ;***************************************************************** ; fstrcpy (void FAR*dest, void FAR *src); %ifndef _INIT global FSTRCPY FSTRCPY: call pascal_setup ; Get the source pointer, ss lds si,[bp+4] ; and the destination pointer, d les di,[bp+8] mov bl,8 jmp short dostrcpy %endif ;****** global STRCPY STRCPY: call pascal_setup ; Get the source pointer, ss mov si,[bp+4] ; and the destination pointer, d mov di,[bp+6] mov bl,4 dostrcpy: strcpy_loop: lodsb stosb test al,al jne strcpy_loop jmp short pascal_return ;****************************************************************** %ifndef _INIT global FSTRLEN FSTRLEN: call pascal_setup ; Get the source pointer, ss les di,[bp+4] mov bl,4 jmp short dostrlen %endif ;********************************************** global STRLEN STRLEN: call pascal_setup ; Get the source pointer, ss mov di,[bp+4] mov bl,2 dostrlen: mov al,0 mov cx,0xffff repne scasb mov ax,cx not ax dec ax jmp short pascal_return ;************************************************************ ; strchr (BYTE *src , int ch); global STRCHR STRCHR: call pascal_setup ; Get the source pointer, ss ; mov cx,[bp+4] - preset above ; mov si,[bp+6] - preset above mov bl,4 strchr_loop: lodsb cmp al,cl je strchr_found test al,al jne strchr_loop strchr_retzero: xor ax, ax ; return NULL if not found mov dx, ax ; for fstrchr() jmp short pascal_return strchr_found: mov ax, si mov dx, ds ; for fstrchr() strchr_found1: dec ax jmp short pascal_return %ifndef _INIT ;***** ; fstrchr (BYTE far *src , int ch); global FSTRCHR FSTRCHR: call pascal_setup ; Get ch (preset above) ;mov cx, [bp+4] ;and the source pointer, src lds si, [bp+6] ;mov bl, 6 - preset above jmp short strchr_loop ;****** global FMEMCHR FMEMCHR: call pascal_setup ; Get the length - preset above ; mov cx, [bp+4] ; and the search value mov ax, [bp+6] ; and the source pointer, ss les di, [bp+8] mov bl, 8 jcxz strchr_retzero repne scasb jne strchr_retzero mov dx, es mov ax, di jmp short strchr_found1 %endif ;********************************************************************** %if 0 nix pascal - still untested global _fstrcmp _fstrcmp: call pascal_setup ; Get the source pointer, ss lds si,[bp+4] ; and the destination pointer, d les di,[bp+8] jmp short dostrcmp ;****** global _strcmp _strcmp: call pascal_setup ; Get the source pointer, ss ; mov si,[bp+4] ; and the destination pointer, d ; mov di,[bp+6] xchg si,di dostrcmp: ; replace strncmp(s1,s2)--> ; strncmp(s1,s2,0xffff) mov cx,0xffff jmp short dostrncmp ;********************************************************************** global FSTRNCMP FSTRNCMP: call pascal_setup ; Get the source pointer, ss lds si,[bp+4] ; and the destination pointer, d les di,[bp+8] mov cx,[bp+12] jmp short dostrncmp ;****** global _strncmp _strncmp: call pascal_setup ; Get the source pointer, ss ;mov si,[bp+4] ; and the destination pointer, d ;mov di,[bp+6] ;mov cx,[bp+8] xchg si,di dostrncmp: jcxz strncmp_retzero strncmp_loop: lodsb scasb jne strncmp_done test al,al loopne strncmp_loop jmp short strncmp_retzero %endif ;********************************************************************** ; fmemcmp(BYTE FAR *s1 , BYTE FAR *s2, int count); global FMEMCMP FMEMCMP: call pascal_setup ; the length - preset above ; mov cx, [bp+4] ; Get the source pointer, ss les di,[bp+6] ; and the destination pointer, d lds si,[bp+10] mov bl,10 jmp short domemcmp ;****** ; memcmp(BYTE *s1 , BYTE *s2, int count); global MEMCMP MEMCMP: call pascal_setup ; all preset: Get the source pointer, ss ;mov si,[bp+6] ; and the destination pointer, d ;mov di,[bp+8] ;mov cx,[bp+4] ;mov bl,6 xchg si,di domemcmp: jcxz strncmp_retzero repe cmpsb jne strncmp_done strncmp_retzero: xor ax, ax jmp short strncmp_done2 strncmp_done: lahf ror ah,1 strncmp_done2: jmp pascal_return