Flash name of exe com file that is being opened in write mode - Terminate but Stay Resident (TSR) Source Code in C

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Home » C Home » Terminate but Stay Resident (TSR) Home » Flash name of exe com file that is being opened in write mode

A D V E R T I S E M E N T

Title	Flash name of exe com file that is being opened in write mode
Author	Nitin
Author Email	nitin14312003 [at] yahoo.com
Description	this tsr specify names of exe files which are opened in write mode. try this beautiful program
Category	C » Terminate but Stay Resident (TSR)
Hits	383236
Code	Select and Copy the Code
// flash name of exe com file that is being opened in write mode #pragma inline #include <dos.h> #include<bios.h> void interrupt(old_21)(); void interrupt new_21(unsigned BP_21, unsigned DI_21, unsigned SI_21, unsigned DS_21, unsigned ES_21, unsigned DX_21, unsigned CX_21, unsigned BX_21, unsigned AX_21, unsigned IP_21, unsigned CS_21, unsigned flags_21); char far scr = (char far )0xb8000000; int k = 2000, i = 0,j; char filename[50], ch, op[50], ptr = "open is"; char far fname; void main() { old_21 = getvect(0x21); setvect(0x21, new_21); keep(0, 1000); } void interrupt new_21(unsigned BP_21, unsigned DI_21, unsigned SI_21, unsigned DS_21, unsigned ES_21, unsigned DX_21, unsigned CX_21, unsigned BX_21, unsigned AX_21, unsigned IP_21, unsigned CS_21, unsigned flags_21) { if(_AH == 0x4b) { fname = MK_FP(DS_21, DX_21); i = 0; while(fname) { ch = fname; op[i] = ch; fname++; i++; } op[i] = 0; } if(_AH == 0x3d \|\| _AH == 0x3c) { fname = MK_FP(DS_21, DX_21); i = 0; while(fname) { ch = fname; filename[i] = ch; fname++; i++; } filename[i] = 0; strupr(filename); i = 0; while(filename[i] != '.' && filename[i]) { i++; } if((!strcmp(&filename[i+1], "EXE")) \|\| (!strcmp(&filename[i+1], "SYS")) \|\| (!strcmp(&filename[i+1], "COM"))) { //(scr + 1000) = 'P'; // scr = ptr; if(AX_21 & 3) { //fwrite(39, 1, 1, "file opened is:- "); // fwrite(58, 1, 1, " "); //fwrite(58, 1, 1, op); //printf("%sname is",op); for(j = 0; op[j]; j++) { (scr + k + j 2) = op[j]; } k = k + j * 2 + 8; for(j = 0; filename[j]; j++) { (scr + k + j 2) = filename[j]; } k = k + j * 2; while((ch = bioskey(0)) != 'y' && ch != 'n') if(ch == 'n') { asm stc; asm pushf; asm pop flags_21; return; } } } } asm pop bp; asm pop di; asm pop si; asm pop ds; asm pop es; asm pop dx; asm pop cx; asm pop bx; asm pop ax; asm jmp cs:_old_21; }

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