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![Brian Palmer](/assets/img/avatar_default.png)
Added tool to fix Win2k/XP NTVDM bug so DJGPP works without crashing svn path=/trunk/; revision=2407
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* Copyright (C) 2000 CW Sandmann (sandmann@clio.rice.edu) 1206 Braelinn, Sugar Land, TX 77479 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#ifdef GO32
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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char view_only = 0;
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const char *client_patch_code;
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char buffer[20480];
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unsigned long search_base = 0x4c800L;
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int f;
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char oldpatch[] = {0x3b, 0x05, 0xac, 0xe6 };
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char newpatch[] = {0x3b, 0x05, 0x58, 0x5e };
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void patch_image(char *filename)
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{
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int i,size;
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view_only = 0;
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f = open(filename, O_RDWR | O_BINARY);
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if (f < 0) {
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f = open(filename, O_RDONLY | O_BINARY);
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if (f < 0) {
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perror(filename);
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return;
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}
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view_only = 1;
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}
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lseek(f, search_base, SEEK_SET);
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size = read(f, buffer, sizeof(buffer));
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client_patch_code = NULL;
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for(i=0; i<size && !client_patch_code; i++)
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if(!memcmp(buffer+i,oldpatch,sizeof(oldpatch)))
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client_patch_code = (buffer+i);
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if(!client_patch_code) {
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printf("Old patch string not found in %s!\n",filename);
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} else {
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lseek(f, search_base+i-1, SEEK_SET); /* Ready to update */
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if(!view_only) {
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write(f, newpatch, sizeof(newpatch));
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printf("%s patched\n",filename);
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} else
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printf("%s patchable (not changed, readonly)\n",filename);
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}
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close(f);
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return;
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}
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int main(int argc, char **argv)
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{
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int i;
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char filename[256];
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char buf1[256];
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char file2[256];
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if (argc != 1) { /* If they specify names, patch them, exit */
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for(i=1; i<argc; i++)
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patch_image(argv[i]);
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return 0;
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}
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fprintf(stderr, "This image patches Windows 2000 NTVDM to fix nesting DPMI bug.\n");
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strcpy(filename,getenv("SYSTEMROOT"));
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strcpy(file2,filename);
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strcat(filename,"\\system32\\ntvdm.exe");
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strcat(file2,"\\system32\\dllcache\\ntvdm.exe");
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sprintf(buf1,"copy %s %s\\system32\\ntvdm.ori",filename,getenv("SYSTEMROOT"));
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printf("%s\n",buf1);
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system(buf1);
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patch_image(file2);
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patch_image(filename);
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return 0;
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}
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