| 122,15 → 122,23 |
|---|
| /* scan memory for rmod, returns its segment if found, 0xffff otherwise */ |
| unsigned short rmod_find(void) { |
| unsigned short i; |
| unsigned short far *pattern; |
| unsigned short far *ptrword; |
| unsigned char far *ptrbyte; |
| |
| /* iterate over all paragraphs, looking for my signature */ |
| for (i = 0; i != 65535; i++) { |
| pattern = MK_FP(i, 0); |
| if (pattern[0] != 0x1983) continue; |
| if (pattern[1] != 0x1985) continue; |
| if (pattern[2] != 0x2017) continue; |
| if (pattern[3] != 0x2019) continue; |
| for (i = 1; i != 65535; i++) { |
| ptrword = MK_FP(i, 0); |
| if (ptrword[0] != 0x1983) continue; |
| if (ptrword[1] != 0x1985) continue; |
| if (ptrword[2] != 0x2017) continue; |
| if (ptrword[3] != 0x2019) continue; |
| /* extra check: make sure the paragraph before is an MCB block and that it |
| * belongs to itself. otherwise I could find the rmod code embedded inside |
| * the command.com binary... */ |
| ptrbyte = MK_FP(i - 1, 0); |
| if ((*ptrbyte != 'M') && (*ptrbyte != 'Z')) continue; /* not an MCB */ |
| ptrword = MK_FP(i - 1, 1); |
| if (*ptrword != i) continue; /* not belonging to self */ |
| return(i); |
| } |
| return(0xffff); |