DOS ain't dead - Where is paramstr(0) hide ?

Where is paramstr(0) hide ? (Developers)

posted by tkchia , 26.12.2020, 07:22

Hello ecm,

> I believe it is at the end of the environment block, after the double-zero
> that marks the end of the variables stored in the block.

Indeed --- according to the all-knowing RBIL: :-D
Format of environment block: Offset Size Description (Table 01379) 00h N BYTEs first environment variable, ASCIZ string of form "var=value" N BYTEs second environment variable, ASCIZ string ... N BYTEs last environment variable, ASCIZ string of form "var=value" BYTE 00h ---DOS 3.0+ --- WORD number of strings following environment (normally 1) N BYTEs ASCIZ full pathname of program owning this environment other strings may follow
(This is under the entry for int 0x21, ah = 0x26.)

I wonder if there is a way to get the program name for DOS versions before 3.0.

Thank you!

---
https://gitlab.com/tkchia · https://codeberg.org/tkchia · 😴 "MOV AX,0D500H+CMOS_REG_D+NMI"

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Complete thread:

Where is paramstr(0) hide ? - DosWorld, 25.12.2020, 22:39 (Developers)
- Where is paramstr(0) hide ? - ecm, 25.12.2020, 22:51
  - Where is paramstr(0) hide ? - Laaca, 26.12.2020, 00:10
  - Where is paramstr(0) hide ? - tkchia, 26.12.2020, 07:22
  - Where is paramstr(0) hide ? - DosWorld, 29.12.2020, 00:41