FWIW, in my programs (written in ASM) what I do while parsing the command line is look at the length stored at PSP:80h. If it is less than 126, I use the data stored at PSP:81h up to the first 0Dh (Carriage Return) character. If the length is 126 or more, I look for the CMDLINE environment variable and use it (if it exists). If I can't find a CMDLINE environment variable, I go back and use what is stored at PSP:81h up to the first 0Dh character. I never actually use (or trust) the value stored at PSP:80h to provide the actual length, but simply use it as a flag to tell me whether or not I should bother looking for a CMDLINE environment variable.
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