On 11/19/2017 8:16 AM, Andreas K. Foerster wrote: > > Are there any documented limits for environment variables in DOS? > > My implementation uses a static buffer. So the content changes with > every call to getenv. This is explicitly allowed by the standard. > > I don't want to make the buffer too large though, since space > is so limited in small mode. Currently either the name or the content > may not be larger than 126 characters. If the name is longer, it is > not found. If the content is longer, it is truncated. Yes, there is a limit. By default, it's 128 bytes, which can be increased at the time of the start of command.com using the /L:xxxx parameter, with xxxx in a range of 128 to 1024. This space is inherited from the "master" each time you start a new command.com and any changes to the environment variables of the new command line are valid for that command line and do not alter the "master" environment unless you explicitly try to alter the memory where the "master" resides...
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