Hi!
23-Июн-2006 17:22 [EMAIL PROTECTED] (Alain M.) wrote to
[email protected]:
AM> Before your program's first byte at CS:100h is executed, the rest of the
AM> command line (starting with the first argument) is paced at address
AM> CS:80h, zero terminated. That is all you get is using assembler. The
AM> argc[0] didn't work in old versions of DOS so it must be stored
AM> elsewhere and have a function to get it.
argv[0] (should) contain startup name or should be NULL. Starting from
MS-DOS 3.0, startup name with absolute path placed after original
environment. Strange, but own MS C compiler startup RTL places into argv[0]
not this value, but only executable name.
AM> It is not guaranteed (between
AM> all DOS flavours) that there will not be extra spaces at the beguining
They _will_ be, unless you join option with program name:
>pspdump /test
0080 06 20 2f 74 65 73 74 0d-00 00 00 00 00 00 00 00 . /test.........
>pspdump/test
0080 05 2f 74 65 73 74 0d 00-00 00 00 00 00 00 00 00 ./test..........
>pspdump /test
0080 07 20 20 2f 74 65 73 74-0d 00 00 00 00 00 00 00 . /test........
AM> in case the user puts more then one space after the program name. You
AM> see then some limitations: the line cannot be more then 127 bytes and
AM> "*" are not expanded.
This (non-expanded "*") isn't limitation! This is very useful feature,
because program itself decides what to do with this _character_, without
requirinq from user extra efforts to escape this character.
About command line limitation: NDOS/4DOS and newer command.com place
complete, untruncated command line into CMDLINE environemnt variable.
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