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Newsgroups: comp.os.msdos.djgpp
Date: Sat, 27 Jul 2013 23:11:39 -0700 (PDT)
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Subject: receiving of environment variables
From: Vasya Pupkin <tamarafedotova01 AT gmail DOT com>
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I try to receive the block of environment variables for executing program.
There is the simple code for this target:

void getenviron(char *envarea)
{
  unsigned long pspoffs, envoffs;
  char psparea[256 + 1];
  char *chpnt;
  __dpmi_regs myregs;

  myregs.x.ax = 0x6200;
  __dpmi_int(0x21, &myregs); /* Get PSP address */
  /* Get segment address of environment variables block */
  pspoffs = ((unsigned long)myregs.x.bx << 4) + 0x2C;
  envoffs = 0;
  dosmemget(pspoffs, 2, (void *)&envoffs);
  /* For debugging read whole PSP */
  dosmemget(pspoffs - 0x2C, 256, (void *)psparea);
  envoffs <<= 4; /* Physical offset of environment block */
  dosmemget(envoffs, 512, (void *)envarea);
}

After that "psparea" contains valid PSP (at first glance), but "envarea" contains
only random data, which have absolutely no similarity with environment block.
Why is this happening? Where is the error?