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Date: Mon, 12 Oct 92 12:01:22 PDT
From: nvcc!fozztexx@calvin.sfasu.EDU (Chris Osborn)
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To: hyperc-l@calvin.sfasu.edu
Subject: Easy way to call ProDOS
Status: R

Here is an easy way to call ProDOS from your C program. This is much easier
because you can continue to use the cc shell script and you don't have to bother
with linking several files together. Just pop this into your C source code.

Excerpt from csh.c:
#ifndef _STRING_H
void strncpy(dest, from, len)
     char *dest, *from;
     int len;
{
  int i;


  for (i = 0; i < len; i++)
    dest[i] = from[i];

  return;
}
#endif

#ifndef unix
static char parms[32]; /* External so I don't have to put it in every function */
static char pathbuf[66];

int call_pdos(cmd, parms)
     unsigned int cmd;
     unsigned int parms;
{
  int (*f)();
  static unsigned char p[] = {0x20, 0x00, 0xbf, 0x00, 0x00, 0x00, 0x85, 0xee, 0xa9, 0x00,  
0x85, 0xef, 0x60};


  p[3] = cmd;
  p[4] = parms & 0xff;
  p[5] = (parms >> 8) & 0xff;
  f = p;
  return (*f)();
}

int chdir(path)
     char *path;
{
  int i;


  strncpy(&pathbuf[1], path, 64);
  pathbuf[66] = 0;
  pathbuf[0] = strlen(&pathbuf[1]);

  i = (int) &pathbuf[0];
  parms[0] = 0x01;
  parms[1] = i & 0xff;
  parms[2] = (i >> 8) & 0xff;

  return call_pdos(0xc6, parms);
}
#endif /* unix */

And here's a little main function to test it out:
int main(argc, argv)
     int argc;
     char *argv[];
{
  int err;


  if (argc > 2) {
    printf("%s: Too many arguments\n", argv[0]);
    return 1;
  }

  if (argc < 2) {
    printf("%s: Chdir to what?\n", argv[0]);
    return 1;
  }

  err = chdir(argv[1]);

  switch (err) {
  case 0:
    return 0;

  case 0x44:
    printf("%s: No such file or directory\n", argv[1]);
    return 1;

  default:
    printf("I/O error\n");
    return err;
  }
}

Also, I'm about 90% complete with my reformatting of the Ascii version of the
Hyper C manuals into FrameMaker. Mostly need to convert all the Ascii pics
into real graphics. Then I can begin with the rewrite/reorganization. Would
be nice to have a printed copy of the original manual to refer to, or at least a
copy of the graphs that went with the manual.

Oh, has anyone gotten a nice unix like make working? My csh takes too long to
compile, so I'd like to break it up into several modules. Without make though,
it's too much work to compile and link, so I'm just putting everything into one
big file.

---
Chris Osborn
Napa Valley College
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