> What is the best way to get and set disk volume labels (in C) under OS/2?

Here's something for you, but it's not the best way (limited to drive a:
only). The DEBUG case is because I studied how a program handles empty
string as a command line parameter. OS/2's LABEL.EXE doesn't accept an
empty string if you want to clear a volume label, but this program does it.
All compilers I have handles this situation "correctly" except
GNU C/C++.

#define INCL_NOPMAPI
#define INCL_DOSFILEMGR   /* File Manager values */
#include 

#include 
#include 

int main (int argc, char **argv)
{
#ifdef __32BIT__
  ULONG       DriveNumber;    /* Drive number */
  ULONG       FSInfoLevel;    /* File system data type */
  ULONG       FSInfoBufSize;  /* File system info buffer size */
  VOLUMELABEL FSInfoBuf;      /* File system info buffer */
  APIRET      rc;             /* Return code */
#else
  USHORT      DriveNumber;    /* Drive number */
  USHORT      FSInfoLevel;    /* File system data type */
  USHORT      FSInfoBufSize;  /* File system info buffer size */
  FSINFO      FSInfoBuf;
  USHORT      rc;             /* Return code */
#endif
#ifdef DEBUG
  int i, j;
#endif

  /* Indicate that the caller wants to  change the volume label for the */
  /* specified drive */
  FSInfoLevel = FSIL_VOLSER;

  /* drive A: */
  DriveNumber = 1;

  /* Size of the entire VOLUMELABEL structure */
#ifdef __32BIT__
  FSInfoBufSize = sizeof (VOLUMELABEL);
#else
  FSInfoBufSize = sizeof (FSINFO);
#endif

  if (argc == 1)
  {
#ifdef __32BIT__
    rc = DosQueryFSInfo (DriveNumber, FSInfoLevel, &FSInfoBuf, FSInfoBufSize);
    printf ("Volume Label = %s\n", FSInfoBuf.szVolLabel);
#else
    rc = DosQFSInfo (DriveNumber, FSInfoLevel, (void *)&FSInfoBuf,
FSInfoBufSize);
    printf ("Volume Label = %s\n", FSInfoBuf.vol.szVolLabel);
#endif
    return (int) rc;
  }

#ifdef DEBUG
  for (j = 1; j < argc; j++)
    for (i = 0; i < strlen (argv[j]); i++)
      printf ("argv[%d][%d] = %c (%d)\n", j, i, argv[j][i], argv[j][i]);
#endif

  if (argc == 2)
  {
    if (argv[1][0] == '\"' && argv[1][1] == '\"')
    /* The new volume label for logical drive A: */
#ifdef __32BIT__
      FSInfoBuf.szVolLabel[0] = '\0';
    else
      strcpy (FSInfoBuf.szVolLabel, argv[1]);
#else
      FSInfoBuf.vol.szVolLabel[0] = '\0';
    else
      strcpy (FSInfoBuf.vol.szVolLabel, argv[1]);
#endif

    /* Length of the volume label string within the VOLUMELABEL structure */
#ifdef __32BIT__
    FSInfoBuf.cch = (BYTE) strlen (FSInfoBuf.szVolLabel);
    rc = DosSetFSInfo (DriveNumber, FSInfoLevel, &FSInfoBuf, FSInfoBufSize);
#else
    FSInfoBuf.vol.cch = (BYTE) strlen (FSInfoBuf.vol.szVolLabel);
    FSInfoBufSize = sizeof (VOLUMELABEL);
    rc = DosSetFSInfo (DriveNumber, FSInfoLevel,
(PBYTE)(&FSInfoBuf.vol), FSInfoBufSize);
#endif

    printf ("DosSetFSInfo return code = %d\n", (int)rc);
                       /* for debugging purposes */

  }
  else
  {
    printf ("USAGE: setvol \n");
    return 1;
  }

  return (int) rc;
}

        // Albert  (Team OS/2)
    email: albert{at}sci.fi
           jla{at}to.icl.fi (work)

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