/*
 * gcc long pointer support code for HPPA.
 * Copyright 1998, DIS International, Ltd.
 * This code is free software; you may redistribute it and/or modify
 * it under the same terms as Perl itself.  (Relicensed for Perl in
 * in April 2002 by Mark Klein.)
 */
typedef struct {
  int           spaceid;
  unsigned int  offset;
  } LONGPOINTER, longpointer;

/*
 * gcc long pointer support code for HPPA.
 * Copyright 1998, DIS International, Ltd.
 * This code is free software; you may redistribute it and/or modify
 * it under the same terms as Perl itself.  (Relicensed for Perl in
 * in April 2002 by Mark Klein.)
 */

int __perl_mpe_getspaceid(void *source)
  {
  int val;
  /*
   * Given the short pointer, determine it's space ID.
   */

  /*
   * The colons separate output from input parameters. In this case,
   * the output of the instruction (output indicated by the "=" in the
   * constraint) is to a memory location (indicated by the "m"). The
   * input constraint indicates that the source to the instruction
   * is a register reference (indicated by the "r").
   * The general format is:
   *   asm("<instruction template>" : <output> : <input> : <clobbers>);
   *     where <output> and <input> are:
   *       "<constraint>" (<token>)
   *     <instruction template> is the PA-RISC instruction in template fmt.
   *     <clobbers> indicates those registers clobbered by the instruction
   *     and provides hints to the optimizer.
   *
   * Refer to the gcc documentation
   */
  __asm__ __volatile__ (
      "   comiclr,= 0,%1,%%r28\n"
      "\t  ldsid (%%r0,%1),%%r28\n"
      "\t stw %%r28, %0"
                        : "=m" (val)    // Output to val
                        : "r" (source)  // Source must be gen reg
                        : "%r28");      // Clobbers %r28
  return (val);
  };

LONGPOINTER __perl_mpe_longaddr(void *source)
  {
  LONGPOINTER lptr;
  /*
   * Return the long pointer for the address in sr5 space.
   */

  __asm__ __volatile__ (
      "  comiclr,= 0,%2,%%r28\n"
      "\t    ldsid (%%r0,%2),%%r28\n"
      "\t  stw %%r28, %0\n"
      "\t  stw %2, %1"
                        : "=m" (lptr.spaceid),
                          "=m" (lptr.offset)    // Store to lptr
                        : "r" (source)          // Source must be gen reg
                        : "%r28");      // Clobbers %r28
  return (lptr);
  };

LONGPOINTER __perl_mpe_addtopointer(LONGPOINTER source,    // %r26 == source offset
                                                // %r25 == source space
                        int             len)    // %r24 == length in bytes
  {
  /*
   * Increment a longpointer.
   */

  __asm__ __volatile__ (
      "  copy %0,%%r28\n"                       // copy space to r28
      "\t  add %1,%2,%%r29"                     // Increment the pointer
                        :                       // No output
                        : "r" (source.spaceid), // Source address
                          "r" (source.offset),
                          "r" (len)             // Length
                        : "%r28",               // Clobbers
                          "%r29");
  };

void __perl_mpe_longmove(int len,                  // %r26 == byte length
              LONGPOINTER source,       // %r23 == source space, %r24 == off
              LONGPOINTER target)       // sp-#56 == target space, sp-#52== off
  {
  /*
   * Move data between two buffers in long pointer space.
   */

  __asm__ __volatile__ (
      "  .import $$lr_unk_unk_long,MILLICODE\n"
      "\t  mtsp %0,%%sr1\n"                     // copy source space to sr1
      "\t  copy %1,%%r26\n"                     // load source offset to r26
      "\t  copy %4,%%r24\n"                     // load length to r24
      "\t  copy %3,%%r25\n"                     // load target offset to r25
      "\t  bl $$lr_unk_unk_long,%%r31\n"        // start branch to millicode
      "\t  mtsp %2,%%sr2"                       // copy target space to sr2
                        :                       // No output
                        : "r" (source.spaceid), // Source address
                          "r" (source.offset),
                          "r" (target.spaceid), // Target address
                          "r" (target.offset),
                          "r" (len)             // Byte length
                        : "%r1",                // Clobbers
                          "%r24",
                          "%r25",
                          "%r26",
                          "%r31");
  };

int __perl_mpe_longpeek(LONGPOINTER source)
  {
  /*
   * Fetch the int in long pointer space.
   */
  unsigned int val;

  __asm__ __volatile__ (
      "  mtsp %1, %%sr1\n"
      "\t  copy %2, %%r28\n"
      "\t  ldw 0(%%sr1, %%r28), %%r28\n"
      "\t  stw %%r28, %0"
                        : "=m" (val)            // Output val
                        : "r" (source.spaceid), // Source space ID
                          "r" (source.offset)   // Source offset
                        : "%r28");              // Clobbers %r28

  return (val);
  };

void __perl_mpe_longpoke(LONGPOINTER target,       // %r25 == spaceid, %r26 == offset
          unsigned int val)             // %r24 == value
  {
  /*
   * Store the val into long pointer space.
   */
  __asm__ __volatile__ (
      "  mtsp %0,%%sr1\n"
      "\t  copy %1, %%r28\n"
      "\t  stw %2, 0(%%sr1, %%r28)"
                        :                       // No output
                        : "r" (target.spaceid), // Target space ID
                          "r" (target.offset),  // Target offset
                          "r" (val)             // Value to store
                        : "%r28"                // Clobbers %r28
                        );                      // Copy space to %sr1
  };

void __perl_mpe_move_fast(int len,                 // %r26 == byte length
               void *source,            // %r25 == source addr
               void *target)            // %r24 == target addr
  {
  /*
   * Move using short pointers.
   */
  __asm__ __volatile__ (
      "  .import $$lr_unk_unk,MILLICODE\n"
      "\t  copy %1, %%r26\n"                    // Move source addr into pos
      "\t  copy %2, %%r25\n"                    // Move target addr into pos
      "\t  bl $$lr_unk_unk,%%r31\n"             // Start branch to millicode
      "\t  copy %0, %%r24"                      // Move length into position
                        :                       // No output
                        : "r" (len),            // Byte length
                          "r" (source),         // Source address
                          "r" (target)          // Target address
                        : "%r24",               // Clobbers
                          "%r25",
                          "%r26",
                          "%r31");
  };

/*
 * ftruncate - set file size, BSD Style
 *
 * shortens or enlarges the file as neeeded
 * uses some undocumented locking call. It is known to work on SCO unix,
 * other vendors should try.
 * The #error directive prevents unsupported OSes
 *
 * ftruncate/truncate code by Mark Bixby.
 * This code is free software; you may redistribute it and/or modify
 * it under the same terms as Perl itself.
 *
 */

#ifndef _POSIX_SOURCE
#  define _POSIX_SOURCE
#endif
#ifndef _SOCKET_SOURCE
#  define _SOCKET_SOURCE
#endif
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <limits.h>
#include <mpe.h>

extern void FCONTROL(short, short, longpointer);
extern void PRINTFILEINFO(int);

int ftruncate(int fd, long wantsize);

int
ftruncate(int fd, long wantsize)
{
  int ccode_return,dummy=0;

  if (lseek(fd, wantsize, SEEK_SET) < 0)
  {
      return (-1);
  }

  FCONTROL(_mpe_fileno(fd),6,__perl_mpe_longaddr(&dummy)); /* Write new EOF */
  if ((ccode_return=ccode()) != CCE)
  {
          fprintf(stderr,
              "MPE ftruncate failed, ccode=%d, wantsize=%ld\n",
              ccode_return, wantsize);
          PRINTFILEINFO(_mpe_fileno(fd));
          errno = ESYSERR;
          return (-1);
  }

  return (0);
}

/*
   wrapper for truncate():

   truncate() is UNIX, not POSIX.

   This function requires ftruncate().



   NAME
      truncate -

   SYNOPSIS
      #include <unistd.h>

      int truncate(const char *pathname, off_t length);

                                             Returns: 0 if OK, -1 on error

            from: Stevens' Advanced Programming in the UNIX Environment, p. 92



   ERRORS
      EACCES
      EBADF
      EDQUOT (not POSIX)    <- not implemented here
      EFAULT
      EINVAL
      EISDIR
      ELOOP (not POSIX)     <- not implemented here
      ENAMETOOLONG
      ENOTDIR
      EROFS
      ETXTBSY (not POSIX)   <- not implemented here

                                          from: HP-UX man page



   Compile directives:
      PRINT_ERROR - make this function print an error message to stderr
*/


#include <sys/types.h>  /* off_t, required by open() */
#include <sys/stat.h>   /* required by open() */
#include <fcntl.h>      /* open() */
#include <unistd.h>     /* close() */
#include <stdio.h>      /* perror(), sprintf() */



int
truncate(const char *pathname, off_t length)
{
        int fd;
#ifdef PRINT_ERROR
        char error_msg[80+1];
#endif

        if (length == 0)
        {
                if ( (fd = open(pathname, O_WRONLY | O_TRUNC)) < 0)
                {
                        /* errno already set */
#ifdef PRINT_ERROR
                        sprintf(error_msg,
                                "truncate(): open(%s, O_WRONLY | OTRUNC)\0",
                                pathname);
                        perror(error_msg);
#endif
                        return -1;
                }
        }
        else
        {
                if ( (fd = open(pathname, O_WRONLY)) < 0)
                {
                        /* errno already set */
#ifdef PRINT_ERROR
                        sprintf(error_msg,
                                "truncate(): open(%s, O_WRONLY)\0",
                                pathname);
                        perror(error_msg);
#endif
                        return -1;
                }

                if (ftruncate(fd, length) < 0)
                {
                        /* errno already set */
#ifdef PRINT_ERROR
                        perror("truncate(): ftruncate()");
#endif
                        return -1;
                }
        }

        if (close(fd) < 0)
        {
                /* errno already set */
#ifdef PRINT_ERROR
                perror("truncate(): close()");
#endif
                return -1;
        }

        return 0;
} /* truncate() */

/* 
   wrapper for gettimeofday():
      gettimeofday() is UNIX, not POSIX.
      gettimeofday() is a BSD function.

   NAME
      gettimeofday -

   SYNOPSIS
      #include <sys/time.h>

      int gettimeofday(struct timeval *tp, struct timezone *tzp);

   DESCRIPTION
      This function returns seconds and microseconds since midnight
      January 1, 1970. The microseconds is actually only accurate to
      the millisecond.

      Note: To pick up the definitions of structs timeval and timezone
            from the <time.h> include file, the directive
            _SOCKET_SOURCE must be used.

   RETURN VALUE
      A 0 return value indicates that the call succeeded.  A -1 return
      value indicates an error occurred; errno is set to indicate the
      error.

   ERRORS
      EFAULT     not implemented

   Changes:
      2-91    DR.  Created.
*/


/* need _SOCKET_SOURCE to pick up structs timeval and timezone in time.h */
#ifndef _SOCKET_SOURCE
# define _SOCKET_SOURCE
#endif

#include <time.h>       /* structs timeval & timezone,
                                difftime(), localtime(), mktime(), time() */

extern int TIMER();

/*
 * gettimeofday code by Mark Bixby.
 * This code is free software; you may redistribute it and/or modify
 * it under the same terms as Perl itself.
 */

#ifdef __STDC__
int gettimeofday( struct timeval *tp, struct timezone *tpz )
#else
int gettimeofday(  tp, tpz )
struct timeval  *tp;
struct timezone *tpz;
#endif
{
   static unsigned long    basetime        = 0;
   static int              dsttime         = 0;
   static int              minuteswest     = 0;
   static int              oldtime         = 0;
   register int            newtime;


   /*-------------------------------------------------------------------*/
   /* Setup a base from which all future time will be computed.         */
   /*-------------------------------------------------------------------*/
   if ( basetime == 0 )
   {
      time_t    gmt_time;
      time_t    loc_time;
      struct tm *loc_time_tm;

      gmt_time    = time( NULL );
      loc_time_tm = localtime( &gmt_time ) ;
      loc_time    = mktime( loc_time_tm );

      oldtime     = TIMER();
      basetime    = (unsigned long) ( loc_time - (oldtime/1000) );

      /*----------------------------------------------------------------*/
      /* The calling process must be restarted if timezone or dst       */
      /* changes.                                                       */
      /*----------------------------------------------------------------*/
      minuteswest = (int) (difftime( loc_time, gmt_time ) / 60);
      dsttime     = loc_time_tm->tm_isdst;
   }

   /*-------------------------------------------------------------------*/
   /* Get the new time value. The timer value rolls over every 24 days, */
   /* so if the delta is negative, the basetime value is adjusted.      */
   /*-------------------------------------------------------------------*/
   newtime = TIMER();
   if ( newtime < oldtime )  basetime += 2073600;
   oldtime = newtime;

   /*-------------------------------------------------------------------*/
   /* Return the timestamp info.                                        */
   /*-------------------------------------------------------------------*/
   tp->tv_sec          = basetime + newtime/1000;
   tp->tv_usec         = (newtime%1000) * 1000;   /* only accurate to milli */
   if (tpz)
   {
      tpz->tz_minuteswest = minuteswest;
      tpz->tz_dsttime     = dsttime;
   }

   return 0;

} /* gettimeofday() */

/*
**  MPE_FCNTL -- shadow function for fcntl()
**
**      MPE requires sfcntl() for sockets, and fcntl() for everything 
**      else.  This shadow routine determines the descriptor type and
**      makes the appropriate call.
**
**      Parameters:
**              same as fcntl().
**
**      Returns:
**              same as fcntl().
*/

#include <stdarg.h>
#include <sys/socket.h>

int
mpe_fcntl(int fildes, int cmd, ...)
{
        int len, result;
        struct sockaddr sa;
        
        void *arg;
        va_list ap;
        
        va_start(ap, cmd);
        arg = va_arg(ap, void *);
        va_end(ap);
        
        len = sizeof sa;
        if (getsockname(fildes, &sa, &len) == -1)
        {
                if (errno == EAFNOSUPPORT)
                        /* AF_UNIX socket */
                        return sfcntl(fildes, cmd, arg);

                if (errno == ENOTSOCK) 
                        /* file or pipe */
                        return fcntl(fildes, cmd, arg);

                /* unknown getsockname() failure */
                return (-1); 
        }
        else
        {
                /* AF_INET socket */
                if ((result = sfcntl(fildes, cmd, arg)) != -1 && cmd == F_GETFL)
                        result |= O_RDWR;  /* fill in some missing flags */
                return result;
        }
}



/* 
 * Stuff from here on down is written by Ken Hirsch
 * and you may use it for any purpose.
 * No warranty, express or implied.
 */

#include <stddef.h>
#include <sys/ioctl.h>
#include <netinet/in.h>

#ifndef _SOCKLEN_T
typedef unsigned int socklen_t;
#define _SOCKLEN_T
#endif

static int max_io_size(int filedes);

ssize_t
mpe_read(int filedes, void *buffer, size_t len)
{
  int maxio;
  if (len > 4096 && (len > (maxio = max_io_size(filedes))))
    len = maxio;

  return read(filedes, buffer, len);
}

ssize_t
mpe_write(int filedes, const void *buffer, size_t len)
{
  int written = 0;
  int orig_len = len;
  int maxio = (len>4096)?max_io_size(filedes):INT_MAX;
  const char *buf = (const char *)buffer;

  do {
    written = write(filedes, buf, len>maxio?maxio:len);
    if (written < 0)
      break;
    len -= written;
    buf += written;
  } while (len > 0);

  if (written < 0 && len == orig_len)
    return -1;
  else
    return orig_len - len;
}


ssize_t
mpe_send(int socket, const void *buffer, size_t len, int flags)
{
  int written = 0;
  int orig_len = len;
  int maxio = (len>4096)?max_io_size(socket):INT_MAX;
  const char *buf = (const char *)buffer;

  do {
    written = send(socket, buf, len>maxio?maxio:len, flags);
    if (written < 0)
      break;
    len -= written;
    buf += written;
  } while (len > 0);

  if (written < 0 && len == orig_len)
    return -1;
  else
    return orig_len - len;
}

ssize_t
mpe_sendto(int socket, const void *buffer, size_t len,
       int flags, const struct sockaddr *dest_addr,
       socklen_t dest_len)
{
  int written = 0;
  int orig_len = len;
  int maxio = (len>4096)?max_io_size(socket):INT_MAX;
  const char *buf = (const char *)buffer;

  do {
    written = 
       sendto(socket, buf, len>maxio?maxio:len, flags, dest_addr, dest_len);
    if (written < 0)
      break;
    len -= written;
    buf += written;
  } while (len > 0);

  if (written < 0 && len == orig_len)
    return -1;
  else
    return orig_len - len;
}


ssize_t
mpe_recv(int socket, void *buffer, size_t len, int flags)
{
  int maxio;
  if (len > 4096 && (len > (maxio = max_io_size(socket))))
    len = maxio;
  return recv(socket, buffer, len, flags);
}

ssize_t
mpe_recvfrom(int socket, void *buffer, size_t len,
           int flags, struct sockaddr *address,
           socklen_t *address_len) 
{
  int maxio;
  if (len > 4096 && (len > (maxio = max_io_size(socket))))
    len = maxio;
  return recvfrom(socket, buffer, len, flags, address, address_len);
}

/*
   I didn't do thse two:
ssize_t mpe_recvmsg(int, struct msghdr *, int);
ssize_t mpe_sendmsg(int, const struct msghdr *, int);
*/

/* 
 * On MPE/iX (at least version 6.0), a getsockname()
 * performed on a socket that is listening
 * will return INADDR_ANY, even if you used
 * bind to bind it to a particular IP address.
 *
 * (In fact, it appears that the socket always acts as
 *  if you used INADDR_ANY.)
 *
 * Here I save the IP address used in bind
 * So I can get it in getsockname()
 *
 */

/* I just save 40.  Usually one or two should be enough
 */

int
mpe_connect(int socket, 
    const struct sockaddr *address,
    socklen_t address_len)
{
  int ret = connect(socket, address, address_len);
  if (ret < 0 && errno == EINPROGRESS)
  {
    /* Need to call getsockopt to clear socket error */
    int socket_error;
    socklen_t err_size = sizeof(socket_error);
    (void)getsockopt(socket, SOL_SOCKET, SO_ERROR,
                          &socket_error, &err_size);
    errno = EINPROGRESS;
  }
  return ret;
}

static struct {
  int fd;
  struct in_addr holdaddr;
} holdbind[40];
#define HOLDBINDLAST ((sizeof(holdbind))/(sizeof(holdbind[0])))
static int nextbind;

/*
 * Fix peculiarities of bind() on MPE
 * 1. call GETPRIVMODE to bind to ports < 1024
 * 2. save IP address for future calls to getsockname
 * 3. set IP address to 0 (INADDR_ANY)
 */

int
mpe_bind(int socket, const struct sockaddr *address, socklen_t address_len)
{
   int i;
   int result;
   int mpeprivmode=0;
   extern void GETPRIVMODE(void);
   extern void GETUSERMODE(void);

   for (i = 0; i<HOLDBINDLAST; i++) {
     if (holdbind[i].fd == socket)
       break;
   }
   /* If we didn't find previously used slot, use next */
   if (i == HOLDBINDLAST)
     i = nextbind;

   holdbind[i].fd = socket;

   memset(&holdbind[i].holdaddr, '\0', sizeof(holdbind[i].holdaddr));
   if (address->sa_family == AF_INET
      && address_len >= offsetof(struct sockaddr_in, sin_addr)
                        +sizeof(struct in_addr)) {
      holdbind[i].holdaddr = ((struct sockaddr_in *)address)->sin_addr;
   }
   if (i == nextbind)
   {
     if (++nextbind >= HOLDBINDLAST)
       nextbind = 0;
   }

   if (address->sa_family == AF_INET)
   {
        /* The address *MUST* stupidly be zero. */
        ((struct sockaddr_in *)address)->sin_addr.s_addr = INADDR_ANY;
        /* PRIV mode is required to bind() to ports < 1024. */
        if (((struct sockaddr_in *)address)->sin_port < 1024 &&
            ((struct sockaddr_in *)address)->sin_port > 0) {
            GETPRIVMODE(); /* If this fails, we are aborted by MPE/iX. */
            mpeprivmode = 1;
        }
    }
    result = bind(socket, address, address_len);
    if (mpeprivmode)
    {
      GETUSERMODE();
    }
    return result;

}

int 
mpe_getsockname(int socket, struct sockaddr *address, socklen_t *address_len)
{
  int ret;
  ret = getsockname(socket, address, address_len);
  if (ret == 0 
      && address->sa_family == AF_INET
      && *address_len >= offsetof(struct sockaddr_in, sin_addr)
                        +sizeof(struct in_addr)
      && ((struct sockaddr_in *)address)->sin_addr.s_addr == INADDR_ANY) {
    int i;
    for (i=0; i<HOLDBINDLAST; i++) {
      if (holdbind[i].fd == socket)
      {
        ((struct sockaddr_in *)address)->sin_addr.s_addr 
            = holdbind[i].holdaddr.s_addr;
        break;
      }
    }
  }
  return ret;
}

int 
mpe_getpeername(int socket, struct sockaddr *address, socklen_t *address_len)
{
  int ret;
  ret = getpeername(socket, address, address_len);
  if (ret == 0)
  {
    /* Try a zero-length write to see if socket really connected */
    int written = write(socket, "", 0);
    if (written < 0)
      ret = -1;
  }
  return ret;
}


static int
max_io_size(int filedes)
{
  int save_errno;
  struct sockaddr sa;
  int len;
  int result = INT_MAX; /* all other files */

  save_errno = errno;
  len = sizeof sa;
  if (getsockname(filedes, &sa, &len) == -1)
  {
     if (errno == EAFNOSUPPORT) /* AF_UNIX socket */
       result = 4096;
     errno = save_errno;
  } else {
    result = 30000; /* AF_INET sock max */
  }
  return result;
}