xref: /petsc/src/sys/classes/viewer/impls/ascii/filev.c (revision 559f443f3efe39b0dc4980743a08b01e8d194da9)

#include <../src/sys/classes/viewer/impls/ascii/asciiimpl.h>  /*I "petscviewer.h" I*/

#define QUEUESTRINGSIZE 8192

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileClose_ASCII"
static PetscErrorCode PetscViewerFileClose_ASCII(PetscViewer viewer)
{
  PetscErrorCode    ierr;
  PetscMPIInt       rank;
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  int               err;

  PetscFunctionBegin;
  ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)viewer),&rank);CHKERRQ(ierr);
  if (!rank && vascii->fd != stderr && vascii->fd != PETSC_STDOUT) {
    if (vascii->fd && vascii->closefile) {
      err = fclose(vascii->fd);
      if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fclose() failed on file");
    }
    if (vascii->storecompressed) {
      char par[PETSC_MAX_PATH_LEN],buf[PETSC_MAX_PATH_LEN];
      FILE *fp;
      ierr = PetscStrcpy(par,"gzip ");CHKERRQ(ierr);
      ierr = PetscStrcat(par,vascii->filename);CHKERRQ(ierr);
#if defined(PETSC_HAVE_POPEN)
      ierr = PetscPOpen(PETSC_COMM_SELF,NULL,par,"r",&fp);CHKERRQ(ierr);
      if (fgets(buf,1024,fp)) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_LIB,"Error from compression command %s\n%s",par,buf);
      ierr = PetscPClose(PETSC_COMM_SELF,fp,NULL);CHKERRQ(ierr);
#else
      SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
#endif
    }
  }
  ierr = PetscFree(vascii->filename);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

/* ----------------------------------------------------------------------*/
#undef __FUNCT__
#define __FUNCT__ "PetscViewerDestroy_ASCII"
PetscErrorCode PetscViewerDestroy_ASCII(PetscViewer viewer)
{
  PetscErrorCode    ierr;
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  PetscViewerLink   *vlink;
  PetscBool         flg;

  PetscFunctionBegin;
  if (vascii->sviewer) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ORDER,"ASCII PetscViewer destroyed before restoring singleton or subcomm PetscViewer");
  ierr = PetscViewerFileClose_ASCII(viewer);CHKERRQ(ierr);
  ierr = PetscFree(vascii);CHKERRQ(ierr);

  /* remove the viewer from the list in the MPI Communicator */
  if (Petsc_Viewer_keyval == MPI_KEYVAL_INVALID) {
    ierr = MPI_Keyval_create(MPI_NULL_COPY_FN,Petsc_DelViewer,&Petsc_Viewer_keyval,(void*)0);CHKERRQ(ierr);
  }

  ierr = MPI_Attr_get(PetscObjectComm((PetscObject)viewer),Petsc_Viewer_keyval,(void**)&vlink,(PetscMPIInt*)&flg);CHKERRQ(ierr);
  if (flg) {
    if (vlink && vlink->viewer == viewer) {
      if (vlink->next) {
        ierr = MPI_Attr_put(PetscObjectComm((PetscObject)viewer),Petsc_Viewer_keyval,vlink->next);CHKERRQ(ierr);
      } else {
        ierr = MPI_Attr_delete(PetscObjectComm((PetscObject)viewer),Petsc_Viewer_keyval);CHKERRQ(ierr);
      }
      ierr = PetscFree(vlink);CHKERRQ(ierr);
    } else {
      while (vlink && vlink->next) {
        if (vlink->next->viewer == viewer) {
          PetscViewerLink *nv = vlink->next;
          vlink->next = vlink->next->next;
          ierr = PetscFree(nv);CHKERRQ(ierr);
        }
        vlink = vlink->next;
      }
    }
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerDestroy_ASCII_SubViewer"
PetscErrorCode PetscViewerDestroy_ASCII_SubViewer(PetscViewer viewer)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  ierr = PetscViewerRestoreSubViewer(vascii->bviewer,0,&viewer);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFlush_ASCII"
PetscErrorCode PetscViewerFlush_ASCII(PetscViewer viewer)
{
  PetscErrorCode    ierr;
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  int               err;
  MPI_Comm          comm;
  PetscMPIInt       rank,size;
  FILE              *fd = vascii->fd;

  PetscFunctionBegin;
  ierr = PetscObjectGetComm((PetscObject)viewer,&comm);CHKERRQ(ierr);
  ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr);
  ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr);

  if (!vascii->bviewer && !rank && (vascii->mode != FILE_MODE_READ)) {
    err = fflush(vascii->fd);
    if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() call failed");
  }

  if (vascii->allowsynchronized) {
    PetscMPIInt   tag,i,j,n = 0,dummy = 0;
    char          *message;
    MPI_Status    status;

    ierr = PetscCommDuplicate(comm,&comm,&tag);CHKERRQ(ierr);

    /* First processor waits for messages from all other processors */
    if (!rank) {
      /* flush my own messages that I may have queued up */
      PrintfQueue next = vascii->petsc_printfqueuebase,previous;
      for (i=0; i<vascii->petsc_printfqueuelength; i++) {
        if (!vascii->bviewer) {
          ierr = PetscFPrintf(comm,fd,"%s",next->string);CHKERRQ(ierr);
        } else {
          ierr = PetscViewerASCIISynchronizedPrintf(vascii->bviewer,"%s",next->string);CHKERRQ(ierr);
        }
        previous = next;
        next     = next->next;
        ierr     = PetscFree(previous->string);CHKERRQ(ierr);
        ierr     = PetscFree(previous);CHKERRQ(ierr);
      }
      vascii->petsc_printfqueue       = 0;
      vascii->petsc_printfqueuelength = 0;
      for (i=1; i<size; i++) {
        /* to prevent a flood of messages to process zero, request each message separately */
        ierr = MPI_Send(&dummy,1,MPI_INT,i,tag,comm);CHKERRQ(ierr);
        ierr = MPI_Recv(&n,1,MPI_INT,i,tag,comm,&status);CHKERRQ(ierr);
        for (j=0; j<n; j++) {
          PetscMPIInt size = 0;

          ierr = MPI_Recv(&size,1,MPI_INT,i,tag,comm,&status);CHKERRQ(ierr);
          ierr = PetscMalloc1(size, &message);CHKERRQ(ierr);
          ierr = MPI_Recv(message,size,MPI_CHAR,i,tag,comm,&status);CHKERRQ(ierr);
          if (!vascii->bviewer) {
            ierr = PetscFPrintf(comm,fd,"%s",message);CHKERRQ(ierr);
          } else {
            ierr = PetscViewerASCIISynchronizedPrintf(vascii->bviewer,"%s",message);CHKERRQ(ierr);
          }
          ierr = PetscFree(message);CHKERRQ(ierr);
        }
      }
    } else { /* other processors send queue to processor 0 */
      PrintfQueue next = vascii->petsc_printfqueuebase,previous;

      ierr = MPI_Recv(&dummy,1,MPI_INT,0,tag,comm,&status);CHKERRQ(ierr);
      ierr = MPI_Send(&vascii->petsc_printfqueuelength,1,MPI_INT,0,tag,comm);CHKERRQ(ierr);
      for (i=0; i<vascii->petsc_printfqueuelength; i++) {
        ierr     = MPI_Send(&next->size,1,MPI_INT,0,tag,comm);CHKERRQ(ierr);
        ierr     = MPI_Send(next->string,next->size,MPI_CHAR,0,tag,comm);CHKERRQ(ierr);
        previous = next;
        next     = next->next;
        ierr     = PetscFree(previous->string);CHKERRQ(ierr);
        ierr     = PetscFree(previous);CHKERRQ(ierr);
      }
      vascii->petsc_printfqueue       = 0;
      vascii->petsc_printfqueuelength = 0;
    }
    ierr = PetscCommDestroy(&comm);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIGetPointer"
/*@C
    PetscViewerASCIIGetPointer - Extracts the file pointer from an ASCII PetscViewer.

    Not Collective

+   viewer - PetscViewer context, obtained from PetscViewerASCIIOpen()
-   fd - file pointer

    Level: intermediate

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewer^file pointer
  Concepts: file pointer^getting from PetscViewer

.seealso: PetscViewerASCIIOpen(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerCreate(), PetscViewerASCIIPrintf(),
          PetscViewerASCIISynchronizedPrintf(), PetscViewerFlush()
@*/
PetscErrorCode  PetscViewerASCIIGetPointer(PetscViewer viewer,FILE **fd)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;

  PetscFunctionBegin;
  *fd = vascii->fd;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileGetMode_ASCII"
PetscErrorCode  PetscViewerFileGetMode_ASCII(PetscViewer viewer, PetscFileMode *mode)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;

  PetscFunctionBegin;
  *mode = vascii->mode;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileSetMode_ASCII"
PetscErrorCode  PetscViewerFileSetMode_ASCII(PetscViewer viewer, PetscFileMode mode)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;

  PetscFunctionBegin;
  vascii->mode = mode;
  PetscFunctionReturn(0);
}

/*
   If petsc_history is on, then all Petsc*Printf() results are saved
   if the appropriate (usually .petschistory) file.
*/
extern FILE *petsc_history;

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIISetTab"
/*@
    PetscViewerASCIISetTab - Causes PetscViewer to tab in a number of times

    Not Collective, but only first processor in set has any effect

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    tabs - number of tabs

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(), PetscViewerASCIIGetTab(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer(), PetscViewerASCIIPushTab()
@*/
PetscErrorCode  PetscViewerASCIISetTab(PetscViewer viewer,PetscInt tabs)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) ascii->tab = tabs;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIGetTab"
/*@
    PetscViewerASCIIGetTab - Return the number of tabs used by PetscViewer.

    Not Collective, meaningful on first processor only.

    Input Parameters:
.    viewer - optained with PetscViewerASCIIOpen()
    Output Parameters:
.    tabs - number of tabs

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^retrieval

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(), PetscViewerASCIISetTab(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer(), PetscViewerASCIIPushTab()
@*/
PetscErrorCode  PetscViewerASCIIGetTab(PetscViewer viewer,PetscInt *tabs)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii && tabs) *tabs = ascii->tab;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIAddTab"
/*@
    PetscViewerASCIIAddTab - Add to the number of times an ASCII viewer tabs before printing

    Not Collective, but only first processor in set has any effect

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    tabs - number of tabs

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer(), PetscViewerASCIIPushTab()
@*/
PetscErrorCode  PetscViewerASCIIAddTab(PetscViewer viewer,PetscInt tabs)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) ascii->tab += tabs;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIISubtractTab"
/*@
    PetscViewerASCIISubtractTab - Subtracts from the number of times an ASCII viewer tabs before printing

    Not Collective, but only first processor in set has any effect

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    tabs - number of tabs

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer(), PetscViewerASCIIPushTab()
@*/
PetscErrorCode  PetscViewerASCIISubtractTab(PetscViewer viewer,PetscInt tabs)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) ascii->tab -= tabs;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIISynchronizedAllow"
/*@C
    PetscViewerASCIISynchronizedAllow - Allows calls to PetscViewerASCIISynchronizedPrintf() for this viewer

    Collective on PetscViewer

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    allow - PETSC_TRUE to allow the synchronized printing

    Level: intermediate

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer()
@*/
PetscErrorCode  PetscViewerASCIISynchronizedAllow(PetscViewer viewer,PetscBool allow)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) ascii->allowsynchronized = allow;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIPushTab"
/*@
    PetscViewerASCIIPushTab - Adds one more tab to the amount that PetscViewerASCIIPrintf()
     lines are tabbed.

    Not Collective, but only first processor in set has any effect

    Input Parameters:
.    viewer - optained with PetscViewerASCIIOpen()

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer()
@*/
PetscErrorCode  PetscViewerASCIIPushTab(PetscViewer viewer)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) ascii->tab++;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIPopTab"
/*@
    PetscViewerASCIIPopTab - Removes one tab from the amount that PetscViewerASCIIPrintf()
     lines are tabbed.

    Not Collective, but only first processor in set has any effect

    Input Parameters:
.    viewer - optained with PetscViewerASCIIOpen()

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPushTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer()
@*/
PetscErrorCode  PetscViewerASCIIPopTab(PetscViewer viewer)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscErrorCode    ierr;
  PetscBool         iascii;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) {
    if (ascii->tab <= 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"More tabs popped than pushed");
    ascii->tab--;
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIUseTabs"
/*@
    PetscViewerASCIIUseTabs - Turns on or off the use of tabs with the ASCII PetscViewer

    Not Collective, but only first processor in set has any effect

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    flg - PETSC_TRUE or PETSC_FALSE

    Level: developer

    Fortran Note:
    This routine is not supported in Fortran.

  Concepts: PetscViewerASCII^formating
  Concepts: tab^setting

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIPrintf(),
          PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(), PetscViewerASCIIPushTab(), PetscViewerASCIIOpen(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer()
@*/
PetscErrorCode  PetscViewerASCIIUseTabs(PetscViewer viewer,PetscBool flg)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         iascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (iascii) {
    if (flg) ascii->tab = ascii->tab_store;
    else {
      ascii->tab_store = ascii->tab;
      ascii->tab       = 0;
    }
  }
  PetscFunctionReturn(0);
}

/* ----------------------------------------------------------------------- */


#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIPrintf"
/*@C
    PetscViewerASCIIPrintf - Prints to a file, only from the first
    processor in the PetscViewer

    Not Collective, but only first processor in set has any effect

    Input Parameters:
+    viewer - optained with PetscViewerASCIIOpen()
-    format - the usual printf() format string

    Level: developer

    Fortran Note:
    The call sequence is PetscViewerASCIIPrintf(PetscViewer, character(*), int ierr) from Fortran.
    That is, you can only pass a single character string from Fortran.

  Concepts: PetscViewerASCII^printing
  Concepts: printing^to file
  Concepts: printf

.seealso: PetscPrintf(), PetscSynchronizedPrintf(), PetscViewerASCIIOpen(),
          PetscViewerASCIIPushTab(), PetscViewerASCIIPopTab(), PetscViewerASCIISynchronizedPrintf(),
          PetscViewerCreate(), PetscViewerDestroy(), PetscViewerSetType(), PetscViewerASCIIGetPointer(), PetscViewerASCIISynchronizedAllow()
@*/
PetscErrorCode  PetscViewerASCIIPrintf(PetscViewer viewer,const char format[],...)
{
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)viewer->data;
  PetscMPIInt       rank;
  PetscInt          tab,intab = ascii->tab;
  PetscErrorCode    ierr;
  FILE              *fd = ascii->fd;
  PetscBool         iascii;
  int               err;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  PetscValidCharPointer(format,2);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (!iascii) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Not ASCII PetscViewer");
  ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)viewer),&rank);CHKERRQ(ierr);
  if (rank) PetscFunctionReturn(0);

  if (ascii->bviewer) { /* pass string up to parent viewer */
    char        *string;
    va_list     Argp;
    size_t      fullLength;

    ierr       = PetscCalloc1(QUEUESTRINGSIZE, &string);CHKERRQ(ierr);
    tab        = intab;
    tab       *= 2;
    while (tab--) {
      *string++ = ' ';
    }
    va_start(Argp,format);
    ierr = PetscVSNPrintf(string,QUEUESTRINGSIZE-2*ascii->tab,format,&fullLength,Argp);CHKERRQ(ierr);
    va_end(Argp);

    ierr = PetscViewerASCIISynchronizedPrintf(viewer,"%s",string);CHKERRQ(ierr);
    ierr = PetscFree(string);CHKERRQ(ierr);
  } else { /* write directly to file */
    va_list Argp;
    /* flush my own messages that I may have queued up */
    PrintfQueue next = ascii->petsc_printfqueuebase,previous;
    PetscInt    i;
    for (i=0; i<ascii->petsc_printfqueuelength; i++) {
      ierr = PetscFPrintf(PETSC_COMM_SELF,fd,"%s",next->string);CHKERRQ(ierr);
      previous = next;
      next     = next->next;
      ierr     = PetscFree(previous->string);CHKERRQ(ierr);
      ierr     = PetscFree(previous);CHKERRQ(ierr);
    }
    ascii->petsc_printfqueue       = 0;
    ascii->petsc_printfqueuelength = 0;
    tab = intab;
    while (tab--) {
      ierr = PetscFPrintf(PETSC_COMM_SELF,fd,"  ");CHKERRQ(ierr);
    }

    va_start(Argp,format);
    ierr = (*PetscVFPrintf)(fd,format,Argp);CHKERRQ(ierr);
    err  = fflush(fd);
    if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    if (petsc_history) {
      va_start(Argp,format);
      tab = intab;
      while (tab--) {
        ierr = PetscFPrintf(PETSC_COMM_SELF,petsc_history,"  ");CHKERRQ(ierr);
      }
      ierr = (*PetscVFPrintf)(petsc_history,format,Argp);CHKERRQ(ierr);
      err  = fflush(petsc_history);
      if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    }
    va_end(Argp);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileSetName"
/*@C
     PetscViewerFileSetName - Sets the name of the file the PetscViewer uses.

    Collective on PetscViewer

  Input Parameters:
+  viewer - the PetscViewer; either ASCII or binary
-  name - the name of the file it should use

    Level: advanced

.seealso: PetscViewerCreate(), PetscViewerSetType(), PetscViewerASCIIOpen(), PetscViewerBinaryOpen(), PetscViewerDestroy(),
          PetscViewerASCIIGetPointer(), PetscViewerASCIIPrintf(), PetscViewerASCIISynchronizedPrintf()

@*/
PetscErrorCode  PetscViewerFileSetName(PetscViewer viewer,const char name[])
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  PetscValidCharPointer(name,2);
  ierr = PetscTryMethod(viewer,"PetscViewerFileSetName_C",(PetscViewer,const char[]),(viewer,name));CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileGetName"
/*@C
     PetscViewerFileGetName - Gets the name of the file the PetscViewer uses.

    Not Collective

  Input Parameter:
.  viewer - the PetscViewer; either ASCII or binary

  Output Parameter:
.  name - the name of the file it is using

    Level: advanced

.seealso: PetscViewerCreate(), PetscViewerSetType(), PetscViewerASCIIOpen(), PetscViewerBinaryOpen(), PetscViewerFileSetName()

@*/
PetscErrorCode  PetscViewerFileGetName(PetscViewer viewer,const char **name)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  ierr = PetscTryMethod(viewer,"PetscViewerFileGetName_C",(PetscViewer,const char**),(viewer,name));CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileGetName_ASCII"
PetscErrorCode  PetscViewerFileGetName_ASCII(PetscViewer viewer,const char **name)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;

  PetscFunctionBegin;
  *name = vascii->filename;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerFileSetName_ASCII"
PetscErrorCode  PetscViewerFileSetName_ASCII(PetscViewer viewer,const char name[])
{
  PetscErrorCode    ierr;
  size_t            len;
  char              fname[PETSC_MAX_PATH_LEN],*gz;
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  PetscBool         isstderr,isstdout;
  PetscMPIInt       rank;

  PetscFunctionBegin;
  ierr = PetscViewerFileClose_ASCII(viewer);CHKERRQ(ierr);
  if (!name) PetscFunctionReturn(0);
  ierr = PetscStrallocpy(name,&vascii->filename);CHKERRQ(ierr);

  /* Is this file to be compressed */
  vascii->storecompressed = PETSC_FALSE;

  ierr = PetscStrstr(vascii->filename,".gz",&gz);CHKERRQ(ierr);
  if (gz) {
    ierr = PetscStrlen(gz,&len);CHKERRQ(ierr);
    if (len == 3) {
      *gz = 0;
      vascii->storecompressed = PETSC_TRUE;
    }
  }
  ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)viewer),&rank);CHKERRQ(ierr);
  if (!rank) {
    ierr = PetscStrcmp(name,"stderr",&isstderr);CHKERRQ(ierr);
    ierr = PetscStrcmp(name,"stdout",&isstdout);CHKERRQ(ierr);
    /* empty filename means stdout */
    if (name[0] == 0)  isstdout = PETSC_TRUE;
    if (isstderr)      vascii->fd = PETSC_STDERR;
    else if (isstdout) vascii->fd = PETSC_STDOUT;
    else {


      ierr = PetscFixFilename(name,fname);CHKERRQ(ierr);
      switch (vascii->mode) {
      case FILE_MODE_READ:
        vascii->fd = fopen(fname,"r");
        break;
      case FILE_MODE_WRITE:
        vascii->fd = fopen(fname,"w");
        break;
      case FILE_MODE_APPEND:
        vascii->fd = fopen(fname,"a");
        break;
      case FILE_MODE_UPDATE:
        vascii->fd = fopen(fname,"r+");
        if (!vascii->fd) vascii->fd = fopen(fname,"w+");
        break;
      case FILE_MODE_APPEND_UPDATE:
        /* I really want a file which is opened at the end for updating,
           not a+, which opens at the beginning, but makes writes at the end.
        */
        vascii->fd = fopen(fname,"r+");
        if (!vascii->fd) vascii->fd = fopen(fname,"w+");
        else {
          ierr     = fseek(vascii->fd, 0, SEEK_END);CHKERRQ(ierr);
        }
        break;
      default:
        SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG, "Invalid file mode %d", vascii->mode);
      }
      if (!vascii->fd) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_FILE_OPEN,"Cannot open PetscViewer file: %s",fname);
    }
  }
#if defined(PETSC_USE_LOG)
  PetscLogObjectState((PetscObject)viewer,"File: %s",name);
#endif
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerGetSubViewer_ASCII"
PetscErrorCode PetscViewerGetSubViewer_ASCII(PetscViewer viewer,MPI_Comm subcomm,PetscViewer *outviewer)
{
  PetscMPIInt       rank;
  PetscErrorCode    ierr;
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data,*ovascii;

  PetscFunctionBegin;
  if (vascii->sviewer) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ORDER,"SubViewer already obtained from PetscViewer and not restored");
  ierr = PetscViewerASCIISynchronizedAllow(viewer,PETSC_TRUE);CHKERRQ(ierr);
  ierr         = PetscViewerCreate(subcomm,outviewer);CHKERRQ(ierr);
  ierr         = PetscViewerSetType(*outviewer,PETSCVIEWERASCII);CHKERRQ(ierr);
  ierr         = PetscViewerASCIISynchronizedAllow(*outviewer,PETSC_TRUE);CHKERRQ(ierr);
  ovascii      = (PetscViewer_ASCII*)(*outviewer)->data;
  ovascii->fd  = vascii->fd;
  ovascii->tab = vascii->tab;

  vascii->sviewer = *outviewer;

  (*outviewer)->format  = viewer->format;

  ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)viewer),&rank);CHKERRQ(ierr);
  ((PetscViewer_ASCII*)((*outviewer)->data))->bviewer = viewer;
  (*outviewer)->ops->destroy = PetscViewerDestroy_ASCII_SubViewer;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerRestoreSubViewer_ASCII"
PetscErrorCode PetscViewerRestoreSubViewer_ASCII(PetscViewer viewer,MPI_Comm comm,PetscViewer *outviewer)
{
  PetscErrorCode    ierr;
  PetscViewer_ASCII *ascii  = (PetscViewer_ASCII*)viewer->data;

  PetscFunctionBegin;
  if (!ascii->sviewer) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ORDER,"SubViewer PetscViewer never obtained from PetscViewer");
  if (ascii->sviewer != *outviewer) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"This PetscViewer did not generate a SubViewer PetscViewer");

  ascii->sviewer             = 0;
  (*outviewer)->ops->destroy = PetscViewerDestroy_ASCII;
  ierr                       = PetscViewerDestroy(outviewer);CHKERRQ(ierr);
  ierr                       = PetscViewerFlush(viewer);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerView_ASCII"
PetscErrorCode  PetscViewerView_ASCII(PetscViewer v,PetscViewer viewer)
{
  PetscErrorCode    ierr;
  PetscViewer_ASCII *ascii = (PetscViewer_ASCII*)v->data;

  PetscFunctionBegin;
  if (ascii->filename) {
    ierr = PetscViewerASCIIPrintf(viewer,"Filename: %s\n",ascii->filename);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerCreate_ASCII"
PETSC_EXTERN PetscErrorCode PetscViewerCreate_ASCII(PetscViewer viewer)
{
  PetscViewer_ASCII *vascii;
  PetscErrorCode    ierr;

  PetscFunctionBegin;
  ierr         = PetscNewLog(viewer,&vascii);CHKERRQ(ierr);
  viewer->data = (void*)vascii;

  viewer->ops->destroy          = PetscViewerDestroy_ASCII;
  viewer->ops->flush            = PetscViewerFlush_ASCII;
  viewer->ops->getsubviewer     = PetscViewerGetSubViewer_ASCII;
  viewer->ops->restoresubviewer = PetscViewerRestoreSubViewer_ASCII;
  viewer->ops->view             = PetscViewerView_ASCII;
  viewer->ops->read             = PetscViewerASCIIRead;

  /* defaults to stdout unless set with PetscViewerFileSetName() */
  vascii->fd        = PETSC_STDOUT;
  vascii->mode      = FILE_MODE_WRITE;
  vascii->bviewer   = 0;
  vascii->subviewer = 0;
  vascii->sviewer   = 0;
  vascii->tab       = 0;
  vascii->tab_store = 0;
  vascii->filename  = 0;
  vascii->closefile = PETSC_TRUE;

  ierr = PetscObjectComposeFunction((PetscObject)viewer,"PetscViewerFileSetName_C",PetscViewerFileSetName_ASCII);CHKERRQ(ierr);
  ierr = PetscObjectComposeFunction((PetscObject)viewer,"PetscViewerFileGetName_C",PetscViewerFileGetName_ASCII);CHKERRQ(ierr);
  ierr = PetscObjectComposeFunction((PetscObject)viewer,"PetscViewerFileGetMode_C",PetscViewerFileGetMode_ASCII);CHKERRQ(ierr);
  ierr = PetscObjectComposeFunction((PetscObject)viewer,"PetscViewerFileSetMode_C",PetscViewerFileSetMode_ASCII);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIISynchronizedPrintf"
/*@C
    PetscViewerASCIISynchronizedPrintf - Prints synchronized output to the specified file from
    several processors.  Output of the first processor is followed by that of the
    second, etc.

    Not Collective, must call collective PetscViewerFlush() to get the results out

    Input Parameters:
+   viewer - the ASCII PetscViewer
-   format - the usual printf() format string

    Level: intermediate

    Notes: You must have previously called PetscViewerASCIISynchronizeAllow() to allow this routine to be called.

    Fortran Note:
      Can only print a single character* string

.seealso: PetscSynchronizedPrintf(), PetscSynchronizedFlush(), PetscFPrintf(),
          PetscFOpen(), PetscViewerFlush(), PetscViewerASCIIGetPointer(), PetscViewerDestroy(), PetscViewerASCIIOpen(),
          PetscViewerASCIIPrintf(), PetscViewerASCIISynchronizedAllow()

@*/
PetscErrorCode  PetscViewerASCIISynchronizedPrintf(PetscViewer viewer,const char format[],...)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  PetscErrorCode    ierr;
  PetscMPIInt       rank;
  PetscInt          tab = vascii->tab;
  MPI_Comm          comm;
  FILE              *fp;
  PetscBool         iascii,hasbviewer = PETSC_FALSE;
  int               err;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  PetscValidCharPointer(format,2);
  ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
  if (!iascii) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Not ASCII PetscViewer");
  if (!vascii->allowsynchronized) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"First call PetscViewerASCIISynchronizedAllow() to allow this call");

  ierr = PetscObjectGetComm((PetscObject)viewer,&comm);CHKERRQ(ierr);
  ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr);

  if (vascii->bviewer) {
    hasbviewer = PETSC_TRUE;
    if (!rank) {
      vascii = (PetscViewer_ASCII*)vascii->bviewer->data;
      ierr = PetscObjectGetComm((PetscObject)viewer,&comm);CHKERRQ(ierr);
      ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr);
    }
  }

  fp   = vascii->fd;

  if (!rank && !hasbviewer) {   /* First processor prints immediately to fp */
    va_list Argp;
    /* flush my own messages that I may have queued up */
    PrintfQueue next = vascii->petsc_printfqueuebase,previous;
    PetscInt    i;
    for (i=0; i<vascii->petsc_printfqueuelength; i++) {
      ierr = PetscFPrintf(comm,fp,"%s",next->string);CHKERRQ(ierr);
      previous = next;
      next     = next->next;
      ierr     = PetscFree(previous->string);CHKERRQ(ierr);
      ierr     = PetscFree(previous);CHKERRQ(ierr);
    }
    vascii->petsc_printfqueue       = 0;
    vascii->petsc_printfqueuelength = 0;

    while (tab--) {
      ierr = PetscFPrintf(PETSC_COMM_SELF,fp,"  ");CHKERRQ(ierr);
    }

    va_start(Argp,format);
    ierr = (*PetscVFPrintf)(fp,format,Argp);CHKERRQ(ierr);
    err  = fflush(fp);
    if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    if (petsc_history) {
      va_start(Argp,format);
      ierr = (*PetscVFPrintf)(petsc_history,format,Argp);CHKERRQ(ierr);
      err  = fflush(petsc_history);
      if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    }
    va_end(Argp);
  } else { /* other processors add to queue */
    char        *string;
    va_list     Argp;
    size_t      fullLength;
    PrintfQueue next;

    ierr = PetscNew(&next);CHKERRQ(ierr);
    if (vascii->petsc_printfqueue) {
      vascii->petsc_printfqueue->next = next;
      vascii->petsc_printfqueue       = next;
    } else {
      vascii->petsc_printfqueuebase = vascii->petsc_printfqueue = next;
    }
    vascii->petsc_printfqueuelength++;
    next->size = QUEUESTRINGSIZE;
    ierr       = PetscMalloc1(next->size, &next->string);CHKERRQ(ierr);
    ierr       = PetscMemzero(next->string,next->size);CHKERRQ(ierr);
    string     = next->string;
    tab       *= 2;
    while (tab--) {
      *string++ = ' ';
    }
    va_start(Argp,format);
    ierr = PetscVSNPrintf(string,next->size-2*vascii->tab,format,&fullLength,Argp);CHKERRQ(ierr);
    va_end(Argp);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerASCIIRead"
/*@C
   PetscViewerASCIIRead - Reads from am ASCII file

   Collective on MPI_Comm

   Input Parameters:
+  viewer - the ascii viewer
.  data - location to write the data
.  num - number of items of data to read
-  datatype - type of data to read

   Output Parameters:
.  count - number of items of data actually read, or NULL

   Level: beginner

   Concepts: ascii files

.seealso: PetscViewerASCIIOpen(), PetscViewerSetFormat(), PetscViewerDestroy(),
          VecView(), MatView(), VecLoad(), MatLoad(), PetscViewerBinaryGetDescriptor(),
          PetscViewerBinaryGetInfoPointer(), PetscFileMode, PetscViewer, PetscBinaryViewerRead()
@*/
PetscErrorCode PetscViewerASCIIRead(PetscViewer viewer,void *data,PetscInt num,PetscInt *count,PetscDataType dtype)
{
  PetscViewer_ASCII *vascii = (PetscViewer_ASCII*)viewer->data;
  FILE              *fd = vascii->fd;
  PetscInt           i;
  int                ret = 0;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  for (i=0; i<num; i++) {
    if (dtype == PETSC_CHAR)         ret = fscanf(fd, "%c",  &(((char*)data)[i]));
    else if (dtype == PETSC_STRING)  ret = fscanf(fd, "%s",  &(((char*)data)[i]));
#if PETSC_USE_64BIT_INDICES
#if (PETSC_SIZEOF_LONG_LONG == 8)
    else if (dtype == PETSC_INT)     ret = fscanf(fd, "%ld",  &(((PetscInt*)data)[i]));
#else
    else if (dtype == PETSC_INT)     ret = fscanf(fd, "%lld",  &(((PetscInt*)data)[i]));
#endif
#else
    else if (dtype == PETSC_INT)     ret = fscanf(fd, "%d",  &(((PetscInt*)data)[i]));
#endif
    else if (dtype == PETSC_ENUM)    ret = fscanf(fd, "%d",  &(((int*)data)[i]));
    else if (dtype == PETSC_FLOAT)   ret = fscanf(fd, "%f",  &(((float*)data)[i]));
    else if (dtype == PETSC_DOUBLE)  ret = fscanf(fd, "%lg", &(((double*)data)[i]));
    else {SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Data type %d not supported", (int) dtype);}
    if (!ret) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Conversion error for data type %d", (int) dtype);
    else if (ret < 0) break; /* Proxy for EOF, need to check for it in configure */
  }
  if (count) *count = i;
  else if (ret < 0) SETERRQ2(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Insufficient data, read only %D < %D items", i, num);
  PetscFunctionReturn(0);
}