1: #define PETSC_DLL
 2:  #include src/sys/viewer/viewerimpl.h
  3: #include <stdarg.h>
  4: #if defined(PETSC_HAVE_STDLIB_H)
  5: #include <stdlib.h>
  6: #endif
  7: #include "petscfix.h"

  9: typedef struct  {
 10:   char         *string;   /* string where info is stored */
 11:   char         *head;     /* pointer to begining of unused portion */
 12:   size_t       curlen,maxlen;
 13: } PetscViewer_String;

 17: static PetscErrorCode PetscViewerDestroy_String(PetscViewer viewer)
 18: {
 19:   PetscViewer_String *vstr = (PetscViewer_String *)viewer->data;
 20:   PetscErrorCode     ierr;

 23:   PetscFree(vstr);
 24:   return(0);
 25: }

 29: /*@C
 30:     PetscViewerStringSPrintf - Prints information to a PetscViewer string.

 32:     Collective on PetscViewer (Hmmm, each processor maintains a separate string)

 34:     Input Parameters:
 35: +   v - a string PetscViewer, formed by PetscViewerStringOpen()
 36: -   format - the format of the input

 38:     Level: developer

 40:     Fortran Note:
 41:     This routine is not supported in Fortran.

 43:    Concepts: printing^to string

 45: .seealso: PetscViewerStringOpen()
 46: @*/
 47: PetscErrorCode  PetscViewerStringSPrintf(PetscViewer viewer,const char format[],...)
 48: {
 49:   va_list            Argp;
 50:   size_t             shift;
 51:   PetscErrorCode     ierr;
 52:   PetscTruth         isstring;
 53:   char               tmp[4096];
 54:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;

 59:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_STRING,&isstring);
 60:   if (!isstring) return(0);
 61:   if (!vstr->string) SETERRQ(PETSC_ERR_ORDER,"Must call PetscViewerStringSetString() before using");

 63:   va_start(Argp,format);
 64:   PetscVSNPrintf(tmp,4096,format,Argp);
 65:   va_end(Argp);

 67:   PetscStrlen(tmp,&shift);
 68:   if (shift >= vstr->maxlen - vstr->curlen - 1) shift = vstr->maxlen - vstr->curlen - 1;
 69:   PetscStrncpy(vstr->head,tmp,shift);

 71:   vstr->head   += shift;
 72:   vstr->curlen += shift;
 73:   return(0);
 74: }

 78: /*@C
 79:     PetscViewerStringOpen - Opens a string as a PetscViewer. This is a very 
 80:     simple PetscViewer; information on the object is simply stored into 
 81:     the string in a fairly nice way.

 83:     Collective on MPI_Comm

 85:     Input Parameters:
 86: +   comm - the communicator
 87: -   string - the string to use

 89:     Output Parameter:
 90: .   lab - the PetscViewer

 92:     Level: advanced

 94:     Fortran Note:
 95:     This routine is not supported in Fortran.

 97:   Concepts: PetscViewerString^creating

 99: .seealso: PetscViewerDestroy(), PetscViewerStringSPrintf()
100: @*/
101: PetscErrorCode  PetscViewerStringOpen(MPI_Comm comm,char string[],PetscInt len,PetscViewer *lab)
102: {
104: 
106:   PetscViewerCreate(comm,lab);
107:   PetscViewerSetType(*lab,PETSC_VIEWER_STRING);
108:   PetscViewerStringSetString(*lab,string,len);
109:   return(0);
110: }

114: PetscErrorCode PetscViewerGetSingleton_String(PetscViewer viewer,PetscViewer *sviewer)
115: {
116:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;
117:   PetscErrorCode     ierr;

120:   PetscViewerStringOpen(PETSC_COMM_SELF,vstr->head,vstr->maxlen-vstr->curlen,sviewer);
121:   return(0);
122: }

126: PetscErrorCode PetscViewerRestoreSingleton_String(PetscViewer viewer,PetscViewer *sviewer)
127: {
128:   PetscErrorCode     ierr;
129:   PetscViewer_String *iviewer = (PetscViewer_String*)(*sviewer)->data;
130:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;

133:   vstr->head    = iviewer->head;
134:   vstr->curlen += iviewer->curlen;
135:   PetscViewerDestroy(*sviewer);
136:   return(0);
137: }

142: PetscErrorCode  PetscViewerCreate_String(PetscViewer v)
143: {
144:   PetscViewer_String *vstr;
145:   PetscErrorCode     ierr;

148:   v->ops->destroy          = PetscViewerDestroy_String;
149:   v->ops->view             = 0;
150:   v->ops->flush            = 0;
151:   v->ops->getsingleton     = PetscViewerGetSingleton_String;
152:   v->ops->restoresingleton = PetscViewerRestoreSingleton_String;
153:   PetscNew(PetscViewer_String,&vstr);
154:   v->data                  = (void*)vstr;
155:   vstr->string             = 0;
156:   return(0);
157: }

162: /*@C

164:    PetscViewerStringSetString - sets the string that a string viewer will print to

166:    Collective on PetscViewer

168:   Input Parameters:
169: +   viewer - string viewer you wish to attach string to
170: .   string - the string to print data into
171: -   len - the length of the string

173:   Level: advanced

175: .seealso: PetscViewerStringOpen()
176: @*/
177: PetscErrorCode  PetscViewerStringSetString(PetscViewer viewer,char string[],PetscInt len)
178: {
179:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;
180:   PetscErrorCode     ierr;
181:   PetscTruth         isstring;

186:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_STRING,&isstring);
187:   if (!isstring)  return(0);
188:   if (len <= 2) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"String must have length at least 2");

190:   PetscMemzero(string,len*sizeof(char));
191:   vstr->string      = string;
192:   vstr->head        = string;
193:   vstr->curlen      = 0;
194:   vstr->maxlen      = len;
195:   return(0);
196: }