2: #include <petsc-private/viewerimpl.h>   /*I  "petscsys.h"  I*/

  4: typedef struct  {
  5:   char   *string;         /* string where info is stored */
  6:   char   *head;           /* pointer to begining of unused portion */
  7:   size_t curlen,maxlen;
  8: } PetscViewer_String;

 12: static PetscErrorCode PetscViewerDestroy_String(PetscViewer viewer)
 13: {
 14:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;
 15:   PetscErrorCode     ierr;

 18:   PetscFree(vstr);
 19:   return(0);
 20: }

 24: /*@C
 25:     PetscViewerStringSPrintf - Prints information to a PetscViewer string.

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

 29:     Input Parameters:
 30: +   v - a string PetscViewer, formed by PetscViewerStringOpen()
 31: -   format - the format of the input

 33:     Level: developer

 35:     Fortran Note:
 36:     This routine is not supported in Fortran.

 38:    Concepts: printing^to string

 40: .seealso: PetscViewerStringOpen()
 41: @*/
 42: PetscErrorCode  PetscViewerStringSPrintf(PetscViewer viewer,const char format[],...)
 43: {
 44:   va_list            Argp;
 45:   size_t             fullLength;
 46:   size_t             shift;
 47:   PetscErrorCode     ierr;
 48:   PetscBool          isstring;
 49:   char               tmp[4096];
 50:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;

 55:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERSTRING,&isstring);
 56:   if (!isstring) return(0);
 57:   if (!vstr->string) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ORDER,"Must call PetscViewerStringSetString() before using");

 59:   va_start(Argp,format);
 60:   PetscVSNPrintf(tmp,4096,format,&fullLength,Argp);
 61:   va_end(Argp);

 63:   PetscStrlen(tmp,&shift);
 64:   if (shift >= vstr->maxlen - vstr->curlen - 1) shift = vstr->maxlen - vstr->curlen - 1;
 65:   PetscStrncpy(vstr->head,tmp,shift);

 67:   vstr->head   += shift;
 68:   vstr->curlen += shift;
 69:   return(0);
 70: }

 74: /*@C
 75:     PetscViewerStringOpen - Opens a string as a PetscViewer. This is a very
 76:     simple PetscViewer; information on the object is simply stored into
 77:     the string in a fairly nice way.

 79:     Collective on MPI_Comm

 81:     Input Parameters:
 82: +   comm - the communicator
 83: .   string - the string to use
 84: -   len    - the string length

 86:     Output Parameter:
 87: .   lab - the PetscViewer

 89:     Level: advanced

 91:     Fortran Note:
 92:     This routine is not supported in Fortran.

 94:   Concepts: PetscViewerString^creating

 96: .seealso: PetscViewerDestroy(), PetscViewerStringSPrintf()
 97: @*/
 98: PetscErrorCode  PetscViewerStringOpen(MPI_Comm comm,char string[],PetscInt len,PetscViewer *lab)
 99: {

103:   PetscViewerCreate(comm,lab);
104:   PetscViewerSetType(*lab,PETSCVIEWERSTRING);
105:   PetscViewerStringSetString(*lab,string,len);
106:   return(0);
107: }

111: PetscErrorCode PetscViewerGetSingleton_String(PetscViewer viewer,PetscViewer *sviewer)
112: {
113:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;
114:   PetscErrorCode     ierr;

117:   PetscViewerStringOpen(PETSC_COMM_SELF,vstr->head,vstr->maxlen-vstr->curlen,sviewer);
118:   return(0);
119: }

123: PetscErrorCode PetscViewerRestoreSingleton_String(PetscViewer viewer,PetscViewer *sviewer)
124: {
125:   PetscErrorCode     ierr;
126:   PetscViewer_String *iviewer = (PetscViewer_String*)(*sviewer)->data;
127:   PetscViewer_String *vstr    = (PetscViewer_String*)viewer->data;

130:   vstr->head    = iviewer->head;
131:   vstr->curlen += iviewer->curlen;
132:   PetscViewerDestroy(sviewer);
133:   return(0);
134: }

138: PETSC_EXTERN PetscErrorCode PetscViewerCreate_String(PetscViewer v)
139: {
140:   PetscViewer_String *vstr;
141:   PetscErrorCode     ierr;

144:   v->ops->destroy          = PetscViewerDestroy_String;
145:   v->ops->view             = 0;
146:   v->ops->flush            = 0;
147:   v->ops->getsingleton     = PetscViewerGetSingleton_String;
148:   v->ops->restoresingleton = PetscViewerRestoreSingleton_String;
149:   PetscNewLog(v,PetscViewer_String,&vstr);
150:   v->data                  = (void*)vstr;
151:   vstr->string             = 0;
152:   return(0);
153: }

157: /*@C

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

161:    Logically Collective on PetscViewer

163:   Input Parameters:
164: +   viewer - string viewer you wish to attach string to
165: .   string - the string to print data into
166: -   len - the length of the string

168:   Level: advanced

170: .seealso: PetscViewerStringOpen()
171: @*/
172: PetscErrorCode  PetscViewerStringSetString(PetscViewer viewer,char string[],PetscInt len)
173: {
174:   PetscViewer_String *vstr = (PetscViewer_String*)viewer->data;
175:   PetscErrorCode     ierr;
176:   PetscBool          isstring;

181:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERSTRING,&isstring);
182:   if (!isstring) return(0);
183:   if (len <= 2) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"String must have length at least 2");

185:   PetscMemzero(string,len*sizeof(char));
186:   vstr->string = string;
187:   vstr->head   = string;
188:   vstr->curlen = 0;
189:   vstr->maxlen = len;
190:   return(0);
191: }