:orphan:
# PetscVSNPrintf
The PETSc version of `vsnprintf()`. Ensures that all `%g` formatted arguments' output contains the decimal point (which is used by the test harness) 
## Synopsis
```
PetscErrorCode PetscVSNPrintf(char *str, size_t len, const char *format, size_t *fullLength, va_list Argp)
```

## Input Parameters

- ***str -*** location to put result
- ***len -*** the length of `str`
- ***format -*** the PETSc format string



## Output Parameter

- ***fullLength -*** the amount of space in `str` actually used.





## Developer Note
This function may be called from an error handler, if an error occurs when it is called by the error handler than likely
a recursion will occur resulting in a crash of the program.

If the length of the format string `format` is on the order of `PETSCDEFAULTBUFFERSIZE` (8 * 1024 bytes) or larger, this function will call `PetscMalloc()`


## See Also
 `PetscFormatConvert()`, `PetscFormatConvertGetSize()`, `PetscVSNPrintf()`, `PetscErrorPrintf()`, `PetscVPrintf()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/fileio/mprint.c.html#PetscVSNPrintf">src/sys/fileio/mprint.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/fileio/mprint.c)


[Index of all Sys routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)