---

Fojoin (3FML)

Name

Fojoin, Fojoin32-outer join source into destination buffer

#include <stdio.h>  
#include "fml.h" 
 
int  
Fojoin(FBFR *dest, FBFR *src)  
 
#include "fml32.h"  
 
int  
Fojoin32(FBFR32 *dest, FBFR32 *src)

Description

Fojoin() is similar to Fjoin(3), but it keeps fields from the destination buffer, dest, that have no corresponding fieldid/occurrence in the source buffer, src. Fields that exist in the source buffer that have no corresponding fieldid/occurrence in the destination buffer are not added to the destination buffer.

As with Fjoin(3), this function can fail for lack of space; it can be re-issued again after allocating more space to complete the operation.

Fojoin32 is used with 32-bit FML.

Return Values

This function returns \-1 on error and sets Ferror to indicate the error condition.

Errors

Under the following conditions, Fojoin() fails and sets Ferror to:

[FALIGNERR]

"fielded buffer not aligned"
Either the source buffer or the destination buffer does not begin on the proper boundary.

[FNOTFLD]

"buffer not fielded"
Either the source buffer or the destination buffer is not a fielded buffer or has not been initialized by Finit().

[FNOSPACE]

"no space in fielded buffer"
A field value is to be added or changed in a field buffer but there is not enough space remaining in the buffer.

Example

In the following example,

if(Fojoin(dest,src)  0)
  F_error("pgm_name");

if dest has fields A, B, and two occurrences of C, and src has fields A, C, and D, the resultant dest will contain the source field value A, the destination field value B,the source field value C, and the second destination field value C.

See Also

Fintro(3), Fconcat(3), Fjoin(3), Fproj(3)

---

---