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Fread (3FML)

Name

Fread, Fread32-read fielded buffer

Synopsis

#include <stdio.h>  
#include "fml.h"  
 
int  
Fread(FBFR *fbfr, FILE *iop)  
 
#include "fml32.h"  
 
int  
Fread32(FBFR32 *fbfr, FILE32 *iop)

Description

Fielded buffers may be read from file streams using Fread(). fbfr is a pointer to a fielded buffer. iop is a pointer of type FILE to the input stream. (See stdio(3S) in a UNIX System reference manual for a discussion of streams). Fread() reads the fielded buffer from the stream into fbfr, clearing any data previously stored in the buffer, and recreates the buffer's index.

Fread32 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, Fread() fails and sets Ferror to:

[FALIGNERR]

"fielded buffer not aligned"
The buffer does not begin on the proper boundary.

[FNOTFLD]

"buffer not fielded"
The buffer is not a fielded buffer or has not been initialized by Finit(). This error is also returned if the data that is read is not a fielded buffer.

[FNOSPACE]

"no space in fielded buffer"
There is not enough space in the buffer to hold the fielded buffer being read from the stream.

[FEUNIX]

"UNIX system call error"
The read() system call failed. The external integer errno should have been set to indicate the error by the system call.

Portability

This function is not supported using the TUXEDO System /WS DLL for OS/2 and Microsoft Windows.

See Also

Fintro(3), stdio(3S) in UNIX System reference manuals, Findex(3), Fwrite(3)

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