fdelrec - Delete record in ISAM file (record I/O)

Definition	#include <stdio.h> int fdelrec(FILE *fp, void *key); fdelrec deletes the record with the key value key from an ISAM file with record I/O.
Parameters	FILE *fp File pointer of an ISAM file which was opened in the mode “type=record,forg=key” (cf. fopen/fopen64, freopen/freopen64). void *key Pointer to an area which contains the key value of the record to be deleted in its complete length or NULL. If key is equal to NULL, the last record read is deleted. The record must have been read immediately prior to the fdelrec call.
Returnwert	0	If the record with the specified key was deleted.
	>0	If the record to be deleted does not exist.
	EOF	If an error has occurred.
Notes	If the call was error-free (return values 0 or > 0) the EOF flag of the file is reset. If the specified key value is not present in the file (return value > 0) the current position of the read/write pointer remains unchanged. Sole exception: if, at the time of the fdelrec call, the file is positioned on the second or higher key of a group of records with identical keys, then fdelrec positions the file on the first record after this group. In ISAM files with key duplication fdelrec deletes the first record with the specified key. The file is then positioned on the next record (with the same key or the next higher key).
See also	flocate, fopen, fopen64, freopen, freopen64