home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Shareware - Software Farm 2
/
wosw_2.zip
/
wosw_2
/
CPROG
/
CBASE101.ZIP
/
LSEQ101.ZIP
/
LSGETRF.C
< prev
next >
Wrap
Text File
|
1990-06-20
|
2KB
|
97 lines
/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "@(#)lsgetrf.c 1.4 - 90/06/20" */
/* ansi headers */
#include <errno.h>
/*#include <stddef.h>*/
/*#include <string.h>*/
/* library headers */
#include <blkio.h>
/* local headers */
#include "lseq_.h"
/*man---------------------------------------------------------------------------
NAME
lsgetrf - get field from current lseq record
SYNOPSIS
#include <lseq.h>
int lsgetrf(lsp, offset, buf, bufsize)
lseq_t *lsp;
size_t offset;
void *buf;
size_t bufsize;
DESCRIPTION
The lsgetrf function reads a field from the current record in
lseq lsp into buf. The field begins offset characters from the
beginning of the record and is bufsize characters long. buf must
point to a storage area at least bufsize characters long.
lsgetrf will fail if one or more of the following is true:
[EINVAL] lsp is not a valid lseq pointer.
[EINVAL] buf is the NULL pointer.
[EINVAL] bufsize is less than 1.
[LSEBOUND] offset + bufsize extends beyond the end of the
record.
[LSELOCK] lsp is not read locked.
[LSENOPEN] lsp is not open.
[LSENREC] The cursor is null.
SEE ALSO
lscursor, lsgetr, lsputrf.
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise,
a value of -1 is returned, and errno set to indicate the error.
------------------------------------------------------------------------------*/
int lsgetrf(lsp, offset, buf, bufsize)
lseq_t *lsp;
size_t offset;
void *buf;
size_t bufsize;
{
/* validate arguments */
if (!ls_valid(lsp) || buf == NULL || bufsize < 1) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(lsp->flags & LSOPEN)) {
errno = EINVAL;
return -1;
}
/* check if not read locked */
if (!(lsp->flags & LSRDLCK)) {
errno = LSELOCK;
return -1;
}
/* check if over record boundary */
if (offset + bufsize > lsp->lshdr.recsize) {
errno = LSEBOUND;
return -1;
}
/* check if cursor is null */
if (lsp->clspos == NIL) {
errno = LSENREC;
return -1;
}
/* copy field from current record */
memcpy(buf, (char *)lsp->clsrp->recbuf + offset, bufsize);
errno = 0;
return 0;
}