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Frostbyte's 1980s DOS Shareware Collection
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LSEQ.ZIP
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LSLAST.C
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1989-08-30
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "lslast.c 1.1 - 89/07/03" */
#include <errno.h>
#include "lseq_.h"
/*man---------------------------------------------------------------------------
NAME
lslast - last lseq record
SYNOPSIS
#include <lseq.h>
int lslast(lsp)
lseq_t *lsp;
DESCRIPTION
The lslast function positions the cursor of lseq lsp on the last
record in that lseq.
lslast will fail if one or more of the following is true:
[EINVAL] lsp is not a valid lseq pointer.
[LSELOCK] lsp is not locked.
[LSENOPEN] lsp is not open.
[LSENREC] lsp is empty.
SEE ALSO
lsfirst, lsnext, lsprev, lsreccnt.
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 lslast(lsp)
lseq_t *lsp;
{
int rs = 0;
errno = 0;
/* validate arguments */
if (!ls_valid(lsp)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(lsp->flags & LSOPEN)) {
errno = LSENOPEN;
return -1;
}
/* check locks */
if (!(lsp->flags & LSLOCKS)) {
errno = LSELOCK;
return -1;
}
/* check if lsp is empty */
if (lsp->lshdr.reccnt == 0) {
errno = LSENREC;
return -1;
}
/* check if already on last record */
if (lsp->clspos == lsp->lshdr.last) {
errno = 0;
return 0;
}
/* set cursor to last record */
lsp->clspos = lsp->lshdr.last;
/* read in last record */
if (lsp->clspos == 0) {
LSEPRINT;
errno = LSEPANIC;
return -1;
} else {
rs = ls_rcget(lsp, lsp->clspos, lsp->clsrp);
if (rs == -1) {
LSEPRINT;
return -1;
}
}
errno = 0;
return 0;
}