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Frostbyte's 1980s DOS Shareware Collection
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LSEQ.ZIP
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LSGETCUR.C
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1989-08-30
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "lsgetcur.c 1.1 - 89/07/03" */
#include <blkio.h>
#include <errno.h>
/* #include <string.h> */
#include "lseq_.h"
/*man---------------------------------------------------------------------------
NAME
lsgetcur - get lseq cursor
SYNOPSIS
#include <lseq.h>
int lsgetcur(lsp, lspos_p)
lseq_t *lsp;
lspos_t *lspos_p;
DESCRIPTION
The lsgetcur function gets the current cursor position of lseq lsp and
copies it to the location pointed to by lspos_p. A lseq position saved
with lsgetcur can be used to reposition to a record using lssetcur. It
is important to remember that an lseq position saved with lsgetcur is
not valid after that lseq has been unlocked.
lsgetcur will fail if one or more of the following is true:
[EINVAL] lsp is not a valid lseq pointer.
[EINVAL] lspos_p is the NULL pointer.
[LSELOCK] lsp is not locked.
[LSENOPEN] lsp is not open.
SEE ALSO
lssetcur.
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 lsgetcur(lsp, lspos_p)
lseq_t * lsp;
lspos_t * lspos_p;
{
errno = 0;
/* validate arguments */
if ((!ls_valid(lsp)) || (lspos_p == NULL)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(lsp->flags & LSOPEN)) {
errno = EINVAL;
return -1;
}
/* check if not read locked */
if (!(lsp->flags & LSLOCKS)) {
errno = LSELOCK;
return -1;
}
/* get current position */
memcpy((void *)lspos_p, (void *)&lsp->clspos, sizeof(lsp->clspos));
errno = 0;
return 0;
}