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LSPUTRF.C
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1989-08-30
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101 lines
/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "lsputrf.c 1.1 - 89/07/03" */
#include <blkio.h>
#include <errno.h>
#include "lseq_.h"
/*man---------------------------------------------------------------------------
NAME
lsputrf - put field to current lseq record
SYNOPSIS
#include <lseq.h>
int lsputrf(lsp, offset, buf, bufsize)
lseq_t *lsp;
size_t offset;
void *buf;
size_t bufsize;
DESCRIPTION
The lsputrf function writes the contents of buf into a field in the
current record in lseq lsp. 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.
lsputrf 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 0.
[LSEBOUND] offset + bufsize extends beyond the end
of the record.
[LSELOCK] lsp is not write locked.
[LSENOPEN] lsp is not open.
[LSENREC] The cursor is null.
SEE ALSO
lscursor, lsgetrf, lsputr.
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 lsputrf(lsp, offset, buf, bufsize)
lseq_t * lsp;
size_t offset;
void * buf;
size_t bufsize;
{
int rs = 0;
errno = 0;
/* 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 write locked */
if (!(lsp->flags & LSWRLCK)) {
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 == 0) {
errno = LSENREC;
return -1;
}
/* copy field to current record */
memcpy((void *)((char *)lsp->clsrp->recbuf + offset), buf, bufsize);
/* write field */
rs = ls_rcputf(lsp, lsp->clspos, offset, buf, bufsize);
if (rs == -1) {
LSEPRINT;
return -1;
}
errno = 0;
return 0;
}