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Cream of the Crop 1
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CBASE102.ARJ
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LSCREATE.C
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1991-09-23
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "@(#)lscreate.c 1.5 - 91/09/23" */
#include <ansi.h>
/* ansi headers */
#include <errno.h>
#ifdef AC_STDDEF
#include <stddef.h>
#endif
#ifdef AC_STRING
#include <string.h>
#endif
/* library headers */
#include <blkio.h>
/* local headers */
#include "lseq_.h"
/*man---------------------------------------------------------------------------
NAME
lscreate - create an lseq
SYNOPSIS
int lscreate(filename, recsize)
const char *filename;
size_t recsize;
DESCRIPTION
The lscreate function creates the file named by filename as an
lseq.
recsize is the size of the records in the lseq.
lscreate will fail if one or more of the following is true:
[EINVAL] filename is the NULL pointer.
[EINVAL] recsize is less than 1.
[LSEMFILE] Too many open lseqs. The maximum
is defined as LSOPEN_MAX in lseq.h.
SEE ALSO
lsopen.
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise,
a value of -1 is returned, and errno set to indicate the error.
------------------------------------------------------------------------------*/
#ifdef AC_PROTO
int lscreate(const char * filename, size_t recsize)
#else
int lscreate(filename, recsize)
const char * filename;
size_t recsize;
#endif
{
int terrno = 0;
lseq_t *lsp = NULL;
/* validate input parameters */
if (filename == NULL || recsize < sizeof(lspos_t)) {
errno = EINVAL;
return -1;
}
/* find free slot in lsb table */
for (lsp = lsb; lsp < (lsb + LSOPEN_MAX); lsp++) {
if (!(lsp->flags & LSOPEN)) {
break; /* found */
}
}
if (lsp >= lsb + LSOPEN_MAX) {
errno = LSEMFILE;
return -1; /* no free slots */
}
/* load lseq_t structure */
lsp->lshdr.flh = NIL;
lsp->lshdr.recsize = recsize;
lsp->lshdr.flags = 0;
lsp->lshdr.first = NIL;
lsp->lshdr.last = NIL;
lsp->lshdr.reccnt = 0;
lsp->bp = NULL;
lsp->flags = LSREAD | LSWRITE;
lsp->clspos = NIL;
lsp->clsrp = NULL;
if (ls_alloc(lsp) == -1) {
LSEPRINT;
memset(lsp, 0, sizeof(*lsb));
lsp->flags = 0;
return -1;
}
/* create file */
lsp->bp = bopen(filename, "c", sizeof(lshdr_t), (size_t)1, (size_t)0);
if (lsp->bp == NULL) {
if (errno != EEXIST) LSEPRINT;
ls_free(lsp);
memset(lsp, 0, sizeof(*lsb));
lsp->flags = 0;
return -1;
}
/* write header to file */
if (bputh(lsp->bp, &lsp->lshdr) == -1) {
LSEPRINT;
terrno = errno;
bclose(lsp->bp);
ls_free(lsp);
memset(lsp, 0, sizeof(*lsb));
lsp->flags = 0;
errno = terrno;
return -1;
}
/* close lsp */
if (lsclose(lsp) == -1) {
LSEPRINT;
ls_free(lsp);
return -1;
}
return 0;
}