Category : C Source Code
Archive   : CDBDEV.ZIP
Filename : DATAFILE.C
#include
#include "cdata.h"
#define flocate(r,l) ((long)(sizeof(FHEADER)+(((r)-1)*(l))))
static int handle [MXFILS];
FHEADER fh [MXFILS];
/* --------- create a file ----------- */
void file_create(name, len)
char *name;
int len;
{
int fp;
FHEADER hd;
#if COMPILER == MICROSOFT
extern int _iomode;
_iomode = 0x8000;
#endif
#if COMPILER == LATTICE
extern int _iomode;
_iomode = 0x8000;
#endif
unlink(name);
fp = creat(name, CMODE);
close(fp);
fp = open(name, OPENMODE);
hd.next_record = 1;
hd.first_record = 0;
hd.record_length = len;
write(fp, (char *) &hd, sizeof hd);
close(fp);
}
/* -------------- open a file ---------------- */
int file_open(name)
char *name;
{
int fp;
#if COMPILER == MICROSOFT
extern int _iomode;
_iomode = 0x8000;
#endif
#if COMPILER == LATTICE
extern int _iomode;
_iomode = 0x8000;
#endif
for (fp = 0; fp < MXFILS; fp++)
if (handle [fp] == 0)
break;
if (fp == MXFILS)
return ERROR;
if ((handle [fp] = open(name, OPENMODE)) == ERROR)
return ERROR;
lseek(handle [fp], 0L, 0);
read(handle [fp], (char *) &fh [fp], sizeof(FHEADER));
return fp;
}
/* --------------- close a file ----------------- */
void file_close(fp)
int fp;
{
lseek(handle [fp], 0L, 0);
write(handle [fp], (char *) &fh [fp], sizeof(FHEADER));
close(handle [fp]);
handle [fp] = 0;
}
/* -------------- create a new record ------------- */
RPTR new_record(fp, bf)
int fp;
char *bf;
{
RPTR rcdno;
extern char *malloc();
FHEADER *c;
extern int free();
if (fh [fp].first_record) {
rcdno = fh [fp].first_record;
if ((c = (FHEADER *)
malloc(fh [fp].record_length)) == NULL) {
errno = D_OM;
dberror();
}
get_record(fp, rcdno, c);
fh [fp].first_record = c->next_record;
free(c);
}
else
rcdno = fh [fp].next_record++;
put_record(fp, rcdno, bf);
return rcdno;
}
/* ---------------- retrieve a record -------------- */
int get_record(fp, rcdno, bf)
int fp;
RPTR rcdno;
char *bf;
{
if (rcdno >= fh [fp].next_record)
return ERROR;
lseek(handle [fp],
flocate(rcdno, fh [fp].record_length), 0);
read(handle [fp], bf, fh [fp].record_length);
return OK;
}
/* ---------------- rewrite a record -------------- */
int put_record(fp, rcdno, bf)
int fp;
RPTR rcdno;
char *bf;
{
if (rcdno > fh [fp].next_record)
return ERROR;
lseek(handle [fp],
flocate(rcdno, fh [fp].record_length), 0);
write(handle [fp], bf, fh [fp].record_length);
return OK;
}
/* -------------- delete a record ---------------- */
int delete_record(fp, rcdno)
int fp;
RPTR rcdno;
{
FHEADER *bf;
extern char *malloc();
if (rcdno > fh [fp].next_record)
return ERROR;
if ((bf = (FHEADER *)
malloc(fh [fp].record_length)) == NULL) {
errno = D_OM;
dberror();
}
set_mem(bf, fh [fp].record_length, '\0');
bf->next_record = fh [fp].first_record;
bf->first_record = -1;
fh [fp].first_record = rcdno;
put_record(fp, rcdno, bf);
free(bf);
return OK;
}
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This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/