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#include "config.h"
#include "err.h"
#include "strutil.h"
#include "tapeio.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <time.h>
#include <unistd.h>
#ifdef NEED_STRINGS
#include <strings.h>
#endif
RCSID("$Id: tapeio.c,v 1.2 2000/02/22 22:50:33 shmit Exp $");
int
mt_rewind(int fd)
{
struct mtop mt;
mt.mt_op = MTREW;
mt.mt_count = 1;
return ioctl(fd, MTIOCTOP, &mt);
}
int
mt_fsf(int fd, int count)
{
struct mtop mt;
mt.mt_op = MTFSF;
mt.mt_count = count;
return ioctl(fd, MTIOCTOP, &mt);
}
int
mt_weof(int fd, int count)
{
struct mtop mt;
mt.mt_op = MTWEOF;
mt.mt_count = count;
return ioctl(fd, MTIOCTOP, &mt);
}
int
readlabel(int fd, tapelabel_t *label)
{
char buffer[HEADERSIZE], date[MAXLINE];
char *p;
struct tm tm;
ssize_t readb;
do {
readb = read(fd, buffer, sizeof(buffer));
if (readb == -1) {
err("Taper: couldn't read label from tape: %s.\n",
strerror(errno));
return -1;
}
} while (readb);
p = getword(buffer, label->labelstr);
getword(p, date);
sscanf(date, "%02d%02d%04d", &tm.tm_mday, &tm.tm_mon, &tm.tm_year);
tm.tm_mon--; tm.tm_year -= 1900; tm.tm_isdst = -1;
label->date = mktime(&tm);
if (mt_fsf(fd, 0) == -1) {
err("Taper: couldn't fast-forward past label: %s.\n",
strerror(errno));
return -1;
}
return 0;
}
int
writelabel(int fd, tapelabel_t *label)
{
char buffer[HEADERSIZE];
struct tm *tm;
int wroteb;
tm = localtime(&label->date);
snprintf(buffer, sizeof(buffer), "%s %02d%02d%04d", label->labelstr,
tm->tm_mday, tm->tm_mon+1, tm->tm_year+1900);
wroteb = write(fd, buffer, sizeof(buffer));
if (wroteb == -1)
return -1;
return mt_weof(fd, 1);
}
int
readheader(int fd, fileheader_t *header)
{
char buffer[HEADERSIZE];
ssize_t readb;
do {
readb = read(fd, buffer, sizeof(buffer));
if (readb == -1)
return -1;
} while (readb);
bzero(header, sizeof(header));
if (!strncmp(TAPER_START, buffer, sizeof(buffer)))
header->type = STARTMARK;
else if (!strncmp(TAPER_STOP, buffer, sizeof(buffer)))
header->type = STOPMARK;
else {
char *vol;
struct tm tm;
header->type = FILEMARK;
vol = index(buffer, ':');
if (vol) {
*vol = '\0';
sscanf(vol+1, "%s %02d%02d%04d", header->vol,
&tm.tm_mday, &tm.tm_mon, &tm.tm_year);
tm.tm_mon--; tm.tm_year -= 1900; tm.tm_isdst = -1;
header->date = mktime(&tm);
}
strncpy(header->host, buffer, sizeof(header->host));
}
return mt_fsf(fd, 0);
}
int
writeheader(int fd, fileheader_t *header)
{
char buffer[HEADERSIZE];
struct tm *tm;
ssize_t wroteb;
switch (header->type) {
case STARTMARK:
strncpy(buffer, TAPER_START, sizeof(buffer));
break;
case STOPMARK:
strncpy(buffer, TAPER_STOP, sizeof(buffer));
break;
case FILEMARK:
tm = localtime(&header->date);
snprintf(buffer, sizeof(buffer), "%s:%s %02d%02d%04d",
header->host, header->vol,
tm->tm_mday, tm->tm_mon+1, tm->tm_year+1900);
break;
}
wroteb = write(fd, buffer, sizeof(buffer));
if (wroteb == -1)
return -1;
return mt_weof(fd, 1);
}
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