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/* runcap - run program and capture its output
Copyright (C) 2017 Sergey Poznyakoff
Runcap is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Runcap is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with Runcap. If not, see <http://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include "runcap.h"
off_t
runcap_seek(struct runcap *rc, int sd, off_t off, int whence)
{
struct stream_capture *cap;
off_t cur;
cap = runcap_get_capture(rc, sd);
if (!cap)
return -1;
cur = runcap_tell(rc, sd);
switch (whence) {
case SEEK_CUR:
off = cur + off;
break;
case SEEK_END:
off = cap->sc_leng + off;
break;
case SEEK_SET:
break;
default:
errno = EINVAL;
return -1;
}
if (off < 0) {
errno = EINVAL;
return -1;
}
cur -= cap->sc_cur;
if (cur <= off && off <= cur + cap->sc_level) {
cap->sc_cur = off - cur;
} else if (cap->sc_storfd != -1) {
if (lseek(cap->sc_storfd, off, SEEK_SET) == -1)
return -1;
cap->sc_level = 0;
cap->sc_cur = 0;
} else {
errno = EINVAL;
return -1;
}
return off;
}
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