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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 <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "runcap.h"
int
runcap_getc(struct runcap *rc, int stream, char *cp)
{
struct filecapture *fp;
if (!cp) {
errno = EINVAL;
return -1;
}
fp = runcap_filecapture(rc, stream);
if (!fp)
return -1;
if (fp->fc_level == fp->fc_linestart) {
if (fp->fc_tmpfd != -1) {
ssize_t r = read(fp->fc_tmpfd, fp->fc_base,
fp->fc_size);
if (r < 0)
return -1;
else if (r == 0)
return 0;
fp->fc_level = r;
fp->fc_linestart = 0;
} else {
return 0;
}
}
*cp = fp->fc_base[fp->fc_linestart++];
return 1;
}
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