Add missing API calls, provide testsuite

1 files changed, 54 insertions, 0 deletions

diff --git a/getc.c b/getc.c
new file mode 100644
index 0000000..3c203d9
--- /dev/null
+++ b/getc.c
@@ -0,0 +1,54 @@
+/* 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;
+}
+