Refactor textmessage/textclient with channel creation around ancil_*

1 files changed, 47 insertions, 0 deletions

diff --git a/src/libunixonacid/textmessage_recv_channel.c b/src/libunixonacid/textmessage_recv_channel.c
new file mode 100644
index 0000000..69adbcf
--- /dev/null
+++ b/src/libunixonacid/textmessage_recv_channel.c
@@ -0,0 +1,47 @@
+/* ISC license. */
+
+#include <sys/uio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <skalibs/allreadwrite.h>
+#include <skalibs/error.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-timed.h>
+#include <skalibs/ancil.h>
+#include <skalibs/textmessage.h>
+#include <skalibs/posixishard.h>
+
+static int getfd (void *p)
+{
+  return ((int *)p)[0] ;
+}
+
+static ssize_t get (void *p)
+{
+  int *fd = p ;
+  int r = ancil_recv_fd(fd[0], '|') ;
+  if (r < 0) return error_isagain(errno) ? (errno = 0, 0) : r ;
+  fd[1] = r ;
+  return 1 ;
+}
+  
+int textmessage_recv_channel (int sock, textmessage_receiver_t *asyncin, char *asyncbuf, size_t asyncbufsize, char const *after, size_t afterlen, tain_t const *deadline, tain_t *stamp)
+{
+  struct iovec v ;
+  int fd[2] = { sock, -1 } ;
+  ssize_t r = timed_get(fd, &getfd, &get, deadline, stamp) ;
+  if (!r) errno = EPIPE ;
+  if (r <= 0) return 0 ;
+  textmessage_receiver_init(asyncin, fd[1], asyncbuf, asyncbufsize, TEXTMESSAGE_MAXLEN) ;
+  if (sanitize_read(textmessage_timed_receive(asyncin, &v, deadline, stamp)) <= 0) goto serr ;
+  if (v.iov_len != afterlen || memcmp(v.iov_base, after, afterlen)) goto berr ;
+  return 1 ;
+
+ berr:
+  errno = EPROTO ;
+ serr:
+  textmessage_receiver_free(asyncin) ;
+  fd_close(fd[1]) ;
+  return 0 ;
+}