1 files changed, 90 insertions, 0 deletions
diff --git a/preline.c b/preline.c
new file mode 100644
index 0000000..1a4cef8
--- /dev/null
+++ b/preline.c
@@ -0,0 +1,90 @@
+#include "fd.h"
+#include "sgetopt.h"
+#include "readwrite.h"
+#include "strerr.h"
+#include "substdio.h"
+#include "exit.h"
+#include "fork.h"
+#include "wait.h"
+#include "env.h"
+#include "sig.h"
+#include "error.h"
+
+#define FATAL "preline: fatal: "
+
+void die_usage()
+{
+  strerr_die1x(100,"preline: usage: preline cmd [ arg ... ]");
+}
+
+int flagufline = 1; char *ufline;
+int flagrpline = 1; char *rpline;
+int flagdtline = 1; char *dtline;
+
+char outbuf[SUBSTDIO_OUTSIZE];
+char inbuf[SUBSTDIO_INSIZE];
+substdio ssout = SUBSTDIO_FDBUF(write,1,outbuf,sizeof outbuf);
+substdio ssin = SUBSTDIO_FDBUF(read,0,inbuf,sizeof inbuf);
+
+void main(argc,argv)
+int argc;
+char **argv;
+{
+  int opt;
+  int pi[2];
+  int pid;
+  int wstat;
+ 
+  sig_pipeignore();
+ 
+  if (!(ufline = env_get("UFLINE"))) die_usage();
+  if (!(rpline = env_get("RPLINE"))) die_usage();
+  if (!(dtline = env_get("DTLINE"))) die_usage();
+ 
+  while ((opt = getopt(argc,argv,"frdFRD")) != opteof)
+    switch(opt) {
+      case 'f': flagufline = 0; break;
+      case 'r': flagrpline = 0; break;
+      case 'd': flagdtline = 0; break;
+      case 'F': flagufline = 1; break;
+      case 'R': flagrpline = 1; break;
+      case 'D': flagdtline = 1; break;
+      default: die_usage();
+    }
+  argc -= optind;
+  argv += optind;
+  if (!*argv) die_usage();
+ 
+  if (pipe(pi) == -1)
+    strerr_die2sys(111,FATAL,"unable to create pipe: ");
+
+  pid = fork();
+  if (pid == -1)
+    strerr_die2sys(111,FATAL,"unable to fork: ");
+
+  if (pid == 0) {
+    close(pi[1]);
+    if (fd_move(0,pi[0]) == -1)
+      strerr_die2sys(111,FATAL,"unable to set up fds: ");
+    sig_pipedefault();
+    execvp(*argv,argv);
+    strerr_die4sys(error_temp(errno) ? 111 : 100,FATAL,"unable to run ",*argv,": ");
+  }
+  close(pi[0]);
+  if (fd_move(1,pi[1]) == -1)
+    strerr_die2sys(111,FATAL,"unable to set up fds: ");
+ 
+  if (flagufline) substdio_bputs(&ssout,ufline);
+  if (flagrpline) substdio_bputs(&ssout,rpline);
+  if (flagdtline) substdio_bputs(&ssout,dtline);
+  if (substdio_copy(&ssout,&ssin) != 0)
+    strerr_die2sys(111,FATAL,"unable to copy input: ");
+  substdio_flush(&ssout);
+  close(1);
+ 
+  if (wait_pid(&wstat,pid) == -1)
+    strerr_die2sys(111,FATAL,"wait failed: ");
+  if (wait_crashed(wstat))
+    strerr_die2x(111,FATAL,"child crashed");
+  _exit(wait_exitcode(wstat));
+}