1 files changed, 59 insertions, 0 deletions
diff --git a/src/execline/heredoc.c b/src/execline/heredoc.c
new file mode 100644
index 0000000..899c2d8
--- /dev/null
+++ b/src/execline/heredoc.c
@@ -0,0 +1,59 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/uint.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+
+#define USAGE "heredoc [ -d ] fd string command..."
+#define dieusage() strerr_dieusage(100, USAGE)
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  int df = 0 ;
+  PROG = "heredoc" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "d", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'd' : df = 1 ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+  if (argc < 3) dieusage() ;
+  {
+    int fd[2] ;
+    unsigned int fdr ;
+    int pid ;
+    if (!uint0_scan(argv[0], &fdr)) strerr_dieusage(100, USAGE) ;
+    if (pipe(fd) < 0) strerr_diefu1sys(111, "pipe") ;
+    pid = df ? doublefork() : fork() ;
+    switch (pid)
+    {
+      case -1: strerr_diefu2sys(111, df ? "double" : "", "fork") ;
+      case 0:
+      {
+        unsigned int len = str_len(argv[1]) ;
+        PROG = "heredoc (child)" ;
+        fd_close(fd[0]) ;
+        if (allwrite(fd[1], argv[1], len) < len)
+          strerr_diefu1sys(111, "allwrite") ;
+        return 0 ;
+      }
+    }
+    fd_close(fd[1]) ;
+    if (fd_move((int)fdr, fd[0]) == -1)
+      strerr_diefu2sys(111, "read on fd ", argv[0]) ;
+  }
+  pathexec_run(argv[2], argv+2, envp) ;
+  strerr_dieexec(111, argv[2]) ;
+}