1 files changed, 48 insertions, 0 deletions

diff --git a/pathexec_run.c b/pathexec_run.c
new file mode 100644
index 0000000..1770ac7
--- /dev/null
+++ b/pathexec_run.c
@@ -0,0 +1,48 @@
+/* Public domain. */
+
+#include "error.h"
+#include "stralloc.h"
+#include "str.h"
+#include "env.h"
+#include "pathexec.h"
+
+static stralloc tmp;
+
+void pathexec_run(const char *file,const char * const *argv,const char * const *envp)
+{
+  const char *path;
+  unsigned int split;
+  int savederrno;
+
+  if (file[str_chr(file,'/')]) {
+    execve(file,argv,envp);
+    return;
+  }
+
+  path = env_get("PATH");
+  if (!path) path = "/bin:/usr/bin";
+
+  savederrno = 0;
+  for (;;) {
+    split = str_chr(path,':');
+    if (!stralloc_copyb(&tmp,path,split)) return;
+    if (!split)
+      if (!stralloc_cats(&tmp,".")) return;
+    if (!stralloc_cats(&tmp,"/"))  return;
+    if (!stralloc_cats(&tmp,file)) return;
+    if (!stralloc_0(&tmp)) return;
+
+    execve(tmp.s,argv,envp);
+    if (errno != error_noent) {
+      savederrno = errno;
+      if ((errno != error_acces) && (errno != error_perm) && (errno != error_isdir)) return;
+    }
+
+    if (!path[split]) {
+      if (savederrno) errno = savederrno;
+      return;
+    }
+    path += split;
+    path += 1;
+  }
+}