From ab400c0be5577cab2a66d242183887ebbd61717f Mon Sep 17 00:00:00 2001
From: Nicholas <nbnoll@eml.cc>
Date: Wed, 17 Nov 2021 08:22:03 -0800
Subject: checkin

---
 src/cmd/rc/exec.c | 74 ++++++++++++++++++++++++++-----------------------------
 1 file changed, 35 insertions(+), 39 deletions(-)

(limited to 'src/cmd/rc/exec.c')

diff --git a/src/cmd/rc/exec.c b/src/cmd/rc/exec.c
index 51e352a..bd68bf5 100644
--- a/src/cmd/rc/exec.c
+++ b/src/cmd/rc/exec.c
@@ -36,8 +36,7 @@ struct Builtin builtin[]={
 
 /* words and lists */
 
-static
-void
+static void
 pushword(char *str)
 {
     if(!runner->args)
@@ -46,8 +45,7 @@ pushword(char *str)
     runner->args->word = makeword(str, runner->args->word);
 }
 
-static
-void
+static void
 popword(void)
 {
     Word *w;
@@ -63,8 +61,7 @@ popword(void)
     efree(w);
 }
 
-static
-Word*
+static Word*
 copywords(Word *a, Word *tail)
 {
     Word *v = nil, **end;
@@ -76,8 +73,7 @@ copywords(Word *a, Word *tail)
     return v;
 }
 
-static
-void
+static void
 freewords(Word *w)
 {
     Word *n;
@@ -89,8 +85,7 @@ freewords(Word *w)
     }
 }
 
-static
-void
+static void
 freelist(Word *w)
 {
     Word *n;
@@ -100,7 +95,6 @@ freelist(Word *w)
         efree(w);
         w = n;
     }
-
 }
 
 static void
@@ -154,7 +148,7 @@ path(char *w)
     if(strncmp(w, "/", 1)==0
     || strncmp(w, "./", 2)==0
     || strncmp(w, "../", 3)==0
-    || (path = var("path")->val)==0)
+    || !(path = var("path")->val))
         path=&nullpath;
 
     return path;
@@ -262,7 +256,7 @@ xforkx(void)
         initchild(runner, 1);
         pushword("exec");
         xx();
-        exit(2); // reach here on failed execs
+        exit(errno); // reach here on failed execs
         break;
     default: // parent
         initparent(runner, pid, 0);
@@ -505,7 +499,7 @@ xcd(void)
 
 static Code dotcmd[14] =
 {
-    [0]  = {.i = 0},
+    [0]  = {.i = 1},    // offset by 1 to ensure it never gets freed
     [1]  = {.f = Xmark},
     [2]  = {.f = Xword},
     [3]  = {.s = "0"},
@@ -557,7 +551,7 @@ xdot(void)
     }
 
     if(fd<0){
-        print(shell.err, "failed open: %s: ", base);
+        print(shell.err, "%s: ", base);
         setstatus("failed open");
         Xerror(".: failed open");
         return;
@@ -626,41 +620,43 @@ xfg(void)
     foreground(job, 1);
 }
 
+static Code bootstrap[32] =
+{
+    [0]  = {.i = 1},
+    [1]  = {.f = Xmark},
+    [2]  = {.f = Xword},
+    [3]  = {.s = "*"},
+    [4]  = {.f = Xassign},
+    [5]  = {.f = Xmark},
+    [6]  = {.f = Xmark},
+    [7]  = {.f = Xword},
+    [8]  = {.s = "*"},
+    [9]  = {.f = Xdollar},
+    [10] = {.f = Xword},
+    [11] = {.s = nil}, /* XXX: to be filled in by caller */
+    [12] = {.f = Xword},
+    [13] = {.s = "."},
+    [14] = {.f = Xbasic},
+    [15] = {.f = Xexit},
+    [16] = {.i = 0}
+};
+
 void
-xboot(int argc, char *argv[])
+xboot(char *exe, int argc, char *argv[])
 {
     int i;
-    Code bootstrap[32];
     char num[12];
 
-    i = 0;
-    bootstrap[i++].i = 1;
-    bootstrap[i++].f = Xmark;
-    bootstrap[i++].f = Xword;
-    bootstrap[i++].s="*";
-    bootstrap[i++].f = Xassign;
-    bootstrap[i++].f = Xmark;
-    bootstrap[i++].f = Xmark;
-    bootstrap[i++].f = Xword;
-    bootstrap[i++].s="*";
-    bootstrap[i++].f = Xdollar;
-    bootstrap[i++].f = Xword;
-    bootstrap[i++].s = "./cmds"; /* /dev/stdin"; */
-    bootstrap[i++].f = Xword;
-    bootstrap[i++].s=".";
-    bootstrap[i++].f = Xbasic;
-    bootstrap[i++].f = Xexit;
-    bootstrap[i].i = 0;
-
+    bootstrap[11].s = exe;
     run(bootstrap, 1, nil, 0);
     runner->pid = runner->pgid = shell.pid;
     pushlist(); // prime bootstrap argv
 
-    argv0 = strdup(argv[0]);
-    for(i = argc-1; i > 0; --i)
+    /* initialize $* */
+    for(i = argc-1; i >= 0; --i)
         pushword(argv[i]);
 
-    /* main interpreter loop */
+    /* main loop */
     for(;;){
         runner->code.i++;
         (*runner->code.exe[runner->code.i-1].f)();
-- 
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