From a2cd46a5f342553c05ae6ef4e7a73069df0e1be1 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Fri, 3 Jan 2020 03:10:17 -0600
Subject: Add MAYFORK to "help", teach it to behave differently when called as
 a builtin, and add -u.

---
 lib/help.c | 11 ++++++++---
 lib/lib.c  |  2 +-
 lib/lib.h  |  3 ++-
 3 files changed, 11 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/help.c b/lib/help.c
index 7b97e8b9..86d6392b 100644
--- a/lib/help.c
+++ b/lib/help.c
@@ -16,10 +16,10 @@ static char *help_data =
 #include "generated/newtoys.h"
 ;
 
-void show_help(FILE *out)
+void show_help(FILE *out, int full)
 {
   int i = toys.which-toy_list;
-  char *s;
+  char *s, *ss;
 
   if (CFG_TOYBOX_HELP) {
     for (;;) {
@@ -30,6 +30,11 @@ void show_help(FILE *out)
       i = toy_find(++s)-toy_list;
     }
 
-    fprintf(out, "%s\n", s);
+    if (full) fprintf(out, "%s\n", s);
+    else {
+      strstart(&s, "usage: ");
+      for (ss = s; *ss && *ss!='\n'; ss++);
+      fprintf(out, "%.*s\n", (int)(ss-s), s);
+    }
   }
 }
diff --git a/lib/lib.c b/lib/lib.c
index 2250caf4..26ba546f 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -72,7 +72,7 @@ void help_exit(char *msg, ...)
 {
   va_list va;
 
-  if (!msg) show_help(stdout);
+  if (!msg) show_help(stdout, 1);
   else {
     va_start(va, msg);
     verror_msg(msg, -1, va);
diff --git a/lib/lib.h b/lib/lib.h
index 5ec648c8..398d261d 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -55,6 +55,7 @@ struct num_cache *add_num_cache(struct num_cache **cache, long long num,
 
 // args.c
 #define FLAGS_NODASH (1LL<<63)
+#define FLAGS_BUILTIN (1LL<<62)
 void get_optflags(void);
 
 // dirtree.c
@@ -107,7 +108,7 @@ struct dirtree *dirtree_read(char *path, int (*callback)(struct dirtree *node));
 
 // help.c
 
-void show_help(FILE *out);
+void show_help(FILE *out, int full);
 
 // Tell xopen and friends to print warnings but return -1 as necessary
 // The largest O_BLAH flag so far is arch/alpha's O_PATH at 0x800000 so
-- 
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