From be5697562cc87c7d1281ad5752ddf30ae9d2ce79 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Wed, 11 Sep 2019 04:07:36 -0500
Subject: Add q123 exit code, add Q, fix "sed ' ! '" bad error message.

---
 toys/posix/sed.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/toys/posix/sed.c b/toys/posix/sed.c
index 979a6eb8..d958ab70 100644
--- a/toys/posix/sed.c
+++ b/toys/posix/sed.c
@@ -461,11 +461,14 @@ static void sed_line(char **pline, long plen)
       char *l = (c=='P') ? strchr(line, '\n') : 0;
 
       if (emit(line, l ? l-line : len, eol)) break;
-    } else if (c=='q') {
+    } else if (c=='q' || c=='Q') {
       if (pline) *pline = (void *)1;
       free(TT.nextline);
+      if (!toys.exitval && command->arg1)
+        toys.exitval = atoi(command->arg1+(char *)command);
       TT.nextline = 0;
       TT.nextlen = 0;
+      if (c=='Q') line = 0;
 
       break;
     } else if (c=='s') {
@@ -826,7 +829,7 @@ static void parse_pattern(char **pline, long len)
 
     c = command->c = *(line++);
     if (strchr("}:", c) && i) break;
-    if (strchr("aiqr=", c) && i>1) break;
+    if (strchr("aiqQr=", c) && i>1) break;
 
     // Allocate memory and copy out of toybuf now that we know how big it is
     command = xmemdup(toybuf, reg-toybuf);
@@ -953,7 +956,7 @@ writenow:
       if (len != strlen(s)) goto error;
       reg = extend_string((void *)&command, s, reg-(char*)command, len);
       free(s);
-    } else if (strchr("abcirtTw:", c)) {
+    } else if (strchr("abcirtTqQw:", c)) {
       int end;
 
       // trim leading spaces
@@ -964,12 +967,20 @@ writenow:
 resume_a:
       command->hit = 0;
 
-      // btT: end with space or semicolon, aicrw continue to newline.
-      if (!(end = strcspn(line, strchr(":btT", c) ? "}; \t\r\n\v\f" : "\n"))) {
-        // Argument's optional for btT
+      // btTqQ: end with space or semicolon, aicrw continue to newline.
+      if (!(end = strcspn(line, strchr(":btTqQ", c) ? "}; \t\r\n\v\f" : "\n"))){
+        // Argument's optional for btTqQ
         if (strchr("btT", c)) continue;
         else if (!command->arg1) break;
       }
+      // Error checking: qQ can only have digits after them
+      if (c=='q' || c=='Q') {
+        for (i = 0; i<end && isdigit(line[i]); i++);
+        if (i != end) {
+          line += i;
+          break;
+        }
+      }
 
       // Extend allocation to include new string. We use offsets instead of
       // pointers so realloc() moving stuff doesn't break things. Ok to write
@@ -1007,7 +1018,7 @@ resume_a:
       } else line += end;
 
     // Commands that take no arguments
-    } else if (!strchr("{dDgGhHlnNpPqx=", c)) break;
+    } else if (!strchr("{dDgGhHlnNpPx=", c)) break;
   }
 
 error:
-- 
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