From 8faa85ac19e1bbbe962d69b283c94526e35f5338 Mon Sep 17 00:00:00 2001
From: Carter Sande <carter.sande@duodecima.technology>
Date: Mon, 22 Jun 2020 02:45:23 -0700
Subject: [PATCH] ArgIteratorWindows: don't treat unclosed quotes like they're
 escaped

---
 lib/std/process.zig | 31 +++----------------------------
 1 file changed, 3 insertions(+), 28 deletions(-)

diff --git a/lib/std/process.zig b/lib/std/process.zig
index a65f6da3af..57b7888e19 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -282,7 +282,6 @@ pub const ArgIteratorWindows = struct {
     index: usize,
     cmd_line: [*]const u8,
     in_quote: bool,
-    quote_count: usize,
     seen_quote_count: usize,
 
     pub const NextError = error{OutOfMemory};
@@ -296,7 +295,6 @@ pub const ArgIteratorWindows = struct {
             .index = 0,
             .cmd_line = cmd_line,
             .in_quote = false,
-            .quote_count = countQuotes(cmd_line),
             .seen_quote_count = 0,
         };
     }
@@ -342,7 +340,7 @@ pub const ArgIteratorWindows = struct {
                     backslash_count += 1;
                 },
                 ' ', '\t' => {
-                    if (self.seen_quote_count % 2 == 0 or self.seen_quote_count == self.quote_count) {
+                    if (self.seen_quote_count % 2 == 0) {
                         return true;
                     }
                     backslash_count = 0;
@@ -371,9 +369,6 @@ pub const ArgIteratorWindows = struct {
 
                     if (quote_is_real) {
                         self.seen_quote_count += 1;
-                        if (self.seen_quote_count == self.quote_count and self.seen_quote_count % 2 == 1) {
-                            try buf.append('"');
-                        }
                     } else {
                         try buf.append('"');
                     }
@@ -384,7 +379,7 @@ pub const ArgIteratorWindows = struct {
                 ' ', '\t' => {
                     try self.emitBackslashes(&buf, backslash_count);
                     backslash_count = 0;
-                    if (self.seen_quote_count % 2 == 1 and self.seen_quote_count != self.quote_count) {
+                    if (self.seen_quote_count % 2 == 1) {
                         try buf.append(byte);
                     } else {
                         return buf.toOwnedSlice();
@@ -405,26 +400,6 @@ pub const ArgIteratorWindows = struct {
             try buf.append('\\');
         }
     }
-
-    fn countQuotes(cmd_line: [*]const u8) usize {
-        var result: usize = 0;
-        var backslash_count: usize = 0;
-        var index: usize = 0;
-        while (true) : (index += 1) {
-            const byte = cmd_line[index];
-            switch (byte) {
-                0 => return result,
-                '\\' => backslash_count += 1,
-                '"' => {
-                    result += 1 - (backslash_count % 2);
-                    backslash_count = 0;
-                },
-                else => {
-                    backslash_count = 0;
-                },
-            }
-        }
-    }
 };
 
 pub const ArgIterator = struct {
@@ -578,7 +553,7 @@ test "windows arg parsing" {
     testWindowsCmdLine("a\\\\\\b d\"e f\"g h", &[_][]const u8{ "a\\\\\\b", "de fg", "h" });
     testWindowsCmdLine("a\\\\\\\"b c d", &[_][]const u8{ "a\\\"b", "c", "d" });
     testWindowsCmdLine("a\\\\\\\\\"b c\" d e", &[_][]const u8{ "a\\\\b c", "d", "e" });
-    testWindowsCmdLine("a   b\tc \"d f", &[_][]const u8{ "a", "b", "c", "\"d", "f" });
+    testWindowsCmdLine("a   b\tc \"d f", &[_][]const u8{ "a", "b", "c", "d f" });
 
     testWindowsCmdLine("\".\\..\\zig-cache\\build\" \"bin\\zig.exe\" \".\\..\" \".\\..\\zig-cache\" \"--help\"", &[_][]const u8{
         ".\\..\\zig-cache\\build",