Mostly automatic incremental link enabling

tools/win/supalink/supalink.cpp

Index: tools/win/supalink/supalink.cpp
diff --git a/tools/win/supalink/supalink.cpp b/tools/win/supalink/supalink.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0c6bd878ddcf8d4282e5397ba913095360495976
--- /dev/null
+++ b/tools/win/supalink/supalink.cpp
@@ -0,0 +1,211 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+
+using namespace std;
+
+// Don't use stderr for errors because VS has large buffers on them, leading
+// to confusing error output.
+static void Fatal(const char* msg)
+{

[jam, 2011/09/27 22:10:34]

nit: brace bracket after function, see style guide

+    fprintf(stdout, "supalink fatal error: %s\n", msg);
+    exit(1);
+}
+
+static string ErrorMessageToString(DWORD err)
+{
+    LPTSTR msgBuf = NULL;

[jam, 2011/09/27 22:10:34]

msg_buf (see style guide)

+    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+            NULL,
+            err,
+            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+            (LPTSTR)&msgBuf,
+            0,
+            NULL);
+    string ret(msgBuf);
+    LocalFree(msgBuf);
+    return ret;
+}
+
+
+static void Fallback(const char* msg = 0)
+{
+    if (msg)
+    {
+        fprintf(stdout,
+                "supalink failed (%s), trying to fallback to standard link.\n",
+                msg);
+        fprintf(stdout, "Original command line: %s\n", GetCommandLine());
+        fflush(stdout);
+    }
+
+    STARTUPINFO startupInfo = { sizeof(STARTUPINFO) };
+    PROCESS_INFORMATION processInfo;
+    DWORD exitCode;
+
+    string origCmd(GetCommandLine());
+
+    const char* searchFor[] = {
+        "link.exe\" ",
+        "LINK.EXE\" ",
+        "link.EXE\" ",
+        "link\" ",
+        "LINK\" ",
+        "link.exe ",
+        "LINK.EXE ",
+        "link.EXE ",
+        "link ",
+        "LINK ",
+    };
+    string cmd;
+    string replaceWith = "link.exe.supalink_orig.exe";
+    for (size_t i = 0; i < sizeof(searchFor) / sizeof(searchFor[0]); ++i)
+    {
+        string linkexe = searchFor[i];
+        string::size_type at = origCmd.find(linkexe, 0);
+        if (at == string::npos)
+            continue;
+        if (linkexe[linkexe.size() - 2] == '"')
+            replaceWith += "\" ";
+        else
+            replaceWith += " ";
+        cmd = origCmd.replace(at, linkexe.size(), replaceWith);
+        break;
+    }
+    if (cmd == "")
+    {
+        fprintf(stdout, "Original run '%s'\n", origCmd.c_str());
+        Fatal("Couldn't find link.exe (or similar) in command line");
+    }
+
+    if (getenv("SUPALINK_DEBUG"))
+    {
+        fprintf(stdout, "  running '%s'\n", cmd.c_str());
+        fflush(stdout);
+    }
+    if (!CreateProcess(NULL,
+                       (LPSTR)cmd.c_str(),
+                       NULL,
+                       NULL,
+                       TRUE,
+                       0,
+                       NULL,
+                       NULL,
+                       &startupInfo, &processInfo))
+    {
+        string error = ErrorMessageToString(GetLastError());
+        Fatal(error.c_str());
+    }
+    WaitForSingleObject(processInfo.hProcess, INFINITE);
+    GetExitCodeProcess(processInfo.hProcess, &exitCode);
+    CloseHandle(processInfo.hProcess);
+    CloseHandle(processInfo.hThread);
+    exit(exitCode);
+}
+
+wstring SlurpFile(const char* path)
+{
+    FILE* f = fopen(path, "rb, ccs=UNICODE");
+    if (!f) Fallback("couldn't read file");
+    fseek(f, 0, SEEK_END);
+    long len = ftell(f);
+    rewind(f);
+    wchar_t* data = (wchar_t*)malloc(len);

[jam, 2011/09/27 22:10:34]

use reinterpret_cast (see style guide)

+    fread(data, 1, len, f);
+    fclose(f);
+    wstring ret(data, len/sizeof(wchar_t));
+    free(data);
+    return ret;
+}
+
+void DumpFile(const char* path, wstring& contents)
+{
+    FILE* f = fopen(path, "wb, ccs=UTF-16LE");
+    if (!f) Fallback("couldn't write file");
+
+    fwrite(contents.c_str(), sizeof(wchar_t), contents.size(), f);
+    if (ferror(f)) Fatal("failed during response rewrite");
+    fclose(f);
+}
+
+// Input command line is assumed to be of the form:
+//
+// link.exe @C:\src\...\RSP00003045884740.rsp /NOLOGO /ERRORREPORT:PROMPT
+//
+// Specifically, we parse & hack the contents of argv[1] and pass the rest
+// onwards.
+//
+// %REALLINK%.supalink_orig.exe
+int main(int argc, char** argv)
+{
+    ULONGLONG startTime = 0, endTime;
+    //fprintf(stderr, "GetCommandLine(): '%s'\n", GetCommandLine());
+    //fflush(stderr);
+
+    int rspFileIndex = -1;
+
+    if (argc < 2)
+        Fallback("too few commmand line args");
+
+    for (int i = 1; i < argc; ++i)
+    {
+        if (argv[i][0] == '@')
+        {
+            rspFileIndex = i;
+            break;
+        }
+    }
+
+    if (rspFileIndex == -1)
+        Fallback("couldn't find a response file in argv");
+
+    if (getenv("SUPALINK_DEBUG"))
+        startTime = GetTickCount64();
+
+    wstring rsp = SlurpFile(&argv[rspFileIndex][1]);
+
+    // The first line of this file is all we try to fix. It's a bunch of
+    // quoted space separated items. Simplest thing seems to be replacing " "
+    // with "\n". So, just slurp the file, replace, spit it out to the same
+    // file and continue on our way.
+
+    // Took about .5s when using the naive .replace loop to replace " " with
+    // "\r\n" so write the silly loop instead.
+    wstring fixed;
+    fixed.reserve(rsp.size() * 2);
+
+    for (const wchar_t* s = rsp.c_str(); *s;)
+    {
+        if (*s == '"' && *(s + 1) == ' ' && *(s + 2) == '"')
+        {
+            fixed += L"\"\r\n\"";
+            s += 3;
+        }
+        else
+        {
+            fixed += *s++;
+        }
+    }
+
+    DumpFile(&argv[rspFileIndex][1], fixed);
+
+    if (getenv("SUPALINK_DEBUG"))
+    {
+        string backupCopy(&argv[rspFileIndex][1]);
+        backupCopy += ".copy";
+        DumpFile(backupCopy.c_str(), fixed);
+
+        endTime = GetTickCount64();
+
+        fprintf(stdout,
+                "  took %.2fs to modify @rsp file\n",
+                (endTime - startTime) / 1000.0);
+    }
+
+    Fallback();
+}