[sql] Rewrite sqlite patching "system".

third_party/sqlite/patches/0009-Custom-shell.c-helpers-to-load-Chromium-s-ICU-data.patch

+From c9842fae7d9dea4f309a736939af9ea68d4b41fb Mon Sep 17 00:00:00 2001
+From: Scott Hess <shess@chromium.org>
+Date: Tue, 16 Dec 2014 13:03:21 -0800
+Subject: [PATCH 09/24] Custom shell.c helpers to load Chromium's ICU data.
+
+History uses fts3 with an icu-based segmenter.  These changes allow building a
+sqlite3 binary for Linux or Windows which can read those files.
+---
+ third_party/sqlite/src/Makefile.linux-gcc    |  7 ++++++
+ third_party/sqlite/src/main.mk               |  2 +-
+ third_party/sqlite/src/src/shell.c           | 10 +++++++++
+ third_party/sqlite/src/src/shell_icu_linux.c | 27 +++++++++++++++++++++++
+ third_party/sqlite/src/src/shell_icu_win.c   | 32 ++++++++++++++++++++++++++++
+ 5 files changed, 77 insertions(+), 1 deletion(-)
+ create mode 100644 third_party/sqlite/src/src/shell_icu_linux.c
+ create mode 100644 third_party/sqlite/src/src/shell_icu_win.c
+
+diff --git a/third_party/sqlite/src/Makefile.linux-gcc b/third_party/sqlite/src/Makefile.linux-gcc
+index e631816..f60f1a1 100644
+--- a/third_party/sqlite/src/Makefile.linux-gcc
++++ b/third_party/sqlite/src/Makefile.linux-gcc
+@@ -86,6 +86,13 @@ OPTS += -DOS_UNIX=1
+ # purposes.
+ OPTS += -DDEFAULT_ENABLE_RECOVER=1
+ 
++# Support for loading Chromium ICU data in sqlite3.
++ifeq ($(shell uname -s),Darwin)
++SHELL_ICU =
++else
++SHELL_ICU = $(TOP)/src/shell_icu_linux.c -licuuc
++endif
++
+ #### The suffix to add to executable files.  ".exe" for windows.
+ #    Nothing for unix.
+ #
+diff --git a/third_party/sqlite/src/main.mk b/third_party/sqlite/src/main.mk
+index 65dd690..d20103f 100644
+--- a/third_party/sqlite/src/main.mk
++++ b/third_party/sqlite/src/main.mk
+@@ -358,7 +358,7 @@ libsqlite3.a:       $(LIBOBJ)
+ 
+ sqlite3$(EXE): $(TOP)/src/shell.c libsqlite3.a sqlite3.h
+        $(TCCX) $(READLINE_FLAGS) -o sqlite3$(EXE)                  \
+-               $(TOP)/src/shell.c                                  \
++               $(TOP)/src/shell.c $(SHELL_ICU)                     \
+                libsqlite3.a $(LIBREADLINE) $(TLIBS) $(THREADLIB)
+ 
+ # This target creates a directory named "tsrc" and fills it with
+diff --git a/third_party/sqlite/src/src/shell.c b/third_party/sqlite/src/src/shell.c
+index aab70b2..ffb4698 100644
+--- a/third_party/sqlite/src/src/shell.c
++++ b/third_party/sqlite/src/src/shell.c
+@@ -2663,6 +2663,16 @@ int main(int argc, char **argv){
+   int i;
+   int rc = 0;
+ 
++  /* Begin evanm patch. */
++#if !defined(__APPLE__)
++  extern int sqlite_shell_init_icu();
++  if( !sqlite_shell_init_icu() ){
++    fprintf(stderr, "%s: warning: couldn't find icudt38.dll; "
++                    "queries against ICU FTS tables will fail.\n", argv[0]);
++  }
++#endif /* !defined(__APPLE__) */
++  /* End evanm patch. */
++
+   Argv0 = argv[0];
+   main_init(&data);
+   stdin_is_interactive = isatty(0);
+diff --git a/third_party/sqlite/src/src/shell_icu_linux.c b/third_party/sqlite/src/src/shell_icu_linux.c
+new file mode 100644
+index 0000000..4ad0e42
+--- /dev/null
++++ b/third_party/sqlite/src/src/shell_icu_linux.c
+@@ -0,0 +1,27 @@
++/* Copyright 2007 Google Inc. All Rights Reserved.
++**/
++
++#include <limits.h>
++#include <unistd.h>
++#include "unicode/putil.h"
++#include "unicode/udata.h"
++
++/*
++** This function attempts to load the ICU data tables from a data file.
++** Returns 0 on failure, nonzero on success.
++** This a hack job of icu_utils.cc:Initialize().  It's Chrome-specific code.
++*/
++int sqlite_shell_init_icu() {
++  char bin_dir[PATH_MAX + 1];
++  int bin_dir_size = readlink("/proc/self/exe", bin_dir, PATH_MAX);
++  if (bin_dir_size < 0 || bin_dir_size > PATH_MAX)
++    return 0;
++  bin_dir[bin_dir_size] = 0;;
++
++  u_setDataDirectory(bin_dir);
++  // Only look for the packaged data file;
++  // the default behavior is to look for individual files.
++  UErrorCode err = U_ZERO_ERROR;
++  udata_setFileAccess(UDATA_ONLY_PACKAGES, &err);
++  return err == U_ZERO_ERROR;
++}
+diff --git a/third_party/sqlite/src/src/shell_icu_win.c b/third_party/sqlite/src/src/shell_icu_win.c
+new file mode 100644
+index 0000000..67ebbf4
+--- /dev/null
++++ b/third_party/sqlite/src/src/shell_icu_win.c
+@@ -0,0 +1,32 @@
++/* Copyright 2011 Google Inc. All Rights Reserved.
++**/
++
++#include <windows.h>
++#include "unicode/udata.h"
++
++/*
++** This function attempts to load the ICU data tables from a DLL.
++** Returns 0 on failure, nonzero on success.
++** This a hack job of icu_utils.cc:Initialize().  It's Chrome-specific code.
++*/
++
++#define ICU_DATA_SYMBOL "icudt" U_ICU_VERSION_SHORT "_dat"
++int sqlite_shell_init_icu() {
++  HMODULE module;
++  FARPROC addr;
++  UErrorCode err;
++
++  // Chrome dropped U_ICU_VERSION_SHORT from the icu data dll name.
++  module = LoadLibrary(L"icudt.dll");
++  if (!module)
++    return 0;
++
++  addr = GetProcAddress(module, ICU_DATA_SYMBOL);
++  if (!addr)
++    return 0;
++
++  err = U_ZERO_ERROR;
++  udata_setCommonData(addr, &err);
++
++  return 1;
++}
+-- 
+2.2.1
+