From bd18d4584aae0ed6f7111ef5713784cf29fe663f Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Sat, 8 Jan 2011 05:28:38 +0000
Subject: [PATCH] Add printf format string parsing support for ' prefix to
 format conversions (POSIX extension).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123054 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/Analysis/Analyses/FormatString.h | 9 +++++++--
 lib/Analysis/PrintfFormatString.cpp            | 6 +++++-
 test/Sema/format-strings.c                     | 6 ++++++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/include/clang/Analysis/Analyses/FormatString.h b/include/clang/Analysis/Analyses/FormatString.h
index 280b1260ac..cc1d3427e7 100644
--- a/include/clang/Analysis/Analyses/FormatString.h
+++ b/include/clang/Analysis/Analyses/FormatString.h
@@ -379,6 +379,7 @@ using analyze_format_string::OptionalAmount;
 using analyze_format_string::OptionalFlag;
 
 class PrintfSpecifier : public analyze_format_string::FormatSpecifier {
+  OptionalFlag HasThousandsGrouping; // ''', POSIX extension.
   OptionalFlag IsLeftJustified; // '-'
   OptionalFlag HasPlusPrefix; // '+'
   OptionalFlag HasSpacePrefix; // ' '
@@ -388,8 +389,8 @@ class PrintfSpecifier : public analyze_format_string::FormatSpecifier {
 public:
   PrintfSpecifier() :
     FormatSpecifier(/* isPrintf = */ true),
-    IsLeftJustified("-"), HasPlusPrefix("+"), HasSpacePrefix(" "),
-    HasAlternativeForm("#"), HasLeadingZeroes("0") {}
+    HasThousandsGrouping("'"), IsLeftJustified("-"), HasPlusPrefix("+"),
+    HasSpacePrefix(" "), HasAlternativeForm("#"), HasLeadingZeroes("0") {}
 
   static PrintfSpecifier Parse(const char *beg, const char *end);
 
@@ -397,6 +398,10 @@ public:
   void setConversionSpecifier(const PrintfConversionSpecifier &cs) {
     CS = cs;
   }
+  void setHasThousandsGrouping(const char *position) {
+    HasThousandsGrouping = true;
+    HasThousandsGrouping.setPosition(position);
+  }
   void setIsLeftJustified(const char *position) {
     IsLeftJustified = true;
     IsLeftJustified.setPosition(position);
diff --git a/lib/Analysis/PrintfFormatString.cpp b/lib/Analysis/PrintfFormatString.cpp
index ff688e07d3..d99de2215d 100644
--- a/lib/Analysis/PrintfFormatString.cpp
+++ b/lib/Analysis/PrintfFormatString.cpp
@@ -100,6 +100,10 @@ static PrintfSpecifierResult ParsePrintfSpecifier(FormatStringHandler &H,
   for ( ; I != E; ++I) {
     switch (*I) {
       default: hasMore = false; break;
+      case '\'': 
+        // FIXME: POSIX specific.  Always accept?
+        FS.setHasThousandsGrouping(I);
+        break;
       case '-': FS.setIsLeftJustified(I); break;
       case '+': FS.setHasPlusPrefix(I); break;
       case ' ': FS.setHasSpacePrefix(I); break;
@@ -185,7 +189,7 @@ static PrintfSpecifierResult ParsePrintfSpecifier(FormatStringHandler &H,
     case 's': k = ConversionSpecifier::sArg;      break;
     case 'u': k = ConversionSpecifier::uArg; break;
     case 'x': k = ConversionSpecifier::xArg; break;
-    // Mac OS X (unicode) specific
+    // POSIX specific.
     case 'C': k = ConversionSpecifier::CArg; break;
     case 'S': k = ConversionSpecifier::SArg; break;
     // Objective-C.
diff --git a/test/Sema/format-strings.c b/test/Sema/format-strings.c
index c51dafdae5..93b6eb52b2 100644
--- a/test/Sema/format-strings.c
+++ b/test/Sema/format-strings.c
@@ -331,3 +331,9 @@ void pr8641() {
   printf("%#x\n", 10);
   printf("%#X\n", 10);
 }
+
+void posix_extensions() {
+  // Test %'d, "thousands grouping".
+  // <rdar://problem/8816343>
+  printf("%'d\n", 123456789); // no-warning
+}
-- 
2.40.0