do not unconditionally use PATH_MAX with getcwd

Instead, grow a buffer until getcwd either succeeds or fails with an errno different than ERANGE
(meaning the passed buffer was too short to represent the actual path).
Reset errno before calling getcwd to check it eventually did not fail.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/ninja.cc b/src/ninja.cc
index b4797ed..4f77210 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -495,9 +495,13 @@ void EncodeJSONString(const char *str) {
 
 int ToolCompilationDatabase(Globals* globals, int argc, char* argv[]) {
   bool first = true;
-  char cwd[PATH_MAX];
+  vector<char> cwd;
 
-  if (!getcwd(cwd, PATH_MAX)) {
+  do {
+    cwd.resize(cwd.size() + 1024);
+    errno = 0;
+  } while (!getcwd(&cwd[0], cwd.size()) && errno == ERANGE);
+  if (errno != 0 && errno != ERANGE) {
     Error("cannot determine working directory: %s", strerror(errno));
     return 1;
   }
@@ -511,7 +515,7 @@ int ToolCompilationDatabase(Globals* globals, int argc, char* argv[]) {
           putchar(',');
 
         printf("\n  {\n    \"directory\": \"");
-        EncodeJSONString(cwd);
+        EncodeJSONString(&cwd[0]);
         printf("\",\n    \"command\": \"");
         EncodeJSONString((*e)->EvaluateCommand().c_str());
         printf("\",\n    \"file\": \"");