commit cd41cba82a3b5707718aabc2e62ec33f8ba23cfe
author Andrew Paprocki <andrew@ishiboo.com> Mon Nov 11 19:46:05 2019 -0500
committer Yoshito Umaoka <yumaoka@users.noreply.github.com> Wed Feb 12 12:45:12 2020 -0500
tree fa0c72ff8c4f07feca92b8bfc7f66f07e5f151c4
parent 6ea0fc771393e05ca5232dbf2274ed8ceca4262a

ICU-20895 ICU_TIMEZONE_FILES_DIR_PREFIX_ENV_VAR

Adds `ICU_TIMEZONE_FILES_DIR_PREFIX_ENV_VAR`, similar to
`ICU_DATA_DIR_PREFIX_ENV_VAR`, that specifies an environment variable
to retrieve and prepend to the ICU time zone data file path.

icu4c/source/common/putil.cpp

diff --git a/icu4c/source/common/putil.cpp b/icu4c/source/common/putil.cpp
index acb9022..0f3c795 100644
--- a/icu4c/source/common/putil.cpp
+++ b/icu4c/source/common/putil.cpp
@@ -1459,6 +1459,11 @@
 
     const char *dir = "";
 
+#if defined(ICU_TIMEZONE_FILES_DIR_PREFIX_ENV_VAR)
+    char timezonefilesdir_path_buffer[PATH_MAX];
+    const char *prefix = getenv(ICU_TIMEZONE_FILES_DIR_PREFIX_ENV_VAR);
+#endif
+
 #if U_PLATFORM_HAS_WINUWP_API == 1
 // The UWP version does not support the environment variable setting.
 
@@ -1485,6 +1490,13 @@
         dir = "";
     }
 
+#if defined(ICU_TIMEZONE_FILES_DIR_PREFIX_ENV_VAR)
+    if (prefix != NULL) {
+        snprintf(timezonefilesdir_path_buffer, PATH_MAX, "%s%s", prefix, dir);
+        dir = timezonefilesdir_path_buffer;
+    }
+#endif
+
     setTimeZoneFilesDir(dir, status);
 }