ICU-20075 For POSIX, increase correctedPOSIXLocale size for localeID expansion with...

diff --git a/icu4c/source/common/putil.cpp b/icu4c/source/common/putil.cpp
index bc3fbb9ba6217355b30dd6558780244b1e62e957..c4e61e23782de8d03c10b1992b367601e2216c7a 100644 (file)
--- a/icu4c/source/common/putil.cpp
+++ b/icu4c/source/common/putil.cpp
@@ -1668,7 +1668,8 @@ The leftmost codepage (.xxx) wins.
     /* Note that we scan the *uncorrected* ID. */
     if ((p = uprv_strrchr(posixID, '@')) != NULL) {
         if (correctedPOSIXLocale == NULL) {
-            correctedPOSIXLocale = static_cast<char *>(uprv_malloc(uprv_strlen(posixID)+1));
+            /* new locale can be 1 char longer than old one if @ -> __ */
+            correctedPOSIXLocale = static_cast<char *>(uprv_malloc(uprv_strlen(posixID)+2));
             /* Exit on memory allocation error. */
             if (correctedPOSIXLocale == NULL) {
                 return NULL;
@@ -1685,7 +1686,7 @@ The leftmost codepage (.xxx) wins.
         }
 
         if (uprv_strchr(correctedPOSIXLocale,'_') == NULL) {
-            uprv_strcat(correctedPOSIXLocale, "__"); /* aa@b -> aa__b */
+            uprv_strcat(correctedPOSIXLocale, "__"); /* aa@b -> aa__b (note this can make the new locale 1 char longer) */
         }
         else {
             uprv_strcat(correctedPOSIXLocale, "_"); /* aa_CC@b -> aa_CC_b */