From 3713ea0f1a8841f3af5b628f8c14b09d04ee7c49 Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@cryptonector.com>
Date: Wed, 6 Sep 2023 08:52:37 -0500
Subject: [PATCH] Add setlocale() call (fix #1740)

---
 configure.ac |  1 +
 src/main.c   |  7 +++++++
 tests/shtest | 13 +++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9e8830bf41..4a72465979 100644
--- a/configure.ac
+++ b/configure.ac
@@ -149,6 +149,7 @@ AC_CHECK_MEMBER([struct tm.tm_gmtoff], [AC_DEFINE([HAVE_TM_TM_GMT_OFF],1,[Define
                 [], [[#include <time.h>]])
 AC_CHECK_MEMBER([struct tm.__tm_gmtoff], [AC_DEFINE([HAVE_TM___TM_GMT_OFF],1,[Define to 1 if the system has the __tm_gmt_off field in struct tm])],
                 [], [[#include <time.h>]])
+AC_FIND_FUNC([setlocale], [c], [#include <locale.h>], [0,0])
 
 dnl Figure out if we have the pthread functions we actually need
 AC_FIND_FUNC_NO_LIBS([pthread_key_create], [], [#include <pthread.h>], [NULL, NULL])
diff --git a/src/main.c b/src/main.c
index 2348b94df1..9c6b3cf75a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,6 +2,9 @@
 #include <ctype.h>
 #include <errno.h>
 #include <libgen.h>
+#ifdef HAVE_SETLOCALE
+#include <locale.h>
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -319,6 +322,10 @@ int main(int argc, char* argv[]) {
   jv ARGS = jv_array(); /* positional arguments */
   jv program_arguments = jv_object(); /* named arguments */
 
+#ifdef HAVE_SETLOCALE
+  (void) setlocale(LC_ALL, "");
+#endif
+
 #ifdef WIN32
   jv_tsd_dtoa_ctx_init();
   fflush(stdout);
diff --git a/tests/shtest b/tests/shtest
index 52a82190d0..ebba413e9e 100755
--- a/tests/shtest
+++ b/tests/shtest
@@ -561,4 +561,17 @@ if ! $VALGRIND $Q $JQ -n -f "$JQTESTDIR/yes-main-program.jq" > $d/out 2>&1; then
   exit 1
 fi
 
+if locale -a > /dev/null; then
+  locale=$(locale | egrep -v '^(C|POSIX|en)' | egrep -i 'utf8|utf-8' | head)
+  if [[ -z $locale ]]; then
+    echo "WARNING: Not testing localization"
+  else
+    date=$(LC_ALL="$locale" date +"%a %d %b %Y at %H:%M:%S")
+    if ! LC_ALL="$locale" ./jq -nRe --arg date "$date" '$date|strptime("%a %d %b %Y at %H:%M:%S")? // false'; then
+      echo "jq does not honor LC_ALL environment variable"
+      exit 1;
+    fi
+  fi
+fi
+
 exit 0