make fgetc return the char value as unsigned (in a signed int)

2 files changed, 15 insertions, 1 deletions

diff --git a/src/library.js b/src/library.js
index 2472e701..4b7b755b 100644
--- a/src/library.js
+++ b/src/library.js
@@ -2852,7 +2852,7 @@ LibraryManager.library = {
       streamObj.error = true;
       return -1;
     } else {
-      return {{{ makeGetValue('_fgetc.ret', '0', 'i8') }}};
+      return {{{ makeGetValue('_fgetc.ret', '0', 'i8', null, 1) }}};
     }
   },
   getc: 'fgetc',
diff --git a/tests/runner.py b/tests/runner.py
index ed9bcdd5..e9c9018b 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -3954,6 +3954,20 @@ def process(filename):
         '''
       self.do_run(src, 'isatty? 0,0,1\ngot: 35\ngot: 45\ngot: 25\ngot: 15\n', post_build=post)
 
+    def test_fgetc_unsigned(self):
+      if self.emcc_args is None: return self.skip('requires emcc')
+      src = r'''
+        #include <stdio.h>
+        int main() {
+          FILE *file = fopen("file_with_byte_234.txt", "rb");
+          int c = fgetc(file);
+          printf("*%d\n", c);
+        }
+      '''
+      open('file_with_byte_234.txt', 'wb').write('\xea')
+      self.emcc_args += ['--embed-file', 'file_with_byte_234.txt']
+      self.do_run(src, '*234\n')
+
     def test_folders(self):
       add_pre_run = '''
 def process(filename):