Improve byte reading from stdin

2 files changed, 19 insertions, 1 deletions

diff --git a/fgetc.c b/fgetc.c
index 95f7fd1..cf755d8 100644
--- a/fgetc.c
+++ b/fgetc.c
@@ -28,7 +28,23 @@ static long next_buffer_pos = 0; /* Next free position in the getc buffer. */
 int
 my_fgetc(FILE * input)
 {
-  return (next_buffer_pos > 0) ? getc_buffer[--next_buffer_pos] : fgetc(input);
+  int c;
+
+  if (next_buffer_pos > 0)
+    return getc_buffer[--next_buffer_pos];
+  else
+  {
+    errno = 0;
+    c     = fgetc(input);
+
+    while (c == EOF && errno == EAGAIN)
+    {
+      errno = 0;
+      c     = fgetc(input);
+    }
+
+    return c;
+  }
 }
 
 /* =============================== */
diff --git a/fgetc.h b/fgetc.h
index eae2f7b..9e2d53b 100644
--- a/fgetc.h
+++ b/fgetc.h
@@ -9,6 +9,8 @@
 #ifndef FGETC_H
 #define FGETC_H
 
+#include <errno.h>
+
 int
 my_fgetc(FILE * input);