Make try_fgetc() prepend clearerr() for fgetc() versions that need it.

[plomrogue] / src / common / readwrite.h

diff --git a/src/common/readwrite.h b/src/common/readwrite.h
index d616a193a31f95f9982ea7242f97e041ee4b9d50..b61230fb59487ba05f0feed3a05de66bb0ab0dcb 100644 (file)
--- a/src/common/readwrite.h
+++ b/src/common/readwrite.h
@@ -22,7 +22,9 @@ extern void try_fputc(uint8_t c, FILE * file, char * f);
 
 /* Wrapper to calling fgetc() and fgets() from function "f". The return code is
  * returned unless ferror() indicates an error (i.e. to signify an end of file,
- * fgetc() may return an EOF and fgets() a NULL.
+ * fgetc() may return an EOF and fgets() a NULL). try_fgetc() calls clearerr()
+ * on "file" before fgetc(), because some Unixes fgetc() remember old EOFs and
+ * only return those until explicitely cleared.
  */
 extern int try_fgetc(FILE * file, char * f);
 extern char * try_fgets(char * line, int size, FILE * file, char * f);