Warn when fseek or ftell are used.

[gnulib.git] / lib / stdio_.h

diff --git a/lib/stdio_.h b/lib/stdio_.h
index 46ec407..66311be 100644 (file)
--- a/lib/stdio_.h
+++ b/lib/stdio_.h
@@ -24,20 +24,25 @@
 #else
 /* Normal invocation convention.  */
 
-#ifdef __DECC
+#if defined __DECC && __DECC_VER >= 60000000
 # include_next <stdio.h>
 #endif
 
 #ifndef _GL_STDIO_H
 #define _GL_STDIO_H
 
-#ifndef __DECC
+#if !(defined __DECC && __DECC_VER >= 60000000)
 # include @ABSOLUTE_STDIO_H@
 #endif
 
 #include <stdarg.h>
 #include <stddef.h>
 
+#if (@GNULIB_FFLUSH@ && @REPLACE_FFLUSH@) || (@GNULIB_FSEEKO@ && !@HAVE_FSEEKO@) || (@GNULIB_FTELLO@ && !@HAVE_FTELLO@)
+/* Get off_t.  */
+# include <sys/types.h>
+#endif
+
 #ifndef __attribute__
 /* This feature is available in gcc versions 2.5 and later.  */
 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
@@ -207,9 +212,15 @@ extern int vsprintf (char *str, const char *format, va_list args)
 # endif
 #endif
 
-#if @GNULIB_FSEEKO@
+#if @GNULIB_FFLUSH@ && @REPLACE_FFLUSH@
+/* Provide fseek, fseeko functions that are aware of a preceding fflush().  */
+# define fseeko rpl_fseeko
+extern int fseeko (FILE *fp, off_t offset, int whence);
+# define fseek(fp, offset, whence) fseeko (fp, (off_t)(offset), whence)
+#elif @GNULIB_FSEEKO@
 # if !@HAVE_FSEEKO@
 /* Assume 'off_t' is the same type as 'long'.  */
+typedef int verify_fseeko_types[2 * (sizeof (off_t) == sizeof (long)) - 1];
 #  define fseeko fseek
 # endif
 #else
@@ -220,9 +231,20 @@ extern int vsprintf (char *str, const char *format, va_list args)
     fseeko (f, o, w))
 #endif
 
+#if defined GNULIB_POSIXCHECK
+# ifndef fseek
+#  define fseek(f,o,w) \
+     (GL_LINK_WARNING ("fseek cannot handle files larger than 4 GB " \
+                       "on 32-bit platforms - " \
+                       "use fseeko function for handling of large files"), \
+      fseek (f, o, w))
+# endif
+#endif
+
 #if @GNULIB_FTELLO@
 # if !@HAVE_FTELLO@
 /* Assume 'off_t' is the same type as 'long'.  */
+typedef int verify_ftello_types[2 * (sizeof (off_t) == sizeof (long)) - 1];
 #  define ftello ftell
 # endif
 #else
@@ -233,6 +255,16 @@ extern int vsprintf (char *str, const char *format, va_list args)
     ftello (f))
 #endif
 
+#if defined GNULIB_POSIXCHECK
+# ifndef ftell
+#  define ftell(f) \
+     (GL_LINK_WARNING ("ftell cannot handle files larger than 4 GB " \
+                       "on 32-bit platforms - " \
+                       "use ftello function for handling of large files"), \
+      ftell (f))
+# endif
+#endif
+
 #if @GNULIB_FFLUSH@
 # if @REPLACE_FFLUSH@
 #  define fflush rpl_fflush