Fixed bug 3292 - SDL_rwops and 64-bit file I/O

Juha Niemim?

On AmigaOS 4 platform with Newlib 'C' library, there is a problem with failing fseeko64. This seemed to be caused by using fopen instead of fopen64.

configure

@@ -16631,7 +16631,7 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 
-    for ac_func in malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname getauxval
+    for ac_func in malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fopen64 fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname getauxval
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

configure.in

@@ -268,7 +268,7 @@ if test x$enable_libc = xyes; then
         AC_DEFINE(HAVE_MPROTECT, 1, [ ])
         ]),
     )
-    AC_CHECK_FUNCS(malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname getauxval)
+    AC_CHECK_FUNCS(malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fopen64 fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname getauxval)
 
     AC_CHECK_LIB(m, pow, [LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"])
     AC_CHECK_FUNCS(atan atan2 acos asin ceil copysign cos cosf fabs floor log pow scalbn sin sinf sqrt sqrtf tan tanf)

include/SDL_config.h.cmake

@@ -159,6 +159,7 @@
 #cmakedefine HAVE_SQRTF 1
 #cmakedefine HAVE_TAN 1
 #cmakedefine HAVE_TANF 1
+#cmakedefine HAVE_FOPEN64 1
 #cmakedefine HAVE_FSEEKO 1
 #cmakedefine HAVE_FSEEKO64 1
 #cmakedefine HAVE_SIGACTION 1

include/SDL_config.h.in

@@ -161,6 +161,7 @@
 #undef HAVE_SQRTF
 #undef HAVE_TAN
 #undef HAVE_TANF
+#undef HAVE_FOPEN64
 #undef HAVE_FSEEKO
 #undef HAVE_FSEEKO64
 #undef HAVE_SIGACTION

src/file/SDL_rwops.c

@@ -292,6 +292,23 @@ windows_file_close(SDL_RWops * context)
 
 #ifdef HAVE_STDIO_H
 
+#ifdef HAVE_FOPEN64
+#define fopen   fopen64
+#endif
+#ifdef HAVE_FSEEKO64
+#define fseek_off_t off64_t
+#define fseek   fseeko64
+#define ftell   ftello64
+#elif defined(HAVE_FSEEKO)
+#define fseek_off_t off_t
+#define fseek   fseeko
+#define ftell   ftello
+#elif defined(HAVE__FSEEKI64)
+#define fseek_off_t __int64
+#define fseek   _fseeki64
+#define ftell   _ftelli64
+#endif
+
 /* Functions to read/write stdio file pointers */
 
 static Sint64 SDLCALL
@@ -312,23 +329,9 @@ stdio_size(SDL_RWops * context)
 static Sint64 SDLCALL
 stdio_seek(SDL_RWops * context, Sint64 offset, int whence)
 {
-#ifdef HAVE_FSEEKO64
-    if (fseeko64(context->hidden.stdio.fp, (off64_t)offset, whence) == 0) {
-        return ftello64(context->hidden.stdio.fp);
-    }
-#elif defined(HAVE_FSEEKO)
-    if (fseeko(context->hidden.stdio.fp, (off_t)offset, whence) == 0) {
-        return ftello(context->hidden.stdio.fp);
-    }
-#elif defined(HAVE__FSEEKI64)
-    if (_fseeki64(context->hidden.stdio.fp, offset, whence) == 0) {
-        return _ftelli64(context->hidden.stdio.fp);
-    }
-#else
-    if (fseek(context->hidden.stdio.fp, offset, whence) == 0) {
+    if (fseek(context->hidden.stdio.fp, (fseek_off_t)offset, whence) == 0) {
         return ftell(context->hidden.stdio.fp);
     }
-#endif
     return SDL_Error(SDL_EFSEEK);
 }