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From d73f1b630848fb7d90f51938e3c75a42ad947c26 Mon Sep 17 00:00:00 2001
From: Steven Barth <cyrus@openwrt.org>
Date: Mon, 15 Dec 2014 14:26:34 +0100
Subject: [PATCH 5/5] build: add --without-libgmp switch to disable use of
shared libgmp
This disables linking the >400 KB big libgmp and replace it with
the builtin mini-gmp which only increases size by ~30KB.
Signed-off-by: Steven Barth <cyrus@openwrt.org>
---
configure.ac | 17 +++++++++++++---
include/expression.h | 2 +-
include/gmputil.h | 10 +++++++++
include/utils.h | 4 ++--
src/Makefile.am | 4 ++++
src/gmputil.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++--
6 files changed, 86 insertions(+), 8 deletions(-)
--- a/configure.ac
+++ b/configure.ac
@@ -73,8 +73,18 @@ AM_CONDITIONAL([BUILD_PDF], [test "$DBLA
PKG_CHECK_MODULES([LIBMNL], [libmnl >= 1.0.3])
PKG_CHECK_MODULES([LIBNFTNL], [libnftnl >= 1.0.2])
-AC_CHECK_LIB([gmp], [__gmpz_init], ,
- AC_MSG_ERROR([No suitable version of libgmp found]))
+AC_ARG_WITH([libgmp], [AS_HELP_STRING([--without-libgmp],
+ [Disable libgmp support (use builtin mini-gmp)])], [],
+ [with_libgmp=yes])
+AS_IF([test "x$with_libgmp" != xno], [
+AC_CHECK_LIB([gmp],[__gmpz_init], , AC_MSG_ERROR([No suitable version of libgmp found]))
+])
+AM_CONDITIONAL([BUILD_MINIGMP], [test "x$with_libgmp" == xno])
+
+
+AS_IF([test "x$with_libgmp" != xyes -a "x$CONFIG_DEBUG" = xy], [
+AC_MSG_ERROR([--without-libgmp MUST be used with --disable-debug])
+])
AC_ARG_WITH([cli], [AS_HELP_STRING([--without-cli],
[disable interactive CLI (libreadline support)])],
@@ -130,4 +140,5 @@ AC_OUTPUT
echo "
nft configuration:
cli support: ${with_cli}
- enable debugging: ${with_debug}"
+ enable debugging: ${with_debug}
+ use shared libgmp: ${with_libgmp}"
--- a/include/expression.h
+++ b/include/expression.h
@@ -2,7 +2,7 @@
#define NFTABLES_EXPRESSION_H
#include <stdbool.h>
-#include <gmp.h>
+#include <gmputil.h>
#include <linux/netfilter/nf_tables.h>
#include <nftables.h>
--- a/include/gmputil.h
+++ b/include/gmputil.h
@@ -1,7 +1,17 @@
#ifndef NFTABLES_GMPUTIL_H
#define NFTABLES_GMPUTIL_H
+#include <config.h>
+
+#ifdef HAVE_LIBGMP
#include <gmp.h>
+#else
+#include <mini-gmp.h>
+/* mini-gmp doesn't come with gmp_printf, so we use our own minimal variant */
+extern int mpz_printf(const char *format, const mpz_t value);
+#define gmp_printf mpz_printf
+#endif
+
#include <asm/byteorder.h>
enum mpz_word_order {
--- a/include/utils.h
+++ b/include/utils.h
@@ -9,14 +9,14 @@
#include <unistd.h>
#include <assert.h>
#include <list.h>
-#include <gmp.h>
+#include <gmputil.h>
#define BITS_PER_BYTE 8
#ifdef DEBUG
#define pr_debug(fmt, arg...) gmp_printf(fmt, ##arg)
#else
-#define pr_debug(fmt, arg...) ({ if (false) gmp_printf(fmt, ##arg); 0; })
+#define pr_debug(fmt, arg...) ({ if (false) {}; 0; })
#endif
#define __fmtstring(x, y) __attribute__((format(printf, x, y)))
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -51,4 +51,8 @@ if BUILD_CLI
nft_SOURCES += cli.c
endif
+if BUILD_MINIGMP
+nft_SOURCES += mini-gmp.c
+endif
+
nft_LDADD = ${LIBMNL_LIBS} ${LIBNFTNL_LIBS}
--- a/src/gmputil.c
+++ b/src/gmputil.c
@@ -14,11 +14,9 @@
#include <stdio.h>
#include <unistd.h>
#include <string.h>
-#include <gmp.h>
#include <nftables.h>
#include <datatype.h>
-#include <gmputil.h>
#include <utils.h>
void mpz_bitmask(mpz_t rop, unsigned int width)
@@ -148,6 +146,61 @@ void mpz_switch_byteorder(mpz_t rop, uns
mpz_import_data(rop, data, BYTEORDER_HOST_ENDIAN, len);
}
+#ifndef HAVE_LIBGMP
+/* mini-gmp doesn't have a gmp_printf so we use our own minimal
+ * variant here which is able to format a single mpz_t */
+int mpz_printf(const char *f, const mpz_t value)
+{
+ int n = 0;
+ while (*f) {
+ if (*f != '%') {
+ if (fputc(*f, stdout) != *f)
+ return -1;
+
+ ++n;
+ } else {
+ unsigned long prec = 0;
+ int base;
+ size_t len;
+ char *str;
+ bool ok;
+
+ if (*++f == '.')
+ prec = strtoul(++f, (char**)&f, 10);
+
+ if (*f++ != 'Z')
+ return -1;
+
+ if (*f == 'u')
+ base = 10;
+ else if (*f == 'x')
+ base = 16;
+ else
+ return -1;
+
+ len = mpz_sizeinbase(value, base);
+ while (prec-- > len) {
+ if (fputc('0', stdout) != '0')
+ return -1;
+
+ ++n;
+ }
+
+ str = mpz_get_str(NULL, base, value);
+ ok = str && fwrite(str, 1, len, stdout) == len;
+ free(str);
+
+ if (!ok)
+ return -1;
+
+ n += len;
+ }
+ ++f;
+ }
+ return n;
+}
+#endif
+
static void *gmp_xrealloc(void *ptr, size_t old_size, size_t new_size)
{
return xrealloc(ptr, new_size);
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