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