From 0801fe615c2657fec3205626c7ae60a28db680fe Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 13 Aug 2018 12:37:34 +0000
Subject: internals: -shared/-static heuristics: added slbt_get_lconf_flags().
---
include/slibtool/slibtool.h | 3 +
project/common.mk | 1 +
project/headers.mk | 1 +
src/internal/slibtool_lconf_impl.c | 185 +++++++++++++++++++++++++++++++++++++
src/internal/slibtool_lconf_impl.h | 13 +++
5 files changed, 203 insertions(+)
create mode 100644 src/internal/slibtool_lconf_impl.c
create mode 100644 src/internal/slibtool_lconf_impl.h
diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index e06ef79..fac022f 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -87,6 +87,9 @@ enum slbt_custom_error {
SLBT_ERR_LINK_FREQ,
SLBT_ERR_BAD_DATA,
SLBT_ERR_UNINSTALL_FAIL,
+ SLBT_ERR_LCONF_OPEN,
+ SLBT_ERR_LCONF_MAP,
+ SLBT_ERR_LCONF_PARSE,
};
/* execution modes */
diff --git a/project/common.mk b/project/common.mk
index 9267415..e08e900 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -21,6 +21,7 @@ API_SRCS = \
INTERNAL_SRCS = \
src/internal/$(PACKAGE)_dprintf_impl.c \
src/internal/$(PACKAGE)_errinfo_impl.c \
+ src/internal/$(PACKAGE)_lconf_impl.c \
src/internal/$(PACKAGE)_libmeta_impl.c \
src/internal/$(PACKAGE)_mapfile_impl.c \
src/internal/$(PACKAGE)_objmeta_impl.c \
diff --git a/project/headers.mk b/project/headers.mk
index 2581965..62b6f52 100644
--- a/project/headers.mk
+++ b/project/headers.mk
@@ -8,6 +8,7 @@ INTERNAL_HEADERS = \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_driver_impl.h \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_errinfo_impl.h \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_install_impl.h \
+ $(PROJECT_DIR)/src/internal/$(PACKAGE)_lconf_impl.h \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_mapfile_impl.h \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_metafile_impl.h \
$(PROJECT_DIR)/src/internal/$(PACKAGE)_mkdir_impl.h \
diff --git a/src/internal/slibtool_lconf_impl.c b/src/internal/slibtool_lconf_impl.c
new file mode 100644
index 0000000..9daba91
--- /dev/null
+++ b/src/internal/slibtool_lconf_impl.c
@@ -0,0 +1,185 @@
+/*******************************************************************/
+/* slibtool: a skinny libtool implementation, written in C */
+/* Copyright (C) 2016--2018 Z. Gilboa */
+/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "slibtool_lconf_impl.h"
+#include "slibtool_driver_impl.h"
+#include "slibtool_errinfo_impl.h"
+#include "slibtool_symlink_impl.h"
+#include "slibtool_readlink_impl.h"
+
+enum slbt_lconf_opt {
+ SLBT_LCONF_OPT_UNKNOWN,
+ SLBT_LCONF_OPT_NO,
+ SLBT_LCONF_OPT_YES,
+};
+
+static void slbt_lconf_close(int fdcwd, int fdlconfdir)
+{
+ if (fdlconfdir != fdcwd)
+ close(fdlconfdir);
+}
+
+static int slbt_lconf_open(
+ struct slbt_driver_ctx * dctx,
+ const char * lconf)
+{
+ int fdcwd;
+ int fdlconf;
+ int fdlconfdir;
+ int fdparent;
+ struct stat stcwd;
+ struct stat stparent;
+
+ fdcwd = slbt_driver_fdcwd(dctx);
+ fdlconfdir = fdcwd;
+
+ if (lconf)
+ return ((fdlconf = openat(fdcwd,lconf,O_RDONLY,0)) < 0)
+ ? SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_LCONF_OPEN)
+ : fdlconf;
+
+ if (fstatat(fdlconfdir,".",&stcwd,0) < 0)
+ return SLBT_SYSTEM_ERROR(dctx);
+
+ fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
+
+ while (fdlconf < 0) {
+ fdparent = openat(fdlconfdir,"../",O_DIRECTORY,0);
+ slbt_lconf_close(fdcwd,fdlconfdir);
+
+ if (fdparent < 0)
+ return SLBT_SYSTEM_ERROR(dctx);
+
+ if (fstat(fdparent,&stparent) < 0)
+ return SLBT_SYSTEM_ERROR(dctx);
+
+ if (stparent.st_dev != stcwd.st_dev)
+ return SLBT_CUSTOM_ERROR(
+ dctx,SLBT_ERR_LCONF_OPEN);
+
+ fdlconfdir = fdparent;
+ fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
+ }
+
+ return fdlconf;
+}
+
+int slbt_get_lconf_flags(
+ struct slbt_driver_ctx * dctx,
+ const char * lconf,
+ uint64_t * flags)
+{
+ int fdlconf;
+ struct stat st;
+ void * addr;
+ const char * mark;
+ const char * cap;
+ uint64_t optshared;
+ uint64_t optstatic;
+ int optlenmax;
+ int optsharedlen;
+ int optstaticlen;
+ const char * optsharedstr;
+ const char * optstaticstr;
+
+ /* open relative libtool script */
+ if ((fdlconf = slbt_lconf_open(dctx,lconf)) < 0)
+ return SLBT_NESTED_ERROR(dctx);
+
+ if (fdlconf < 0)
+ return SLBT_CUSTOM_ERROR(
+ dctx,SLBT_ERR_LCONF_OPEN);
+
+ /* map relative libtool script */
+ if (fstat(fdlconf,&st) < 0)
+ return SLBT_SYSTEM_ERROR(dctx);
+
+ addr = mmap(
+ 0,st.st_size,
+ PROT_READ,MAP_SHARED,
+ fdlconf,0);
+
+ close(fdlconf);
+
+ if (addr == MAP_FAILED)
+ return SLBT_CUSTOM_ERROR(
+ dctx,SLBT_ERR_LCONF_MAP);
+
+ mark = addr;
+ cap = &mark[st.st_size];
+
+ /* hard-coded options in the generated libtool precede the code */
+ if (st.st_size >= (optlenmax = strlen("build_libtool_libs=yes\n")))
+ cap -= optlenmax;
+
+ /* scan */
+ optshared = 0;
+ optstatic = 0;
+
+ optsharedstr = "build_libtool_libs=";
+ optstaticstr = "build_old_libs=";
+
+ optsharedlen = strlen(optsharedstr);
+ optstaticlen = strlen(optstaticstr);
+
+ for (; mark && mark<cap; ) {
+ if (!strncmp(mark,optsharedstr,optsharedlen)) {
+ mark += optsharedlen;
+
+ if ((mark[0]=='n')
+ && (mark[1]=='o')
+ && (mark[2]=='\n'))
+ optshared = SLBT_DRIVER_DISABLE_SHARED;
+
+ if ((mark[0]=='y')
+ && (mark[1]=='e')
+ && (mark[2]=='s')
+ && (mark[3]=='\n'))
+ optshared = SLBT_DRIVER_SHARED;
+
+ } if (!strncmp(mark,optstaticstr,optstaticlen)) {
+ mark += optstaticlen;
+
+ if ((mark[0]=='n')
+ && (mark[1]=='o')
+ && (mark[2]=='\n'))
+ optstatic = SLBT_DRIVER_DISABLE_STATIC;
+
+ if ((mark[0]=='y')
+ && (mark[1]=='e')
+ && (mark[2]=='s')
+ && (mark[3]=='\n'))
+ optstatic = SLBT_DRIVER_STATIC;
+ }
+
+ if (optshared && optstatic)
+ mark = 0;
+
+ else {
+ for (; (mark<cap) && (*mark!='\n'); )
+ mark++;
+ mark++;
+ }
+ }
+
+ munmap(addr,st.st_size);
+
+ if (!optshared || !optstatic)
+ return SLBT_CUSTOM_ERROR(
+ dctx,SLBT_ERR_LCONF_PARSE);
+
+ *flags = optshared | optstatic;
+
+ return 0;
+}
diff --git a/src/internal/slibtool_lconf_impl.h b/src/internal/slibtool_lconf_impl.h
new file mode 100644
index 0000000..d2bd44c
--- /dev/null
+++ b/src/internal/slibtool_lconf_impl.h
@@ -0,0 +1,13 @@
+#ifndef SLIBTOOL_LCONF_IMPL_H
+#define SLIBTOOL_LCONF_IMPL_H
+
+#include <stdint.h>
+
+struct slbt_driver_ctx;
+
+int slbt_get_lconf_flags(
+ struct slbt_driver_ctx * dctx,
+ const char * lconf,
+ uint64_t * flags);
+
+#endif
--
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