#!/bin/sh
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Reads etc/ld.so.conf and/or etc/ld.so.conf.d/*.conf and returns the
# appropriate linker flags.
#
#  sysroot_ld_path.sh /abspath/to/sysroot
#

proc log_error_and_exit {
  echo $0: $ifsjoin(Argv)
  exit 1
}

proc process_entry {
  if test -z $1 || test -z $2 {
    log_error_and_exit "bad arguments to process_entry()"
  }
  local root="$1"
  local localpath="$2"

  echo $localpath | grep -qs '^/'
  if test $Status -ne 0 {
    log_error_and_exit $localpath does not start with /
  }
  local entry="$root$localpath"
  echo -L$entry
  echo -Wl,-rpath-link=$entry
}

proc process_ld_so_conf {
  if test -z $1 || test -z $2 {
    log_error_and_exit "bad arguments to process_ld_so_conf()"
  }
  local root="$1"
  local ld_so_conf="$2"

  # ld.so.conf may include relative include paths. pushd is a bashism.
  local saved_pwd=$[pwd]
  cd $[dirname $ld_so_conf]

  cat $ld_so_conf | \
    while read ENTRY {
      echo $ENTRY | grep -qs ^include
      if test $Status -eq 0 {
        local included_files=$[echo $ENTRY | sed 's/^include //]
        echo $included_files | grep -qs ^/
        if test $Status -eq 0 {
          if ls $root$included_files >/dev/null !2 > !1  {
            for inc_file in [$root$included_files] {
              process_ld_so_conf $root $inc_file
            }
          }
        } else {
          if ls $[pwd]/$included_files >/dev/null !2 > !1  {
            for inc_file in [$[pwd]/$included_files] {
              process_ld_so_conf $root $inc_file
            }
          }
        }
        continue
      }

      echo $ENTRY | grep -qs ^/
      if test $Status -eq 0 {
        process_entry $root $ENTRY
      }
    }

  # popd is a bashism
  cd $saved_pwd
}

# Main

if test $Argc -ne 1 {
  echo Usage $0 /abspath/to/sysroot
  exit 1
}

echo $1 | grep -qs ' '
if test $Status -eq 0 {
  log_error_and_exit $1 contains whitespace.
}

setglobal LD_SO_CONF = ""$1/etc/ld.so.conf""
setglobal LD_SO_CONF_D = ""$1/etc/ld.so.conf.d""

if test -e $LD_SO_CONF {
  process_ld_so_conf $1 $LD_SO_CONF | xargs echo
} elif test -e $LD_SO_CONF_D {
  find $LD_SO_CONF_D -maxdepth 1 -name '*.conf' -print -quit > /dev/null
  if test $Status -eq 0 {
    for entry in [$LD_SO_CONF_D/*.conf] {
      process_ld_so_conf $1 $entry
    } | xargs echo
  }
}