[Bug libfortran/60324] Handle arbitrarily long path names

["jb at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60324

--- Comment #8 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Thu Nov 13 12:05:01 2014
New Revision: 217480

URL: https://gcc.gnu.org/viewcvs?rev=217480&root=gcc&view=rev
Log:
PR 60324 Unbounded stack allocations in libgfortran.

2014-11-13  Janne Blomqvist  <jb@gcc.gnu.org>

    PR libfortran/60324
    * configure: Regenerated.
    * configure.ac (AM_CFLAGS): Add Werror=vla.
    * libgfortran.h (gfc_alloca): Remove macro.
    (fc_strdup_notrim): New prototype.
    * intrinsics/access.c (access_func): Use fc_strdup rather than
    stack allocation.
    * intrinsics/chdir.c (chdir_i4_sub): Likewise.
    (chdir_i8_sub): Likewise.
    * intrinsics/chmod.c (chmod_internal): New function, move logic
    here.
    (chmod_func): Call chmod_internal.
    * intrinsics/env.c (getenv): Use fc_strdup rather than stack
    allocation.
    (get_environment_variable_i4): Likewise.
    * intrinsics/execute_command_line.c (execute_command_line):
    Likewise.
    * intrinsics/hostnm.c (hostnm_0): New function, use static buffer
    rather than VLA.
    (hostnm_i4_sub): Call hostnm_0.
    (hostnm_i8_sub): Likewise.
    (hostnm): Likewise.
    * intrinsics/link.c (link_internal): New function, use fc_strdup
    rather than stack allocation.
    (link_i4_sub): Call link_internal.
    (link_i8_sub): Likewise.
    (link_i4): Likewise.
    (link_i8): Likewise.
    * intrinsics/perror.c (perror_sub): Use fc_strdup rather than
    stack allocation.
    * intrinsics/random.c (random_seed_i4): Use static buffer rather
    than VLA, use _Static_assert to make sure it's big enough.
    * intrinsics/rename.c (rename_internal): New function, use
    fc_strdup rather than stack allocation.
    (rename_i4_sub): Call rename_internal.
    (rename_i8_sub): Likewise.
    (rename_i4): Likewise.
    (rename_i8): Likewise.
    * intrinsics/stat.c (stat_i4_sub_0): Use fc_strdup rather than
    stack allocation.
    (stat_i8_sub_0): Likewise.
    * intrinsics/symlink.c (symlnk_internal): New function, use
    fc_strdup rather than stack allocation.
    (symlnk_i4_sub): Call symlnk_internal.
    (symlnk_i8_sub): Likewise.
    (symlnk_i4): Likewise.
    (symlnk_i8): Likewise.
    * intrinsics/system.c (system_sub): Use fc_strdup rather than
    stack allocation.
    * intrinsics/unlink.c (unlink_i4_sub): Likewise.
    * io/file_pos.c (READ_CHUNK): Make it a macro rather than variable.
    * io/list_read.c (nml_get_obj_data): Use fixed stack buffer, fall
    back to xmalloc/free for large sizes.
    * io/read.c (read_f): Likewise.
    * io/transfer.c (MAX_READ): Make it a macro rather than variable.
    (WRITE_CHUNK): Likewise.
    * io/write_float.def (write_float): Use fixed stack buffer, fall
    back to xmalloc/free for large sizes.
    * runtime/string.c (fc_strdup_notrim): New function.

Modified:
    trunk/libgfortran/ChangeLog
    trunk/libgfortran/configure
    trunk/libgfortran/configure.ac
    trunk/libgfortran/intrinsics/access.c
    trunk/libgfortran/intrinsics/chdir.c
    trunk/libgfortran/intrinsics/chmod.c
    trunk/libgfortran/intrinsics/env.c
    trunk/libgfortran/intrinsics/execute_command_line.c
    trunk/libgfortran/intrinsics/hostnm.c
    trunk/libgfortran/intrinsics/link.c
    trunk/libgfortran/intrinsics/perror.c
    trunk/libgfortran/intrinsics/random.c
    trunk/libgfortran/intrinsics/rename.c
    trunk/libgfortran/intrinsics/stat.c
    trunk/libgfortran/intrinsics/symlnk.c
    trunk/libgfortran/intrinsics/system.c
    trunk/libgfortran/intrinsics/unlink.c
    trunk/libgfortran/io/file_pos.c
    trunk/libgfortran/io/list_read.c
    trunk/libgfortran/io/read.c
    trunk/libgfortran/io/transfer.c
    trunk/libgfortran/io/write_float.def
    trunk/libgfortran/libgfortran.h
    trunk/libgfortran/runtime/string.c