On 64-bit hosts (where size_t is 64 bits and int is 32 bits), the

On 64-bit hosts (where size_t is 64 bits and int is 32 bits), the
old glibc regex code mishandles strings longer than 2**31 bytes.
This patch fixes this when the regex code is used in gnulib
(i.e., outside glibc).

* lib/regex.h (_REGEX_LARGE_OFFSETS): New feature-test macro,
governing whether the rest of this patch is active.  By default,
the macro is disabled and the patch has no effect.
(regoff_t) [defined _REGEX_LARGE_OFFSETS]: Define to off_t, not int.
(__re_idx_t, __re_size_t, __re_long_size_t): New types.
(struct re_pattern_buffer, re_search, re_search_2, re_match):
(re_match_2, re_set_registers): Use the new types.
* lib/regex_internal.h (Idx, re_hashval_t): New types.
(REG_MISSING, REG_ERROR, REG_VALID_INDEX, REG_VALID_NONZERO_INDEX):
New macros.
(re_node_set, re_charset_t, re_token_t, re_string_realloc_buffers):
(re_string_context_at, bin_tree_t, re_dfastate_t):
(struct re_state_table_entry, state_array_t, re_sub_match_last_t):
(re_sub_match_top_t, re_match_context_t, re_sift_context_t):
(struct re_fail_stack_ent_t, struct re_fail_stack_t, struct re_dfa_t):
(re_string_char_size_at, re_string_wchar_at):
(re_string_elem_size_at):
Use the new types and macros to port to 64-bit hosts.
Use unsigned types for internal values, so that the code
mostly works even for arrays larger than SSIZE_MAX.
* lib/regcomp.c (re_compile_internal, init_dfa, duplicate_node):
(search_duplicated_node, calc_eclosure_iter, fetch_number):
(parse_reg_exp, parse_branch, parse_expression, parse_sub_exp):
(build_equiv_class, build_charclass, re_compile_fastmap_iter):
(free_dfa_content, create_initial_state, optimize_utf8, analyze):
(optimize_subexps, calc_first, link_nfa_nodes, duplicate_node_closure):
(calc_inveclosure, parse_dup_op, build_range_exp):
(build_collating_symbol, parse_bracket_exp, build_charclass_op):
(fetch_number, create_token_tree, mark_opt_subexp):
Likewise.
* lib/regex_internal.c
(re_string_construct_common, create_ci_newstate):
(create_cd_newstate, re_string_allocate, re_string_construct):
(re_string_realloc_buffers, build_wcs_upper_buffer):
(re_string_skip_chars, build_upper_buffer, re_string_translate_buffer):
(re_string_reconstruct, re_string_peek_byte_case):
(re_string_fetch_byte_case, re_string_context_at):
(re_node_set_alloc, re_node_set_init_1, re_node_set_init_2):
(re_node_set_init_copy, re_node_set_add_intersect):
(re_node_set_init_union, re_node_set_merge, re_node_set_insert):
(re_node_set_insert_last, re_node_set_compare, re_node_set_contains):
(re_node_set_remove_at, re_dfa_add_node, calc_state_hash):
(re_acquire_state, re_acquire_state_context, register_state):
Likewise.
* lib/regex.c
(match_ctx_init, match_ctx_add_entry, search_cur_bkref_entry):
(match_ctx_add_subtop, match_ctx_add_sublast, sift_ctx_init):
(re_search_internal, re_search_2_stub, re_search_stub)
(re_copy_regs, check_matching, check_halt_state_context, update_regs):
(push_fail_stack, sift_states_iter_mb, build_sifted_states):
(update_cur_sifted_state, check_dst_limits):
(check_dst_limits_calc_pos_1, check_dst_limits_calc_pos):
(check_subexp_limits, sift_states_bkref, merge_state_array):
(check_subexp_matching_top, get_subexp, get_subexp_sub):
(find_subexp_node, check_arrival, check_arrival_add_next_nodes):
(check_arrival_expand_ecl, check_arrival_expand_ecl_sub):
(expand_bkref_cache, check_node_accept_bytes):
(group_nodes_into_DFAstates, check_node_accept, regexec, re_match):
(re_search, re_match_2, re_search_2, prune_impossible_nodes):
(acquire_init_state_context, check_halt_node_context):
(proceed_next_node, pop_fail_stack, set_regs, free_fail_stack_return):
(sift_states_backward, clean_state_log_if_needed):
(sub_epsilon_src_nodes, add_epsilone_src_nodes, merge_state_with_log):
(find_recover_state, transit_state_sb, transit_state_mb):
(transit_state_bkref, build_trtable, match_ctx_clean):
Likewise.
* lib/regcomp.c (parse_dup_op): Add an extra test if Idx is unsigned,
to work around an assumption that REG_MISSING is negative.
* m4/regex.m4 (gl_REGEX): Require AC_SYS_LARGEFILE, Define
_REGEX_LARGE_OFFSETS).  Test for regoff_t/off_t bug in 64-bit
and large-file glibc and in 32-bit large-file Solaris.
* config/srclist.txt: Add glibc bug 1281.