53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
#ifndef UNS_FORMAT_C89_H
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#define UNS_FORMAT_C89_H
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/* Copyright (C) 2024 Peter McGoron
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "uns.h"
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/* This is a strictly C89+ header format with relocation pointers and
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* lengths.
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*
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* Forwarding pointers need to be stored in the header because in strict
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* C, arithmetic on pointers is undefined for pointers not pointing into
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* the same object.
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*
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* The length of the string is limited to "len" bytes and is stored as
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* a `uns_sword`. If the word is negative, then the region is a record,
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* and if the number is positive then the region is just bytes.
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*/
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struct uns_c89_relo_hdr {
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void *relo;
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uns_sword len;
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};
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#define uns_c89_relo_get_hdr(p)((struct uns_c89_relo_hdr *)(p) - 1)
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size_t uns_c89_relo_get_len(void *p);
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size_t uns_c89_relo_get_record_len(void *p);
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#define uns_c89_relo_get_relo(p) (uns_c89_relo_get_hdr(p)->relo)
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#define uns_c89_relo_set_relo(p, v) (uns_c89_relo_get_relo(p) = (v))
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#define uns_c89_relo_is_record(p) (uns_c89_relo_get_hdr(p)->len < 0)
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void *uns_c89_relo_init(void *p, size_t len_size, int is_record);
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void uns_c89_relo_record_set(void *rec, size_t i, void *v);
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void *uns_c89_relo_record_get(void *rec, size_t i);
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#endif
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