2014-05-03 23:27:38 +01:00
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/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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2014-03-16 07:14:26 +00:00
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#include <stdbool.h>
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2013-10-20 14:39:58 +01:00
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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2014-02-06 21:11:19 +00:00
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#include <assert.h>
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2014-02-12 16:31:30 +00:00
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#include "mpconfig.h"
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2014-06-21 20:43:22 +01:00
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#include "misc.h"
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2013-10-20 14:39:58 +01:00
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// returned value is always at least 1 greater than argument
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#define ROUND_ALLOC(a) (((a) & ((~0) - 7)) + 8)
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2014-09-23 18:10:17 +01:00
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void vstr_init(vstr_t *vstr, size_t alloc) {
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2014-03-31 17:10:59 +01:00
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if (alloc < 2) {
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// need at least 1 byte for the null byte at the end
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alloc = 2;
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}
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2014-01-13 21:15:23 +00:00
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vstr->alloc = alloc;
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2013-10-20 14:39:58 +01:00
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vstr->len = 0;
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vstr->buf = m_new(char, vstr->alloc);
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if (vstr->buf == NULL) {
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vstr->had_error = true;
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return;
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}
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vstr->buf[0] = 0;
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vstr->had_error = false;
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2014-02-06 21:11:19 +00:00
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vstr->fixed_buf = false;
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}
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2014-09-23 18:10:17 +01:00
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void vstr_init_fixed_buf(vstr_t *vstr, size_t alloc, char *buf) {
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2014-02-06 21:11:19 +00:00
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assert(alloc > 0); // need at least room for the null byte
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vstr->alloc = alloc;
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vstr->len = 0;
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vstr->buf = buf;
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vstr->buf[0] = 0;
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vstr->had_error = false;
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vstr->fixed_buf = true;
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2013-10-20 14:39:58 +01:00
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}
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void vstr_clear(vstr_t *vstr) {
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2014-02-06 21:11:19 +00:00
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if (!vstr->fixed_buf) {
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m_del(char, vstr->buf, vstr->alloc);
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}
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2013-10-20 14:39:58 +01:00
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vstr->buf = NULL;
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}
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2013-10-23 20:20:17 +01:00
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vstr_t *vstr_new(void) {
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2013-10-20 14:39:58 +01:00
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vstr_t *vstr = m_new(vstr_t, 1);
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if (vstr == NULL) {
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return NULL;
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}
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2014-01-13 21:15:23 +00:00
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vstr_init(vstr, 32);
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return vstr;
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}
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2014-09-23 18:10:17 +01:00
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vstr_t *vstr_new_size(size_t alloc) {
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2014-01-13 21:15:23 +00:00
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vstr_t *vstr = m_new(vstr_t, 1);
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if (vstr == NULL) {
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return NULL;
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}
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vstr_init(vstr, alloc);
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2013-10-20 14:39:58 +01:00
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return vstr;
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}
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void vstr_free(vstr_t *vstr) {
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if (vstr != NULL) {
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2014-02-06 21:11:19 +00:00
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if (!vstr->fixed_buf) {
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m_del(char, vstr->buf, vstr->alloc);
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}
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2013-12-29 19:33:23 +00:00
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m_del_obj(vstr_t, vstr);
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2013-10-20 14:39:58 +01:00
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}
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}
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void vstr_reset(vstr_t *vstr) {
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vstr->len = 0;
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vstr->buf[0] = 0;
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vstr->had_error = false;
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}
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bool vstr_had_error(vstr_t *vstr) {
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return vstr->had_error;
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}
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char *vstr_str(vstr_t *vstr) {
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if (vstr->had_error) {
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return NULL;
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}
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return vstr->buf;
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}
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2014-09-23 18:10:17 +01:00
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size_t vstr_len(vstr_t *vstr) {
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2013-10-20 14:39:58 +01:00
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if (vstr->had_error) {
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return 0;
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}
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return vstr->len;
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}
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2014-09-23 18:10:17 +01:00
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// Extend vstr strictly by requested size, return pointer to newly added chunk
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char *vstr_extend(vstr_t *vstr, size_t size) {
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2014-02-06 21:11:19 +00:00
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if (vstr->fixed_buf) {
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return NULL;
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}
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2014-01-13 21:15:23 +00:00
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char *new_buf = m_renew(char, vstr->buf, vstr->alloc, vstr->alloc + size);
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if (new_buf == NULL) {
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vstr->had_error = true;
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return NULL;
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}
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char *p = new_buf + vstr->alloc;
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vstr->alloc += size;
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vstr->buf = new_buf;
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return p;
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}
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// Shrink vstr to be given size
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2014-09-23 18:10:17 +01:00
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bool vstr_set_size(vstr_t *vstr, size_t size) {
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2014-02-06 21:11:19 +00:00
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if (vstr->fixed_buf) {
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return false;
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}
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2014-01-13 21:15:23 +00:00
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char *new_buf = m_renew(char, vstr->buf, vstr->alloc, size);
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if (new_buf == NULL) {
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vstr->had_error = true;
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return false;
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}
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vstr->buf = new_buf;
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vstr->alloc = vstr->len = size;
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return true;
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}
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// Shrink vstr allocation to its actual length
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bool vstr_shrink(vstr_t *vstr) {
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return vstr_set_size(vstr, vstr->len);
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}
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2014-09-23 18:10:17 +01:00
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STATIC bool vstr_ensure_extra(vstr_t *vstr, size_t size) {
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2013-10-20 14:39:58 +01:00
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if (vstr->len + size + 1 > vstr->alloc) {
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2014-02-06 21:11:19 +00:00
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if (vstr->fixed_buf) {
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return false;
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}
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2014-09-23 18:10:17 +01:00
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size_t new_alloc = ROUND_ALLOC((vstr->len + size + 1) * 2);
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2013-12-29 19:33:23 +00:00
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char *new_buf = m_renew(char, vstr->buf, vstr->alloc, new_alloc);
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2013-10-20 14:39:58 +01:00
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if (new_buf == NULL) {
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vstr->had_error = true;
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return false;
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}
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vstr->alloc = new_alloc;
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vstr->buf = new_buf;
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}
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return true;
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}
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2014-09-23 18:10:17 +01:00
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void vstr_hint_size(vstr_t *vstr, size_t size) {
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2013-10-20 14:39:58 +01:00
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// it's not an error if we fail to allocate for the size hint
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bool er = vstr->had_error;
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vstr_ensure_extra(vstr, size);
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vstr->had_error = er;
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}
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2014-09-23 18:10:17 +01:00
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char *vstr_add_len(vstr_t *vstr, size_t len) {
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2013-10-20 14:39:58 +01:00
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if (vstr->had_error || !vstr_ensure_extra(vstr, len)) {
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return NULL;
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}
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char *buf = vstr->buf + vstr->len;
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vstr->len += len;
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vstr->buf[vstr->len] = 0;
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return buf;
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}
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2014-03-15 14:33:09 +00:00
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void vstr_add_byte(vstr_t *vstr, byte b) {
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2013-10-20 14:39:58 +01:00
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byte *buf = (byte*)vstr_add_len(vstr, 1);
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if (buf == NULL) {
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return;
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}
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2014-03-15 14:33:09 +00:00
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buf[0] = b;
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2013-10-20 14:39:58 +01:00
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}
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void vstr_add_char(vstr_t *vstr, unichar c) {
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2014-06-13 00:42:34 +01:00
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#if MICROPY_PY_BUILTINS_STR_UNICODE
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2014-06-03 20:28:12 +01:00
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// TODO: Can this be simplified and deduplicated?
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// Is it worth just calling vstr_add_len(vstr, 4)?
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if (c < 0x80) {
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byte *buf = (byte*)vstr_add_len(vstr, 1);
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if (buf == NULL) {
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return;
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}
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*buf = (byte)c;
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} else if (c < 0x800) {
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byte *buf = (byte*)vstr_add_len(vstr, 2);
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if (buf == NULL) {
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return;
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}
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buf[0] = (c >> 6) | 0xC0;
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buf[1] = (c & 0x3F) | 0x80;
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} else if (c < 0x10000) {
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byte *buf = (byte*)vstr_add_len(vstr, 3);
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if (buf == NULL) {
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return;
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}
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buf[0] = (c >> 12) | 0xE0;
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buf[1] = ((c >> 6) & 0x3F) | 0x80;
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buf[2] = (c & 0x3F) | 0x80;
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} else {
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assert(c < 0x110000);
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byte *buf = (byte*)vstr_add_len(vstr, 4);
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if (buf == NULL) {
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return;
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}
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buf[0] = (c >> 18) | 0xF0;
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buf[1] = ((c >> 12) & 0x3F) | 0x80;
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buf[2] = ((c >> 6) & 0x3F) | 0x80;
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buf[3] = (c & 0x3F) | 0x80;
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2013-10-20 14:39:58 +01:00
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}
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2014-06-13 00:42:34 +01:00
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#else
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byte *buf = (byte*)vstr_add_len(vstr, 1);
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if (buf == NULL) {
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return;
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}
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buf[0] = c;
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#endif
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2013-10-20 14:39:58 +01:00
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}
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void vstr_add_str(vstr_t *vstr, const char *str) {
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vstr_add_strn(vstr, str, strlen(str));
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}
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2014-09-23 18:10:17 +01:00
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void vstr_add_strn(vstr_t *vstr, const char *str, size_t len) {
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2013-10-20 14:39:58 +01:00
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if (vstr->had_error || !vstr_ensure_extra(vstr, len)) {
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2014-02-06 21:11:19 +00:00
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// if buf is fixed, we got here because there isn't enough room left
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// so just try to copy as much as we can, with room for null byte
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if (vstr->fixed_buf && vstr->len + 1 < vstr->alloc) {
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len = vstr->alloc - vstr->len - 1;
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goto copy;
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}
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2013-10-20 14:39:58 +01:00
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return;
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}
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2014-02-06 21:11:19 +00:00
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copy:
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2013-10-20 14:39:58 +01:00
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memmove(vstr->buf + vstr->len, str, len);
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vstr->len += len;
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vstr->buf[vstr->len] = 0;
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}
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2014-09-23 18:10:17 +01:00
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char *vstr_ins_blank_bytes(vstr_t *vstr, size_t byte_pos, size_t byte_len) {
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2014-03-15 14:33:09 +00:00
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if (vstr->had_error) {
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return NULL;
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}
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2014-09-23 18:10:17 +01:00
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size_t l = vstr->len;
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2014-03-15 14:33:09 +00:00
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if (byte_pos > l) {
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byte_pos = l;
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}
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if (byte_len > 0) {
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// ensure room for the new bytes
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if (!vstr_ensure_extra(vstr, byte_len)) {
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return NULL;
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}
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2014-03-15 16:54:06 +00:00
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// copy up the string to make room for the new bytes; +1 for the null byte
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memmove(vstr->buf + byte_pos + byte_len, vstr->buf + byte_pos, l - byte_pos + 1);
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2014-03-15 14:33:09 +00:00
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// increase the length
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vstr->len += byte_len;
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}
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return vstr->buf + byte_pos;
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}
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2014-09-23 18:10:17 +01:00
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void vstr_ins_byte(vstr_t *vstr, size_t byte_pos, byte b) {
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2014-03-15 14:33:09 +00:00
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char *s = vstr_ins_blank_bytes(vstr, byte_pos, 1);
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if (s != NULL) {
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*s = b;
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}
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}
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2014-09-23 18:10:17 +01:00
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void vstr_ins_char(vstr_t *vstr, size_t char_pos, unichar chr) {
|
2014-03-15 14:33:09 +00:00
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// TODO UNICODE
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2014-03-15 16:54:06 +00:00
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char *s = vstr_ins_blank_bytes(vstr, char_pos, 1);
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2014-03-15 14:33:09 +00:00
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if (s != NULL) {
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*s = chr;
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}
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}
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|
2014-09-23 18:10:17 +01:00
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void vstr_cut_head_bytes(vstr_t *vstr, size_t bytes_to_cut) {
|
2014-03-15 14:33:09 +00:00
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vstr_cut_out_bytes(vstr, 0, bytes_to_cut);
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}
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|
2014-09-23 18:10:17 +01:00
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void vstr_cut_tail_bytes(vstr_t *vstr, size_t len) {
|
2013-10-20 14:39:58 +01:00
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|
if (vstr->had_error) {
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return;
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}
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if (len > vstr->len) {
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vstr->len = 0;
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|
|
} else {
|
|
|
|
vstr->len -= len;
|
|
|
|
}
|
2014-01-22 23:18:50 +00:00
|
|
|
vstr->buf[vstr->len] = 0;
|
2013-10-20 14:39:58 +01:00
|
|
|
}
|
|
|
|
|
2014-09-23 18:10:17 +01:00
|
|
|
void vstr_cut_out_bytes(vstr_t *vstr, size_t byte_pos, size_t bytes_to_cut) {
|
2014-03-15 14:33:09 +00:00
|
|
|
if (vstr->had_error || byte_pos >= vstr->len) {
|
|
|
|
return;
|
|
|
|
} else if (byte_pos + bytes_to_cut >= vstr->len) {
|
|
|
|
vstr->len = byte_pos;
|
|
|
|
vstr->buf[vstr->len] = 0;
|
|
|
|
} else {
|
|
|
|
// move includes +1 for null byte at the end
|
|
|
|
memmove(vstr->buf + byte_pos, vstr->buf + byte_pos + bytes_to_cut, vstr->len - byte_pos - bytes_to_cut + 1);
|
|
|
|
vstr->len -= bytes_to_cut;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-10-20 14:39:58 +01:00
|
|
|
void vstr_printf(vstr_t *vstr, const char *fmt, ...) {
|
2013-11-03 18:20:56 +00:00
|
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
|
|
vstr_vprintf(vstr, fmt, ap);
|
|
|
|
va_end(ap);
|
|
|
|
}
|
|
|
|
|
|
|
|
void vstr_vprintf(vstr_t *vstr, const char *fmt, va_list ap) {
|
2013-10-20 14:39:58 +01:00
|
|
|
if (vstr->had_error || !vstr_ensure_extra(vstr, strlen(fmt))) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
// try to print in the allocated space
|
2014-01-03 14:03:48 +00:00
|
|
|
// need to make a copy of the va_list because we may call vsnprintf multiple times
|
2014-09-23 18:10:17 +01:00
|
|
|
size_t size = vstr->alloc - vstr->len;
|
2014-01-03 14:03:48 +00:00
|
|
|
va_list ap2;
|
|
|
|
va_copy(ap2, ap);
|
|
|
|
int n = vsnprintf(vstr->buf + vstr->len, size, fmt, ap2);
|
|
|
|
va_end(ap2);
|
2013-10-20 14:39:58 +01:00
|
|
|
|
|
|
|
// if that worked, return
|
|
|
|
if (n > -1 && n < size) {
|
|
|
|
vstr->len += n;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
// else try again with more space
|
|
|
|
if (n > -1) { // glibc 2.1
|
|
|
|
// n + 1 is precisely what is needed
|
|
|
|
if (!vstr_ensure_extra(vstr, n + 1)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else { // glibc 2.0
|
|
|
|
// increase to twice the old size
|
|
|
|
if (!vstr_ensure_extra(vstr, size * 2)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|