0d3cb6726d
This cleans up vstr so that it's a pure "variable buffer", and the user can decide whether they need to add a terminating null byte. In most places where vstr is used, the vstr did not need to be null terminated and so this patch saves code size, a tiny bit of RAM, and makes vstr usage more efficient. When null termination is needed it must be done explicitly using vstr_null_terminate.
209 lines
7.9 KiB
C
209 lines
7.9 KiB
C
/*
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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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#ifndef __MICROPY_INCLUDED_PY_MISC_H__
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#define __MICROPY_INCLUDED_PY_MISC_H__
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// a mini library of useful types and functions
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/** types *******************************************************/
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#include <stdbool.h>
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#include <stddef.h>
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typedef unsigned char byte;
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typedef unsigned int uint;
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/** generic ops *************************************************/
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#ifndef MIN
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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#endif
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#ifndef MAX
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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#endif
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/** memomry allocation ******************************************/
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// TODO make a lazy m_renew that can increase by a smaller amount than requested (but by at least 1 more element)
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#define m_new(type, num) ((type*)(m_malloc(sizeof(type) * (num))))
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#define m_new_maybe(type, num) ((type*)(m_malloc_maybe(sizeof(type) * (num))))
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#define m_new0(type, num) ((type*)(m_malloc0(sizeof(type) * (num))))
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#define m_new_obj(type) (m_new(type, 1))
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#define m_new_obj_maybe(type) (m_new_maybe(type, 1))
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#define m_new_obj_var(obj_type, var_type, var_num) ((obj_type*)m_malloc(sizeof(obj_type) + sizeof(var_type) * (var_num)))
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#define m_new_obj_var_maybe(obj_type, var_type, var_num) ((obj_type*)m_malloc_maybe(sizeof(obj_type) + sizeof(var_type) * (var_num)))
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#if MICROPY_ENABLE_FINALISER
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#define m_new_obj_with_finaliser(type) ((type*)(m_malloc_with_finaliser(sizeof(type))))
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#else
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#define m_new_obj_with_finaliser(type) m_new_obj(type)
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#endif
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#define m_renew(type, ptr, old_num, new_num) ((type*)(m_realloc((ptr), sizeof(type) * (old_num), sizeof(type) * (new_num))))
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#define m_renew_maybe(type, ptr, old_num, new_num) ((type*)(m_realloc_maybe((ptr), sizeof(type) * (old_num), sizeof(type) * (new_num))))
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#define m_del(type, ptr, num) m_free(ptr, sizeof(type) * (num))
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#define m_del_obj(type, ptr) (m_del(type, ptr, 1))
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#define m_del_var(obj_type, var_type, var_num, ptr) (m_free(ptr, sizeof(obj_type) + sizeof(var_type) * (var_num)))
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void *m_malloc(size_t num_bytes);
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void *m_malloc_maybe(size_t num_bytes);
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void *m_malloc_with_finaliser(size_t num_bytes);
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void *m_malloc0(size_t num_bytes);
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void *m_realloc(void *ptr, size_t old_num_bytes, size_t new_num_bytes);
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void *m_realloc_maybe(void *ptr, size_t old_num_bytes, size_t new_num_bytes);
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void m_free(void *ptr, size_t num_bytes);
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void *m_malloc_fail(size_t num_bytes);
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#if MICROPY_MEM_STATS
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size_t m_get_total_bytes_allocated(void);
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size_t m_get_current_bytes_allocated(void);
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size_t m_get_peak_bytes_allocated(void);
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#endif
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/** array helpers ***********************************************/
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// get the number of elements in a fixed-size array
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#define MP_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
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// align ptr to the nearest multiple of "alignment"
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#define MP_ALIGN(ptr, alignment) (void*)(((mp_uint_t)(ptr) + ((alignment) - 1)) & ~((alignment) - 1))
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/** unichar / UTF-8 *********************************************/
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#if MICROPY_PY_BUILTINS_STR_UNICODE
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#include <stdint.h> // only include if we need it
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// with unicode enabled we need a type which can fit chars up to 0x10ffff
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typedef uint32_t unichar;
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#else
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// without unicode enabled we can only need to fit chars up to 0xff
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// (on 16-bit archs uint is 16-bits and more efficient than uint32_t)
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typedef uint unichar;
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#endif
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unichar utf8_get_char(const byte *s);
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const byte *utf8_next_char(const byte *s);
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bool unichar_isspace(unichar c);
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bool unichar_isalpha(unichar c);
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bool unichar_isprint(unichar c);
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bool unichar_isdigit(unichar c);
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bool unichar_isxdigit(unichar c);
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bool unichar_isupper(unichar c);
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bool unichar_islower(unichar c);
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unichar unichar_tolower(unichar c);
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unichar unichar_toupper(unichar c);
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mp_uint_t unichar_charlen(const char *str, mp_uint_t len);
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#define UTF8_IS_NONASCII(ch) ((ch) & 0x80)
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#define UTF8_IS_CONT(ch) (((ch) & 0xC0) == 0x80)
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/** variable string *********************************************/
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typedef struct _vstr_t {
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size_t alloc;
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size_t len;
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char *buf;
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bool had_error : 1;
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bool fixed_buf : 1;
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} vstr_t;
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// convenience macro to declare a vstr with a fixed size buffer on the stack
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#define VSTR_FIXED(vstr, alloc) vstr_t vstr; char vstr##_buf[(alloc)]; vstr_init_fixed_buf(&vstr, (alloc), vstr##_buf);
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void vstr_init(vstr_t *vstr, size_t alloc);
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void vstr_init_len(vstr_t *vstr, size_t len);
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void vstr_init_fixed_buf(vstr_t *vstr, size_t alloc, char *buf);
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void vstr_clear(vstr_t *vstr);
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vstr_t *vstr_new(void);
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vstr_t *vstr_new_size(size_t alloc);
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void vstr_free(vstr_t *vstr);
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void vstr_reset(vstr_t *vstr);
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bool vstr_had_error(vstr_t *vstr);
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char *vstr_str(vstr_t *vstr);
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size_t vstr_len(vstr_t *vstr);
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void vstr_hint_size(vstr_t *vstr, size_t size);
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char *vstr_extend(vstr_t *vstr, size_t size);
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char *vstr_add_len(vstr_t *vstr, size_t len);
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void vstr_null_terminate(vstr_t *vstr);
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void vstr_add_byte(vstr_t *vstr, byte v);
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void vstr_add_char(vstr_t *vstr, unichar chr);
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void vstr_add_str(vstr_t *vstr, const char *str);
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void vstr_add_strn(vstr_t *vstr, const char *str, size_t len);
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void vstr_ins_byte(vstr_t *vstr, size_t byte_pos, byte b);
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void vstr_ins_char(vstr_t *vstr, size_t char_pos, unichar chr);
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void vstr_cut_head_bytes(vstr_t *vstr, size_t bytes_to_cut);
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void vstr_cut_tail_bytes(vstr_t *vstr, size_t bytes_to_cut);
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void vstr_cut_out_bytes(vstr_t *vstr, size_t byte_pos, size_t bytes_to_cut);
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void vstr_printf(vstr_t *vstr, const char *fmt, ...);
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/** non-dynamic size-bounded variable buffer/string *************/
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#define CHECKBUF(buf, max_size) char buf[max_size + 1]; size_t buf##_len = max_size; char *buf##_p = buf;
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#define CHECKBUF_RESET(buf, max_size) buf##_len = max_size; buf##_p = buf;
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#define CHECKBUF_APPEND(buf, src, src_len) \
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{ size_t l = MIN(src_len, buf##_len); \
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memcpy(buf##_p, src, l); \
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buf##_len -= l; \
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buf##_p += l; }
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#define CHECKBUF_APPEND_0(buf) { *buf##_p = 0; }
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#define CHECKBUF_LEN(buf) (buf##_p - buf)
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#ifdef va_start
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void vstr_vprintf(vstr_t *vstr, const char *fmt, va_list ap);
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#endif
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// Debugging helpers
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int DEBUG_printf(const char *fmt, ...);
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extern mp_uint_t mp_verbose_flag;
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// This is useful for unicode handling. Some CPU archs has
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// special instructions for efficient implentation of this
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// function (e.g. CLZ on ARM).
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// NOTE: this function is unused at the moment
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#ifndef count_lead_ones
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static inline mp_uint_t count_lead_ones(byte val) {
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mp_uint_t c = 0;
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for (byte mask = 0x80; val & mask; mask >>= 1) {
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c++;
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}
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return c;
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}
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#endif
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/** float internals *************/
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#if MICROPY_PY_BUILTINS_FLOAT
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#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
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#define MP_FLOAT_EXP_BITS (11)
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#define MP_FLOAT_FRAC_BITS (52)
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#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
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#define MP_FLOAT_EXP_BITS (8)
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#define MP_FLOAT_FRAC_BITS (23)
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#endif
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#define MP_FLOAT_EXP_BIAS ((1 << (MP_FLOAT_EXP_BITS - 1)) - 1)
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#endif // MICROPY_PY_BUILTINS_FLOAT
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#endif // __MICROPY_INCLUDED_PY_MISC_H__
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