str2num.h

/*-
 * Copyright (c) 2005-2023 Rozhuk Ivan <rozhuk.im@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Author: Rozhuk Ivan <rozhuk.im@gmail.com>
 *
 */


#ifndef _STR2NUM_H_
#define _STR2NUM_H_

#include <sys/types.h>
#include <inttypes.h>


#define STR2NUM_SIGN(_str, _len, _sign)					\
	for (size_t _i = 0; _i < (_len); _i ++) {			\
		uint8_t _cval = ((const uint8_t*)(_str))[_i];		\
		if ('-' == _cval) {					\
			(_sign) = -1;					\
		} else if ('+' == _cval) {				\
			(_sign) = 1;					\
		} else {						\
			break;						\
		}							\
	}

#define STR2NUM(_str, _len, _res)					\
	for (size_t _i = 0; _i < (_len); _i ++) {			\
		uint8_t _cval = (((const uint8_t*)(_str))[_i] - '0');	\
		if (9 < _cval)						\
			continue;					\
		(_res) *= 10;						\
		(_res) += _cval;					\
	}

#define STR2UNUM(_str, _len, _type) do {				\
		_type _res = 0;						\
		if (NULL == (_str) || 0 == (_len))			\
			return (0);					\
		STR2NUM((_str), (_len), _res);				\
		return (_res);						\
} while (0)

#define STR2SNUM(_str, _len, _type) do {				\
		_type _res = 0, _sign = 1;				\
		if (NULL == (_str) || 0 == (_len))			\
			return (0);					\
		STR2NUM_SIGN((_str), (_len), _sign);			\
		STR2NUM((_str), (_len), _res);				\
		_res *= _sign;						\
		return (_res);						\
} while (0)


static inline size_t
str2usize(const char *str, const size_t str_len) {

	STR2UNUM(str, str_len, size_t);
}

static inline size_t
ustr2usize(const uint8_t *str, const size_t str_len) {

	STR2UNUM(str, str_len, size_t);
}

static inline uint8_t
str2u8(const char *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint8_t);
}

static inline uint8_t
ustr2u8(const uint8_t *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint8_t);
}

static inline uint16_t
str2u16(const char *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint16_t);
}

static inline uint16_t
ustr2u16(const uint8_t *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint16_t);
}

static inline uint32_t
str2u32(const char *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint32_t);
}

static inline uint32_t
ustr2u32(const uint8_t *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint32_t);
}

static inline uint64_t
str2u64(const char *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint64_t);
}

static inline uint64_t
ustr2u64(const uint8_t *str, const size_t str_len) {

	STR2UNUM(str, str_len, uint64_t);
}


/* Signed. */

static inline ssize_t
str2ssize(const char *str, const size_t str_len) {

	STR2SNUM(str, str_len, ssize_t);
}

static inline ssize_t
ustr2ssize(const uint8_t *str, const size_t str_len) {

	STR2SNUM(str, str_len, ssize_t);
}

static inline int8_t
str2s8(const char *str, const size_t str_len) {

	STR2SNUM(str, str_len, int8_t);
}

static inline int8_t
ustr2s8(const uint8_t *str, const size_t str_len) {

	STR2SNUM(str, str_len, int8_t);
}

static inline int16_t
str2s16(const char *str, const size_t str_len) {

	STR2SNUM(str, str_len, int16_t);
}

static inline int16_t
ustr2s16(const uint8_t *str, const size_t str_len) {

	STR2SNUM(str, str_len, int16_t);
}

static inline int32_t
str2s32(const char *str, const size_t str_len) {

	STR2SNUM(str, str_len, int32_t);
}

static inline int32_t
ustr2s32(const uint8_t *str, const size_t str_len) {

	STR2SNUM(str, str_len, int32_t);
}

static inline int64_t
str2s64(const char *str, const size_t str_len) {

	STR2SNUM(str, str_len, int64_t);
}

static inline int64_t
ustr2s64(const uint8_t *str, const size_t str_len) {

	STR2SNUM(str, str_len, int64_t);
}


#endif /* _STR2NUM_H_ */