375 lines
11 KiB
C
375 lines
11 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2008 Cedric BAIL, Vincent Torri
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser 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 library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EINA_CONVERT_H_
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#define EINA_CONVERT_H_
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#include "eina_types.h"
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#include "eina_error.h"
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#include "eina_fp.h"
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/**
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* @addtogroup Eina_Convert_Group Convert
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*
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* These functions allow you to convert integer or real numbers to
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* string or conversely.
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*
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* To use these functions, you have to call eina_init()
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* first, and eina_shutdown() when eina is not used anymore.
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*
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* @section Eina_Convert_From_Integer_To_Sring Conversion from integer to string
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*
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* To convert an integer to a string in the decimal base,
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* eina_convert_itoa() should be used. If the hexadecimal base is
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* wanted, eina_convert_xtoa() should be used. They all need a buffer
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* sufficiently large to store all the cyphers.
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*
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* Here is an example of use:
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*
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* @code
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* #include <stdlib.h>
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* #include <stdio.h>
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*
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* #include <Eina.h>
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*
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* int main(void)
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* {
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* char tmp[128];
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*
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* if (!eina_init())
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* {
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* printf ("Error during the initialization of eina.\n");
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* return EXIT_FAILURE;
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* }
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*
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* eina_convert_itoa(45, tmp);
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* printf("value: %s\n", tmp);
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* eina_convert_xtoa(0xA1, tmp);
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* printf("value: %s\n", tmp);
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*
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* eina_shutdown();
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*
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* return EXIT_SUCCESS;
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* }
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* @endcode
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*
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* Compile this code with the following command:
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*
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* @code
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* gcc -Wall -o test_eina_convert test_eina.c `pkg-config --cflags --libs eina`
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* @endcode
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*
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* @note
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* The alphabetical cyphers are in lower case.
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*
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* @section Eina_Convert_Double Conversion double / string
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*
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* To convert a double to a string, eina_convert_dtoa() should be
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* used. Like with the integer functions, a buffer must be used. The
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* resulting string has the following format (which is the result
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* obtained with snprintf() and the @%a modifier):
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*
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* @code
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* [-]0xh.hhhhhp[+-]e
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* @endcode
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*
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* To convert a string to a double, eina_convert_atod() should be
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* used. The format of the string must be as above. Then, the double
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* has the following mantiss and exponent:
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*
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* @code
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* mantiss : [-]hhhhhh
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* exponent : 2^([+-]e - 4 * n)
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* @endcode
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*
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* with n being number of cypers after the point in the string
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* format. To obtain the double number from the mantiss and exponent,
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* use ldexp().
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*
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* Here is an example of use:
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*
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* @code
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* #include <stdlib.h>
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* #include <stdio.h>
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* #include <math.h>
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*
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* #include <Eina.h>
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*
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* int main(void)
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* {
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* char tmp[128];
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* long long int m = 0;
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* long int e = 0;
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* double r;
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*
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* if (!eina_init())
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* {
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* printf ("Error during the initialization of eina.\n");
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* return EXIT_FAILURE;
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* }
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*
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* printf("initial value : 40.56\n");
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* eina_convert_dtoa(40.56, tmp);
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* printf("result dtoa : %s\n", tmp);
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* eina_convert_atod(tmp, 128, &m, &e);
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* r = ldexp((double)m, e);
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* printf("result atod : %f\n", r);
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*
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* eina_shutdown();
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*
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* return EXIT_SUCCESS;
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* }
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* @endcode
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*
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* Compile this code with the following command:
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*
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* @code
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* gcc -Wall -o test_eina_convert test_eina.c `pkg-config --cflags --libs eina` -lm
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* @endcode
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*/
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/**
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* @addtogroup Eina_Tools_Group Tools
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*
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* @{
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*/
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/**
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* @defgroup Eina_Convert_Group Convert
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*
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* @{
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*/
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/**
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* @var EINA_ERROR_CONVERT_P_NOT_FOUND
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* Error identifier corresponding to string not containing 'p'.
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*/
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EAPI extern Eina_Error EINA_ERROR_CONVERT_P_NOT_FOUND;
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/**
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* @var EINA_ERROR_CONVERT_0X_NOT_FOUND
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* Error identifier corresponding to string not containing '0x'.
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*/
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EAPI extern Eina_Error EINA_ERROR_CONVERT_0X_NOT_FOUND;
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/**
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* @var EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH
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* Error identifier corresponding to length of the string being too small.
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*/
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EAPI extern Eina_Error EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH;
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/**
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* @brief Convert an integer number to a string in decimal base.
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*
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* @param n The integer to convert.
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* @param s The buffer to store the converted integer.
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* @return The length of the string, including the nul terminated
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* character.
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*
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* This function converts @p n to a nul terminated string. The
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* converted string is in decimal base. As no check is done, @p s must
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* be a buffer that is sufficiently large to store the integer.
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*
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* The returned value is the length of the string, including the nul
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* terminated character.
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*/
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EAPI int eina_convert_itoa(int n, char *s) EINA_ARG_NONNULL(2);
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/**
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* @brief Convert an integer number to a string in hexadecimal base.
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*
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* @param n The integer to convert.
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* @param s The buffer to store the converted integer.
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* @return The length of the string, including the nul terminated
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* character.
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*
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* This function converts @p n to a nul terminated string. The
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* converted string is in hexadecimal base and the alphabetical
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* cyphers are in lower case. As no check is done, @p s must be a
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* buffer that is sufficiently large to store the integer.
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*
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* The returned value is the length of the string, including the nul
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* terminated character.
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*/
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EAPI int eina_convert_xtoa(unsigned int n, char *s) EINA_ARG_NONNULL(2);
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/**
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* @brief Convert a double to a string.
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*
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* @param d The double to convert.
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* @param des The destination buffer to store the converted double.
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* @return #EINA_TRUE on success, #EINA_FALSE otherwise.
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*
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* This function converts the double @p d to a string. The string is
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* stored in the buffer pointed by @p des and must be sufficiently
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* large to contain the converted double. The returned string is nul
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* terminated and has the following format:
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*
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* @code
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* [-]0xh.hhhhhp[+-]e
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* @endcode
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*
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* where the h are the hexadecimal cyphers of the mantiss and e the
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* exponent (a decimal number).
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*
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* The returned value is the length of the string, including the nul
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* character.
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*/
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EAPI int eina_convert_dtoa(double d, char *des) EINA_ARG_NONNULL(2);
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/**
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* @brief Convert a string to a double.
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*
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* @param src The string to convert.
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* @param length The length of the string.
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* @param m The mantisse.
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* @param e The exponent.
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* @return #EINA_TRUE on success, #EINA_FALSE otherwise.
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*
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* This function converts the string @p s of length @p length that
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* represent a double in hexadecimal base to a double. It is used to
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* replace the use of snprintf() with the \%a modifier, which is
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* missing on some platform (like Windows (tm) or OpenBSD).
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*
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* The string must have the following format:
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*
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* @code
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* [-]0xh.hhhhhp[+-]e
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* @endcode
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*
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* where the h are the hexadecimal cyphers of the mantiss and e the
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* exponent (a decimal number). If n is the number of cypers after the
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* point, the returned mantiss and exponents are:
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*
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* @code
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* mantiss : [-]hhhhhh
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* exponent : 2^([+-]e - 4 * n)
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* @endcode
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*
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* The mantiss and exponent are stored in the buffers pointed
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* respectively by @p m and @p e.
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*
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* If the string is invalid, the error is set to:
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*
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* @li #EINA_ERROR_CONVERT_0X_NOT_FOUND if no 0x is found,
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* @li #EINA_ERROR_CONVERT_P_NOT_FOUND if no p is found,
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* @li #EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH if @p length is not
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* correct.
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*
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* In those cases, #EINA_FALSE is returned, otherwise #EINA_TRUE is
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* returned.
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*/
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EAPI Eina_Bool eina_convert_atod(const char *src,
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int length,
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long long *m,
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long *e) EINA_ARG_NONNULL(1, 3, 4);
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/**
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* @brief Convert a 32.32 fixed point number to a string.
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*
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* @param fp The fixed point number to convert.
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* @param des The destination buffer to store the converted fixed point number.
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* @return #EINA_TRUE on success, #EINA_FALSE otherwise.
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*
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* This function converts the 32.32 fixed point number @p fp to a
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* string. The string is stored in the buffer pointed by @p des and
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* must be sufficiently large to contain the converted fixed point
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* number. The returned string is terminated and has the following
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* format:
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*
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* @code
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* [-]0xh.hhhhhp[+-]e
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* @endcode
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*
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* where the h are the hexadecimal cyphers of the mantiss and e the
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* exponent (a decimal number).
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*
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* The returned value is the length of the string, including the nul
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* character.
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*
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* @note The code is the same than eina_convert_dtoa() except that it
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* implements the frexp() function for fixed point numbers and does
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* some optimisations.
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*/
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EAPI int eina_convert_fptoa(Eina_F32p32 fp,
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char *des) EINA_ARG_NONNULL(2);
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/**
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* @brief Convert a string to a 32.32 fixed point number.
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*
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* @param src The string to convert.
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* @param length The length of the string.
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* @param fp The fixed point number.
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* @return #EINA_TRUE on success, #EINA_FALSE otherwise.
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*
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* This function converts the string @p src of length @p length that
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* represent a double in hexadecimal base to a 32.32 fixed point
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* number stored in @p fp. The function always tries to convert the
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* string with eina_convert_atod().
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*
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* The string must have the following format:
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*
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* @code
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* [-]0xh.hhhhhp[+-]e
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* @endcode
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*
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* where the h are the hexadecimal cyphers of the mantiss and e the
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* exponent (a decimal number). If n is the number of cypers after the
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* point, the returned mantiss and exponents are:
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*
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* @code
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* mantiss : [-]hhhhhh
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* exponent : 2^([+-]e - 4 * n)
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* @endcode
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*
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* The mantiss and exponent are stored in the buffers pointed
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* respectively by @p m and @p e.
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*
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* If the string is invalid, the error is set to:
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*
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* @li #EINA_ERROR_CONVERT_0X_NOT_FOUND if no 0x is found,
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* @li #EINA_ERROR_CONVERT_P_NOT_FOUND if no p is found,
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* @li #EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH if @p length is not
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* correct.
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*
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* In those cases, or if @p fp is @c NULL, #EINA_FALSE is returned,
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* otherwise @p fp is computed and #EINA_TRUE is returned.
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*
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* @note The code uses eina_convert_atod() and do the correct bit
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* shift to compute the fixed point number.
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*/
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EAPI Eina_Bool eina_convert_atofp(const char *src,
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int length,
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Eina_F32p32 *fp) EINA_ARG_NONNULL(1, 3);
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* EINA_CONVERT_H_ */
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