forked from enlightenment/efl
307 lines
7.3 KiB
C
307 lines
7.3 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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include "eina_convert.h"
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/*============================================================================*
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* Local *
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*============================================================================*/
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static const char look_up_table[] = {'0', '1', '2', '3', '4',
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'5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f'};
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static int _init_count = 0;
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#define HEXA_TO_INT(Hexa) (Hexa >= 'a') ? Hexa - 'a' + 10 : Hexa - '0'
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static inline void reverse(char s[], int length)
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{
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int c, i, j;
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for (i = 0, j = length - 1; i < j; i++, j--)
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{
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c = s[i];
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s[i] = s[j];
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s[j] = c;
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}
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}
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/*============================================================================*
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* Global *
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*============================================================================*/
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/*============================================================================*
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* API *
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*============================================================================*/
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EAPI Eina_Error EINA_ERROR_CONVERT_P_NOT_FOUND = 0;
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EAPI Eina_Error EINA_ERROR_CONVERT_0X_NOT_FOUND = 0;
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EAPI Eina_Error EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH = 0;
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/*
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* Come from the second edition of The C Programming Language ("K&R2") on page 64
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*/
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EAPI int
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eina_convert_itoa(int n, char *s)
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{
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int i = 0;
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int r = 0;
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if (n < 0)
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{
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n = -n;
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*s++ = '-';
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r = 1;
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}
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do {
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s[i++] = n % 10 + '0';
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} while ((n /= 10) > 0);
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s[i] = '\0';
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reverse(s, i);
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return i + r;
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}
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EAPI int
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eina_convert_xtoa(unsigned int n, char *s)
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{
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int i;
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i = 0;
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do {
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s[i++] = look_up_table[n & 0xF];
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} while ((n >>= 4) > 0);
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s[i] = '\0';
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reverse(s, i);
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return i;
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}
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/* On Windows (using MinGW or VC++), printf-like functions */
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/* rely on MSVCRT, which does not fully support the C99 */
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/* specifications. In particular, they do not support the */
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/* modifier character %a. */
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EAPI int
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eina_convert_init(void)
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{
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_init_count++;
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if (_init_count > 1) goto init_out;
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eina_error_init();
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EINA_ERROR_CONVERT_0X_NOT_FOUND = eina_error_register("Error during string convertion to float, First '0x' was not found.");
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EINA_ERROR_CONVERT_P_NOT_FOUND = eina_error_register("Error during string convertion to float, First 'p' was not found.");
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EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH = eina_error_register("Error outrun string limit during convertion string convertion to float.");
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init_out:
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return _init_count;
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}
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EAPI int
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eina_convert_shutdown(void)
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{
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_init_count--;
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if (_init_count > 0) goto shutdown_out;
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eina_error_shutdown();
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shutdown_out:
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return _init_count;
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}
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/* That function converts a string created by a valid %a */
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/* modifier to a double. */
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/* */
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/* The string must have the following format: */
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/* */
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/* [-]0xh.hhhhhp[+-]e */
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/* */
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/* where e is a decimal number. */
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/* If n is the number of cyphers after the point, the */
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/* returned mantisse and exponents are */
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/* */
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/* mantisse: [-]hhhhhh */
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/* exponent: 2^([+-]e - 4 * n) */
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EAPI Eina_Bool
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eina_convert_atod(const char *src, int length, long long *m, long *e)
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{
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const char *str = src;
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long long mantisse;
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long exponent;
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int nbr_decimals = 0;
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int sign = 1;
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if (length <= 0) goto on_length_error;
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/* Compute the mantisse. */
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if (*str == '-')
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{
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sign = -1;
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str++;
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length--;
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}
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if (length <= 2) goto on_length_error;
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if (strncmp(str, "0x", 2))
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{
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eina_error_set(EINA_ERROR_CONVERT_0X_NOT_FOUND);
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EINA_ERROR_PDBG("'0x' not found in '%s'\n", src);
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return EINA_FALSE;
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}
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str += 2;
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length -= 2;
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mantisse = HEXA_TO_INT(*str);
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str++;
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length--; if (length <= 0) goto on_length_error;
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if (*str == '.')
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{
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for (str++, length--;
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length > 0 && *str != 'p';
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++str, --length, ++nbr_decimals)
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{
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mantisse <<= 4;
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mantisse += HEXA_TO_INT(*str);
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}
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}
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if (sign < 0) mantisse = -mantisse;
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/* Compute the exponent. */
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if (*str != 'p')
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{
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eina_error_set(EINA_ERROR_CONVERT_P_NOT_FOUND);
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EINA_ERROR_PDBG("'p' not found in '%s'\n", src);
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return EINA_FALSE;
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}
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sign = +1;
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str++;
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length--; if (length <= 0) goto on_length_error;
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if (strchr("-+", *str))
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{
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sign = (*str == '-') ? -1 : +1;
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str++; length--;
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}
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for (exponent = 0; length > 0 && *str != '\0'; ++str, --length)
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{
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exponent *= 10;
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exponent += *str - '0';
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}
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if (length <= 0) goto on_length_error;
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if (sign < 0)
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exponent = -exponent;
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*m = mantisse;
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*e = exponent - (nbr_decimals << 2);
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return EINA_TRUE;
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on_length_error:
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eina_error_set(EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH);
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return EINA_FALSE;
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}
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/* That function converts a double to a string that as the */
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/* following format: */
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/* */
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/* [-]0xh.hhhhhp[+-]e */
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/* */
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/* where h is a hexadecimal number and e a decimal number. */
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EAPI int
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eina_convert_dtoa(double d, char *des)
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{
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int length = 0;
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int p;
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int i;
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if (d < 0.0)
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{
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*(des++) = '-';
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d = -d;
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length++;
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}
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d = frexp(d, &p);
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if (p)
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{
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d *= 2;
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p -= 1;
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}
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*(des++) = '0';
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*(des++) = 'x';
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*(des++) = look_up_table[(size_t)d];
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*(des++) = '.';
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length += 4;
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for (i = 0; i < 16; i++, length++)
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{
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d -= floor(d);
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d *= 16;
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*(des++) = look_up_table[(size_t)d];
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}
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while (*(des - 1) == '0')
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{
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des--;
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length--;
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}
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if (*(des - 1) == '.')
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{
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des--;
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length--;
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}
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*(des++) = 'p';
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if (p < 0)
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{
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*(des++) = '-';
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p = -p;
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}
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else
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*(des++) = '+';
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length += 2;
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return length + eina_convert_itoa(p, des);
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}
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