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* convert string to fp only if fp is not NULL 

* add doc of eina_convert_atofp()
 * minor doc cleanup

SVN revision: 42697
This commit is contained in:
Vincent Torri 2009-09-25 11:23:37 +00:00
parent 6a284f8178
commit b2bda6edb2
1 changed files with 53 additions and 9 deletions
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62
legacy/eina/src/lib/eina_convert.c
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@ -353,7 +353,7 @@ eina_convert_xtoa(unsigned int n, char *s)
}
/**
* @brief Convert a string to a double
* @brief Convert a string to a double.
*
* @param src The string to convert.
* @param length The length of the string.
@ -487,7 +487,7 @@ eina_convert_atod(const char *src, int length, long long *m, long *e)
}
/**
* @brief Convert a double to a string
* @brief Convert a double to a string.
*
* @param d The double to convert.
* @param des The destination buffer to store the converted double.
@ -571,7 +571,7 @@ eina_convert_dtoa(double d, char *des)
}
/**
* @brief Convert a 32.32 fixed point number to a string
* @brief Convert a 32.32 fixed point number to a string.
*
* @param fp The fixed point number to convert.
* @param des The destination buffer to store the converted fixed point number.
@ -685,22 +685,66 @@ eina_convert_fptoa(Eina_F32p32 fp, char *des)
return length + eina_convert_itoa(p, des);
}
/**
* @brief Convert a string to a 32.32 fixed point number.
*
* @param src The string to convert.
* @param length The length of the string.
* @param fp The fixed point number.
* @return #EINA_TRUE on success, #EINA_FALSE otherwise.
*
* This function converts the string @p src of length @p length that
* represent a double in hexadecimal base to a 32.32 fixed point
* number stored in @p fp. If @fp is @c NULL, nothing is done and
* #EINA_TRUE is returned.
*
* The string must have the following format:
*
* @code
* [-]0xh.hhhhhp[+-]e
* @endcode
*
* where the h are the hexadecimal cyphers of the mantiss and e the
* exponent (a decimal number). If n is the number of cypers after the
* point, the returned mantiss and exponents are:
*
* @code
* mantiss : [-]hhhhhh
* exponent : 2^([+-]e - 4 * n)
* @endcode
*
* The mantiss and exponent are stored in the buffers pointed
* respectively by @p m and @p e.
*
* If the string is invalid, the error is set to:
*
* @li #EINA_ERROR_CONVERT_0X_NOT_FOUND if no 0x is found,
* @li #EINA_ERROR_CONVERT_P_NOT_FOUND if no p is found,
* @li #EINA_ERROR_CONVERT_OUTRUN_STRING_LENGTH if @p length is not
* correct.
*
* In those cases, #EINA_FALSE is returned, otherwise #EINA_TRUE is
* returned.
*
* @note The code uses eina_convert_atod() and do the correct bit
* shift to compute the fixed point number.
*/
EAPI Eina_Bool
eina_convert_atofp(const char *src, int length, Eina_F32p32 *fp)
{
long long m;
long e;
if (!fp)
return EINA_TRUE;
if (!eina_convert_atod(src, length, &m, &e))
return EINA_FALSE;
if (fp)
{
e += 32;
e += 32;
if (e > 0) *fp = m << e;
else *fp = m >> e;
}
if (e > 0) *fp = m << e;
else *fp = m >> e;
return EINA_TRUE;
}