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/*
* The MIT License
*
* Copyright (C) 2011-2016 Alexander Saprykin <saprykin.spb@gmail.com>
* Copyright (C) 2009 Tom Van Baak (tvb) www.LeapSecond.com
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* 'Software'), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "pmem.h"
#include "pstring.h"
#include <string.h>
#include <ctype.h>
#define P_STR_MAX_EXPON 308
P_LIB_API pchar *
p_strdup (const pchar *str)
{
pchar *ret;
psize len;
if (P_UNLIKELY (str == NULL))
return NULL;
len = strlen (str) + 1;
if (P_UNLIKELY ((ret = p_malloc (len)) == NULL))
return NULL;
memcpy (ret, str, len);
return ret;
}
P_LIB_API pchar *
p_strchomp (const pchar *str)
{
pssize pos_start, pos_end;
psize str_len;
pchar *ret;
const pchar *ptr;
if (P_UNLIKELY (str == NULL))
return NULL;
ptr = str;
pos_start = 0;
pos_end = ((pssize) strlen (str)) - 1;
while (pos_start < pos_end && isspace (* ((const puchar *) ptr++)))
++pos_start;
ptr = str + pos_end;
while (pos_end > 0 && isspace (* ((const puchar *) ptr--)))
--pos_end;
if (pos_end < pos_start)
return p_strdup ("\0");
if (pos_end == pos_start && isspace (* ((const puchar *) (str + pos_end))))
return p_strdup ("\0");
str_len = (psize) (pos_end - pos_start + 2);
if (P_UNLIKELY ((ret = p_malloc0 (str_len)) == NULL))
return NULL;
memcpy (ret, str + pos_start, str_len - 1);
*(ret + str_len - 1) = '\0';
return ret;
}
P_LIB_API pchar *
p_strtok (pchar *str, const pchar *delim, pchar **buf)
{
if (P_UNLIKELY (delim == NULL))
return str;
#ifdef P_OS_WIN
# ifdef P_CC_MSVC
if (P_UNLIKELY (buf == NULL))
return str;
# if _MSC_VER < 1400
P_UNUSED (buf);
return strtok (str, delim);
# else
return strtok_s (str, delim, buf);
# endif
# else
P_UNUSED (buf);
return strtok (str, delim);
# endif
#else
if (P_UNLIKELY (buf == NULL))
return str;
return strtok_r (str, delim, buf);
#endif
}
P_LIB_API double
p_strtod (const pchar *str)
{
double sign;
double value;
double scale;
double pow10;
puint expon;
pint frac;
pchar *orig_str, *strp;
orig_str = p_strchomp (str);
if (P_UNLIKELY (orig_str == NULL))
return 0.0;
strp = orig_str;
sign = 1.0;
if (*strp == '-') {
sign = -1.0;
strp += 1;
} else if (*strp == '+')
strp += 1;
/* Get digits before decimal point or exponent, if any */
for (value = 0.0; isdigit ((pint) *strp); strp += 1)
value = value * 10.0 + (*strp - '0');
/* Get digits after decimal point, if any */
if (*strp == '.') {
pow10 = 10.0;
strp += 1;
while (isdigit ((pint) *strp)) {
value += (*strp - '0') / pow10;
pow10 *= 10.0;
strp += 1;
}
}
/* Handle exponent, if any */
frac = 0;
scale = 1.0;
if ((*strp == 'e') || (*strp == 'E')) {
/* Get sign of exponent, if any */
strp += 1;
if (*strp == '-') {
frac = 1;
strp += 1;
} else if (*strp == '+')
strp += 1;
/* Get digits of exponent, if any */
for (expon = 0; isdigit ((pint) *strp); strp += 1)
expon = expon * 10 + (puint) ((*strp - '0'));
if (P_UNLIKELY (expon > P_STR_MAX_EXPON))
expon = P_STR_MAX_EXPON;
/* Calculate scaling factor */
while (expon >= 50) {
scale *= 1e50;
expon -= 50;
}
while (expon >= 8) {
scale *= 1e8;
expon -= 8;
}
while (expon > 0) {
scale *= 10.0;
expon -= 1;
}
}
p_free (orig_str);
/* Return signed and scaled floating point result */
return sign * (frac ? (value / scale) : (value * scale));
}
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