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Diffstat (limited to '3rdparty/plibsys/src/pstring.c')
| -rw-r--r-- | 3rdparty/plibsys/src/pstring.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/3rdparty/plibsys/src/pstring.c b/3rdparty/plibsys/src/pstring.c new file mode 100644 index 0000000..ed46ec5 --- /dev/null +++ b/3rdparty/plibsys/src/pstring.c @@ -0,0 +1,206 @@ +/* + * 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)); +} |