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Annotation of embedaddon/php/ext/bcmath/libbcmath/src/str2num.c, revision 1.1

1.1     ! misho       1: /* str2num.c: bcmath library file. */
        !             2: /*
        !             3:     Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
        !             4:     Copyright (C) 2000 Philip A. Nelson
        !             5: 
        !             6:     This library is free software; you can redistribute it and/or
        !             7:     modify it under the terms of the GNU Lesser General Public
        !             8:     License as published by the Free Software Foundation; either
        !             9:     version 2 of the License, or (at your option) any later version.
        !            10: 
        !            11:     This library is distributed in the hope that it will be useful,
        !            12:     but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            14:     Lesser General Public License for more details.  (COPYING.LIB)
        !            15: 
        !            16:     You should have received a copy of the GNU Lesser General Public
        !            17:     License along with this library; if not, write to:
        !            18: 
        !            19:       The Free Software Foundation, Inc.
        !            20:       59 Temple Place, Suite 330
        !            21:       Boston, MA 02111-1307 USA.
        !            22: 
        !            23:     You may contact the author by:
        !            24:        e-mail:  philnelson@acm.org
        !            25:       us-mail:  Philip A. Nelson
        !            26:                 Computer Science Department, 9062
        !            27:                 Western Washington University
        !            28:                 Bellingham, WA 98226-9062
        !            29:        
        !            30: *************************************************************************/
        !            31: 
        !            32: #include <config.h>
        !            33: #include <stdio.h>
        !            34: #include <assert.h>
        !            35: #include <stdlib.h>
        !            36: #include <ctype.h>
        !            37: #include <stdarg.h>
        !            38: #include "bcmath.h"
        !            39: #include "private.h"
        !            40: 
        !            41: /* Convert strings to bc numbers.  Base 10 only.*/
        !            42: 
        !            43: void
        !            44: bc_str2num (bc_num *num, char *str, int scale TSRMLS_DC)
        !            45: {
        !            46:   int digits, strscale;
        !            47:   char *ptr, *nptr;
        !            48:   char zero_int;
        !            49: 
        !            50:   /* Prepare num. */
        !            51:   bc_free_num (num);
        !            52: 
        !            53:   /* Check for valid number and count digits. */
        !            54:   ptr = str;
        !            55:   digits = 0;
        !            56:   strscale = 0;
        !            57:   zero_int = FALSE;
        !            58:   if ( (*ptr == '+') || (*ptr == '-'))  ptr++;  /* Sign */
        !            59:   while (*ptr == '0') ptr++;                   /* Skip leading zeros. */
        !            60:   while (isdigit((int)*ptr)) ptr++, digits++;  /* digits */
        !            61:   if (*ptr == '.') ptr++;                      /* decimal point */
        !            62:   while (isdigit((int)*ptr)) ptr++, strscale++;        /* digits */
        !            63:   if ((*ptr != '\0') || (digits+strscale == 0))
        !            64:     {
        !            65:       *num = bc_copy_num (BCG(_zero_));
        !            66:       return;
        !            67:     }
        !            68: 
        !            69:   /* Adjust numbers and allocate storage and initialize fields. */
        !            70:   strscale = MIN(strscale, scale);
        !            71:   if (digits == 0)
        !            72:     {
        !            73:       zero_int = TRUE;
        !            74:       digits = 1;
        !            75:     }
        !            76:   *num = bc_new_num (digits, strscale);
        !            77: 
        !            78:   /* Build the whole number. */
        !            79:   ptr = str;
        !            80:   if (*ptr == '-')
        !            81:     {
        !            82:       (*num)->n_sign = MINUS;
        !            83:       ptr++;
        !            84:     }
        !            85:   else
        !            86:     {
        !            87:       (*num)->n_sign = PLUS;
        !            88:       if (*ptr == '+') ptr++;
        !            89:     }
        !            90:   while (*ptr == '0') ptr++;                   /* Skip leading zeros. */
        !            91:   nptr = (*num)->n_value;
        !            92:   if (zero_int)
        !            93:     {
        !            94:       *nptr++ = 0;
        !            95:       digits = 0;
        !            96:     }
        !            97:   for (;digits > 0; digits--)
        !            98:     *nptr++ = CH_VAL(*ptr++);
        !            99: 
        !           100: 
        !           101:   /* Build the fractional part. */
        !           102:   if (strscale > 0)
        !           103:     {
        !           104:       ptr++;  /* skip the decimal point! */
        !           105:       for (;strscale > 0; strscale--)
        !           106:        *nptr++ = CH_VAL(*ptr++);
        !           107:     }
        !           108: }
        !           109: