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Annotation of embedaddon/php/ext/bcmath/libbcmath/src/str2num.c, revision 1.1.1.1

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: