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:
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