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9aa6898b9b
Actually, there is no negative zero at all. We obey Postel's law, and still accept negative zeroes, but we store them as positive zeroes after the conversion from string, i.e. we normalize before further processing.
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/* str2num.c: bcmath library file. */
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/*
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Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
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Copyright (C) 2000 Philip A. Nelson
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details. (COPYING.LIB)
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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Boston, MA 02111-1307 USA.
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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#include <config.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include "bcmath.h"
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#include "private.h"
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/* Convert strings to bc numbers. Base 10 only.*/
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void
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bc_str2num (bc_num *num, char *str, int scale)
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{
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int digits, strscale;
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char *ptr, *nptr;
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char zero_int;
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/* Prepare num. */
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bc_free_num (num);
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/* Check for valid number and count digits. */
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ptr = str;
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digits = 0;
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strscale = 0;
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zero_int = FALSE;
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if ( (*ptr == '+') || (*ptr == '-')) ptr++; /* Sign */
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while (*ptr == '0') ptr++; /* Skip leading zeros. */
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while (isdigit((int)*ptr)) ptr++, digits++; /* digits */
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if (*ptr == '.') ptr++; /* decimal point */
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while (isdigit((int)*ptr)) ptr++, strscale++; /* digits */
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if ((*ptr != '\0') || (digits+strscale == 0))
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{
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*num = bc_copy_num (BCG(_zero_));
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return;
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}
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/* Adjust numbers and allocate storage and initialize fields. */
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strscale = MIN(strscale, scale);
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if (digits == 0)
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{
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zero_int = TRUE;
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digits = 1;
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}
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*num = bc_new_num (digits, strscale);
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/* Build the whole number. */
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ptr = str;
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if (*ptr == '-')
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{
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(*num)->n_sign = MINUS;
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ptr++;
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}
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else
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{
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(*num)->n_sign = PLUS;
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if (*ptr == '+') ptr++;
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}
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while (*ptr == '0') ptr++; /* Skip leading zeros. */
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nptr = (*num)->n_value;
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if (zero_int)
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{
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*nptr++ = 0;
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digits = 0;
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}
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for (;digits > 0; digits--)
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*nptr++ = CH_VAL(*ptr++);
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/* Build the fractional part. */
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if (strscale > 0)
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{
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ptr++; /* skip the decimal point! */
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for (;strscale > 0; strscale--)
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*nptr++ = CH_VAL(*ptr++);
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}
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if (bc_is_zero (*num))
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(*num)->n_sign = PLUS;
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}
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