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bcb89c75ec
There is no negative zero in the decimal system, so we must suppress the sign. Closes GH-7250.
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* num2str.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. (LICENSE)
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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 <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 a numbers to a string. Base 10 only.*/
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zend_string
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*bc_num2str_ex (num, scale)
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bc_num num;
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int scale;
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{
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zend_string *str;
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char *sptr;
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char *nptr;
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int index, signch;
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/* Allocate the string memory. */
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signch = num->n_sign != PLUS && !bc_is_zero_for_scale(num, MIN(num->n_scale, scale)); /* Number of sign chars. */
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if (scale > 0)
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str = zend_string_alloc(num->n_len + scale + signch + 1, 0);
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else
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str = zend_string_alloc(num->n_len + signch, 0);
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if (str == NULL) bc_out_of_memory();
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/* The negative sign if needed. */
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sptr = ZSTR_VAL(str);
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if (signch) *sptr++ = '-';
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/* Load the whole number. */
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nptr = num->n_value;
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for (index=num->n_len; index>0; index--)
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*sptr++ = BCD_CHAR(*nptr++);
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/* Now the fraction. */
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if (scale > 0)
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{
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*sptr++ = '.';
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for (index=0; index<scale && index<num->n_scale; index++)
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*sptr++ = BCD_CHAR(*nptr++);
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for (index = num->n_scale; index<scale; index++)
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*sptr++ = BCD_CHAR(0);
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}
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/* Terminate the string and return it! */
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*sptr = '\0';
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ZSTR_LEN(str) = sptr - (char *)ZSTR_VAL(str);
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return str;
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}
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