CoCalc -- g_

GitHub Repository: freebsd/freebsd-src
Path: blob/main/contrib/gdtoa/g__fmt.c
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/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998 by Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Please send bug reports to David M. Gay (dmg at acm dot org,
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 * with " at " changed at "@" and " dot " changed to ".").	*/
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#include "gdtoaimp.h"
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#ifdef USE_LOCALE
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#include "locale.h"
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#endif
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 char *
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#ifdef KR_headers
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g__fmt(b, s, se, decpt, sign, blen) char *b; char *s; char *se; int decpt; ULong sign; size_t blen;
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#else
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g__fmt(char *b, char *s, char *se, int decpt, ULong sign, size_t blen)
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#endif
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{
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	int i, j, k;
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	char *be, *s0;
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	size_t len;
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#ifdef USE_LOCALE
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#ifdef NO_LOCALE_CACHE
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	char *decimalpoint = localeconv()->decimal_point;
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	size_t dlen = strlen(decimalpoint);
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#else
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	char *decimalpoint;
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	static char *decimalpoint_cache;
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	static size_t dlen;
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	if (!(s0 = decimalpoint_cache)) {
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		s0 = localeconv()->decimal_point;
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		dlen = strlen(s0);
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		if ((decimalpoint_cache = (char*)MALLOC(strlen(s0) + 1))) {
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			strcpy(decimalpoint_cache, s0);
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			s0 = decimalpoint_cache;
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			}
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		}
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	decimalpoint = s0;
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#endif
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#else
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#define dlen 0
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#endif
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	s0 = s;
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	len = (se-s) + dlen + 6; /* 6 = sign + e+dd + trailing null */
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	if (blen < len)
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		goto ret0;
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	be = b + blen - 1;
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	if (sign)
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		*b++ = '-';
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	if (decpt <= -4 || decpt > se - s + 5) {
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		*b++ = *s++;
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		if (*s) {
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#ifdef USE_LOCALE
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			while((*b = *decimalpoint++))
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				++b;
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#else
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			*b++ = '.';
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#endif
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			while((*b = *s++) !=0)
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				b++;
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			}
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		*b++ = 'e';
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		/* sprintf(b, "%+.2d", decpt - 1); */
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		if (--decpt < 0) {
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			*b++ = '-';
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			decpt = -decpt;
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			}
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		else
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			*b++ = '+';
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		for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10){}
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		for(;;) {
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			i = decpt / k;
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			if (b >= be)
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				goto ret0;
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			*b++ = i + '0';
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			if (--j <= 0)
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				break;
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			decpt -= i*k;
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			decpt *= 10;
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			}
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		*b = 0;
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		}
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	else if (decpt <= 0) {
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#ifdef USE_LOCALE
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		while((*b = *decimalpoint++))
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			++b;
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#else
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		*b++ = '.';
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#endif
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		if (be < b - decpt + (se - s))
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			goto ret0;
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		for(; decpt < 0; decpt++)
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			*b++ = '0';
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		while((*b = *s++) != 0)
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			b++;
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		}
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	else {
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		while((*b = *s++) != 0) {
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			b++;
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			if (--decpt == 0 && *s) {
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#ifdef USE_LOCALE
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				while(*b = *decimalpoint++)
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					++b;
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#else
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				*b++ = '.';
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#endif
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				}
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			}
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		if (b + decpt > be) {
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 ret0:
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			b = 0;
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			goto ret;
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			}
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		for(; decpt > 0; decpt--)
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			*b++ = '0';
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		*b = 0;
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		}
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 ret:
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	freedtoa(s0);
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	return b;
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 	}
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