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      1 /****************************************************************
      2 
      3 The author of this software is David M. Gay.
      4 
      5 Copyright (C) 1998 by Lucent Technologies
      6 All Rights Reserved
      7 
      8 Permission to use, copy, modify, and distribute this software and
      9 its documentation for any purpose and without fee is hereby
     10 granted, provided that the above copyright notice appear in all
     11 copies and that both that the copyright notice and this
     12 permission notice and warranty disclaimer appear in supporting
     13 documentation, and that the name of Lucent or any of its entities
     14 not be used in advertising or publicity pertaining to
     15 distribution of the software without specific, written prior
     16 permission.
     17 
     18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
     20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
     21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
     23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
     24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
     25 THIS SOFTWARE.
     26 
     27 ****************************************************************/
     28 
     29 /* Please send bug reports to David M. Gay (dmg at acm dot org,
     30  * with " at " changed at "@" and " dot " changed to ".").	*/
     31 
     32 #include "gdtoaimp.h"
     33 
     34 #ifdef USE_LOCALE
     35 #include "locale.h"
     36 #endif
     37 
     38  char *
     39 #ifdef KR_headers
     40 g__fmt(b, s, se, decpt, sign, blen) char *b; char *s; char *se; int decpt; ULong sign; size_t blen;
     41 #else
     42 g__fmt(char *b, char *s, char *se, int decpt, ULong sign, size_t blen)
     43 #endif
     44 {
     45 	int i, j, k;
     46 	char *be, *s0;
     47 	size_t len;
     48 #ifdef USE_LOCALE
     49 #ifdef NO_LOCALE_CACHE
     50 	char *decimalpoint = localeconv()->decimal_point;
     51 	size_t dlen = strlen(decimalpoint);
     52 #else
     53 	char *decimalpoint;
     54 	static char *decimalpoint_cache;
     55 	static size_t dlen;
     56 	if (!(s0 = decimalpoint_cache)) {
     57 		s0 = localeconv()->decimal_point;
     58 		dlen = strlen(s0);
     59 		if ((decimalpoint_cache = MALLOC(strlen(s0) + 1)) != NULL) {
     60 			strcpy(decimalpoint_cache, s0);
     61 			s0 = decimalpoint_cache;
     62 			}
     63 		}
     64 	decimalpoint = s0;
     65 #endif
     66 #else
     67 #define dlen 0
     68 #endif
     69 	s0 = s;
     70 	len = (se-s) + dlen + 6; /* 6 = sign + e+dd + trailing null */
     71 	if (blen < len)
     72 		goto ret0;
     73 	be = b + blen - 1;
     74 	if (sign)
     75 		*b++ = '-';
     76 	if (decpt <= -4 || decpt > se - s + 5) {
     77 		*b++ = *s++;
     78 		if (*s) {
     79 #ifdef USE_LOCALE
     80 			while((*b = *decimalpoint++))
     81 				++b;
     82 #else
     83 			*b++ = '.';
     84 #endif
     85 			while((*b = *s++) !=0)
     86 				b++;
     87 			}
     88 		*b++ = 'e';
     89 		/* sprintf(b, "%+.2d", decpt - 1); */
     90 		if (--decpt < 0) {
     91 			*b++ = '-';
     92 			decpt = -decpt;
     93 			}
     94 		else
     95 			*b++ = '+';
     96 		for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10){}
     97 		for(;;) {
     98 			i = decpt / k;
     99 			if (b >= be)
    100 				goto ret0;
    101 			*b++ = i + '0';
    102 			if (--j <= 0)
    103 				break;
    104 			decpt -= i*k;
    105 			decpt *= 10;
    106 			}
    107 		*b = 0;
    108 		}
    109 	else if (decpt <= 0) {
    110 #ifdef USE_LOCALE
    111 		while((*b = *decimalpoint++))
    112 			++b;
    113 #else
    114 		*b++ = '.';
    115 #endif
    116 		if (be < b - decpt + (se - s))
    117 			goto ret0;
    118 		for(; decpt < 0; decpt++)
    119 			*b++ = '0';
    120 		while((*b = *s++) != 0)
    121 			b++;
    122 		}
    123 	else {
    124 		while((*b = *s++) != 0) {
    125 			b++;
    126 			if (--decpt == 0 && *s) {
    127 #ifdef USE_LOCALE
    128 				while(*b = *decimalpoint++)
    129 					++b;
    130 #else
    131 				*b++ = '.';
    132 #endif
    133 				}
    134 			}
    135 		if (b + decpt > be) {
    136  ret0:
    137 			b = 0;
    138 			goto ret;
    139 			}
    140 		for(; decpt > 0; decpt--)
    141 			*b++ = '0';
    142 		*b = 0;
    143 		}
    144  ret:
    145 	freedtoa(s0);
    146 	return b;
    147  	}
    148