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
g__fmt(b,s,se,decpt,sign,blen)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