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
__g__fmt(char * b,char * s,char * se,int decpt,ULong sign,size_t blen)38 char *__g__fmt (char *b, char *s, char *se, int decpt, ULong sign, size_t blen)
39 {
40 int i, j, k;
41 char *be, *s0;
42 size_t len;
43 #ifdef USE_LOCALE
44 #ifdef NO_LOCALE_CACHE
45 char *decimalpoint = localeconv()->decimal_point;
46 size_t dlen = strlen(decimalpoint);
47 #else
48 char *decimalpoint;
49 static char *decimalpoint_cache;
50 static size_t dlen;
51 if (!(s0 = decimalpoint_cache)) {
52 s0 = localeconv()->decimal_point;
53 dlen = strlen(s0);
54 if ((decimalpoint_cache = (char*)MALLOC(strlen(s0) + 1))) {
55 strcpy(decimalpoint_cache, s0);
56 s0 = decimalpoint_cache;
57 }
58 }
59 decimalpoint = s0;
60 #endif
61 #else
62 #define dlen 0
63 #endif
64 s0 = s;
65 len = (se-s) + dlen + 6; /* 6 = sign + e+dd + trailing null */
66 if (blen < len)
67 goto ret0;
68 be = b + blen - 1;
69 if (sign)
70 *b++ = '-';
71 if (decpt <= -4 || decpt > se - s + 5) {
72 *b++ = *s++;
73 if (*s) {
74 #ifdef USE_LOCALE
75 while((*b = *decimalpoint++))
76 ++b;
77 #else
78 *b++ = '.';
79 #endif
80 while((*b = *s++) !=0)
81 b++;
82 }
83 *b++ = 'e';
84 /* sprintf(b, "%+.2d", decpt - 1); */
85 if (--decpt < 0) {
86 *b++ = '-';
87 decpt = -decpt;
88 }
89 else
90 *b++ = '+';
91 for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10){}
92 for(;;) {
93 i = decpt / k;
94 if (b >= be)
95 goto ret0;
96 *b++ = i + '0';
97 if (--j <= 0)
98 break;
99 decpt -= i*k;
100 decpt *= 10;
101 }
102 *b = 0;
103 }
104 else if (decpt <= 0) {
105 #ifdef USE_LOCALE
106 while((*b = *decimalpoint++))
107 ++b;
108 #else
109 *b++ = '.';
110 #endif
111 if (be < b - decpt + (se - s))
112 goto ret0;
113 for(; decpt < 0; decpt++)
114 *b++ = '0';
115 while((*b = *s++) != 0)
116 b++;
117 }
118 else {
119 while((*b = *s++) != 0) {
120 b++;
121 if (--decpt == 0 && *s) {
122 #ifdef USE_LOCALE
123 while((*b = *decimalpoint++))
124 ++b;
125 #else
126 *b++ = '.';
127 #endif
128 }
129 }
130 if (b + decpt > be) {
131 ret0:
132 b = 0;
133 goto ret;
134 }
135 for(; decpt > 0; decpt--)
136 *b++ = '0';
137 *b = 0;
138 }
139 ret:
140 __freedtoa(s0);
141 return b;
142 }
143