1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <mdb/mdb_stdlib.h>
28 #include <mdb/mdb_string.h>
29 #include <mdb/mdb_modapi.h>
30 #include <mdb/mdb_debug.h>
31
32 #include <sys/types.h>
33 #include <floatingpoint.h>
34 #include <poll.h>
35
36 /*
37 * Post-processing routine for econvert and qeconvert. This function is
38 * called by both doubletos() and longdoubletos() below.
39 */
40 static const char *
fptos(const char * p,char * buf,size_t buflen,int decpt,int sign,char expchr)41 fptos(const char *p, char *buf, size_t buflen, int decpt, int sign, char expchr)
42 {
43 char *q = buf;
44
45 *q++ = sign ? '-' : '+';
46
47 /*
48 * If the initial character is not a digit, the result is a special
49 * identifier such as "NaN" or "Inf"; just copy it verbatim.
50 */
51 if (*p < '0' || *p > '9') {
52 (void) strncpy(q, p, buflen);
53 buf[buflen - 1] = '\0';
54 return (buf);
55 }
56
57 *q++ = *p++;
58 *q++ = '.';
59
60 (void) strcpy(q, p);
61 q += strlen(q);
62 *q++ = expchr;
63
64 if (--decpt < 0) {
65 decpt = -decpt;
66 *q++ = '-';
67 } else
68 *q++ = '+';
69
70 if (decpt < 10)
71 *q++ = '0';
72
73 (void) strcpy(q, numtostr((uint_t)decpt, 10, 0));
74 return (buf);
75 }
76
77 /*
78 * Convert the specified double to a string, and return a pointer to a static
79 * buffer containing the string value. The double is converted using the
80 * same formatting conventions as sprintf(buf, "%+.*e", precision, d). The
81 * expchr parameter specifies the character used to denote the exponent,
82 * and is usually 'e' or 'E'.
83 */
84 const char *
doubletos(double d,int precision,char expchr)85 doubletos(double d, int precision, char expchr)
86 {
87 static char buf[DECIMAL_STRING_LENGTH];
88 char digits[DECIMAL_STRING_LENGTH];
89 int decpt, sign;
90 char *p;
91
92 p = econvert(d, precision + 1, &decpt, &sign, digits);
93 return (fptos(p, buf, sizeof (buf), decpt, sign, expchr));
94 }
95
96 /*
97 * Same as doubletos(), but for long doubles (quad precision floating point).
98 */
99 const char *
longdoubletos(long double * ldp,int precision,char expchr)100 longdoubletos(long double *ldp, int precision, char expchr)
101 {
102 static char buf[DECIMAL_STRING_LENGTH];
103 char digits[DECIMAL_STRING_LENGTH];
104 int decpt, sign;
105 char *p;
106
107 p = qeconvert(ldp, precision + 1, &decpt, &sign, digits);
108 return (fptos(p, buf, sizeof (buf), decpt, sign, expchr));
109 }
110