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 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <mdb/mdb_stdlib.h>
30 #include <mdb/mdb_string.h>
31 #include <mdb/mdb_modapi.h>
32 #include <mdb/mdb_debug.h>
33
34 #include <sys/types.h>
35 #include <floatingpoint.h>
36 #include <poll.h>
37
38 /*
39 * Post-processing routine for econvert and qeconvert. This function is
40 * called by both doubletos() and longdoubletos() below.
41 */
42 static const char *
fptos(const char * p,char * buf,size_t buflen,int decpt,int sign,char expchr)43 fptos(const char *p, char *buf, size_t buflen, int decpt, int sign, char expchr)
44 {
45 char *q = buf;
46
47 *q++ = sign ? '-' : '+';
48
49 /*
50 * If the initial character is not a digit, the result is a special
51 * identifier such as "NaN" or "Inf"; just copy it verbatim.
52 */
53 if (*p < '0' || *p > '9') {
54 (void) strncpy(q, p, buflen);
55 buf[buflen - 1] = '\0';
56 return (buf);
57 }
58
59 *q++ = *p++;
60 *q++ = '.';
61
62 (void) strcpy(q, p);
63 q += strlen(q);
64 *q++ = expchr;
65
66 if (--decpt < 0) {
67 decpt = -decpt;
68 *q++ = '-';
69 } else
70 *q++ = '+';
71
72 if (decpt < 10)
73 *q++ = '0';
74
75 (void) strcpy(q, numtostr((uint_t)decpt, 10, 0));
76 return (buf);
77 }
78
79 /*
80 * Convert the specified double to a string, and return a pointer to a static
81 * buffer containing the string value. The double is converted using the
82 * same formatting conventions as sprintf(buf, "%+.*e", precision, d). The
83 * expchr parameter specifies the character used to denote the exponent,
84 * and is usually 'e' or 'E'.
85 */
86 const char *
doubletos(double d,int precision,char expchr)87 doubletos(double d, int precision, char expchr)
88 {
89 static char buf[DECIMAL_STRING_LENGTH];
90 char digits[DECIMAL_STRING_LENGTH];
91 int decpt, sign;
92 char *p;
93
94 p = econvert(d, precision + 1, &decpt, &sign, digits);
95 return (fptos(p, buf, sizeof (buf), decpt, sign, expchr));
96 }
97
98 /*
99 * Same as doubletos(), but for long doubles (quad precision floating point).
100 */
101 const char *
longdoubletos(long double * ldp,int precision,char expchr)102 longdoubletos(long double *ldp, int precision, char expchr)
103 {
104 static char buf[DECIMAL_STRING_LENGTH];
105 char digits[DECIMAL_STRING_LENGTH];
106 int decpt, sign;
107 char *p;
108
109 p = qeconvert(ldp, precision + 1, &decpt, &sign, digits);
110 return (fptos(p, buf, sizeof (buf), decpt, sign, expchr));
111 }
112