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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
25 | .\" References consulted: | |
26 | .\" Linux libc source code | |
27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
28 | .\" 386BSD man pages | |
29 | .\" Modified Sat Jul 24 19:32:25 1993 by Rik Faith (faith@cs.unc.edu) | |
4b8c67d9 | 30 | .TH GCVT 3 2017-09-15 "" "Linux Programmer's Manual" |
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31 | .SH NAME |
32 | gcvt \- convert a floating-point number to a string | |
33 | .SH SYNOPSIS | |
34 | .nf | |
35 | .B #include <stdlib.h> | |
68e4db0a | 36 | .PP |
5f69515b | 37 | .BI "char *gcvt(double " number ", int " ndigit ", char *" buf ); |
fea681da | 38 | .fi |
68e4db0a | 39 | .PP |
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40 | .in -4n |
41 | Feature Test Macro Requirements for glibc (see | |
42 | .BR feature_test_macros (7)): | |
43 | .in | |
68e4db0a | 44 | .PP |
cc4615cc | 45 | .BR gcvt (): |
4943de06 | 46 | .ad l |
2a274afb | 47 | .PD 0 |
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48 | .RS 4 |
49 | .TP 4 | |
50 | Since glibc 2.12: | |
51 | .nf | |
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52 | (_XOPEN_SOURCE\ >=\ 500) ! (_POSIX_C_SOURCE\ >=\ 200112L) |
53 | || /* Glibc since 2.19: */ _DEFAULT_SOURCE | |
54 | || /* Glibc versions <= 2.19: */ _SVID_SOURCE | |
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55 | .fi |
56 | .TP 4 | |
57 | Before glibc 2.12: | |
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58 | _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 |
59 | .\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED | |
4943de06 | 60 | .RE |
2a274afb | 61 | .PD |
4943de06 | 62 | .ad b |
fea681da | 63 | .SH DESCRIPTION |
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64 | The |
65 | .BR gcvt () | |
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66 | function converts \fInumber\fP to a minimal length null-terminated |
67 | ASCII string and stores the result in \fIbuf\fP. | |
1c44bd5b | 68 | It produces \fIndigit\fP significant digits in either |
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69 | .BR printf (3) |
70 | F format or E format. | |
47297adb | 71 | .SH RETURN VALUE |
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72 | The |
73 | .BR gcvt () | |
74 | function returns the address of the string pointed to | |
fea681da | 75 | by \fIbuf\fP. |
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76 | .SH ATTRIBUTES |
77 | For an explanation of the terms used in this section, see | |
78 | .BR attributes (7). | |
79 | .TS | |
80 | allbox; | |
81 | lb lb lb | |
82 | l l l. | |
83 | Interface Attribute Value | |
84 | T{ | |
85 | .BR gcvt () | |
86 | T} Thread safety MT-Safe | |
87 | .TE | |
847e0d88 | 88 | .sp 1 |
47297adb | 89 | .SH CONFORMING TO |
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90 | Marked as LEGACY in POSIX.1-2001. |
91 | POSIX.1-2008 removes the specification of | |
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92 | .BR gcvt (), |
93 | recommending the use of | |
2b2581ee | 94 | .BR sprintf (3) |
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95 | instead (though |
96 | .BR snprintf (3) | |
97 | may be preferable). | |
47297adb | 98 | .SH SEE ALSO |
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99 | .BR ecvt (3), |
100 | .BR fcvt (3), | |
101 | .BR sprintf (3) |