]>
Commit | Line | Data |
---|---|---|
fea681da MK |
1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
fea681da MK |
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 | .\" |
fea681da MK |
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14 | .\" manual page may be incorrect or out-of-date.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 | .\" |
fea681da MK |
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 |
fea681da MK |
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 Mon Mar 29 22:39:41 1993, David Metcalfe | |
30 | .\" Modified Sat Jul 24 21:38:42 1993, Rik Faith (faith@cs.unc.edu) | |
31 | .\" Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers | |
32 | .\" | |
97986708 | 33 | .TH ATOI 3 2016-03-15 "GNU" "Linux Programmer's Manual" |
fea681da | 34 | .SH NAME |
47aa42e7 | 35 | atoi, atol, atoll \- convert a string to an integer |
fea681da MK |
36 | .SH SYNOPSIS |
37 | .nf | |
38 | .B #include <stdlib.h> | |
68e4db0a | 39 | .PP |
fea681da | 40 | .BI "int atoi(const char *" nptr ); |
fea681da | 41 | .BI "long atol(const char *" nptr ); |
fea681da | 42 | .BI "long long atoll(const char *" nptr ); |
fea681da | 43 | .fi |
68e4db0a | 44 | .PP |
cc4615cc MK |
45 | .in -4n |
46 | Feature Test Macro Requirements for glibc (see | |
47 | .BR feature_test_macros (7)): | |
48 | .in | |
68e4db0a | 49 | .PP |
cc4615cc MK |
50 | .ad l |
51 | .BR atoll (): | |
e0a98111 | 52 | .RS 4 |
38a6fda1 | 53 | _ISOC99_SOURCE || |
2b1b0424 | 54 | || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
e0a98111 MK |
55 | .RE |
56 | .ad | |
fea681da | 57 | .SH DESCRIPTION |
60a90ecd MK |
58 | The |
59 | .BR atoi () | |
60 | function converts the initial portion of the string | |
fea681da MK |
61 | pointed to by \fInptr\fP to |
62 | .IR int . | |
d9bfdb9c | 63 | The behavior is the same as |
ba39b288 | 64 | .PP |
2147452b | 65 | .in +4n |
ba39b288 | 66 | .EX |
13f78d96 | 67 | strtol(nptr, NULL, 10); |
ba39b288 | 68 | .EE |
2147452b | 69 | .in |
ba39b288 | 70 | .PP |
60a90ecd MK |
71 | except that |
72 | .BR atoi () | |
73 | does not detect errors. | |
fea681da | 74 | .PP |
60a90ecd MK |
75 | The |
76 | .BR atol () | |
77 | and | |
78 | .BR atoll () | |
79 | functions behave the same as | |
80 | .BR atoi (), | |
81 | except that they convert the initial portion of the | |
fea681da | 82 | string to their return type of \fIlong\fP or \fIlong long\fP. |
47297adb | 83 | .SH RETURN VALUE |
fea681da | 84 | The converted value. |
843204f8 | 85 | .SH ATTRIBUTES |
fe41ec5e PH |
86 | For an explanation of the terms used in this section, see |
87 | .BR attributes (7). | |
88 | .TS | |
89 | allbox; | |
90 | lbw23 lb lb | |
91 | l l l. | |
92 | Interface Attribute Value | |
93 | T{ | |
843204f8 PH |
94 | .BR atoi (), |
95 | .BR atol (), | |
843204f8 | 96 | .BR atoll () |
fe41ec5e PH |
97 | T} Thread safety MT-Safe locale |
98 | .TE | |
47297adb | 99 | .SH CONFORMING TO |
4e73f286 | 100 | POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD. |
68e1685c | 101 | C89 and |
60a90ecd MK |
102 | POSIX.1-1996 include the functions |
103 | .BR atoi () | |
104 | and | |
105 | .BR atol () | |
106 | only. | |
fea681da | 107 | .SH NOTES |
ee5f0bfd | 108 | Linux libc provided |
60a90ecd | 109 | .BR atoq () |
ee5f0bfd MK |
110 | as an obsolete name for |
111 | .BR atoll (); | |
112 | .BR atoq () | |
113 | is not provided by glibc. | |
114 | .\" The | |
115 | .\" .BR atoll () | |
116 | .\" function is present in glibc 2 since version 2.0.2, but | |
117 | .\" not in libc4 or libc5. | |
47297adb | 118 | .SH SEE ALSO |
fea681da MK |
119 | .BR atof (3), |
120 | .BR strtod (3), | |
121 | .BR strtol (3), | |
122 | .BR strtoul (3) |