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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
commit | 399644e47874bff147afb19c89228901ac39340e (patch) | |
tree | 1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man3/atoi.3 | |
parent | Initial commit. (diff) | |
download | manpages-399644e47874bff147afb19c89228901ac39340e.tar.xz manpages-399644e47874bff147afb19c89228901ac39340e.zip |
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/atoi.3')
-rw-r--r-- | man3/atoi.3 | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/man3/atoi.3 b/man3/atoi.3 new file mode 100644 index 0000000..d1d32f5 --- /dev/null +++ b/man3/atoi.3 @@ -0,0 +1,126 @@ +'\" t +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified Mon Mar 29 22:39:41 1993, David Metcalfe +.\" Modified Sat Jul 24 21:38:42 1993, Rik Faith (faith@cs.unc.edu) +.\" Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers +.\" +.TH atoi 3 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +atoi, atol, atoll \- convert a string to an integer +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <stdlib.h> +.PP +.BI "int atoi(const char *" nptr ); +.BI "long atol(const char *" nptr ); +.BI "long long atoll(const char *" nptr ); +.fi +.PP +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.PP +.BR atoll (): +.nf + _ISOC99_SOURCE + || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE +.fi +.SH DESCRIPTION +The +.BR atoi () +function converts the initial portion of the string +pointed to by \fInptr\fP to +.IR int . +The behavior is the same as +.PP +.in +4n +.EX +strtol(nptr, NULL, 10); +.EE +.in +.PP +except that +.BR atoi () +does not detect errors. +.PP +The +.BR atol () +and +.BR atoll () +functions behave the same as +.BR atoi (), +except that they convert the initial portion of the +string to their return type of \fIlong\fP or \fIlong long\fP. +.SH RETURN VALUE +The converted value or 0 on error. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR atoi (), +.BR atol (), +.BR atoll () +T} Thread safety MT-Safe locale +.TE +.sp 1 +.SH VERSIONS +POSIX.1 leaves the return value of +.BR atoi () +on error unspecified. +On glibc, musl libc, and uClibc, 0 is returned on error. +.SH STANDARDS +C11, POSIX.1-2008. +.SH HISTORY +C99, POSIX.1-2001, SVr4, 4.3BSD. +.PP +C89 and +POSIX.1-1996 include the functions +.BR atoi () +and +.BR atol () +only. +.\" .SH NOTES +.\" Linux libc provided +.\" .BR atoq () +.\" as an obsolete name for +.\" .BR atoll (); +.\" .BR atoq () +.\" is not provided by glibc. +.\" The +.\" .BR atoll () +.\" function is present since glibc 2.0.2, but +.\" not in libc4 or libc5. +.SH BUGS +.I errno +is not set on error so there is no way to distinguish between 0 as an +error and as the converted value. +No checks for overflow or underflow are done. +Only base-10 input can be converted. +It is recommended to instead use the +.BR strtol () +and +.BR strtoul () +family of functions in new programs. +.SH SEE ALSO +.BR atof (3), +.BR strtod (3), +.BR strtol (3), +.BR strtoul (3) |