STRTOIMAX
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
strtoimax,
strtoumax
--- convert string to integer type
SYNOPSIS
#include <inttypes.h>
intmax_t strtoimax(const char *restrict nptr, char **restrict endptr,
int base);
uintmax_t strtoumax(const char *restrict nptr, char **restrict endptr,
int base);
DESCRIPTION
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.
These functions shall be equivalent to the
strtol(),
strtoll(),
strtoul(),
and
strtoull()
functions, except that the initial portion of the string shall be
converted to
intmax_t
and
uintmax_t
representation, respectively.
RETURN VALUE
These functions shall return the converted value, if any.
If no conversion could be performed, zero shall be returned
and
errno
may be set to
[EINVAL].
If the value of
base
is not supported, 0 shall be returned and
errno
shall be set to
[EINVAL].
If the correct value is outside the range of representable values,
{INTMAX_MAX},
{INTMAX_MIN},
or
{UINTMAX_MAX}
shall be returned (according to the return type and sign of the value,
if any), and
errno
shall be set to
[ERANGE].
ERRORS
These functions shall fail if:
- EINVAL
-
The value of
base
is not supported.
- ERANGE
-
The value to be returned is not representable.
These functions may fail if:
- EINVAL
-
No conversion could be performed.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
Since the value of
*endptr
is unspecified if the value of
base
is not supported, applications should either ensure that
base
has a supported value (0 or between 2 and 36) before the call, or check
for an
[EINVAL]
error before examining
*endptr.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
strtol(),
strtoul()
The Base Definitions volume of POSIX.1-2017,
<inttypes.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .