NAME
atol atoll
— convert a string to a long integer
SYNOPSIS
#include
<stdlib.h>
long atol(const char *str); long long atoll(const char *nptr);
DESCRIPTION
[CX] 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.1-2008 defers to the ISO C standard.
The call atol (
str) shall be
equivalent to:
strtol(str, (char **)NULL, 10)
The call atoll ( nptr) shall be equivalent to:
strtoll(nptr, (char **)NULL, 10)
except that the handling of errors may differ. If the value cannot be represented, the behavior is undefined.
RETURN VALUE
These functions shall return the converted value if the value can be represented.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
The atol () function is subsumed by
strtol(3) but is retained because it is used extensively
in existing code. If the number is not known to be in range,
strtol(3) should be used because
atol () is not required to perform any error
checking.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XBD <stdlib.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
Issue 6
The atoll () function is added for alignment with the ISO/IEC 9899:1999 (“ISO C99”) standard.
Issue 7
SD5-XSH-ERN-61 is applied, correcting the DESCRIPTION of atoll ().