STRTOL (3)
convert a string to a long integer.
SYNOPSIS
#include <stdlib.h>
long int strtol(const char * nptr , char ** endptr , int base );
DESCRIPTION
The strtol() function converts the string in nptr to a
long integer value according to the given base, which must be
between 2 and 36 inclusive, or be the special value 0.
The string must begin with an arbitrary amount of white space (as
determined by
isspace (3))
followed by a single optional `+' or `-'
sign. If base is zero or 16, the string may then include a
`0x' prefix, and the number will be read in base 16; otherwise, a
zero base is taken as 10 (decimal) unless the next character
is `0', in which case it is taken as 8 (octal).
The remainder of the string is converted to a long int value in the
obvious manner, stopping at the first character which is not a valid
digit in the given base. (In bases above 10, the letter `A' in
either upper or lower case represents 10, `B' represents 11, and so
forth, with `Z' representing 35.)
If endptr is not NULL, strtol() stores the address of the
first invalid character in *endptr. If there were no digits at
all, strtol() stores the original value of nptr in
*endptr. (Thus, if *nptr is not `\\0' but **endptr
is `\\0' on return, the entire string is valid.)
RETURN VALUE
The strtol() function returns the result of the conversion,
unless the value would underflow or overflow. If an underflow occurs,
strtol() returns LONG_MIN. If an overflow occurs, strtol()
returns LONG_MAX. In both cases, errno is set to ERANGE.
ERRORS
ERANGE
The given string was out of range; the value converted has been clamped.
CONFORMING TO
SVID 3, BSD 4.3, ISO 9899
SEE ALSO
BUGS
Ignores the current locale.
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