STRTOL(3)              FreeBSD Library Functions Manual              STRTOL(3)

NAME
     strtol, strtoll, strtoimax, strtoq - convert a string value to a long,
     long long, intmax_t or quad_t integer

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>
     #include <limits.h>

     long
     strtol(const char * restrict nptr, char ** restrict endptr, int base);

     long long
     strtoll(const char * restrict nptr, char ** restrict endptr, int base);

     #include <inttypes.h>

     intmax_t
     strtoimax(const char * restrict nptr, char ** restrict endptr, int base);

     #include <sys/types.h>
     #include <stdlib.h>
     #include <limits.h>

     quad_t
     strtoq(const char *nptr, char **endptr, int base);

DESCRIPTION
     The strtol() function converts the string in nptr to a long value.  The
     strtoll() function converts the string in nptr to a long long value.  The
     strtoimax() function converts the string in nptr to an intmax_t value.
     The strtoq() function converts the string in nptr to a quad_t value.  The
     conversion is done according to the given base, which must be between 2
     and 36 inclusive, or be the special value 0.

     The string may 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, long long, intmax_t
     or quad_t 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, however, strtol()
     stores the original value of nptr in *endptr.  (Thus, if *nptr is not
     `\0' but **endptr is `\0' on return, the entire string was valid.)

RETURN VALUES
     The strtol(), strtoll(), strtoimax() and strtoq() functions return the
     result of the conversion, unless the value would underflow or overflow.
     If no conversion could be performed, 0 is returned and the global
     variable errno is set to EINVAL (the last feature is not portable across
     all platforms).  If an overflow or underflow occurs, errno is set to
     ERANGE and the function return value is clamped according to the
     following table.

           Function         underflow        overflow
           strtol()         LONG_MIN         LONG_MAX
           strtoll()        LLONG_MIN        LLONG_MAX
           strtoimax()      INTMAX_MIN       INTMAX_MAX
           strtoq()         LLONG_MIN        LLONG_MAX

ERRORS
     [EINVAL]           The value of base is not supported or no conversion
                        could be performed (the last feature is not portable
                        across all platforms).

     [ERANGE]           The given string was out of range; the value converted
                        has been clamped.

SEE ALSO
     atof(3), atoi(3), atol(3), strtod(3), strtonum(3), strtoul(3), wcstol(3)

STANDARDS
     The strtol() function conforms to ISO/IEC 9899:1990 ("ISO C90").  The
     strtoll() and strtoimax() functions conform to ISO/IEC 9899:1999
     ("ISO C99").  The BSD strtoq() function is deprecated.

FreeBSD 13.1-RELEASE-p6        November 28, 2001       FreeBSD 13.1-RELEASE-p6