Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (4.4BSD-Lite2)
Apropos / Subsearch:
optional field

STRTOL(3)                   BSD Programmer's Manual                  STRTOL(3)

     strtol, strtoq - convert string value to a long or quad_t integer

     #include <&lt;stdlib.h>&gt;
     #include <&lt;limits.h>&gt;

     strtol(char *nptr, char **endptr, int base);

     #include <&lt;sys/types.h>&gt;
     #include <&lt;stdlib.h>&gt;
     #include <&lt;limits.h>&gt;

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

     The strtol() function converts the string in nptr to a long 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 deter-
     mined 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 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' represent-
     ing 35.)

     If endptr is non nil, 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.)

     The strtol() function returns the result of the conversion, unless the
     value would underflow or overflow.  If an underflow occurs, strtol() re-
     turns LONG_MIN. If an overflow occurs, strtol() returns LONG_MAX. In both
     cases, errno is set to ERANGE.

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

     atof(3),  atoi(3),  atol(3),  strtod(3),  strtoul(3)

     The strtol() function conforms to ANSI C X3.159-1989 (``ANSI C '').

     Ignores the current locale.

4.4BSD                           June 4, 1993                                1