atoi(3) [netbsd man page]

ATOI(3) 						   BSD Library Functions Manual 						   ATOI(3)

NAME

     atoi -- convert ASCII string to integer

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     int
     atoi(const char *nptr);

DESCRIPTION

     The atoi() function converts the initial portion of the string pointed to by nptr to integer representation.

     It is equivalent to:

	   (int)strtol(nptr, (char **)NULL, 10);

SEE ALSO

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

STANDARDS

     The atoi() function conforms to ANSI X3.159-1989 (``ANSI C89'').

CAVEATS

     atoi does no overflow checking, handles unsigned numbers poorly, and handles strings containing trailing extra characters (like ``123abc'')
     poorly.  Careful use of strtol(3) and strtoul(3) can alleviate these problems.

BSD
								   June 4, 1993 							       BSD

ATOI(3) 						     Linux Programmer's Manual							   ATOI(3)

NAME

       atoi, atol, atoll, atoq - convert a string to an integer.

SYNOPSIS

       #include <stdlib.h>

       int atoi(const char *nptr);
       long atol(const char *nptr);
       long long atoll(const char *nptr);
       long long atoq(const char *nptr);

DESCRIPTION

       The atoi() function converts the initial portion of the string pointed to by nptr to int.  The behaviour is the same as

	      strtol(nptr, (char **)NULL, 10);

       except that atoi() does not detect errors.

       The atol() and atoll() functions behave the same as atoi(), except that they convert the initial portion of the string to their return type
       of long or long long.  atoq() is an obsolete name for atoll().

RETURN VALUE

       The converted value.

CONFORMING TO

       SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899.	ISO/IEC 9899:1990 (C89) and POSIX.1 (1996 edition) include the functions atoi() and  atol()  only;
       C99 adds the function atoll().

NOTES

       The  non-standard  atoq() function is not present in libc 4.6.27 or glibc 2, but is present in libc5 and libc 4.7 (though only as an inline
       function in <stdlib.h> until libc 5.4.44).  The atoll() function is present in glibc 2 since version 2.0.2, but not in libc4 or libc5.

SEE ALSO

       atof(3), strtod(3), strtol(3), strtoul(3)

GNU
								    2000-12-17								   ATOI(3)