NAME    [Toc]    [Back]

     atoi - convert ASCII string to integer

SYNOPSIS    [Toc]    [Back]

     #include <stdlib.h>

     int
     atoi(const char *nptr);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

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

CAVEATS    [Toc]    [Back]

     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,
 but strtonum(3) can be used to  convert  numbers  from
strings much
     more safely and easily.

OpenBSD      3.6                           June      4,      1993