atoi(3) - NetBSD Manual Pages

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ATOI(3)                 NetBSD 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, 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 han-
     dles strings containing trailing extra characters (like ``123abc'')
     poorly.  Careful use of strtol(3) and strtoul(3) can alleviate these
     problems.

NetBSD 10.0                      June 13, 2018                     NetBSD 10.0