atoi man page on Oracle

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ATOI(3P)		   POSIX Programmer's Manual		      ATOI(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       atoi - convert a string to an integer

       #include <stdlib.h>

       int atoi(const char *str);

       The call atoi(str) shall be equivalent to:

	      (int) strtol(str, (char **)NULL, 10)

       except that the handling of errors may differ. If the value  cannot  be
       represented, the behavior is undefined.

       The  atoi()  function shall return the converted value if the value can
       be represented.

       No errors are defined.

       The following sections are informative.

   Converting an Argument
       The following example checks for proper usage of the program. If	 there
       is  an  argument	 and the decimal conversion of this argument (obtained
       using atoi()) is greater than 0, then the program has a valid number of
       minutes to wait for an event.

	      #include <stdlib.h>
	      #include <stdio.h>
	      int minutes_to_event;
	      if (argc < 2 || ((minutes_to_event = atoi (argv[1]))) <= 0) {
		 fprintf(stderr, "Usage: %s minutes\n", argv[0]); exit(1);

       The  atoi() function is subsumed by strtol() but is retained because it
       is used extensively in existing code. If the number is not known to  be
       in  range,  strtol()  should  be used because atoi() is not required to
       perform any error checking.



       strtol(),  the  Base  Definitions   volume   of	 IEEE Std 1003.1-2001,

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at .

IEEE/The Open Group		     2003			      ATOI(3P)

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