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Full Discussion: Best way to axe N bytes from the right?
Top Forums Programming Best way to axe N bytes from the right? Post 302912515 by Don Cragun on Friday 8th of August 2014 06:22:53 PM
Old 08-08-2014
You haven't said what system you're using, so I can't check your man pages, but on most systems, the atoi() man page will say that atoi(ptr) behaves like (int)strtol(str, (char **)NULL, 10) and the strtol() man page clearly states that it skips over leading whitespace and then (with the arguments specified) converts a string of digits with an optional leading + or - to an integer stopping at the 1st non-digit character it finds.

Try something like:
Code:
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
int
returnInt(char *in) {
	char	*p;

	for(p = in; *p && !isdigit(*p); p++);
	return(atoi(p));
}

int
main(int argc, char *argv[]) {
	int	i;

	for(i = 1; i < argc; i++)
		printf("returnInt(\"%s\") returned %d\n", argv[i], 
			returnInt(argv[i]));
	return 0;
}

which when compiled and linked to produce a program named a.out and invoked as:
Code:
a.out abc.123.text def456xyz 789 abcdef ""

produces the output:
Code:
returnInt("abc.123.text") returned 123
returnInt("def456xyz") returned 456
returnInt("789") returned 789
returnInt("abcdef") returned 0
returnInt("") returned 0

Is this something like what you wanted to do?
 

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LEARN ABOUT HPUX

updaters

updaters(1M)															      updaters(1M)

NAME

       updaters - configuration file for NIS updating

SYNOPSIS

   Remarks
       The  Network  Information  Service  (NIS) was formerly known as Yellow Pages (YP).  The functionality of the two remains the same; only the
       name has changed.

DESCRIPTION

       is a makefile used for updating the Network Information Service (NIS) databases.  Databases can be updated only if the network  is  secure,
       that is, only if there is a NIS database ( The default script will update only the map.

       An  entry in the file is a make target for a particular NIS database.  For example, if you wanted to add to this script, you would create a
       make target named passwd.byname with the command to update that database.  See udpublickey(1M).

       The information necessary to make the update is passed to the update command through standard input.  The information passed  is  described
       below.  All items are followed by a NEW LINE except for Actual bytes of key and Actual bytes of data.

	      Network name of client wishing to make the update (a string)

	      Kind of update (an integer)

	      Number of bytes in key (an integer)

	      Actual bytes of key

	      Number of bytes in data (an integer)

	      Actual bytes of data

       After  receiving  this  information through standard input, the command to update the particular database should decide whether the user is
       allowed to make the requested change.

       If not, the command should exit with the status

       If the user is allowed to make the change, the command should make the change and exit with a status of zero.

       If there are any errors that may prevent the updater from making the change, it should exit with the status that matches a valid NIS  error
       code described in

AUTHOR

       was developed by Sun Microsystems, Inc.

SEE ALSO

       make(1), newkey(1M), rpc.ypupdated(1M), udpublickey(1M), publickey(4).

																      updaters(1M)
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