atoi.c

Nucleus Common Library for Integrator using ARM Developer Suite

/*************************************************************************
*
*               Copyright Mentor Graphics Corporation 2002
*                         All Rights Reserved.
*
* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS
* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS
* SUBJECT TO LICENSE TERMS.
*
*************************************************************************/

/*************************************************************************
* FILE NAME                                     VERSION
*
*       atoi.c                                  Nucleus Common Library 1.1
*
* DESCRIPTION
*
*       This file contains the implementation of NCL_atoi.
*
* DATA STRUCTURES
*
*       None.
*
* FUNCTIONS
*
*       NCL_atoi
*
* DEPENDENCIES
*
*       ncl.h
*       stdlib.h
*       ctype.h
*       convert.h
*       nucleus.h
*
************************************************************************/

#define NU_NCL_SOURCE_FILE

#include "ncl\inc\ncl.h"
#include "ncl\inc\stdlib.h"
#include "ncl\inc\ctype.h"
#include "ncl\inc\convert.h"
#include "plus\nucleus.h"                                /* MMU Support */

/*************************************************************************
*
*   FUNCTION
*
*       NCL_atoi
*
*   DESCRIPTION
*
*       Converts string of ASCII chars to an integer.
*
*   INPUTS
*
*       nptr                Null-terminated string to be converted.
*
*   OUTPUTS
*
*       int                 Value the string represented.
*
*************************************************************************/

int NCL_atoi (const char *nptr)
{
    register const uchar *ptr = (const uchar *)nptr;
    register uint  num = 0;
    register int   c   = *ptr;
    register int   neg = 0;

    while (NCL_isspace(c))
        c = *++ptr;                       /* skip over whitespace chars */

    if (c == '-')                             /* get an optional sign */
    {
        neg = 1;
        c = *++ptr;
    }
    else
        if (c == '+')
            c = *++ptr;

    while (NCL_isdigit(c))
    {
        num = (10 * num) + (c - '0');
        c = *++ptr;
    }

    if (neg)
    {
        return (SINEGATE(num));
    }

    return ((int) num);
}