_strtol.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
*
*       _strtol.c                               Nucleus Common Library 1.1
*
* DESCRIPTION
*
*       This file contains the implementation of NCL_strtol.
*
* DATA STRUCTURES
*
*       None.
*
* FUNCTIONS
*
*       NCL_strtol
*
* DEPENDENCIES
*
*       ncl.h
*       abbr.h
*       errno.h
*       convert.h
*       nucleus.h
*
************************************************************************/

#define NU_NCL_SOURCE_FILE

#include "ncl\inc\ncl.h"
#include "ncl\inc\abbr.h"                                    /* rcchar */
#include "ncl\inc\errno.h"
#include "ncl\inc\convert.h"
#include "plus\nucleus.h"                                /* MMU Support */

/*************************************************************************
*
*   FUNCTION
*
*       NCL__strtol
*
*   DESCRIPTION
*
*       This routine is used to scan a single long integer from at most
*       'width' characters in a string.  If 'width' is negative, the
*       number of characters scanned is unlimited.  The integer may be
*       preceeded by an optional sign character, but whitespace
*       characters are invalid.  In other respects, it acts like "strtol".
*
*   INPUTS
*
*       nptr                Null-terminated string to convert
*       base                Number system (binary, hex, octal, etc...)
*       width               The most chars in the string this function
*                             will operate upon.  If negative, there is
*                             no limit for this function.
*       max                 Largest value that will not cause an overflow
*
*   OUTPUTS
*
*       long                Value the string represents
*
*************************************************************************/

long NCL__strtol (const char *nptr, char **endptr, int base, int width)
{
    rcchar *ptr = nptr;
    ulong  uvalue;
    long   svalue;
    int    neg = 0;
    char   *eptr;
    NU_SUPERV_USER_VARIABLES

    if (*ptr == '-')
    {
        neg = 1;
        goto do_sign;
    }    /* get optional sign */
    if (*ptr == '+')
    {
        do_sign:
        if (width == 0)
        {
            eptr = (char *)nptr;
            svalue = 0L;
            goto exit;
        }
        if (width > 0)
            --width;
        ++ptr;
    }

    switch (NCL__str2ul (&uvalue, ptr, &eptr, width, base))
    {
        case S2L_ERROR:
            svalue = 0L;
            eptr = (char *)nptr;
            if (width && *ptr == '0') /* "0x?" is valid */
            eptr = (char *)(ptr + 1);
            break;

        case S2L_VALID:
            if (neg)
            {
                if (uvalue > - (unsigned long) LONG_MIN)
                    goto overflow;
                svalue = SNEGATE(uvalue);
            }
            else  /* positive */
            {
                if (uvalue >   (unsigned long) LONG_MAX)
                    goto overflow;
                svalue = (long) uvalue;
            }
            break;

        case S2L_OVFLW:
overflow:
            svalue = ((neg) ? LONG_MIN : LONG_MAX);
            NU_SUPERVISOR_MODE();
            errno = ERANGE;
            NU_USER_MODE();
            break;
    }

exit:
    if (endptr != (char**)0)
        *endptr = eptr;

    return (svalue);
}