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/*

 * strtol.c --

 *

 *      Source code for the "strtol" library procedure.

 *

 * Copyright (c) 1988 The Regents of the University of California.

 * Copyright (c) 1994 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * RCS: @(#) $Id: strtol.c,v 1.1.1.1 2002-01-16 10:25:23 markom Exp $

 */

#include <ctype.h>

/*

 *----------------------------------------------------------------------

 *

 * strtol --

 *

 *      Convert an ASCII string into an integer.

 *

 * Results:

 *      The return value is the integer equivalent of string.  If endPtr

 *      is non-NULL, then *endPtr is filled in with the character

 *      after the last one that was part of the integer.  If string

 *      doesn't contain a valid integer value, then zero is returned

 *      and *endPtr is set to string.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

long int

strtol(string, endPtr, base)

    char *string;               /* String of ASCII digits, possibly

                                 * preceded by white space.  For bases

                                 * greater than 10, either lower- or

                                 * upper-case digits may be used.

                                 */

    char **endPtr;              /* Where to store address of terminating

                                 * character, or NULL. */

    int base;                   /* Base for conversion.  Must be less

                                 * than 37.  If 0, then the base is chosen

                                 * from the leading characters of string:

                                 * "0x" means hex, "0" means octal, anything

                                 * else means decimal.

                                 */

{

    register char *p;

    int result;

    /*

     * Skip any leading blanks.

     */

    p = string;

    while (isspace(*p)) {

        p += 1;

    }

    /*

     * Check for a sign.

     */

    if (*p == '-') {

        p += 1;

        result = -(strtoul(p, endPtr, base));

    } else {

        if (*p == '+') {

            p += 1;

        }

        result = strtoul(p, endPtr, base);

    }

    if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {

        *endPtr = string;

    }

    return result;

}