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/*
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* strtoll.c --
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*
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* Source code for the "strtoll" library procedure.
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*
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* Copyright (c) 1988 The Regents of the University of California.
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* Copyright (c) 1994 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: strtoll.c,v 1.5 2002/02/24 02:53:25 dgp Exp $
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*/
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#include "tcl.h"
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#include "tclPort.h"
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#include <ctype.h>
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#define TCL_WIDEINT_MAX (((Tcl_WideUInt)Tcl_LongAsWide(-1))>>1)
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/*
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*----------------------------------------------------------------------
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*
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* strtoll --
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*
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* Convert an ASCII string into an integer.
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*
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* Results:
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* The return value is the integer equivalent of string. If endPtr
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* is non-NULL, then *endPtr is filled in with the character
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* after the last one that was part of the integer. If string
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* doesn't contain a valid integer value, then zero is returned
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* and *endPtr is set to string.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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#if TCL_WIDE_INT_IS_LONG
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long long
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#else
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Tcl_WideInt
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#endif
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strtoll(string, endPtr, base)
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CONST char *string; /* String of ASCII digits, possibly
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* preceded by white space. For bases
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* greater than 10, either lower- or
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* upper-case digits may be used.
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*/
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char **endPtr; /* Where to store address of terminating
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* character, or NULL. */
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int base; /* Base for conversion. Must be less
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* than 37. If 0, then the base is chosen
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* from the leading characters of string:
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* "0x" means hex, "0" means octal, anything
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* else means decimal.
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*/
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{
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register CONST char *p;
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Tcl_WideInt result = Tcl_LongAsWide(0);
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Tcl_WideUInt uwResult;
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/*
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* Skip any leading blanks.
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*/
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p = string;
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while (isspace(UCHAR(*p))) {
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p += 1;
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}
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/*
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* Check for a sign.
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*/
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errno = 0;
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if (*p == '-') {
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p += 1;
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uwResult = strtoull(p, endPtr, base);
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if (errno != ERANGE) {
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if (uwResult > TCL_WIDEINT_MAX+1) {
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errno = ERANGE;
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return Tcl_LongAsWide(-1);
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} else if (uwResult > TCL_WIDEINT_MAX) {
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return ~((Tcl_WideInt)TCL_WIDEINT_MAX);
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} else {
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result = -((Tcl_WideInt) uwResult);
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}
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}
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} else {
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if (*p == '+') {
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p += 1;
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}
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uwResult = strtoull(p, endPtr, base);
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if (errno != ERANGE) {
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if (uwResult > TCL_WIDEINT_MAX) {
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errno = ERANGE;
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return Tcl_LongAsWide(-1);
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} else {
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result = uwResult;
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}
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}
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}
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if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
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*endPtr = (char *) string;
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}
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return result;
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}
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