/* * 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 2007/07/10 15:04:23 duncan Exp $ */ #include #include "tclInt.h" #include "tclPort.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) CONST 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 CONST char *p; long result; /* * Skip any leading blanks. */ p = string; while (isspace(UCHAR(*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 = (char *) string; } return result; }