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Annotation of researchv10dc/cmd/worm/scsi/tcl/strtol.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * strtol.c --
        !             3:  *
        !             4:  *     Source code for the "strtol" library procedure.
        !             5:  *
        !             6:  * Copyright 1988 Regents of the University of California
        !             7:  * Permission to use, copy, modify, and distribute this
        !             8:  * software and its documentation for any purpose and without
        !             9:  * fee is hereby granted, provided that the above copyright
        !            10:  * notice appear in all copies.  The University of California
        !            11:  * makes no representations about the suitability of this
        !            12:  * software for any purpose.  It is provided "as is" without
        !            13:  * express or implied warranty.
        !            14:  */
        !            15: 
        !            16: #ifndef lint
        !            17: static char rcsid[] = "$Header: /sprite/src/lib/c/stdlib/RCS/strtol.c,v 1.4 89/03/22 00:47:30 rab Exp $ SPRITE (Berkeley)";
        !            18: #endif /* not lint */
        !            19: 
        !            20: #include <stdlib.h>
        !            21: #include <ctype.h>
        !            22: 
        !            23: 
        !            24: /*
        !            25:  *----------------------------------------------------------------------
        !            26:  *
        !            27:  * strtol --
        !            28:  *
        !            29:  *     Convert an ASCII string into an integer.
        !            30:  *
        !            31:  * Results:
        !            32:  *     The return value is the integer equivalent of string.  If endPtr
        !            33:  *     is non-NULL, then *endPtr is filled in with the character
        !            34:  *     after the last one that was part of the integer.  If string
        !            35:  *     doesn't contain a valid integer value, then zero is returned
        !            36:  *     and *endPtr is set to string.
        !            37:  *
        !            38:  * Side effects:
        !            39:  *     None.
        !            40:  *
        !            41:  *----------------------------------------------------------------------
        !            42:  */
        !            43: 
        !            44: long int
        !            45: strtol(string, endPtr, base)
        !            46:     char *string;              /* String of ASCII digits, possibly
        !            47:                                 * preceded by white space.  For bases
        !            48:                                 * greater than 10, either lower- or
        !            49:                                 * upper-case digits may be used.
        !            50:                                 */
        !            51:     char **endPtr;             /* Where to store address of terminating
        !            52:                                 * character, or NULL. */
        !            53:     int base;                  /* Base for conversion.  Must be less
        !            54:                                 * than 37.  If 0, then the base is chosen
        !            55:                                 * from the leading characters of string:
        !            56:                                 * "0x" means hex, "0" means octal, anything
        !            57:                                 * else means decimal.
        !            58:                                 */
        !            59: {
        !            60:     register char *p;
        !            61:     int result;
        !            62: 
        !            63:     /*
        !            64:      * Skip any leading blanks.
        !            65:      */
        !            66: 
        !            67:     p = string;
        !            68:     while (isspace(*p)) {
        !            69:        p += 1;
        !            70:     }
        !            71: 
        !            72:     /*
        !            73:      * Check for a sign.
        !            74:      */
        !            75: 
        !            76:     if (*p == '-') {
        !            77:        p += 1;
        !            78:        result = -(strtoul(p, endPtr, base));
        !            79:     } else {
        !            80:        if (*p == '+') {
        !            81:            p += 1;
        !            82:        }
        !            83:        result = strtoul(p, endPtr, base);
        !            84:     }
        !            85:     if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
        !            86:        *endPtr = string;
        !            87:     }
        !            88:     return result;
        !            89: }

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