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Annotation of micropolis/src/tcl/compat/strtol.c, revision 1.1.1.1

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/tcl/compat/RCS/strtol.c,v 1.1 91/09/22 15:42:49 ouster Exp $ SPRITE (Berkeley)";
                     18: #endif /* not lint */
                     19: 
                     20: #include <ctype.h>
                     21: 
                     22: 
                     23: /*
                     24:  *----------------------------------------------------------------------
                     25:  *
                     26:  * strtol --
                     27:  *
                     28:  *     Convert an ASCII string into an integer.
                     29:  *
                     30:  * Results:
                     31:  *     The return value is the integer equivalent of string.  If endPtr
                     32:  *     is non-NULL, then *endPtr is filled in with the character
                     33:  *     after the last one that was part of the integer.  If string
                     34:  *     doesn't contain a valid integer value, then zero is returned
                     35:  *     and *endPtr is set to string.
                     36:  *
                     37:  * Side effects:
                     38:  *     None.
                     39:  *
                     40:  *----------------------------------------------------------------------
                     41:  */
                     42: 
                     43: long int
                     44: strtol(string, endPtr, base)
                     45:     char *string;              /* String of ASCII digits, possibly
                     46:                                 * preceded by white space.  For bases
                     47:                                 * greater than 10, either lower- or
                     48:                                 * upper-case digits may be used.
                     49:                                 */
                     50:     char **endPtr;             /* Where to store address of terminating
                     51:                                 * character, or NULL. */
                     52:     int base;                  /* Base for conversion.  Must be less
                     53:                                 * than 37.  If 0, then the base is chosen
                     54:                                 * from the leading characters of string:
                     55:                                 * "0x" means hex, "0" means octal, anything
                     56:                                 * else means decimal.
                     57:                                 */
                     58: {
                     59:     register char *p;
                     60:     int result;
                     61: 
                     62:     /*
                     63:      * Skip any leading blanks.
                     64:      */
                     65: 
                     66:     p = string;
                     67:     while (isspace(*p)) {
                     68:        p += 1;
                     69:     }
                     70: 
                     71:     /*
                     72:      * Check for a sign.
                     73:      */
                     74: 
                     75:     if (*p == '-') {
                     76:        p += 1;
                     77:        result = -(strtoul(p, endPtr, base));
                     78:     } else {
                     79:        if (*p == '+') {
                     80:            p += 1;
                     81:        }
                     82:        result = strtoul(p, endPtr, base);
                     83:     }
                     84:     if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
                     85:        *endPtr = string;
                     86:     }
                     87:     return result;
                     88: }

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