modules/ut/numconv.c
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FUNCTIONS
This source file includes following functions.
- ut_dec_2_uns
1 /***************************************
2 $Revision: 1.5 $
3
4 Utilities (ut). numconv.c - library for fast numerical conversions
5 (to[?]/from string).
6
7 Status: NOT REVUED, TESTED,
8
9 Design and implementation by: Marek Bukowy
10
11 ******************/ /******************
12 Copyright (c) 1999,2000,2001 RIPE NCC
13
14 All Rights Reserved
15
16 Permission to use, copy, modify, and distribute this software and its
17 documentation for any purpose and without fee is hereby granted,
18 provided that the above copyright notice appear in all copies and that
19 both that copyright notice and this permission notice appear in
20 supporting documentation, and that the name of the author not be
21 used in advertising or publicity pertaining to distribution of the
22 software without specific, written prior permission.
23
24 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
25 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
26 AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
27 DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
28 AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
29 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
30 ***************************************/
31
32 #include "rip.h"
33 #include <ctype.h>
34
35 /* converts QUICKLY a string to integer value, stops when encounters a
36 whitespace. All it expects is an UNSIGNED INTEGER value,
37 so in case it gets a non-digit (and non-whitespace) character it returns -1
38
39 if everything looks fine, it return 0. The converted unsigned int is placed
40 into *result;
41 */
42
43 int
44 ut_dec_2_uns(char *cpy, unsigned *result)
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45 {
46 register unsigned val=0;
47 register char *ch=cpy;
48
49 while( *ch != '\0') {
50
51 if ( ! isdigit(* (unsigned char *) ch)) { /* make the &*^%#@$%^ */
52 if ( isspace(* (unsigned char *) ch)) { /* gcc happy */
53 break;
54 }
55 else {
56 return -1;
57 }
58 }
59
60 val *= 10;
61 val += ( *ch - '0' );
62 ch++;
63 }
64
65 *result = val;
66 return 0;
67 }