libukcprog/src/strtol.c

/* strtol.c - strtol, for machines that don't have it */

/*  Copyright 1991 Mark Russell, University of Kent at Canterbury. */

char ukcprog_strtol_sccsid[] = "$Id: strtol.c,v 1.4 1992/07/19 16:27:34 mtr Exp $ UKC";

#if defined(clipper) || (defined(vax) && !defined(ultrix))

#include <ctype.h>
#include <stdlib.h>

#define NO_STRTOL
#endif

#ifdef NO_STRTOL
long
strtol(nptr, eptr, base)
const char *nptr;
char **eptr;
int base;
{
        const char *s, *save_s;
        long val;

        for (s = nptr; *s != '\0' && isspace(*s); ++s)
                ;
        
        if (base > 36) {
                base = 10;
        }
        else if (base == 16) {
                if (*s == '0' && (s[1] == 'x' || s[1] == 'X'))
                        s += 2;
        }
        else if (base == 0) {
                if (*s == '0') {
                        ++s;
                        if (*s == 'x' || *s == 'X') {
                                ++s;
                                base = 16;
                        }
                        else if (isdigit(*s))
                                base = 8;
                        else {
                                --s;
                                base = 10;
                        }
                }
                else
                        base = 10;
        }

        val = 0;
        for (save_s = s; *s != '\0'; ++s) {
                int digit;

                if (isdigit(*s))
                        digit = *s - '0';
                else if (isupper(*s))
                        digit = *s - 'A' + 10;
                else if (islower(*s))
                        digit = *s - 'a' + 10;
                else
                        break;
                if (digit >= base)
                        break;
                
                val = val * base + digit;
        }
        if (s == save_s)
                s = nptr;

        if (eptr != NULL)
                *eptr = (char *)((s > save_s) ? s : nptr);
        
        return val;
}
#endif /* clipper || vax */
Revision:	1.1
Committed:	Sat Mar 29 16:30:33 2003 UTC (21 years, 9 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBUKCPROG_1_0_2, LIBUKCPROG_1_0_1, LIBUKCPROG_1_0, HEAD
Log Message:	libukcprog is now a seperate package. I doubt this will be much use to anyone other than us, but I see no reason why we can't package it up and distribute it. Obviously we can't attach the GPL to this, as we don't own it.
#	User	Rev	Content
1	tdb	1.1	/* strtol.c - strtol, for machines that don't have it */
2
3			/* Copyright 1991 Mark Russell, University of Kent at Canterbury. */
4
5			char ukcprog_strtol_sccsid[] = "$Id: strtol.c,v 1.4 1992/07/19 16:27:34 mtr Exp $ UKC";
6
7			#if defined(clipper) \|\| (defined(vax) && !defined(ultrix))
8
9			#include <ctype.h>
10			#include <stdlib.h>
11
12			#define NO_STRTOL
13			#endif
14
15			#ifdef NO_STRTOL
16			long
17			strtol(nptr, eptr, base)
18			const char *nptr;
19			char **eptr;
20			int base;
21			{
22			const char s, save_s;
23			long val;
24
25			for (s = nptr; s != '\0' && isspace(s); ++s)
26			;
27
28			if (base > 36) {
29			base = 10;
30			}
31			else if (base == 16) {
32			if (*s == '0' && (s[1] == 'x' \|\| s[1] == 'X'))
33			s += 2;
34			}
35			else if (base == 0) {
36			if (*s == '0') {
37			++s;
38			if (s == 'x' \|\| s == 'X') {
39			++s;
40			base = 16;
41			}
42			else if (isdigit(*s))
43			base = 8;
44			else {
45			--s;
46			base = 10;
47			}
48			}
49			else
50			base = 10;
51			}
52
53			val = 0;
54			for (save_s = s; *s != '\0'; ++s) {
55			int digit;
56
57			if (isdigit(*s))
58			digit = *s - '0';
59			else if (isupper(*s))
60			digit = *s - 'A' + 10;
61			else if (islower(*s))
62			digit = *s - 'a' + 10;
63			else
64			break;
65			if (digit >= base)
66			break;
67
68			val = val * base + digit;
69			}
70			if (s == save_s)
71			s = nptr;
72
73			if (eptr != NULL)
74			eptr = (char )((s > save_s) ? s : nptr);
75
76			return val;
77			}
78			#endif /* clipper \|\| vax */