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, 1 month 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.
#	Content
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 */