blob: 525c830cdfb606382ed2f49616448dc842b85b8d [file] [log] [blame]
Denis Vlasenko3ece72d2006-11-27 15:12:16 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "libbb.h"
11
12/* On exit: errno = 0 only if there was non-empty, '\0' terminated value
13 * errno = EINVAL if value was not '\0' terminated, but othervise ok
14 * Return value is still valid, caller should just check whether end[0]
15 * is a valid terminating char for particular case. OTOH, if caller
16 * requires '\0' terminated input, [s]he can just check errno == 0.
17 * errno = ERANGE if value had alphanumeric terminating char ("1234abcg").
18 * errno = ERANGE if value is out of range, missing, etc.
19 * errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok )
Denis Vlasenko666da5e2006-12-26 18:17:42 +000020 * return value is all-ones in this case.
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000021 */
22
23static unsigned long long ret_ERANGE(void)
24{
25 errno = ERANGE; /* this ain't as small as it looks (on glibc) */
26 return ULLONG_MAX;
27}
28
29static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
30{
31 if (endp) *endp = endptr;
32
33 /* Check for the weird "feature":
34 * a "-" string is apparently a valid "number" for strto[u]l[l]!
35 * It returns zero and errno is 0! :( */
36 if (endptr[-1] == '-')
37 return ret_ERANGE();
38
39 /* errno is already set to ERANGE by strtoXXX if value overflowed */
40 if (endptr[0]) {
41 /* "1234abcg" or out-of-range? */
42 if (isalnum(endptr[0]) || errno)
43 return ret_ERANGE();
44 /* good number, just suspicious terminator */
45 errno = EINVAL;
46 }
47 return v;
48}
49
50
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000051unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000052{
Denis Vlasenkodf381882006-11-28 10:54:16 +000053 unsigned long long v;
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000054 char *endptr;
55
56 /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
57 /* I don't think that this is right. Preventing this... */
58 if (!isalnum(arg[0])) return ret_ERANGE();
59
60 /* not 100% correct for lib func, but convenient for the caller */
61 errno = 0;
Denis Vlasenkodf381882006-11-28 10:54:16 +000062 v = strtoull(arg, &endptr, base);
63 return handle_errors(v, endp, endptr);
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000064}
65
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000066long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000067{
Denis Vlasenkodf381882006-11-28 10:54:16 +000068 unsigned long long v;
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000069 char *endptr;
70
71 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
72 errno = 0;
Denis Vlasenkodf381882006-11-28 10:54:16 +000073 v = strtoll(arg, &endptr, base);
74 return handle_errors(v, endp, endptr);
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000075}
76
77#if ULONG_MAX != ULLONG_MAX
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000078unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000079{
Denis Vlasenkodf381882006-11-28 10:54:16 +000080 unsigned long v;
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000081 char *endptr;
82
83 if (!isalnum(arg[0])) return ret_ERANGE();
84 errno = 0;
Denis Vlasenkodf381882006-11-28 10:54:16 +000085 v = strtoul(arg, &endptr, base);
86 return handle_errors(v, endp, endptr);
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000087}
88
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000089long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000090{
Denis Vlasenkodf381882006-11-28 10:54:16 +000091 long v;
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000092 char *endptr;
93
94 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
95 errno = 0;
Denis Vlasenkodf381882006-11-28 10:54:16 +000096 v = strtol(arg, &endptr, base);
97 return handle_errors(v, endp, endptr);
Denis Vlasenko3ece72d2006-11-27 15:12:16 +000098}
99#endif
100
101#if UINT_MAX != ULONG_MAX
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000102unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +0000103{
104 unsigned long v;
105 char *endptr;
106
107 if (!isalnum(arg[0])) return ret_ERANGE();
108 errno = 0;
109 v = strtoul(arg, &endptr, base);
110 if (v > UINT_MAX) return ret_ERANGE();
111 return handle_errors(v, endp, endptr);
112}
113
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000114int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +0000115{
116 long v;
117 char *endptr;
118
119 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
120 errno = 0;
121 v = strtol(arg, &endptr, base);
122 if (v > INT_MAX) return ret_ERANGE();
123 if (v < INT_MIN) return ret_ERANGE();
124 return handle_errors(v, endp, endptr);
125}
126#endif
127
128/* Floating point */
129
130#if 0
131
132#include <math.h> /* just for HUGE_VAL */
133#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000134double FAST_FUNC bb_strtod(const char *arg, char **endp)
Denis Vlasenko3ece72d2006-11-27 15:12:16 +0000135{
136 double v;
137 char *endptr;
138
139 if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err;
140 errno = 0;
141 v = strtod(arg, &endptr);
142 if (endp) *endp = endptr;
143 if (endptr[0]) {
144 /* "1234abcg" or out-of-range? */
145 if (isalnum(endptr[0]) || errno) {
146 err:
147 errno = ERANGE;
148 return HUGE_VAL;
149 }
150 /* good number, just suspicious terminator */
151 errno = EINVAL;
152 }
153 return v;
154}
155
156#endif