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authorDenis Vlasenko <vda.linux@googlemail.com>2006-11-27 15:12:16 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2006-11-27 15:12:16 +0000
commit3ece72dc3f95d195924c760f9ee5059e35908564 (patch)
tree89ab0d32e2758a2c233076c25421a852834a997e /libbb/bb_strtonum.c
parent459903bd4e270ab4884ba9577516f9b2753898b0 (diff)
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svn add bb_strtonum.c :(
Diffstat (limited to 'libbb/bb_strtonum.c')
-rw-r--r--libbb/bb_strtonum.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/libbb/bb_strtonum.c b/libbb/bb_strtonum.c
new file mode 100644
index 000000000..7e28eeb86
--- /dev/null
+++ b/libbb/bb_strtonum.c
@@ -0,0 +1,147 @@
1/* 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 )
20 */
21
22static unsigned long long ret_ERANGE(void)
23{
24 errno = ERANGE; /* this ain't as small as it looks (on glibc) */
25 return ULLONG_MAX;
26}
27
28static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
29{
30 if (endp) *endp = endptr;
31
32 /* Check for the weird "feature":
33 * a "-" string is apparently a valid "number" for strto[u]l[l]!
34 * It returns zero and errno is 0! :( */
35 if (endptr[-1] == '-')
36 return ret_ERANGE();
37
38 /* errno is already set to ERANGE by strtoXXX if value overflowed */
39 if (endptr[0]) {
40 /* "1234abcg" or out-of-range? */
41 if (isalnum(endptr[0]) || errno)
42 return ret_ERANGE();
43 /* good number, just suspicious terminator */
44 errno = EINVAL;
45 }
46 return v;
47}
48
49
50unsigned long long bb_strtoull(const char *arg, char **endp, int base)
51{
52 char *endptr;
53
54 /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
55 /* I don't think that this is right. Preventing this... */
56 if (!isalnum(arg[0])) return ret_ERANGE();
57
58 /* not 100% correct for lib func, but convenient for the caller */
59 errno = 0;
60 return handle_errors(strtoull(arg, &endptr, base), endp, endptr);
61}
62
63long long bb_strtoll(const char *arg, char **endp, int base)
64{
65 char *endptr;
66
67 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
68 errno = 0;
69 return handle_errors(strtoll(arg, &endptr, base), endp, endptr);
70}
71
72#if ULONG_MAX != ULLONG_MAX
73unsigned long bb_strtoul(const char *arg, char **endp, int base)
74{
75 char *endptr;
76
77 if (!isalnum(arg[0])) return ret_ERANGE();
78 errno = 0;
79 return handle_errors(strtoul(arg, &endptr, base), endp, endptr);
80}
81
82long bb_strtol(const char *arg, char **endp, int base)
83{
84 char *endptr;
85
86 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
87 errno = 0;
88 return handle_errors(strtol(arg, &endptr, base), endp, endptr);
89}
90#endif
91
92#if UINT_MAX != ULONG_MAX
93unsigned bb_strtou(const char *arg, char **endp, int base)
94{
95 unsigned long v;
96 char *endptr;
97
98 if (!isalnum(arg[0])) return ret_ERANGE();
99 errno = 0;
100 v = strtoul(arg, &endptr, base);
101 if (v > UINT_MAX) return ret_ERANGE();
102 return handle_errors(v, endp, endptr);
103}
104
105int bb_strtoi(const char *arg, char **endp, int base)
106{
107 long v;
108 char *endptr;
109
110 if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
111 errno = 0;
112 v = strtol(arg, &endptr, base);
113 if (v > INT_MAX) return ret_ERANGE();
114 if (v < INT_MIN) return ret_ERANGE();
115 return handle_errors(v, endp, endptr);
116}
117#endif
118
119/* Floating point */
120
121#if 0
122
123#include <math.h> /* just for HUGE_VAL */
124#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
125double bb_strtod(const char *arg, char **endp)
126{
127 double v;
128 char *endptr;
129
130 if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err;
131 errno = 0;
132 v = strtod(arg, &endptr);
133 if (endp) *endp = endptr;
134 if (endptr[0]) {
135 /* "1234abcg" or out-of-range? */
136 if (isalnum(endptr[0]) || errno) {
137 err:
138 errno = ERANGE;
139 return HUGE_VAL;
140 }
141 /* good number, just suspicious terminator */
142 errno = EINVAL;
143 }
144 return v;
145}
146
147#endif
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