1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 /* On exit: errno = 0 only if there was non-empty, '\0' terminated value
13 * errno = EINVAL if value was not '\0' terminated, but otherwise 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 * return value is all-ones in this case.
24 * const char *minus = "-";
26 * bb_strtoi(minus, &endptr, 0); // must set ERANGE
27 * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL);
29 * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-'
30 * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL);
33 static unsigned long long ret_ERANGE(void)
35 errno = ERANGE; /* this ain't as small as it looks (on glibc) */
39 static unsigned long long handle_errors(unsigned long long v, char **endp)
41 char next_ch = **endp;
43 /* errno is already set to ERANGE by strtoXXX if value overflowed */
45 /* "1234abcg" or out-of-range? */
46 if (isalnum(next_ch) || errno)
48 /* good number, just suspicious terminator */
55 unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
60 if (!endp) endp = &endptr;
63 /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
64 /* I don't think that this is right. Preventing this... */
65 if (!isalnum(arg[0])) return ret_ERANGE();
67 /* not 100% correct for lib func, but convenient for the caller */
69 v = strtoull(arg, endp, base);
70 return handle_errors(v, endp);
73 long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
79 if (!endp) endp = &endptr;
82 /* Check for the weird "feature":
83 * a "-" string is apparently a valid "number" for strto[u]l[l]!
84 * It returns zero and errno is 0! :( */
85 first = (arg[0] != '-' ? arg[0] : arg[1]);
86 if (!isalnum(first)) return ret_ERANGE();
89 v = strtoll(arg, endp, base);
90 return handle_errors(v, endp);
93 #if ULONG_MAX != ULLONG_MAX
94 unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
99 if (!endp) endp = &endptr;
102 if (!isalnum(arg[0])) return ret_ERANGE();
104 v = strtoul(arg, endp, base);
105 return handle_errors(v, endp);
108 long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
114 if (!endp) endp = &endptr;
117 first = (arg[0] != '-' ? arg[0] : arg[1]);
118 if (!isalnum(first)) return ret_ERANGE();
121 v = strtol(arg, endp, base);
122 return handle_errors(v, endp);
126 #if UINT_MAX != ULONG_MAX
127 unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
132 if (!endp) endp = &endptr;
135 if (!isalnum(arg[0])) return ret_ERANGE();
137 v = strtoul(arg, endp, base);
138 if (v > UINT_MAX) return ret_ERANGE();
139 return handle_errors(v, endp);
142 int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
148 if (!endp) endp = &endptr;
151 first = (arg[0] != '-' ? arg[0] : arg[1]);
152 if (!isalnum(first)) return ret_ERANGE();
155 v = strtol(arg, endp, base);
156 if (v > INT_MAX) return ret_ERANGE();
157 if (v < INT_MIN) return ret_ERANGE();
158 return handle_errors(v, endp);