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 tarball for details.
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, char *endptr)
41 if (endp) *endp = endptr;
43 /* errno is already set to ERANGE by strtoXXX if value overflowed */
45 /* "1234abcg" or out-of-range? */
46 if (isalnum(endptr[0]) || errno)
48 /* good number, just suspicious terminator */
55 unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
60 /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
61 /* I don't think that this is right. Preventing this... */
62 if (!isalnum(arg[0])) return ret_ERANGE();
64 /* not 100% correct for lib func, but convenient for the caller */
66 v = strtoull(arg, &endptr, base);
67 return handle_errors(v, endp, endptr);
70 long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
75 /* Check for the weird "feature":
76 * a "-" string is apparently a valid "number" for strto[u]l[l]!
77 * It returns zero and errno is 0! :( */
78 char first = (arg[0] != '-' ? arg[0] : arg[1]);
79 if (!isalnum(first)) return ret_ERANGE();
82 v = strtoll(arg, &endptr, base);
83 return handle_errors(v, endp, endptr);
86 #if ULONG_MAX != ULLONG_MAX
87 unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
92 if (!isalnum(arg[0])) return ret_ERANGE();
94 v = strtoul(arg, &endptr, base);
95 return handle_errors(v, endp, endptr);
98 long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
103 char first = (arg[0] != '-' ? arg[0] : arg[1]);
104 if (!isalnum(first)) return ret_ERANGE();
107 v = strtol(arg, &endptr, base);
108 return handle_errors(v, endp, endptr);
112 #if UINT_MAX != ULONG_MAX
113 unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
118 if (!isalnum(arg[0])) return ret_ERANGE();
120 v = strtoul(arg, &endptr, base);
121 if (v > UINT_MAX) return ret_ERANGE();
122 return handle_errors(v, endp, endptr);
125 int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
130 char first = (arg[0] != '-' ? arg[0] : arg[1]);
131 if (!isalnum(first)) return ret_ERANGE();
134 v = strtol(arg, &endptr, base);
135 if (v > INT_MAX) return ret_ERANGE();
136 if (v < INT_MIN) return ret_ERANGE();
137 return handle_errors(v, endp, endptr);