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 source tree.
8  */
9 #include "libbb.h"
10 #include <math.h>  /* just for HUGE_VAL */
11 
12 #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
13 
14 #if 0 // UNUSED
15 double FAST_FUNC bb_strtod(const char *arg, char **endp)
16 {
17 	double v;
18 	char *endptr;
19 
20 	/* Allow .NN form. People want to use "sleep .15" etc */
21 	if (arg[0] != '-' && arg[0] != '.' && NOT_DIGIT(arg[0]))
22 		goto err;
23 	errno = 0;
24 	v = strtod(arg, &endptr);
25 	if (endp)
26 		*endp = endptr;
27 	if (endptr[0]) {
28 		/* "1234abcg" or out-of-range? */
29 		if (isalnum(endptr[0]) || errno) {
30  err:
31 			errno = ERANGE;
32 			return HUGE_VAL;
33 		}
34 		/* good number, just suspicious terminator */
35 		errno = EINVAL;
36 	}
37 	return v;
38 }
39 #endif
40 
41 #if 0
42 /* String to timespec: "NNNN[.NNNNN]" -> struct timespec.
43  * Can be used for other fixed-point needs.
44  * Returns pointer past last converted char,
45  * and returns errno similar to bb_strtoXX functions.
46  */
47 char* FAST_FUNC bb_str_to_ts(struct timespec *ts, const char *arg)
48 {
49 	if (sizeof(ts->tv_sec) <= sizeof(int))
50 		ts->tv_sec = bb_strtou(arg, &arg, 10);
51 	else if (sizeof(ts->tv_sec) <= sizeof(long))
52 		ts->tv_sec = bb_strtoul(arg, &arg, 10);
53 	else
54 		ts->tv_sec = bb_strtoull(arg, &arg, 10);
55 	ts->tv_nsec = 0;
56 
57 	if (*arg != '.')
58 		return arg;
59 
60 	/* !EINVAL: number is not ok (alphanumeric ending, overflow etc) */
61 	if (errno != EINVAL)
62 		return arg;
63 
64 	if (!*++arg) /* "NNN." */
65 		return arg;
66 
67 	{ /* "NNN.xxx" - parse xxx */
68 		int ndigits;
69 		char *p;
70 		char buf[10]; /* we never use more than 9 digits */
71 
72 		/* Need to make a copy to avoid false overflow */
73 		safe_strncpy(buf, arg, 10);
74 		ts->tv_nsec = bb_strtou(buf, &p, 10);
75 		ndigits = p - buf;
76 		arg += ndigits;
77 		/* normalize to nsec */
78 		while (ndigits < 9) {
79 			ndigits++;
80 			ts->tv_nsec *= 10;
81 		}
82 		while (isdigit(*arg)) /* skip possible 10th plus digits */
83 			arg++;
84 	}
85 	return arg;
86 }
87 #endif
88