| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 | #include <math.h> /* just for HUGE_VAL */
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| 12 |
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| 13 | #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
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| 14 |
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| 15 | #if 0 // UNUSED
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| 16 | double FAST_FUNC bb_strtod(const char *arg, char **endp)
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| 17 | {
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| 18 | double v;
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| 19 | char *endptr;
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| 20 |
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| 21 | /* Allow .NN form. People want to use "sleep .15" etc */
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| 22 | if (arg[0] != '-' && arg[0] != '.' && NOT_DIGIT(arg[0]))
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| 23 | goto err;
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| 24 | errno = 0;
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| 25 | v = strtod(arg, &endptr);
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| 26 | if (endp)
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| 27 | *endp = endptr;
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| 28 | if (endptr[0]) {
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| 29 | /* "1234abcg" or out-of-range? */
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| 30 | if (isalnum(endptr[0]) || errno) {
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| 31 | err:
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| 32 | errno = ERANGE;
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| 33 | return HUGE_VAL;
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| 34 | }
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| 35 | /* good number, just suspicious terminator */
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| 36 | errno = EINVAL;
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| 37 | }
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| 38 | return v;
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| 39 | }
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| 40 | #endif
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| 41 |
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| 42 | #if 0
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| 43 | /* String to timespec: "NNNN[.NNNNN]" -> struct timespec.
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| 44 | * Can be used for other fixed-point needs.
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| 45 | * Returns pointer past last converted char,
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| 46 | * and returns errno similar to bb_strtoXX functions.
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| 47 | */
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| 48 | char* FAST_FUNC bb_str_to_ts(struct timespec *ts, const char *arg)
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| 49 | {
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| 50 | if (sizeof(ts->tv_sec) <= sizeof(int))
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| 51 | ts->tv_sec = bb_strtou(arg, &arg, 10);
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| 52 | else if (sizeof(ts->tv_sec) <= sizeof(long))
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| 53 | ts->tv_sec = bb_strtoul(arg, &arg, 10);
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| 54 | else
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| 55 | ts->tv_sec = bb_strtoull(arg, &arg, 10);
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| 56 | ts->tv_nsec = 0;
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| 57 |
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| 58 | if (*arg != '.')
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| 59 | return arg;
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| 60 |
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| 61 | /* !EINVAL: number is not ok (alphanumeric ending, overflow etc) */
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| 62 | if (errno != EINVAL)
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| 63 | return arg;
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| 64 |
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| 65 | if (!*++arg) /* "NNN." */
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| 66 | return arg;
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| 67 |
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| 68 | { /* "NNN.xxx" - parse xxx */
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| 69 | int ndigits;
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| 70 | char *p;
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| 71 | char buf[10]; /* we never use more than 9 digits */
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| 72 |
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| 73 | /* Need to make a copy to avoid false overflow */
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| 74 | safe_strncpy(buf, arg, 10);
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| 75 | ts->tv_nsec = bb_strtou(buf, &p, 10);
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| 76 | ndigits = p - buf;
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| 77 | arg += ndigits;
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| 78 | /* normalize to nsec */
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| 79 | while (ndigits < 9) {
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| 80 | ndigits++;
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| 81 | ts->tv_nsec *= 10;
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| 82 | }
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| 83 | while (isdigit(*arg)) /* skip possible 10th plus digits */
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| 84 | arg++;
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| 85 | }
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| 86 | return arg;
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| 87 | }
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| 88 | #endif
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