[3320] | 1 | /*
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| 2 | *
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| 3 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 4 | */
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| 5 | /*
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| 6 | You need to define the following (example):
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| 7 |
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| 8 | #define type long
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| 9 | #define xstrtou(rest) xstrtoul##rest
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| 10 | #define xstrto(rest) xstrtol##rest
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| 11 | #define xatou(rest) xatoul##rest
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| 12 | #define xato(rest) xatol##rest
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| 13 | #define XSTR_UTYPE_MAX ULONG_MAX
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| 14 | #define XSTR_TYPE_MAX LONG_MAX
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| 15 | #define XSTR_TYPE_MIN LONG_MIN
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| 16 | #define XSTR_STRTOU strtoul
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| 17 | */
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| 18 |
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| 19 | unsigned type FAST_FUNC xstrtou(_range_sfx)(const char *numstr, int base,
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| 20 | unsigned type lower,
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| 21 | unsigned type upper,
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| 22 | const struct suffix_mult *suffixes)
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| 23 | {
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| 24 | unsigned type r;
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| 25 | int old_errno;
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| 26 | char *e;
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| 27 |
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| 28 | /* Disallow '-' and any leading whitespace. */
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| 29 | if (*numstr == '-' || *numstr == '+' || isspace(*numstr))
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| 30 | goto inval;
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| 31 |
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| 32 | /* Since this is a lib function, we're not allowed to reset errno to 0.
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| 33 | * Doing so could break an app that is deferring checking of errno.
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| 34 | * So, save the old value so that we can restore it if successful. */
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| 35 | old_errno = errno;
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| 36 | errno = 0;
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| 37 | r = XSTR_STRTOU(numstr, &e, base);
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| 38 | /* Do the initial validity check. Note: The standards do not
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| 39 | * guarantee that errno is set if no digits were found. So we
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| 40 | * must test for this explicitly. */
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| 41 | if (errno || numstr == e)
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| 42 | goto inval; /* error / no digits / illegal trailing chars */
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| 43 |
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| 44 | errno = old_errno; /* Ok. So restore errno. */
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| 45 |
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| 46 | /* Do optional suffix parsing. Allow 'empty' suffix tables.
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| 47 | * Note that we also allow nul suffixes with associated multipliers,
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| 48 | * to allow for scaling of the numstr by some default multiplier. */
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| 49 | if (suffixes) {
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| 50 | while (suffixes->mult) {
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| 51 | if (strcmp(suffixes->suffix, e) == 0) {
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| 52 | if (XSTR_UTYPE_MAX / suffixes->mult < r)
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| 53 | goto range; /* overflow! */
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| 54 | r *= suffixes->mult;
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| 55 | goto chk_range;
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| 56 | }
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| 57 | ++suffixes;
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | /* Note: trailing space is an error.
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| 62 | It would be easy enough to allow though if desired. */
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| 63 | if (*e)
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| 64 | goto inval;
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| 65 | chk_range:
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| 66 | /* Finally, check for range limits. */
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| 67 | if (r >= lower && r <= upper)
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| 68 | return r;
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| 69 | range:
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| 70 | bb_error_msg_and_die("number %s is not in %llu..%llu range",
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| 71 | numstr, (unsigned long long)lower,
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| 72 | (unsigned long long)upper);
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| 73 | inval:
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| 74 | bb_error_msg_and_die("invalid number '%s'", numstr);
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| 75 | }
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| 76 |
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| 77 | unsigned type FAST_FUNC xstrtou(_range)(const char *numstr, int base,
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| 78 | unsigned type lower,
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| 79 | unsigned type upper)
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| 80 | {
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| 81 | return xstrtou(_range_sfx)(numstr, base, lower, upper, NULL);
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| 82 | }
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| 83 |
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| 84 | unsigned type FAST_FUNC xstrtou(_sfx)(const char *numstr, int base,
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| 85 | const struct suffix_mult *suffixes)
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| 86 | {
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| 87 | return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, suffixes);
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| 88 | }
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| 89 |
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| 90 | unsigned type FAST_FUNC xstrtou()(const char *numstr, int base)
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| 91 | {
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| 92 | return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, NULL);
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| 93 | }
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| 94 |
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| 95 | unsigned type FAST_FUNC xatou(_range_sfx)(const char *numstr,
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| 96 | unsigned type lower,
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| 97 | unsigned type upper,
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| 98 | const struct suffix_mult *suffixes)
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| 99 | {
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| 100 | return xstrtou(_range_sfx)(numstr, 10, lower, upper, suffixes);
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| 101 | }
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| 102 |
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| 103 | unsigned type FAST_FUNC xatou(_range)(const char *numstr,
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| 104 | unsigned type lower,
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| 105 | unsigned type upper)
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| 106 | {
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| 107 | return xstrtou(_range_sfx)(numstr, 10, lower, upper, NULL);
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| 108 | }
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| 109 |
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| 110 | unsigned type FAST_FUNC xatou(_sfx)(const char *numstr,
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| 111 | const struct suffix_mult *suffixes)
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| 112 | {
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| 113 | return xstrtou(_range_sfx)(numstr, 10, 0, XSTR_UTYPE_MAX, suffixes);
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| 114 | }
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| 115 |
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| 116 | unsigned type FAST_FUNC xatou()(const char *numstr)
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| 117 | {
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| 118 | return xatou(_sfx)(numstr, NULL);
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| 119 | }
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| 120 |
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| 121 | /* Signed ones */
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| 122 |
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| 123 | type FAST_FUNC xstrto(_range_sfx)(const char *numstr, int base,
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| 124 | type lower,
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| 125 | type upper,
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| 126 | const struct suffix_mult *suffixes)
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| 127 | {
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| 128 | unsigned type u = XSTR_TYPE_MAX;
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| 129 | type r;
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| 130 | const char *p = numstr;
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| 131 |
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| 132 | /* NB: if you'll decide to disallow '+':
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| 133 | * at least renice applet needs to allow it */
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| 134 | if (p[0] == '+' || p[0] == '-') {
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| 135 | ++p;
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| 136 | if (p[0] == '-')
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| 137 | ++u; /* = <type>_MIN (01111... + 1 == 10000...) */
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| 138 | }
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| 139 |
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| 140 | r = xstrtou(_range_sfx)(p, base, 0, u, suffixes);
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| 141 |
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| 142 | if (*numstr == '-') {
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| 143 | r = -r;
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| 144 | }
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| 145 |
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| 146 | if (r < lower || r > upper) {
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| 147 | bb_error_msg_and_die("number %s is not in %lld..%lld range",
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| 148 | numstr, (long long)lower, (long long)upper);
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| 149 | }
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| 150 |
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| 151 | return r;
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| 152 | }
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| 153 |
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| 154 | type FAST_FUNC xstrto(_range)(const char *numstr, int base, type lower, type upper)
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| 155 | {
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| 156 | return xstrto(_range_sfx)(numstr, base, lower, upper, NULL);
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| 157 | }
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| 158 |
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| 159 | type FAST_FUNC xstrto()(const char *numstr, int base)
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| 160 | {
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| 161 | return xstrto(_range_sfx)(numstr, base, XSTR_TYPE_MIN, XSTR_TYPE_MAX, NULL);
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| 162 | }
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| 163 |
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| 164 | type FAST_FUNC xato(_range_sfx)(const char *numstr,
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| 165 | type lower,
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| 166 | type upper,
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| 167 | const struct suffix_mult *suffixes)
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| 168 | {
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| 169 | return xstrto(_range_sfx)(numstr, 10, lower, upper, suffixes);
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| 170 | }
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| 171 |
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| 172 | type FAST_FUNC xato(_range)(const char *numstr, type lower, type upper)
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| 173 | {
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| 174 | return xstrto(_range_sfx)(numstr, 10, lower, upper, NULL);
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| 175 | }
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| 176 |
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| 177 | type FAST_FUNC xato(_sfx)(const char *numstr, const struct suffix_mult *suffixes)
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| 178 | {
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| 179 | return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, suffixes);
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| 180 | }
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| 181 |
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| 182 | type FAST_FUNC xato()(const char *numstr)
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| 183 | {
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| 184 | return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, NULL);
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| 185 | }
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| 186 |
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| 187 | #undef type
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| 188 | #undef xstrtou
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| 189 | #undef xstrto
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| 190 | #undef xatou
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| 191 | #undef xato
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| 192 | #undef XSTR_UTYPE_MAX
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| 193 | #undef XSTR_TYPE_MAX
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| 194 | #undef XSTR_TYPE_MIN
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| 195 | #undef XSTR_STRTOU
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