diff options
Diffstat (limited to 'release/src/router/busybox/libbb/xatonum_template.c')
| -rw-r--r-- | release/src/router/busybox/libbb/xatonum_template.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/release/src/router/busybox/libbb/xatonum_template.c b/release/src/router/busybox/libbb/xatonum_template.c new file mode 100644 index 00000000..5e0bb59e --- /dev/null +++ b/release/src/router/busybox/libbb/xatonum_template.c @@ -0,0 +1,191 @@ +/* + * + * Licensed under GPLv2, see file LICENSE in this tarball for details. + */ +/* +You need to define the following (example): + +#define type long +#define xstrtou(rest) xstrtoul##rest +#define xstrto(rest) xstrtol##rest +#define xatou(rest) xatoul##rest +#define xato(rest) xatol##rest +#define XSTR_UTYPE_MAX ULONG_MAX +#define XSTR_TYPE_MAX LONG_MAX +#define XSTR_TYPE_MIN LONG_MIN +#define XSTR_STRTOU strtoul +*/ + +unsigned type FAST_FUNC xstrtou(_range_sfx)(const char *numstr, int base, + unsigned type lower, + unsigned type upper, + const struct suffix_mult *suffixes) +{ + unsigned type r; + int old_errno; + char *e; + + /* Disallow '-' and any leading whitespace. Make sure we get the + * actual isspace function rather than a macro implementaion. */ + if (*numstr == '-' || *numstr == '+' || (isspace)(*numstr)) + goto inval; + + /* Since this is a lib function, we're not allowed to reset errno to 0. + * Doing so could break an app that is deferring checking of errno. + * So, save the old value so that we can restore it if successful. */ + old_errno = errno; + errno = 0; + r = XSTR_STRTOU(numstr, &e, base); + /* Do the initial validity check. Note: The standards do not + * guarantee that errno is set if no digits were found. So we + * must test for this explicitly. */ + if (errno || numstr == e) + goto inval; /* error / no digits / illegal trailing chars */ + + errno = old_errno; /* Ok. So restore errno. */ + + /* Do optional suffix parsing. Allow 'empty' suffix tables. + * Note that we also allow nul suffixes with associated multipliers, + * to allow for scaling of the numstr by some default multiplier. */ + if (suffixes) { + while (suffixes->mult) { + if (strcmp(suffixes->suffix, e) == 0) { + if (XSTR_UTYPE_MAX / suffixes->mult < r) + goto range; /* overflow! */ + r *= suffixes->mult; + goto chk_range; + } + ++suffixes; + } + } + + /* Note: trailing space is an error. + It would be easy enough to allow though if desired. */ + if (*e) + goto inval; + chk_range: + /* Finally, check for range limits. */ + if (r >= lower && r <= upper) + return r; + range: + bb_error_msg_and_die("number %s is not in %llu..%llu range", + numstr, (unsigned long long)lower, + (unsigned long long)upper); + inval: + bb_error_msg_and_die("invalid number '%s'", numstr); +} + +unsigned type FAST_FUNC xstrtou(_range)(const char *numstr, int base, + unsigned type lower, + unsigned type upper) +{ + return xstrtou(_range_sfx)(numstr, base, lower, upper, NULL); +} + +unsigned type FAST_FUNC xstrtou(_sfx)(const char *numstr, int base, + const struct suffix_mult *suffixes) +{ + return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, suffixes); +} + +unsigned type FAST_FUNC xstrtou()(const char *numstr, int base) +{ + return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, NULL); +} + +unsigned type FAST_FUNC xatou(_range_sfx)(const char *numstr, + unsigned type lower, + unsigned type upper, + const struct suffix_mult *suffixes) +{ + return xstrtou(_range_sfx)(numstr, 10, lower, upper, suffixes); +} + +unsigned type FAST_FUNC xatou(_range)(const char *numstr, + unsigned type lower, + unsigned type upper) +{ + return xstrtou(_range_sfx)(numstr, 10, lower, upper, NULL); +} + +unsigned type FAST_FUNC xatou(_sfx)(const char *numstr, + const struct suffix_mult *suffixes) +{ + return xstrtou(_range_sfx)(numstr, 10, 0, XSTR_UTYPE_MAX, suffixes); +} + +unsigned type FAST_FUNC xatou()(const char *numstr) +{ + return xatou(_sfx)(numstr, NULL); +} + +/* Signed ones */ + +type FAST_FUNC xstrto(_range_sfx)(const char *numstr, int base, + type lower, + type upper, + const struct suffix_mult *suffixes) +{ + unsigned type u = XSTR_TYPE_MAX; + type r; + const char *p = numstr; + + /* NB: if you'll decide to disallow '+': + * at least renice applet needs to allow it */ + if (p[0] == '+' || p[0] == '-') { + ++p; + if (p[0] == '-') + ++u; /* = <type>_MIN (01111... + 1 == 10000...) */ + } + + r = xstrtou(_range_sfx)(p, base, 0, u, suffixes); + + if (*numstr == '-') { + r = -r; + } + + if (r < lower || r > upper) { + bb_error_msg_and_die("number %s is not in %lld..%lld range", + numstr, (long long)lower, (long long)upper); + } + + return r; +} + +type FAST_FUNC xstrto(_range)(const char *numstr, int base, type lower, type upper) +{ + return xstrto(_range_sfx)(numstr, base, lower, upper, NULL); +} + +type FAST_FUNC xato(_range_sfx)(const char *numstr, + type lower, + type upper, + const struct suffix_mult *suffixes) +{ + return xstrto(_range_sfx)(numstr, 10, lower, upper, suffixes); +} + +type FAST_FUNC xato(_range)(const char *numstr, type lower, type upper) +{ + return xstrto(_range_sfx)(numstr, 10, lower, upper, NULL); +} + +type FAST_FUNC xato(_sfx)(const char *numstr, const struct suffix_mult *suffixes) +{ + return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, suffixes); +} + +type FAST_FUNC xato()(const char *numstr) +{ + return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, NULL); +} + +#undef type +#undef xstrtou +#undef xstrto +#undef xatou +#undef xato +#undef XSTR_UTYPE_MAX +#undef XSTR_TYPE_MAX +#undef XSTR_TYPE_MIN +#undef XSTR_STRTOU |