/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" /* On exit: errno = 0 only if there was non-empty, '\0' terminated value * errno = EINVAL if value was not '\0' terminated, but otherwise ok * Return value is still valid, caller should just check whether end[0] * is a valid terminating char for particular case. OTOH, if caller * requires '\0' terminated input, [s]he can just check errno == 0. * errno = ERANGE if value had alphanumeric terminating char ("1234abcg"). * errno = ERANGE if value is out of range, missing, etc. * errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok ) * return value is all-ones in this case. * * Test code: * char *endptr; * const char *minus = "-"; * errno = 0; * bb_strtoi(minus, &endptr, 0); // must set ERANGE * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL); * errno = 0; * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-' * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL); */ static unsigned long long ret_ERANGE(void) { errno = ERANGE; /* this ain't as small as it looks (on glibc) */ return ULLONG_MAX; } static unsigned long long handle_errors(unsigned long long v, char **endp) { char next_ch = **endp; /* errno is already set to ERANGE by strtoXXX if value overflowed */ if (next_ch) { /* "1234abcg" or out-of-range? */ if (isalnum(next_ch) || errno) return ret_ERANGE(); /* good number, just suspicious terminator */ errno = EINVAL; } return v; } unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base) { unsigned long long v; char *endptr; if (!endp) endp = &endptr; *endp = (char*) arg; /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */ /* I don't think that this is right. Preventing this... */ if (!isalnum(arg[0])) return ret_ERANGE(); /* not 100% correct for lib func, but convenient for the caller */ errno = 0; v = strtoull(arg, endp, base); return handle_errors(v, endp); } long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base) { unsigned long long v; char *endptr; char first; if (!endp) endp = &endptr; *endp = (char*) arg; /* Check for the weird "feature": * a "-" string is apparently a valid "number" for strto[u]l[l]! * It returns zero and errno is 0! :( */ first = (arg[0] != '-' ? arg[0] : arg[1]); if (!isalnum(first)) return ret_ERANGE(); errno = 0; v = strtoll(arg, endp, base); return handle_errors(v, endp); } #if ULONG_MAX != ULLONG_MAX unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base) { unsigned long v; char *endptr; if (!endp) endp = &endptr; *endp = (char*) arg; if (!isalnum(arg[0])) return ret_ERANGE(); errno = 0; v = strtoul(arg, endp, base); return handle_errors(v, endp); } long FAST_FUNC bb_strtol(const char *arg, char **endp, int base) { long v; char *endptr; char first; if (!endp) endp = &endptr; *endp = (char*) arg; first = (arg[0] != '-' ? arg[0] : arg[1]); if (!isalnum(first)) return ret_ERANGE(); errno = 0; v = strtol(arg, endp, base); return handle_errors(v, endp); } #endif #if UINT_MAX != ULONG_MAX unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base) { unsigned long v; char *endptr; if (!endp) endp = &endptr; *endp = (char*) arg; if (!isalnum(arg[0])) return ret_ERANGE(); errno = 0; v = strtoul(arg, endp, base); if (v > UINT_MAX) return ret_ERANGE(); return handle_errors(v, endp); } int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base) { long v; char *endptr; char first; if (!endp) endp = &endptr; *endp = (char*) arg; first = (arg[0] != '-' ? arg[0] : arg[1]); if (!isalnum(first)) return ret_ERANGE(); errno = 0; v = strtol(arg, endp, base); if (v > INT_MAX) return ret_ERANGE(); if (v < INT_MIN) return ret_ERANGE(); return handle_errors(v, endp); } #endif