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- /* 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
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