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