| /* 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 tarball for details. |
| */ |
| |
| #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 othervise 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. |
| */ |
| |
| 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 *endptr) |
| { |
| if (endp) *endp = endptr; |
| |
| /* Check for the weird "feature": |
| * a "-" string is apparently a valid "number" for strto[u]l[l]! |
| * It returns zero and errno is 0! :( */ |
| if (endptr[-1] == '-') |
| return ret_ERANGE(); |
| |
| /* errno is already set to ERANGE by strtoXXX if value overflowed */ |
| if (endptr[0]) { |
| /* "1234abcg" or out-of-range? */ |
| if (isalnum(endptr[0]) || errno) |
| return ret_ERANGE(); |
| /* good number, just suspicious terminator */ |
| errno = EINVAL; |
| } |
| return v; |
| } |
| |
| |
| unsigned long long bb_strtoull(const char *arg, char **endp, int base) |
| { |
| unsigned long long v; |
| char *endptr; |
| |
| /* 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, &endptr, base); |
| return handle_errors(v, endp, endptr); |
| } |
| |
| long long bb_strtoll(const char *arg, char **endp, int base) |
| { |
| unsigned long long v; |
| char *endptr; |
| |
| if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
| errno = 0; |
| v = strtoll(arg, &endptr, base); |
| return handle_errors(v, endp, endptr); |
| } |
| |
| #if ULONG_MAX != ULLONG_MAX |
| unsigned long bb_strtoul(const char *arg, char **endp, int base) |
| { |
| unsigned long v; |
| char *endptr; |
| |
| if (!isalnum(arg[0])) return ret_ERANGE(); |
| errno = 0; |
| v = strtoul(arg, &endptr, base); |
| return handle_errors(v, endp, endptr); |
| } |
| |
| long bb_strtol(const char *arg, char **endp, int base) |
| { |
| long v; |
| char *endptr; |
| |
| if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
| errno = 0; |
| v = strtol(arg, &endptr, base); |
| return handle_errors(v, endp, endptr); |
| } |
| #endif |
| |
| #if UINT_MAX != ULONG_MAX |
| unsigned bb_strtou(const char *arg, char **endp, int base) |
| { |
| unsigned long v; |
| char *endptr; |
| |
| if (!isalnum(arg[0])) return ret_ERANGE(); |
| errno = 0; |
| v = strtoul(arg, &endptr, base); |
| if (v > UINT_MAX) return ret_ERANGE(); |
| return handle_errors(v, endp, endptr); |
| } |
| |
| int bb_strtoi(const char *arg, char **endp, int base) |
| { |
| long v; |
| char *endptr; |
| |
| if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
| errno = 0; |
| v = strtol(arg, &endptr, base); |
| if (v > INT_MAX) return ret_ERANGE(); |
| if (v < INT_MIN) return ret_ERANGE(); |
| return handle_errors(v, endp, endptr); |
| } |
| #endif |
| |
| /* Floating point */ |
| |
| #if 0 |
| |
| #include <math.h> /* just for HUGE_VAL */ |
| #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9) |
| double bb_strtod(const char *arg, char **endp) |
| { |
| double v; |
| char *endptr; |
| |
| if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err; |
| errno = 0; |
| v = strtod(arg, &endptr); |
| if (endp) *endp = endptr; |
| if (endptr[0]) { |
| /* "1234abcg" or out-of-range? */ |
| if (isalnum(endptr[0]) || errno) { |
| err: |
| errno = ERANGE; |
| return HUGE_VAL; |
| } |
| /* good number, just suspicious terminator */ |
| errno = EINVAL; |
| } |
| return v; |
| } |
| |
| #endif |