3ece72dc3
Denis Vlasenko
2006-11-27
Subject
svn add bb_strtonum.c :(
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libbb/bb_strtonum.c+147 -0
| @@ -0,0 +1,147 @@ | |
| + | /* vi: set sw=4 ts=4: */ |
| + | /* |
| + | * Utility routines. |
| + | * |
| + | * Copyright (C) 1999-2004 by Erik Andersen <[email protected]> |
| + | * |
| + | * 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 ) |
| + | */ |
| + | |
| + | 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) |
| + | { |
| + | 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; |
| + | return handle_errors(strtoull(arg, &endptr, base), endp, endptr); |
| + | } |
| + | |
| + | long long bb_strtoll(const char *arg, char **endp, int base) |
| + | { |
| + | char *endptr; |
| + | |
| + | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
| + | errno = 0; |
| + | return handle_errors(strtoll(arg, &endptr, base), endp, endptr); |
| + | } |
| + | |
| + | #if ULONG_MAX != ULLONG_MAX |
| + | unsigned long bb_strtoul(const char *arg, char **endp, int base) |
| + | { |
| + | char *endptr; |
| + | |
| + | if (!isalnum(arg[0])) return ret_ERANGE(); |
| + | errno = 0; |
| + | return handle_errors(strtoul(arg, &endptr, base), endp, endptr); |
| + | } |
| + | |
| + | long bb_strtol(const char *arg, char **endp, int base) |
| + | { |
| + | char *endptr; |
| + | |
| + | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
| + | errno = 0; |
| + | return handle_errors(strtol(arg, &endptr, base), 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 |