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libbb/bb_strtonum: always set end ptr, even on error return

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function                                             old     new   delta
handle_errors                                         69      61      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-12-22 13:00:32 +01:00
parent 6a93212b54
commit ba65872950
1 changed files with 40 additions and 19 deletions
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59
libbb/bb_strtonum.c
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@ -36,14 +36,14 @@ static unsigned long long ret_ERANGE(void)
return ULLONG_MAX;
}
static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
static unsigned long long handle_errors(unsigned long long v, char **endp)
{
if (endp) *endp = endptr;
char next_ch = **endp;
/* errno is already set to ERANGE by strtoXXX if value overflowed */
if (endptr[0]) {
if (next_ch) {
/* "1234abcg" or out-of-range? */
if (isalnum(endptr[0]) || errno)
if (isalnum(next_ch) || errno)
return ret_ERANGE();
/* good number, just suspicious terminator */
errno = EINVAL;
@ -57,30 +57,37 @@ 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, &endptr, base);
return handle_errors(v, endp, endptr);
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! :( */
char first = (arg[0] != '-' ? arg[0] : arg[1]);
first = (arg[0] != '-' ? arg[0] : arg[1]);
if (!isalnum(first)) return ret_ERANGE();
errno = 0;
v = strtoll(arg, &endptr, base);
return handle_errors(v, endp, endptr);
v = strtoll(arg, endp, base);
return handle_errors(v, endp);
}
#if ULONG_MAX != ULLONG_MAX
@ -89,23 +96,30 @@ 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, &endptr, base);
return handle_errors(v, endp, endptr);
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;
char first = (arg[0] != '-' ? arg[0] : arg[1]);
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, &endptr, base);
return handle_errors(v, endp, endptr);
v = strtol(arg, endp, base);
return handle_errors(v, endp);
}
#endif
@ -115,25 +129,32 @@ 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, &endptr, base);
v = strtoul(arg, endp, base);
if (v > UINT_MAX) return ret_ERANGE();
return handle_errors(v, endp, endptr);
return handle_errors(v, endp);
}
int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
{
long v;
char *endptr;
char first;
char first = (arg[0] != '-' ? arg[0] : arg[1]);
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, &endptr, base);
v = strtol(arg, endp, base);
if (v > INT_MAX) return ret_ERANGE();
if (v < INT_MIN) return ret_ERANGE();
return handle_errors(v, endp, endptr);
return handle_errors(v, endp);
}
#endif