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Lib: Support for 64-bit numbers in bvsnprintf()

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Use 'l' for s64/u64 instead of for long/ulong, as that is much more
useful. Also make number() correct with regard to signed/unsigned
typecasts.
This commit is contained in:
Ondrej Zajicek (work) 2019-10-01 17:01:29 +02:00
parent cc95b4594a
commit 759b204be3
4 changed files with 50 additions and 35 deletions
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55
lib/printf.c
View File

@ -34,13 +34,7 @@ static int skip_atoi(const char **s)
#define SPECIAL 32 /* 0x */
#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
#define do_div(n,base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
__res; })
static char * number(char * str, long num, int base, int size, int precision,
static char * number(char * str, u64 num, uint base, int size, int precision,
int type, int remains)
{
char c,sign,tmp[66];
@ -58,7 +52,7 @@ static char * number(char * str, long num, int base, int size, int precision,
c = (type & ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & SIGN) {
if (num < 0) {
if (num > (u64) INT64_MAX) {
sign = '-';
num = -num;
size--;
@ -79,8 +73,11 @@ static char * number(char * str, long num, int base, int size, int precision,
i = 0;
if (num == 0)
tmp[i++]='0';
else while (num != 0)
tmp[i++] = digits[do_div(num,base)];
else while (num != 0) {
uint res = num % base;
num = num / base;
tmp[i++] = digits[res];
}
if (i > precision)
precision = i;
size -= precision;
@ -128,16 +125,17 @@ static char * number(char * str, long num, int base, int size, int precision,
* value printed as eight :-separated octets), |%t| for time values (btime) with
* specified subsecond precision, and |%m| resp. |%M| for error messages (uses
* strerror() to translate @errno code to message text). On the other hand, it
* doesn't support floating point numbers.
* doesn't support floating point numbers. The bvsnprintf() supports |%h| and
* |%l| qualifiers, but |%l| is used for s64/u64 instead of long/ulong.
*
* Result: number of characters of the output string or -1 if
* the buffer space was insufficient.
*/
int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
{
int len;
unsigned long num;
int i, base;
int len, i;
u64 num;
uint base;
u32 x;
u64 X;
btime t;
@ -152,7 +150,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
int field_width; /* width of output field */
int precision; /* min. # of digits for integers; max
number of chars for from string */
int qualifier; /* 'h', 'l', or 'L' for integer fields */
int qualifier; /* 'h' or 'l' for integer fields */
for (start=str=buf ; *fmt ; ++fmt, size-=(str-start), start=str) {
if (*fmt != '%') {
@ -286,8 +284,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
field_width = 2*sizeof(void *);
flags |= ZEROPAD;
}
str = number(str,
(unsigned long) va_arg(args, void *), 16,
str = number(str, (uintptr_t) va_arg(args, void *), 16,
field_width, precision, flags, size);
if (!str)
return -1;
@ -295,7 +292,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
case 'n':
if (qualifier == 'l') {
long * ip = va_arg(args, long *);
s64 * ip = va_arg(args, s64 *);
*ip = (str - buf);
} else {
int * ip = va_arg(args, int *);
@ -393,7 +390,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
/* Print seconds */
flags |= SIGN;
str = number(str, t1, 10, field_width, 0, flags, size);
str = number(str, (u64) t1, 10, field_width, 0, flags, size);
if (!str)
return -1;
@ -411,7 +408,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
/* Print sub-seconds */
*str++ = '.';
str = number(str, t2, 10, precision, 0, ZEROPAD, size - 1);
str = number(str, (u64) t2, 10, precision, 0, ZEROPAD, size - 1);
if (!str)
return -1;
}
@ -446,16 +443,22 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
--fmt;
continue;
}
if (flags & SIGN) {
/* Conversions valid per ISO C99 6.3.1.3 (2) */
if (qualifier == 'l')
num = va_arg(args, unsigned long);
else if (qualifier == 'h') {
num = (u64) va_arg(args, s64);
else if (qualifier == 'h')
num = (u64) (short) va_arg(args, int);
else
num = (u64) va_arg(args, int);
} else {
if (qualifier == 'l')
num = va_arg(args, u64);
else if (qualifier == 'h')
num = (unsigned short) va_arg(args, int);
if (flags & SIGN)
num = (short) num;
} else if (flags & SIGN)
num = va_arg(args, int);
else
num = va_arg(args, uint);
}
str = number(str, num, base, field_width, precision, flags, size);
if (!str)
return -1;

16
lib/printf_test.c
View File

@ -45,7 +45,7 @@ t_simple(void)
else
BSPRINTF(16, "00000fee1a15600d", buf, "%p", (void *) 0xfee1a15600d);
long ln = 0;
s64 ln = 0;
BSPRINTF(10, "TeStStRiNg", buf, "TeStS%lntRiNg", &ln);
bt_assert_msg(ln == 5, "fmt=\"TeStS%%lntRiNg\", &ln makes ln=%ld, want 5", ln);
@ -54,7 +54,19 @@ t_simple(void)
BSPRINTF(2, "+1", buf, "%+d", 1);
BSPRINTF(2, " 1", buf, "% d", 1);
BSPRINTF(2, "-1", buf, "%d", -1);
BSPRINTF(11, "-2147483648", buf, "%d", -2147483648);
BSPRINTF(11, "-2147483648", buf, "%d", INT32_MIN);
BSPRINTF(10, "2147483647", buf, "%d", INT32_MAX);
BSPRINTF(1, "0", buf, "%u", 0x0);
BSPRINTF(10, "4294967295", buf, "%u", 0xFFFFFFFF);
BSPRINTF(4, "-100", buf, "%ld", (s64) -100);
BSPRINTF(3, "100", buf, "%ld", (s64) 100);
BSPRINTF(20, "-9223372036854775808", buf, "%ld", INT64_MIN);
BSPRINTF(19, "9223372036854775807", buf, "%ld", INT64_MAX);
BSPRINTF(3, "0 8", buf, "%lu %lu", U64(0), U64(8));
BSPRINTF(20, "18446744073709551615", buf, "%lu", UINT64_MAX);
return 1;
}

2
proto/perf/perf.c
View File

@ -192,7 +192,7 @@ perf_loop(void *data)
s64 withdrawtime = timediff(&ts_update, &ts_withdraw);
if (updatetime NS >= p->threshold_min)
PLOG("exp=%u times: gen=%lu update=%lu withdraw=%lu",
PLOG("exp=%u times: gen=%ld update=%ld withdraw=%ld",
p->exp, gentime, updatetime, withdrawtime);
if (updatetime NS < p->threshold_max)

2
sysdep/unix/main.c
View File

@ -533,7 +533,7 @@ write_pid_file(void)
/* We don't use PID file for uniqueness, so no need for locking */
pl = bsnprintf(ps, sizeof(ps), "%ld\n", (long) getpid());
pl = bsnprintf(ps, sizeof(ps), "%ld\n", (s64) getpid());
if (pl < 0)
bug("PID buffer too small");