emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

bc: use non-allocated BcNum's where appropriate

Browse Source 
function                                             old     new   delta
zbc_num_printNum                                     540     543      +3
zdc_program_asciify                                  407     403      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 3/-4)               Total: -1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-21 22:36:04 +01:00
parent 6ed7fb0a87
commit e8e7bda63a
1 changed files with 18 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
miscutils/bc.c
View File

@ -1454,6 +1454,14 @@ static BC_STATUS zbc_num_ulong(BcNum *n, unsigned long *result_p)
}
#define zbc_num_ulong(...) (zbc_num_ulong(__VA_ARGS__) COMMA_SUCCESS)
#if ULONG_MAX == 0xffffffffUL // 10 digits: 4294967295
# define ULONG_NUM_BUFSIZE (10 > BC_NUM_DEF_SIZE ? 10 : BC_NUM_DEF_SIZE)
#elif ULONG_MAX == 0xffffffffffffffffULL // 20 digits: 18446744073709551615
# define ULONG_NUM_BUFSIZE (20 > BC_NUM_DEF_SIZE ? 20 : BC_NUM_DEF_SIZE)
#endif
// minimum BC_NUM_DEF_SIZE, so that bc_num_expand() in bc_num_ulong2num()
// would not hit realloc() code path - not good if num[] is not malloced
static void bc_num_ulong2num(BcNum *n, unsigned long val)
{
BcDig *ptr;
@ -1462,11 +1470,7 @@ static void bc_num_ulong2num(BcNum *n, unsigned long val)
if (val == 0) return;
if (ULONG_MAX == 0xffffffffUL)
bc_num_expand(n, 10); // 10 digits: 4294967295
if (ULONG_MAX == 0xffffffffffffffffULL)
bc_num_expand(n, 20); // 20 digits: 18446744073709551615
BUILD_BUG_ON(ULONG_MAX > 0xffffffffffffffffULL);
bc_num_expand(n, ULONG_NUM_BUFSIZE);
ptr = n->num;
for (;;) {
@ -1645,7 +1649,6 @@ static BC_STATUS zbc_num_shift(BcNum *n, size_t places)
static BC_STATUS zbc_num_inv(BcNum *a, BcNum *b, size_t scale)
{
//TODO: nice example of non-allocated BcNum, use in other places as well!
BcNum one;
BcDig num[2];
@ -2264,6 +2267,7 @@ static void bc_num_parseBase(BcNum *n, const char *val, unsigned base_t)
BcStatus s;
BcNum temp, mult, result;
BcNum base;
BcDig base_digs[ULONG_NUM_BUFSIZE];
BcDig c = '\0';
unsigned long v;
size_t i, digits;
@ -2277,8 +2281,8 @@ static void bc_num_parseBase(BcNum *n, const char *val, unsigned base_t)
bc_num_init_DEF_SIZE(&temp);
bc_num_init_DEF_SIZE(&mult);
//TODO: have BcNumSmall type, with static buffer
bc_num_init_DEF_SIZE(&base);
base.cap = ARRAY_SIZE(base_digs);
base.num = base_digs;
bc_num_ulong2num(&base, base_t);
for (;;) {
@ -2329,7 +2333,6 @@ static void bc_num_parseBase(BcNum *n, const char *val, unsigned base_t)
err:
bc_num_free(&result);
int_err:
bc_num_free(&base);
bc_num_free(&mult);
bc_num_free(&temp);
}
@ -5430,6 +5433,7 @@ static BC_STATUS zbc_num_printNum(BcNum *n, unsigned base_t, size_t width, BcNum
BcStatus s;
BcVec stack;
BcNum base;
BcDig base_digs[ULONG_NUM_BUFSIZE];
BcNum intp, fracp, digit, frac_len;
unsigned long dig, *ptr;
size_t i;
@ -5447,8 +5451,8 @@ static BC_STATUS zbc_num_printNum(BcNum *n, unsigned base_t, size_t width, BcNum
bc_num_init(&frac_len, BC_NUM_INT(n));
bc_num_copy(&intp, n);
bc_num_one(&frac_len);
//TODO: have BcNumSmall type, with static buffer
bc_num_init_DEF_SIZE(&base);
base.cap = ARRAY_SIZE(base_digs);
base.num = base_digs;
bc_num_ulong2num(&base, base_t);
bc_num_truncate(&intp, intp.rdx);
@ -5483,7 +5487,6 @@ static BC_STATUS zbc_num_printNum(BcNum *n, unsigned base_t, size_t width, BcNum
if (s) goto err;
}
err:
bc_num_free(&base);
bc_num_free(&frac_len);
bc_num_free(&digit);
bc_num_free(&fracp);
@ -6206,16 +6209,16 @@ static BC_STATUS zdc_program_asciify(void)
if (BC_PROG_NUM(r, num)) {
BcNum strmb;
BcDig strmb_digs[ULONG_NUM_BUFSIZE];
bc_num_init_DEF_SIZE(&n);
bc_num_copy(&n, num);
bc_num_truncate(&n, n.rdx);
//TODO: have BcNumSmall type, with static buffer
bc_num_init_DEF_SIZE(&strmb);
strmb.cap = ARRAY_SIZE(strmb_digs);
strmb.num = strmb_digs;
bc_num_ulong2num(&strmb, 0x100);
s = zbc_num_mod(&n, &strmb, &n, 0);
bc_num_free(&strmb);
if (s) goto num_err;
s = zbc_num_ulong(&n, &val);