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/* This code is a modified and condensed version of the int -> str routines
* found in yyjson (https://github.com/ibireme/yyjson). The yyjson license
* is copied below:
*
* Copyright (c) 2020 YaoYuan <ibireme@gmail.com>
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef MS_ITOA_H
#define MS_ITOA_H
#include <stdlib.h>
#include "common.h"
static const char DIGIT_TABLE[200] = {
'0','0','0','1','0','2','0','3','0','4','0','5','0','6','0','7','0','8','0','9',
'1','0','1','1','1','2','1','3','1','4','1','5','1','6','1','7','1','8','1','9',
'2','0','2','1','2','2','2','3','2','4','2','5','2','6','2','7','2','8','2','9',
'3','0','3','1','3','2','3','3','3','4','3','5','3','6','3','7','3','8','3','9',
'4','0','4','1','4','2','4','3','4','4','4','5','4','6','4','7','4','8','4','9',
'5','0','5','1','5','2','5','3','5','4','5','5','5','6','5','7','5','8','5','9',
'6','0','6','1','6','2','6','3','6','4','6','5','6','6','6','7','6','8','6','9',
'7','0','7','1','7','2','7','3','7','4','7','5','7','6','7','7','7','8','7','9',
'8','0','8','1','8','2','8','3','8','4','8','5','8','6','8','7','8','8','8','9',
'9','0','9','1','9','2','9','3','9','4','9','5','9','6','9','7','9','8','9','9'
};
static MS_INLINE void
write_u32_8_digits(uint32_t x, char *buf) {
uint32_t aabb, ccdd, aa, bb, cc, dd;
aabb = (uint32_t)(((uint64_t)x * 109951163) >> 40); /* (x / 10000) */
ccdd = x - aabb * 10000; /* (x % 10000) */
aa = (aabb * 5243) >> 19; /* (aabb / 100) */
bb = aabb - aa * 100; /* (aabb % 100) */
cc = (ccdd * 5243) >> 19; /* (ccdd / 100) */
dd = ccdd - cc * 100; /* (ccdd % 100) */
memcpy(buf + 0, DIGIT_TABLE + aa * 2, 2);
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
memcpy(buf + 6, DIGIT_TABLE + dd * 2, 2);
}
static MS_INLINE void
write_u32_6_digits(uint32_t x, char *buf) {
uint32_t aa, bbcc, bb, cc;
aa = (uint32_t)(((uint64_t)x * 109951163) >> 40); /* (x / 10000) */
bbcc = x - aa * 10000; /* (x % 10000) */
bb = (bbcc * 5243) >> 19; /* (bbcc / 100) */
cc = bbcc - bb * 100; /* (bbcc % 100) */
memcpy(buf + 0, DIGIT_TABLE + aa * 2, 2);
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
}
static MS_INLINE void
write_u32_4_digits(uint32_t x, char *buf) {
uint32_t aa, bb;
aa = (x * 5243) >> 19; /* (x / 100) */
bb = x - aa * 100; /* (x % 100) */
memcpy(buf + 0, DIGIT_TABLE + aa * 2, 2);
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
}
static MS_INLINE void
write_u32_2_digits(uint32_t x, char *buf) {
memcpy(buf, DIGIT_TABLE + x * 2, 2);
}
static MS_INLINE char *
write_u32_1_to_8_digits(uint32_t x, char *buf) {
uint32_t aa, bb, cc, dd, aabb, bbcc, ccdd, lz;
if (x < 100) { /* 1-2 digits */
lz = x < 10;
memcpy(buf + 0, DIGIT_TABLE + x * 2 + lz, 2);
buf -= lz;
return buf + 2;
} else if (x < 10000) { /* 3-4 digits */
aa = (x * 5243) >> 19; /* (x / 100) */
bb = x - aa * 100; /* (x % 100) */
lz = aa < 10;
memcpy(buf + 0, DIGIT_TABLE + aa * 2 + lz, 2);
buf -= lz;
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
return buf + 4;
} else if (x < 1000000) { /* 5-6 digits */
aa = (uint32_t)(((uint64_t)x * 429497) >> 32); /* (x / 10000) */
bbcc = x - aa * 10000; /* (x % 10000) */
bb = (bbcc * 5243) >> 19; /* (bbcc / 100) */
cc = bbcc - bb * 100; /* (bbcc % 100) */
lz = aa < 10;
memcpy(buf + 0, DIGIT_TABLE + aa * 2 + lz, 2);
buf -= lz;
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
return buf + 6;
} else { /* 7-8 digits */
aabb = (uint32_t)(((uint64_t)x * 109951163) >> 40); /* (x / 10000) */
ccdd = x - aabb * 10000; /* (x % 10000) */
aa = (aabb * 5243) >> 19; /* (aabb / 100) */
bb = aabb - aa * 100; /* (aabb % 100) */
cc = (ccdd * 5243) >> 19; /* (ccdd / 100) */
dd = ccdd - cc * 100; /* (ccdd % 100) */
lz = aa < 10;
memcpy(buf + 0, DIGIT_TABLE + aa * 2 + lz, 2);
buf -= lz;
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
memcpy(buf + 6, DIGIT_TABLE + dd * 2, 2);
return buf + 8;
}
}
static MS_INLINE char *
write_u64_5_to_8_digits(uint32_t x, char *buf) {
uint32_t aa, bb, cc, dd, aabb, bbcc, ccdd, lz;
if (x < 1000000) { /* 5-6 digits */
aa = (uint32_t)(((uint64_t)x * 429497) >> 32); /* (x / 10000) */
bbcc = x - aa * 10000; /* (x % 10000) */
bb = (bbcc * 5243) >> 19; /* (bbcc / 100) */
cc = bbcc - bb * 100; /* (bbcc % 100) */
lz = aa < 10;
memcpy(buf + 0, DIGIT_TABLE + aa * 2 + lz, 2);
buf -= lz;
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
return buf + 6;
} else { /* 7-8 digits */
aabb = (uint32_t)(((uint64_t)x * 109951163) >> 40); /* (x / 10000) */
ccdd = x - aabb * 10000; /* (x % 10000) */
aa = (aabb * 5243) >> 19; /* (aabb / 100) */
bb = aabb - aa * 100; /* (aabb % 100) */
cc = (ccdd * 5243) >> 19; /* (ccdd / 100) */
dd = ccdd - cc * 100; /* (ccdd % 100) */
lz = aa < 10;
memcpy(buf + 0, DIGIT_TABLE + aa * 2 + lz, 2);
buf -= lz;
memcpy(buf + 2, DIGIT_TABLE + bb * 2, 2);
memcpy(buf + 4, DIGIT_TABLE + cc * 2, 2);
memcpy(buf + 6, DIGIT_TABLE + dd * 2, 2);
return buf + 8;
}
}
/* Write a uint64 to buf, requires 20 bytes of space */
static inline char *
write_u64(uint64_t x, char *buf) {
uint64_t tmp, hgh;
uint32_t mid, low;
if (x < 100000000) { /* 1-8 digits */
return write_u32_1_to_8_digits((uint32_t)x, buf);
} else if (x < (uint64_t)100000000 * 100000000) { /* 9-16 digits */
hgh = x / 100000000; /* (x / 100000000) */
low = (uint32_t)(x - hgh * 100000000); /* (x % 100000000) */
char *cur = write_u32_1_to_8_digits((uint32_t)hgh, buf);
write_u32_8_digits(low, cur);
return cur + 8;
} else { /* 17-20 digits */
tmp = x / 100000000; /* (x / 100000000) */
low = (uint32_t)(x - tmp * 100000000); /* (x % 100000000) */
hgh = (uint32_t)(tmp / 10000); /* (tmp / 10000) */
mid = (uint32_t)(tmp - hgh * 10000); /* (tmp % 10000) */
char *cur = write_u64_5_to_8_digits((uint32_t)hgh, buf);
write_u32_4_digits(mid, cur);
write_u32_8_digits(low, cur + 4);
return cur + 12;
}
}
#endif // MS_ITOA_H
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