1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/*
20130604
Jan Mojzis
Public domain.
*/
#include "numtostr.h"
/*
The 'numtostr(strbuf,n)' converts number 'n' into the 0-terminated string.
The caller must allocate at least NUMTOSTR_LEN bytes for 'strbuf'.
The 'numtostr' function is ready for 128-bit integer.
*/
char *numtostr(char *strbuf, long long n) {
long long len = 0;
unsigned long long n1, n2;
static char staticbuf[NUMTOSTR_LEN];
int flagsign = 0;
if (!strbuf) strbuf = staticbuf; /* not thread-safe */
if (n < 0) {
n1 = n2 = -(unsigned long long)n;
flagsign = 1;
}
else {
n1 = n2 = (unsigned long long)n;
}
do {
n1 /= 10; ++len;
} while (n1);
if (flagsign) ++len;
strbuf += len;
do {
*--strbuf = '0' + (n2 % 10);
n2 /= 10;
} while (n2);
if (flagsign) *--strbuf = '-';
while (len < NUMTOSTR_LEN) strbuf[len++] = 0;
return strbuf;
}
|
