kern
view src/klibc/stdlib.c @ 80:4db99a52863e
fixed the "endianess" of the text messages in the ATA identify info block. this
is the first time I've seen wrong byteorder in ascii text, the ATA committee
should be commended.
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 06 Dec 2011 13:35:39 +0200 |
| parents | |
| children | f83f50c17c3b |
line source
1 #include <stdlib.h>
2 #include <ctype.h>
4 int atoi(const char *str)
5 {
6 return atol(str);
7 }
9 long atol(const char *str)
10 {
11 long acc = 0;
12 int sign = 1;
14 while(isspace(*str)) str++;
16 if(*str == '+') {
17 str++;
18 } else if(*str == '-') {
19 sign = -1;
20 str++;
21 }
23 while(*str && isdigit(*str)) {
24 acc = acc * 10 + (*str - '0');
25 str++;
26 }
28 return sign > 0 ? acc : -acc;
29 }
31 void itoa(int val, char *buf, int base)
32 {
33 static char rbuf[16];
34 char *ptr = rbuf;
35 int neg = 0;
37 if(val < 0) {
38 neg = 1;
39 val = -val;
40 }
42 if(val == 0) {
43 *ptr++ = '0';
44 }
46 while(val) {
47 int digit = val % base;
48 *ptr++ = digit < 10 ? (digit + '0') : (digit - 10 + 'a');
49 val /= base;
50 }
52 if(neg) {
53 *ptr++ = '-';
54 }
56 ptr--;
58 while(ptr >= rbuf) {
59 *buf++ = *ptr--;
60 }
61 *buf = 0;
62 }
64 void utoa(unsigned int val, char *buf, int base)
65 {
66 static char rbuf[16];
67 char *ptr = rbuf;
69 if(val == 0) {
70 *ptr++ = '0';
71 }
73 while(val) {
74 unsigned int digit = val % base;
75 *ptr++ = digit < 10 ? (digit + '0') : (digit - 10 + 'a');
76 val /= base;
77 }
79 ptr--;
81 while(ptr >= rbuf) {
82 *buf++ = *ptr--;
83 }
84 *buf = 0;
85 }