source:
trunk/sys/dietlibc/atoi.c
@
254
| Last change on this file since 254 was 1, checked in by , 8 years ago | |
|---|---|
| File size: 359 bytes | |
| Rev | Line | |
|---|---|---|
| [1] | 1 | #include <endian.h> |
| 2 | #include <ctype.h> | |
| 3 | #include <stdlib.h> | |
| 4 | ||
| 5 | #if __WORDSIZE == 64 | |
| 6 | int atoi(const char* s) { | |
| 7 | long int v=0; | |
| 8 | int sign=1; | |
| 9 | while ( *s == ' ' || (unsigned int)(*s - 9) < 5u) s++; | |
| 10 | switch (*s) { | |
| 11 | case '-': sign=-1; | |
| 12 | case '+': ++s; | |
| 13 | } | |
| 14 | while ((unsigned int) (*s - '0') < 10u) { | |
| 15 | v=v*10+*s-'0'; ++s; | |
| 16 | } | |
| 17 | return sign==-1?-v:v; | |
| 18 | } | |
| 19 | #endif |
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