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- #include <u.h>
- #include <libc.h>
- long
- atol(char *s)
- {
- long n;
- int f, c;
- n = 0;
- f = 0;
- while(*s == ' ' || *s == '\t')
- s++;
- if(*s == '-' || *s == '+') {
- if(*s++ == '-')
- f = 1;
- while(*s == ' ' || *s == '\t')
- s++;
- }
- if(s[0]=='0' && s[1]) {
- if(s[1]=='x' || s[1]=='X'){
- s += 2;
- for(;;) {
- c = *s;
- if(c >= '0' && c <= '9')
- n = n*16 + c - '0';
- else
- if(c >= 'a' && c <= 'f')
- n = n*16 + c - 'a' + 10;
- else
- if(c >= 'A' && c <= 'F')
- n = n*16 + c - 'A' + 10;
- else
- break;
- s++;
- }
- } else
- while(*s >= '0' && *s <= '7')
- n = n*8 + *s++ - '0';
- } else
- while(*s >= '0' && *s <= '9')
- n = n*10 + *s++ - '0';
- if(f)
- n = -n;
- return n;
- }
- int
- atoi(char *s)
- {
- return atol(s);
- }
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