1 #include "lib9.h" 2 3 vlong 4 strtoll(const char *nptr, char **endptr, int base) 5 { 6 const char *p; 7 vlong n; 8 int c, v, neg, ndig; 9 10 p = nptr; 11 neg = 0; 12 n = 0; 13 ndig = 0; 14 15 /* 16 * White space 17 */ 18 for(;;p++){ 19 switch(*p){ 20 case ' ': 21 case '\t': 22 case '\n': 23 case '\f': 24 case '\r': 25 case '\v': 26 continue; 27 } 28 break; 29 } 30 31 /* 32 * Sign 33 */ 34 if(*p=='-' || *p=='+') 35 if(*p++ == '-') 36 neg = 1; 37 38 /* 39 * Base 40 */ 41 if(base==0){ 42 if(*p != '0') 43 base = 10; 44 else{ 45 base = 8; 46 if(p[1]=='x' || p[1]=='X'){ 47 p += 2; 48 base = 16; 49 } 50 } 51 }else if(base==16 && *p=='0'){ 52 if(p[1]=='x' || p[1]=='X') 53 p += 2; 54 }else if(base<0 || 36<base) 55 goto Return; 56 57 /* 58 * Non-empty sequence of digits 59 */ 60 for(;; p++,ndig++){ 61 c = *p; 62 v = base; 63 if('0'<=c && c<='9') 64 v = c - '0'; 65 else if('a'<=c && c<='z') 66 v = c - 'a' + 10; 67 else if('A'<=c && c<='Z') 68 v = c - 'A' + 10; 69 if(v >= base) 70 break; 71 n = n*base + v; 72 } 73 Return: 74 if(ndig == 0) 75 p = nptr; 76 if(endptr) 77 *endptr = (char*) p; 78 if(neg) 79 return -n; 80 return n; 81 } 82