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| Source at commit 1295 created 12 years 8 months ago. By meklort, Remove libsaio.h from klibc | |
|---|---|
| 1 | /*␊ |
| 2 | * strntoumax.c␊ |
| 3 | *␊ |
| 4 | * The strntoumax() function and associated␊ |
| 5 | */␊ |
| 6 | #include <stdlib.h>␊ |
| 7 | #include <stdint.h>␊ |
| 8 | #include <ctype.h>␊ |
| 9 | ␊ |
| 10 | static inline int digitval(int ch)␊ |
| 11 | {␊ |
| 12 | ␉if (ch >= '0' && ch <= '9') {␊ |
| 13 | ␉␉return ch - '0';␊ |
| 14 | ␉} else if (ch >= 'A' && ch <= 'Z') {␊ |
| 15 | ␉␉return ch - 'A' + 10;␊ |
| 16 | ␉} else if (ch >= 'a' && ch <= 'z') {␊ |
| 17 | ␉␉return ch - 'a' + 10;␊ |
| 18 | ␉} else {␊ |
| 19 | ␉␉return -1;␊ |
| 20 | ␉}␊ |
| 21 | }␊ |
| 22 | ␊ |
| 23 | uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n)␊ |
| 24 | {␊ |
| 25 | ␉int minus = 0;␊ |
| 26 | ␉uintmax_t v = 0;␊ |
| 27 | ␉int d;␊ |
| 28 | ␊ |
| 29 | ␉while (n && isspace((unsigned char)*nptr)) {␊ |
| 30 | ␉␉nptr++;␊ |
| 31 | ␉␉n--;␊ |
| 32 | ␉}␊ |
| 33 | ␊ |
| 34 | ␉/* Single optional + or - */␊ |
| 35 | ␉if (n) {␊ |
| 36 | ␉␉char c = *nptr;␊ |
| 37 | ␉␉if (c == '-' || c == '+') {␊ |
| 38 | ␉␉␉minus = (c == '-');␊ |
| 39 | ␉␉␉nptr++;␊ |
| 40 | ␉␉␉n--;␊ |
| 41 | ␉␉}␊ |
| 42 | ␉}␊ |
| 43 | ␊ |
| 44 | ␉if (base == 0) {␊ |
| 45 | ␉␉if (n >= 2 && nptr[0] == '0' &&␊ |
| 46 | ␉␉ (nptr[1] == 'x' || nptr[1] == 'X')) {␊ |
| 47 | ␉␉␉n -= 2;␊ |
| 48 | ␉␉␉nptr += 2;␊ |
| 49 | ␉␉␉base = 16;␊ |
| 50 | ␉␉} else if (n >= 1 && nptr[0] == '0') {␊ |
| 51 | ␉␉␉n--;␊ |
| 52 | ␉␉␉nptr++;␊ |
| 53 | ␉␉␉base = 8;␊ |
| 54 | ␉␉} else {␊ |
| 55 | ␉␉␉base = 10;␊ |
| 56 | ␉␉}␊ |
| 57 | ␉} else if (base == 16) {␊ |
| 58 | ␉␉if (n >= 2 && nptr[0] == '0' &&␊ |
| 59 | ␉␉ (nptr[1] == 'x' || nptr[1] == 'X')) {␊ |
| 60 | ␉␉␉n -= 2;␊ |
| 61 | ␉␉␉nptr += 2;␊ |
| 62 | ␉␉}␊ |
| 63 | ␉}␊ |
| 64 | ␊ |
| 65 | ␉while (n && (d = digitval(*nptr)) >= 0 && d < base) {␊ |
| 66 | ␉␉v = v * base + d;␊ |
| 67 | ␉␉n--;␊ |
| 68 | ␉␉nptr++;␊ |
| 69 | ␉}␊ |
| 70 | ␊ |
| 71 | ␉if (endptr)␊ |
| 72 | ␉␉*endptr = (char *)nptr;␊ |
| 73 | ␊ |
| 74 | ␉return minus ? -v : v;␊ |
| 75 | }␊ |
| 76 | |
