95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
#include <stdlib.h>
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#include <ctype.h>
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#include <limits.h>
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#include <errno.h>
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static int is_valid(int base, char c) {
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if (c < '0') return 0;
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if (base <= 10) {
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return c < ('0' + base);
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}
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if (c >= 'a' && c < 'a' + (base - 10)) return 1;
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if (c >= 'A' && c < 'A' + (base - 10)) return 1;
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if (c >= '0' && c <= '9') return 1;
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return 0;
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}
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static int convert_digit(char c) {
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if (c >= '0' && c <= '9') {
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return c - '0';
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}
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if (c >= 'a' && c <= 'z') {
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return c - 'a' + 0xa;
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}
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if (c >= 'A' && c <= 'Z') {
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return c - 'A' + 0xa;
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}
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return 0;
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}
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#define strtox(max, type) \
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if (base < 0 || base == 1 || base > 36) { \
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errno = EINVAL; \
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return max; \
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} \
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while (*nptr && isspace(*nptr)) nptr++; \
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int sign = 1; \
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if (*nptr == '-') { \
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sign = -1; \
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nptr++; \
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} else if (*nptr == '+') { \
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nptr++; \
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} \
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if (base == 16) { \
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if (*nptr == '0') { \
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nptr++; \
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if (*nptr == 'x') { \
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nptr++; \
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} \
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} \
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} \
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if (base == 0) { \
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if (*nptr == '0') { \
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base = 8; \
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nptr++; \
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if (*nptr == 'x') { \
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base = 16; \
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nptr++; \
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} \
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} else { \
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base = 10; \
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} \
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} \
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type val = 0; \
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while (is_valid(base, *nptr)) { \
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val *= base; \
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val += convert_digit(*nptr); \
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nptr++; \
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} \
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if (endptr) { \
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*endptr = (char *)nptr; \
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} \
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if (sign == -1) { \
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return -val; \
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} else { \
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return val; \
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}
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unsigned long int strtoul(const char *nptr, char **endptr, int base) {
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strtox(ULONG_MAX, unsigned long int);
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}
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unsigned long long int strtoull(const char *nptr, char **endptr, int base) {
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strtox(ULLONG_MAX, unsigned long int);
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}
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long int strtol(const char *nptr, char **endptr, int base) {
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strtox(LONG_MAX, unsigned long int);
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}
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long long int strtoll(const char *nptr, char **endptr, int base) {
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strtox(LLONG_MAX, unsigned long long int);
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}
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