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#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <ctype.h>
#define ATOX(name, type) \
type name(const char* s) { \
for(; isspace(*s); s++); \
int neg = 0; \
switch (*s) { \
case '-': \
neg = 1; \
/* FALLTHRU */ \
case '+': \
s++; \
break; \
} \
type num = 0; \
for (; *s == '0'; s++); \
for (; isdigit(*s); s++) { \
num *= 10; \
num += *s - '0'; \
} \
return num * (neg ? -1 : 1); \
}
ATOX(atoi, int)
ATOX(atol, long int)
ATOX(atoll, long long int)
char itoc(int i) {
if(i < 10) {
return '0' + i;
} else {
return 'a' + (i - 10);
}
}
int ctoi(char c) {
if(c < 'A') {
return c - '0';
} else if(c < 'a') {
return c - 'A' + 10;
} else {
return c - 'a' + 10;
}
}
#define UXTOA(type, name) \
char *name(unsigned type n, char *buffer, int radix) { \
if (n == 0) { \
buffer[0] = '0'; \
buffer[1] = '\0'; \
return buffer; \
} \
char *start = buffer; \
for (; n; n /= radix) { \
*buffer++ = itoc(n % radix); \
} \
*buffer-- = '\0'; \
while(buffer > start) { \
char tmp = *start; \
*start++ = *buffer; \
*buffer-- = tmp; \
} \
return buffer; \
}
UXTOA(int, utoa)
UXTOA(long int, ultoa)
#define XTOA(type, name) \
char *name(type n, char* buffer, int radix) { \
if (n == 0) { \
buffer[0] = '0'; \
buffer[1] = '\0'; \
return buffer; \
} \
if (n < 0) { \
*buffer++ = '-'; \
n = -n; \
} \
char *start = buffer; \
for (; n; n /= radix) { \
*buffer++ = itoc(n % radix); \
} \
*buffer-- = '\0'; \
while(buffer > start) { \
char tmp = *start; \
*start++ = *buffer; \
*buffer-- = tmp; \
} \
return buffer; \
}
XTOA(int, itoa)
XTOA(long int, ltoa)
char *ftoa(float f, char *buffer) {
char *b = buffer;
if (f < 0 || f == -0)
*buffer++ = '-';
int n, i=0, k=0;
n = (int) f;
while (n > 0) {
f /= 10;
n = (int)f;
i++;
}
*(buffer+i) = '.';
f *= 10;
n = (int) f;
f -= n;
while ((n > 0.1) || (i > k)) {
if (k == i)
k++;
*(buffer+k) = '0' + n;
f *= 10;
n = (int) f;
f -= n;
k++;
}
*(buffer+k) = '\0';
return b;
}
#define STRTOX(name, type) \
type name(const char *s, char **endptr, int radix) { \
*endptr = NULL; \
for(; isspace(*s); s++); \
int neg = 0; \
switch (*s) { \
case '-': \
neg = 1; \
/* FALLTHRU */ \
case '+': \
s++; \
break; \
} \
if (!radix) { \
if (*s == '0') { \
s++; \
if (*s == 'x' || *s == 'X') { \
s++; \
radix = 16; \
} else { \
radix = 8; \
} \
} else { \
radix = 10; \
} \
} \
for (; *s == '0'; s++, *endptr = (void*) s); \
type num = 0; \
for (; isdigit(*s); s++, *endptr = (void*) s) { \
num *= radix; \
num += *s - '0'; \
} \
return num * (neg ? -1 : 1); \
}
STRTOX(strtoi, int)
STRTOX(strtol, long int)
STRTOX(strtoll, long long int)
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