xxtoa.c

来自「从iccavr7中破解得到的lib库源代码」· C语言 代码 · 共 22 行

#include <stdlib.h>

// conversion ASCII dependent

#define XTOA(prefix, type, NEGZERO)	\
char *prefix##toa(char* buf, \
type i, int base) 	{	\
    unsigned type j = i; \
    char *s; char *t; char tmp;	\
    if (i == 0 || i == NEGZERO) { buf[0] = '0'; buf[1] = 0; return buf; } \
    if (i < 0 && base == 10) { tmp = 1; j = -j; }			\
    else tmp = 0;									\
    s = buf;	\
    do { int n = j % base;		\
	if (n <= 9) *s++ = '0'+n;	\
	else *s++ = 'a'-10+n;		\
        j /= base; } while (j);	\
    if (tmp) *s++ = '-'; 		\
    *s-- = 0;					\
	for (t = buf; t < s; ) { tmp = *t; *t++ = *s; *s-- = tmp; }	\
    return buf; }