csscanf.c

avr的icc编译器的源代码

#include <stdarg.h>
#include <_const.h>
extern void _scanf(char (*)(void), void (*)(char), CONST char *, va_list);

static char *p;
static char c;
static char _geti(void)
	{
	char v;

	if (c)
		{
		v = c;
		c = 0;
		}
	else
		{
		v = *p;
		if (v)
			p++;
		}
	return v;
	}

static void _ungeti(char v)
	{
	c = v;
	}

int sscanf(char *buf, CONST char *fmt, ...)
	{
	va_list va;

	c = 0;
	p = buf;
	va_start(va, fmt);
	_scanf(_geti, _ungeti, fmt, va);
	if (c)
		--p;
	va_end(va);
	return p - buf;
	}

#if 0
main()
	{
	int c, i, j;

	c = xsscanf("hello", "hello");
	printf("5 is %d\n", c);
	c = xsscanf("hello 10", "hello %d", &i);
	printf("8 is %d 10 is %d\n", c, i);
	c = xsscanf("hello 10 20", "hello %d %u", &i, &j);
	printf("11 is %d 10 is %d 20 is %d\n", c, i, j);
	c = xsscanf("hello 10", "hello %x", &i);
	printf("8 is %d 16 is %d\n", c, i);
	c = xsscanf("hello 10", "hello %lx", &i);
	printf("8 is %d 16 is %d\n", c, i);
	}
#endif