vsscanf.c

从iccavr7中破解得到的lib库源代码

#include <stdarg.h>
#include "_stdio.h"

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 vsscanf(char *buf, const char *fmt, va_list va)
	{
	int n;

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

#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