testvsnp.c

来自「klibc精简化的c程序库」· C语言 代码 · 共 120 行

#include <assert.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>

int main(void)
{
	int r, i;
	char buffer[512];

	r = snprintf(buffer, 512, "Hello, %d", 37);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'d", 37373737);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'x", 0xdeadbeef);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#X", 0xdeadbeef);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#llo", 0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	/* Make sure overflow works correctly */
	memset(buffer, '\xff', 512);
	r = snprintf(buffer, 16, "Hello, %'#llo", 0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
	for (i = 16; i < 512; i++)
		assert(buffer[i] == '\xff');

	r = snprintf(buffer, 512, "Hello, %'#40.20llo", 0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#-40.20llo", 0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#*.*llo", 40, 20,
		     0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#*.*llo", -40, 20,
		     0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#*.*llo", -40, -20,
		     0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %'#*.*llx", -40, -20,
		     0123456701234567ULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %p", &buffer);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %P", &buffer);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %20p", &buffer);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %-20p", &buffer);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 512, "Hello, %-20p", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 20, "Hello, %'-20p", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 15, "Hello, %'-20p", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 3, "Hello, %'-20p", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	/* This shouldn't change buffer in any way! */
	r = snprintf(buffer, 0, "Hello, %'-20p", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	for (i = -30; i <= 30; i++) {
		r = snprintf(buffer, 40, "Hello, %'*p", i, NULL);
		printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer),
		       r);
	}

	r = snprintf(buffer, 40, "Hello, %'-20s", "String");
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'20s", "String");
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'020s", "String");
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'-20s", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'20s", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'020s", NULL);
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'-20c", '*');
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'20c", '*');
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	r = snprintf(buffer, 40, "Hello, %'020c", '*');
	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);

	return 0;
}