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- /*
- * Test cases for printf facility.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/printk.h>
- #include <linux/random.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #define BUF_SIZE 256
- #define FILL_CHAR '$'
- #define PTR1 ((void*)0x01234567)
- #define PTR2 ((void*)(long)(int)0xfedcba98)
- #if BITS_PER_LONG == 64
- #define PTR1_ZEROES "000000000"
- #define PTR1_SPACES " "
- #define PTR1_STR "1234567"
- #define PTR2_STR "fffffffffedcba98"
- #define PTR_WIDTH 16
- #else
- #define PTR1_ZEROES "0"
- #define PTR1_SPACES " "
- #define PTR1_STR "1234567"
- #define PTR2_STR "fedcba98"
- #define PTR_WIDTH 8
- #endif
- #define PTR_WIDTH_STR stringify(PTR_WIDTH)
- static unsigned total_tests __initdata;
- static unsigned failed_tests __initdata;
- static char *test_buffer __initdata;
- static int __printf(4, 0) __init
- do_test(int bufsize, const char *expect, int elen,
- const char *fmt, va_list ap)
- {
- va_list aq;
- int ret, written;
- total_tests++;
- memset(test_buffer, FILL_CHAR, BUF_SIZE);
- va_copy(aq, ap);
- ret = vsnprintf(test_buffer, bufsize, fmt, aq);
- va_end(aq);
- if (ret != elen) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
- bufsize, fmt, ret, elen);
- return 1;
- }
- if (!bufsize) {
- if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE)) {
- pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
- fmt);
- return 1;
- }
- return 0;
- }
- written = min(bufsize-1, elen);
- if (test_buffer[written]) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
- bufsize, fmt);
- return 1;
- }
- if (memcmp(test_buffer, expect, written)) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
- bufsize, fmt, test_buffer, written, expect);
- return 1;
- }
- return 0;
- }
- static void __printf(3, 4) __init
- __test(const char *expect, int elen, const char *fmt, ...)
- {
- va_list ap;
- int rand;
- char *p;
- BUG_ON(elen >= BUF_SIZE);
- va_start(ap, fmt);
- /*
- * Every fmt+args is subjected to four tests: Three where we
- * tell vsnprintf varying buffer sizes (plenty, not quite
- * enough and 0), and then we also test that kvasprintf would
- * be able to print it as expected.
- */
- failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
- rand = 1 + prandom_u32_max(elen+1);
- /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
- failed_tests += do_test(rand, expect, elen, fmt, ap);
- failed_tests += do_test(0, expect, elen, fmt, ap);
- p = kvasprintf(GFP_KERNEL, fmt, ap);
- if (p) {
- if (memcmp(p, expect, elen+1)) {
- pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
- fmt, p, expect);
- failed_tests++;
- }
- kfree(p);
- }
- va_end(ap);
- }
- #define test(expect, fmt, ...) \
- __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
- static void __init
- test_basic(void)
- {
- /* Work around annoying "warning: zero-length gnu_printf format string". */
- char nul = '\0';
- test("", &nul);
- test("100%", "100%%");
- test("xxx%yyy", "xxx%cyyy", '%');
- __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
- }
- static void __init
- test_number(void)
- {
- test("0x1234abcd ", "%#-12x", 0x1234abcd);
- test(" 0x1234abcd", "%#12x", 0x1234abcd);
- test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
- }
- static void __init
- test_string(void)
- {
- test("", "%s%.0s", "", "123");
- test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
- test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
- /*
- * POSIX and C99 say that a missing precision should be
- * treated as a precision of 0. However, the kernel's printf
- * implementation treats this case as if the . wasn't
- * present. Let's add a test case documenting the current
- * behaviour; should anyone ever feel the need to follow the
- * standards more closely, this can be revisited.
- */
- test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
- test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
- }
- static void __init
- plain(void)
- {
- test(PTR1_ZEROES PTR1_STR " " PTR2_STR, "%p %p", PTR1, PTR2);
- /*
- * The field width is overloaded for some %p extensions to
- * pass another piece of information. For plain pointers, the
- * behaviour is slightly odd: One cannot pass either the 0
- * flag nor a precision to %p without gcc complaining, and if
- * one explicitly gives a field width, the number is no longer
- * zero-padded.
- */
- test("|" PTR1_STR PTR1_SPACES " | " PTR1_SPACES PTR1_STR "|",
- "|%-*p|%*p|", PTR_WIDTH+2, PTR1, PTR_WIDTH+2, PTR1);
- test("|" PTR2_STR " | " PTR2_STR "|",
- "|%-*p|%*p|", PTR_WIDTH+2, PTR2, PTR_WIDTH+2, PTR2);
- /*
- * Unrecognized %p extensions are treated as plain %p, but the
- * alphanumeric suffix is ignored (that is, does not occur in
- * the output.)
- */
- test("|"PTR1_ZEROES PTR1_STR"|", "|%p0y|", PTR1);
- test("|"PTR2_STR"|", "|%p0y|", PTR2);
- }
- static void __init
- symbol_ptr(void)
- {
- }
- static void __init
- kernel_ptr(void)
- {
- }
- static void __init
- struct_resource(void)
- {
- }
- static void __init
- addr(void)
- {
- }
- static void __init
- escaped_str(void)
- {
- }
- static void __init
- hex_string(void)
- {
- const char buf[3] = {0xc0, 0xff, 0xee};
- test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
- "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
- test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
- "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
- }
- static void __init
- mac(void)
- {
- const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
- test("2d:48:d6:fc:7a:05", "%pM", addr);
- test("05:7a:fc:d6:48:2d", "%pMR", addr);
- test("2d-48-d6-fc-7a-05", "%pMF", addr);
- test("2d48d6fc7a05", "%pm", addr);
- test("057afcd6482d", "%pmR", addr);
- }
- static void __init
- ip4(void)
- {
- struct sockaddr_in sa;
- sa.sin_family = AF_INET;
- sa.sin_port = cpu_to_be16(12345);
- sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
- test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
- test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
- sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
- test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
- }
- static void __init
- ip6(void)
- {
- }
- static void __init
- ip(void)
- {
- ip4();
- ip6();
- }
- static void __init
- uuid(void)
- {
- const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
- 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
- test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
- test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
- test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
- test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
- }
- static void __init
- dentry(void)
- {
- }
- static void __init
- struct_va_format(void)
- {
- }
- static void __init
- struct_clk(void)
- {
- }
- static void __init
- bitmap(void)
- {
- DECLARE_BITMAP(bits, 20);
- const int primes[] = {2,3,5,7,11,13,17,19};
- int i;
- bitmap_zero(bits, 20);
- test("00000|00000", "%20pb|%*pb", bits, 20, bits);
- test("|", "%20pbl|%*pbl", bits, 20, bits);
- for (i = 0; i < ARRAY_SIZE(primes); ++i)
- set_bit(primes[i], bits);
- test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
- test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
- bitmap_fill(bits, 20);
- test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
- test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
- }
- static void __init
- netdev_features(void)
- {
- }
- static void __init
- test_pointer(void)
- {
- plain();
- symbol_ptr();
- kernel_ptr();
- struct_resource();
- addr();
- escaped_str();
- hex_string();
- mac();
- ip();
- uuid();
- dentry();
- struct_va_format();
- struct_clk();
- bitmap();
- netdev_features();
- }
- static int __init
- test_printf_init(void)
- {
- test_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
- if (!test_buffer)
- return -ENOMEM;
- test_basic();
- test_number();
- test_string();
- test_pointer();
- kfree(test_buffer);
- if (failed_tests == 0)
- pr_info("all %u tests passed\n", total_tests);
- else
- pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
- return failed_tests ? -EINVAL : 0;
- }
- module_init(test_printf_init);
- MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
- MODULE_LICENSE("GPL");
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