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vsprintf: Add support for the %pV format-specifier

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Add support for the %pV format-specifier which allows printing a
struct va_format. This is used by the Linux kernel for recursive
printf() formatting and is needed by the ext4l filesystem driver.

Add the struct to include/linux/printk.h to match the kernel location.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-06 15:24:02 -07:00
parent d843258d52
commit 2ddc96ae88
4 changed files with 84 additions and 0 deletions
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48
test/common/print.c
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@@ -9,8 +9,10 @@
#include <log.h>
#include <mapmem.h>
#include <version_string.h>
#include <stdarg.h>
#include <stdio.h>
#include <vsprintf.h>
#include <linux/printk.h>
#include <test/common.h>
#include <test/test.h>
#include <test/ut.h>
@@ -376,3 +378,49 @@ static int snprint(struct unit_test_state *uts)
return 0;
}
COMMON_TEST(snprint, 0);
/* Helper function to test %pV format specifier */
static int print_with_va_format(char *buf, size_t size, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
int ret;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
ret = snprintf(buf, size, "prefix: %pV :suffix", &vaf);
va_end(args);
return ret;
}
/* Test printing with %pV (struct va_format) */
static int print_va_format(struct unit_test_state *uts)
{
char str[64];
int ret;
/* Basic string */
ret = print_with_va_format(str, sizeof(str), "hello");
ut_asserteq_str("prefix: hello :suffix", str);
ut_asserteq(21, ret);
/* String with arguments */
ret = print_with_va_format(str, sizeof(str), "value=%d", 42);
ut_asserteq_str("prefix: value=42 :suffix", str);
ut_asserteq(24, ret);
/* Multiple arguments */
ret = print_with_va_format(str, sizeof(str), "%s: %d/%d", "test", 1, 2);
ut_asserteq_str("prefix: test: 1/2 :suffix", str);
ut_asserteq(25, ret);
/* Truncation */
ret = print_with_va_format(str, 15, "hello world");
ut_asserteq_str("prefix: hello ", str);
ut_asserteq(27, ret);
return 0;
}
COMMON_TEST(print_va_format, 0);