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Date: Thu, 19 May 2022 13:24:03 -0400
From: Kent Overstreet <kent.overstreet@...il.com>
To: linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org,
pmladek@...e.com, rostedt@...dmis.org, senozhatsky@...omium.org
Cc: Kent Overstreet <kent.overstreet@...il.com>,
andriy.shevchenko@...ux.intel.com, willy@...radead.org
Subject: [PATCH v2 10/28] vsprintf: pr_u64_minwidth(), pr_u64()
This adds two new-style printbuf helpers for printing simple u64s, and
converts num_to_str() to be a simple wrapper around pr_u64_minwidth().
Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
lib/vsprintf.c | 100 ++++++++++++++++++++++++-------------------------
1 file changed, 48 insertions(+), 52 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index d1372c0b37..3f5638d27a 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -363,41 +363,51 @@ char *put_dec(char *buf, unsigned long long n)
#endif
-/*
- * Convert passed number to decimal string.
- * Returns the length of string. On buffer overflow, returns 0.
- *
- * If speed is not important, use snprintf(). It's easy to read the code.
+/**
+ * pr_u64_minwidth - print a u64, in decimal, with zero padding
+ * @out: printbuf to output to
+ * @num: u64 to print
+ * @width: minimum width
*/
-int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
+void pr_u64_minwidth(struct printbuf *out, u64 num, unsigned width)
{
/* put_dec requires 2-byte alignment of the buffer. */
char tmp[sizeof(num) * 3] __aligned(2);
- int idx, len;
+ unsigned len = put_dec(tmp, num) - tmp;
- /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
- if (num <= 9) {
- tmp[0] = '0' + num;
- len = 1;
- } else {
- len = put_dec(tmp, num) - tmp;
- }
+ printbuf_make_room(out, max(len, width));
- if (len > size || width > size)
- return 0;
+ if (width > len)
+ __pr_chars_reserved(out, '0', width - len);
- if (width > len) {
- width = width - len;
- for (idx = 0; idx < width; idx++)
- buf[idx] = ' ';
- } else {
- width = 0;
- }
+ while (len)
+ __pr_char_reserved(out, tmp[--len]);
+ printbuf_nul_terminate(out);
+}
- for (idx = 0; idx < len; ++idx)
- buf[idx + width] = tmp[len - idx - 1];
+/**
+ * pr_u64 - print a simple u64, in decimal
+ * @out: printbuf to output to
+ * @num: u64 to print
+ */
+void pr_u64(struct printbuf *out, u64 num)
+{
+ pr_u64_minwidth(out, num, 0);
+}
- return len + width;
+/*
+ * Convert passed number to decimal string.
+ * Returns the length of string. On buffer overflow, returns 0.
+ *
+ * Consider switching to printbufs and using pr_u64() or pr_u64_minwith()
+ * instead.
+ */
+int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
+{
+ struct printbuf out = PRINTBUF_EXTERN(buf, size);
+
+ pr_u64_minwidth(&out, num, width);
+ return out.pos;
}
#define SIGN 1 /* unsigned/signed, must be 1 */
@@ -996,20 +1006,6 @@ static const struct printf_spec default_dec_spec = {
.precision = -1,
};
-static const struct printf_spec default_dec02_spec = {
- .base = 10,
- .field_width = 2,
- .precision = -1,
- .flags = ZEROPAD,
-};
-
-static const struct printf_spec default_dec04_spec = {
- .base = 10,
- .field_width = 4,
- .precision = -1,
- .flags = ZEROPAD,
-};
-
static noinline_for_stack
void resource_string(struct printbuf *out, struct resource *res,
struct printf_spec spec, const char *fmt)
@@ -1208,12 +1204,12 @@ void bitmap_list_string(struct printbuf *out, unsigned long *bitmap,
__pr_char(out, ',');
first = false;
- number(out, rbot, default_dec_spec);
+ pr_u64(out, rbot);
if (rtop == rbot + 1)
continue;
- __pr_char(out, '-');
- number(out, rtop - 1, default_dec_spec);
+ pr_char(out, '-');
+ pr_u64(out, rtop - 1);
}
}
@@ -1762,21 +1758,21 @@ void date_str(struct printbuf *out,
int year = tm->tm_year + (r ? 0 : 1900);
int mon = tm->tm_mon + (r ? 0 : 1);
- number(out, year, default_dec04_spec);
- __pr_char(out, '-');
- number(out, mon, default_dec02_spec);
- __pr_char(out, '-');
- number(out, tm->tm_mday, default_dec02_spec);
+ pr_u64_minwidth(out, year, 4);
+ pr_char(out, '-');
+ pr_u64_minwidth(out, mon, 2);
+ pr_char(out, '-');
+ pr_u64_minwidth(out, tm->tm_mday, 2);
}
static noinline_for_stack
void time_str(struct printbuf *out, const struct rtc_time *tm, bool r)
{
- number(out, tm->tm_hour, default_dec02_spec);
+ pr_u64_minwidth(out, tm->tm_hour, 2);
__pr_char(out, ':');
- number(out, tm->tm_min, default_dec02_spec);
+ pr_u64_minwidth(out, tm->tm_min, 2);
__pr_char(out, ':');
- number(out, tm->tm_sec, default_dec02_spec);
+ pr_u64_minwidth(out, tm->tm_sec, 2);
}
static noinline_for_stack
@@ -2054,7 +2050,7 @@ void device_node_string(struct printbuf *out, struct device_node *dn,
str_spec.precision = precision;
break;
case 'p': /* phandle */
- number(out, (unsigned int)dn->phandle, default_dec_spec);
+ pr_u64(out, (unsigned int)dn->phandle);
break;
case 'P': /* path-spec */
p = fwnode_get_name(of_fwnode_handle(dn));
--
2.36.0
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