[U-Boot] [PATCH 4/5] efi_selftest: support printing leading zeroes

[Heinrich Schuchardt]

Allow specifying the precision when printing integers, e.g.

efi_st_printf("%.4u-%.2u-%.2u\n", year, month, day);

Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
 lib/efi_selftest/efi_selftest_console.c | 33 ++++++++++++++++---------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/lib/efi_selftest/efi_selftest_console.c 
b/lib/efi_selftest/efi_selftest_console.c
index c3655a1fcc..eb139c127c 100644
--- a/lib/efi_selftest/efi_selftest_console.c
+++ b/lib/efi_selftest/efi_selftest_console.c
@@ -70,11 +70,12 @@ static void pointer(void *pointer, u16 **buf)
 /*
  * Print an unsigned 32bit value as decimal number to an u16 string
  *
- * @value: value to be printed
- * @buf: pointer to buffer address
- * on return position of terminating zero word
+ * @value:     value to be printed
+ * @prec:      minimum number of digits to display
+ * @buf:       pointer to buffer address
+ *             on return position of terminating zero word
  */
-static void uint2dec(u32 value, u16 **buf)
+static void uint2dec(u32 value, int prec, u16 **buf)
 {
        u16 *pos = *buf;
        int i;
@@ -93,7 +94,7 @@ static void uint2dec(u32 value, u16 **buf)
        for (i = 0; i < 10; ++i) {
                /* Write current digit */
                c = f >> 60;
-               if (c || pos != *buf)
+               if (c || pos != *buf || 10 - i <= prec)
                        *pos++ = c + '0';
                /* Eliminate current digit */
                f &= 0xfffffffffffffff;
@@ -109,11 +110,12 @@ static void uint2dec(u32 value, u16 **buf)
 /*
  * Print a signed 32bit value as decimal number to an u16 string
  *
- * @value: value to be printed
- * @buf: pointer to buffer address
+ * @value:     value to be printed
+ * @prec:      minimum number of digits to display
+ * @buf:       pointer to buffer address
  * on return position of terminating zero word
  */
-static void int2dec(s32 value, u16 **buf)
+static void int2dec(s32 value, int prec, u16 **buf)
 {
        u32 u;
        u16 *pos = *buf;
@@ -124,7 +126,7 @@ static void int2dec(s32 value, u16 **buf)
        } else {
                u = value;
        }
-       uint2dec(u, &pos);
+       uint2dec(u, prec, &pos);
        *buf = pos;
 }
 
@@ -143,6 +145,7 @@ void efi_st_printc(int color, const char *fmt, ...)
        u16 *pos = buf;
        const char *s;
        u16 *u;
+       int prec;
 
        va_start(args, fmt);
 
@@ -172,12 +175,20 @@ void efi_st_printc(int color, const char *fmt, ...)
                        break;
                case '%':
                        ++c;
+                       /* Parse precision */
+                       if (*c == '.') {
+                               ++c;
+                               prec = *c - '0';
+                               ++c;
+                       } else {
+                               prec = 0;
+                       }
                        switch (*c) {
                        case '\0':
                                --c;
                                break;
                        case 'd':
-                               int2dec(va_arg(args, s32), &pos);
+                               int2dec(va_arg(args, s32), prec, &pos);
                                break;
                        case 'p':
                                ++c;
@@ -209,7 +220,7 @@ void efi_st_printc(int color, const char *fmt, ...)
                                        *pos++ = *s;
                                break;
                        case 'u':
-                               uint2dec(va_arg(args, u32), &pos);
+                               uint2dec(va_arg(args, u32), prec, &pos);
                                break;
                        default:
                                break;
-- 
2.18.0

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