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feat(libc): add %X to printf/snprintf

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Enables printing captial hex chars as well as lowercase

Change-Id: I4dc48c3db97b908f0bb344d7765807967de8cf02
Signed-off-by: Matt Schulte <matsch@google.com>
This commit is contained in:
Matt Schulte 2023-07-13 11:10:32 -07:00
parent e318411f02
commit 483edc207a
1 changed files with 15 additions and 7 deletions
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22
lib/libc/printf.c
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@ -36,7 +36,7 @@ static int string_print(const char *str)
}
static int unsigned_num_print(unsigned long long int unum, unsigned int radix,
char padc, int padn)
char padc, int padn, bool uppercase)
{
/* Just need enough space to store 64 bit decimal integer */
char num_buf[20];
@ -51,10 +51,13 @@ static int unsigned_num_print(unsigned long long int unum, unsigned int radix,
do {
rem = unum % radix;
if (rem < 0xa)
if (rem < 0xa) {
num_buf[i] = '0' + rem;
else
} else if (uppercase) {
num_buf[i] = 'A' + (rem - 0xa);
} else {
num_buf[i] = 'a' + (rem - 0xa);
}
i++;
unum /= radix;
} while (unum > 0U);
@ -105,8 +108,10 @@ int vprintf(const char *fmt, va_list args)
char padc = '\0'; /* Padding character */
int padn; /* Number of characters to pad */
int count = 0; /* Number of printed characters */
bool uppercase; /* Print characters in uppercase */
while (*fmt != '\0') {
uppercase = false;
l_count = 0;
padn = 0;
@ -129,7 +134,7 @@ loop:
unum = (unsigned long long int)num;
count += unsigned_num_print(unum, 10,
padc, padn);
padc, padn, uppercase);
break;
case 'c':
(void)putchar(va_arg(args, int));
@ -147,12 +152,15 @@ loop:
}
count += unsigned_num_print(unum, 16,
padc, padn);
padc, padn, uppercase);
break;
case 'X':
uppercase = true;
// fall through
case 'x':
unum = get_unum_va_args(args, l_count);
count += unsigned_num_print(unum, 16,
padc, padn);
padc, padn, uppercase);
break;
case 'z':
if (sizeof(size_t) == 8U)
@ -167,7 +175,7 @@ loop:
case 'u':
unum = get_unum_va_args(args, l_count);
count += unsigned_num_print(unum, 10,
padc, padn);
padc, padn, uppercase);
break;
case '0':
padc = '0';