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feat(libc): add printf support for space padding

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This patch makes printf capable of padding strings with spaces
to their left, allowing right-aligning numeric values and strings.
It uses the same width field for the format specifier as in the
original libc function : %<width><type> (e.g.: %10d pads an
integer value with spaces to the left to complete 10 characters).

Change-Id: Ib7b5519dae17742181352ce58e507a05ba5250d4
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
This commit is contained in:
Juan Pablo Conde 2023-11-08 13:03:53 -06:00
parent e7486343d4
commit 0926d2df7a
1 changed files with 22 additions and 0 deletions
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22
lib/libc/printf.c
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@ -95,6 +95,7 @@ static int unsigned_num_print(unsigned long long int unum, unsigned int radix,
*
* The following padding specifiers are supported by this print
* %0NN - Left-pad the number with 0s (NN is a decimal number)
* %NN - Left-pad the number with spaces (NN is a decimal number)
*
* The print exits on all other formats specifiers other than valid
* combinations of the above specifiers.
@ -182,6 +183,27 @@ loop:
padn = 0;
fmt++;
for (;;) {
char ch = *fmt;
if ((ch < '0') || (ch > '9')) {
goto loop;
}
padn = (padn * 10) + (ch - '0');
fmt++;
}
assert(0); /* Unreachable */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
padc = ' ';
padn = 0;
for (;;) {
char ch = *fmt;
if ((ch < '0') || (ch > '9')) {