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libc: support precision for %d?

This commit is contained in:
K. Lange 2020-04-30 19:02:28 +09:00
parent 888323bcea
commit 1bbf9fba5d
1 changed files with 8 additions and 5 deletions
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13
libc/stdio/printf.c
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@ -2,9 +2,10 @@
#include <string.h>
#include <va_list.h>
static void print_dec(unsigned int value, unsigned int width, char * buf, int * ptr, int fill_zero, int align_right) {
static void print_dec(unsigned int value, unsigned int width, char * buf, int * ptr, int fill_zero, int align_right, int precision) {
unsigned int n_width = 1;
unsigned int i = 9;
if (precision == -1) precision = 1;
if (value < 10UL) {
n_width = 1;
@ -28,6 +29,8 @@ static void print_dec(unsigned int value, unsigned int width, char * buf, int *
n_width = 10;
}
if (n_width < (unsigned int)precision) n_width = precision;
int printed = 0;
if (align_right) {
while (n_width + printed < width) {
@ -248,7 +251,7 @@ int xvasprintf(char * buf, const char * fmt, va_list args) {
*b++ = '+';
buf++;
}
print_dec(val, arg_width, buf, &i, fill_zero, align);
print_dec(val, arg_width, buf, &i, fill_zero, align, precision);
}
b = buf + i;
break;
@ -261,7 +264,7 @@ int xvasprintf(char * buf, const char * fmt, va_list args) {
} else {
val = (unsigned long)va_arg(args, unsigned long);
}
print_dec(val, arg_width, buf, &i, fill_zero, align);
print_dec(val, arg_width, buf, &i, fill_zero, align, precision);
}
b = buf + i;
break;
@ -275,7 +278,7 @@ int xvasprintf(char * buf, const char * fmt, va_list args) {
buf++;
val = -val;
}
print_dec((long)val, arg_width, buf, &i, fill_zero, align);
print_dec((long)val, arg_width, buf, &i, fill_zero, align, 1);
b = buf + i;
i = b - buf;
*b++ = '.';
@ -283,7 +286,7 @@ int xvasprintf(char * buf, const char * fmt, va_list args) {
for (int j = 0; j < ((precision > -1 && precision < 8) ? precision : 8); ++j) {
if ((int)(val * 100000.0) % 100000 == 0 && j != 0) break;
val *= 10.0;
print_dec((int)(val) % 10, 0, buf, &i, 0, 0);
print_dec((int)(val) % 10, 0, buf, &i, 0, 0, 1);
}
b = buf + i;
}