diff options
Diffstat (limited to 'src/init/stdlib.c')
| -rw-r--r-- | src/init/stdlib.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/init/stdlib.c b/src/init/stdlib.c index 18da3da..e8b3f97 100644 --- a/src/init/stdlib.c +++ b/src/init/stdlib.c @@ -21,8 +21,20 @@ int printf(const char *fmt, ...) { case '%': _syscall_write(0, seg, fmt - seg - 1, 0); total += fmt - seg - 1; + size_t pad_len = 0; +parse_fmt: c = *fmt++; switch (c) { + case '0': + pad_len = *fmt++ - '0'; // can skip over the null byte, idc + goto parse_fmt; + + case 'c': + char c = va_arg(argp, int); + _syscall_write(0, &c, 1, 0); + total += 1; + break; + case 's': const char *s = va_arg(argp, char*); if (s) { @@ -37,6 +49,9 @@ int printf(const char *fmt, ...) { while (n >> i && i < (sizeof(int) * 8)) i += 4; + if (i < pad_len * 4) + i = pad_len * 4; + while (i > 0) { i -= 4; char h = '0' + ((n >> i) & 0xf); |