diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/stdio.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/libc/stdio.c b/libc/stdio.c index 4888338..17c5a2f 100644 --- a/libc/stdio.c +++ b/libc/stdio.c @@ -14,6 +14,21 @@ int puts(const char* str) return 0; } +static char hex_table[16] = { '0', '1', '2', '3', '4', '5', '6', '7', + '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; + +static void print_hex(unsigned int n) +{ + unsigned mask = 0xF0000000; + unsigned shift = 28; + while(mask) + { + putchar(hex_table[(n & mask) >> shift]); + mask >>= 4; + shift -= 4; + } +} + int printf(const char *fmt, ...) { va_list ap; @@ -33,6 +48,9 @@ int printf(const char *fmt, ...) case 's': puts(va_arg(ap, const char*)); break; + case 'x': + print_hex(va_arg(ap, unsigned)); + break; default: puts("printf: unknown format\n"); break; |