break apart c libaray

1 files changed, 31 insertions, 0 deletions

diff --git a/kernel/lib/xtoa.c b/kernel/lib/xtoa.c
new file mode 100644
index 0000000..bd3a367
--- /dev/null
+++ b/kernel/lib/xtoa.c
@@ -0,0 +1,31 @@
+#include <lib.h>
+
+#define XTOA(type, name)                        \
+	char *name(type n, char *buffer, int radix) \
+	{                                           \
+		if (n == 0) {                           \
+			buffer[0] = '0';                    \
+			buffer[1] = '\0';                   \
+			return buffer + 1;                  \
+		}                                       \
+		if (n < 0) {                            \
+			*buffer++ = '-';                    \
+			n = -n;                             \
+		}                                       \
+		char *start = buffer;                   \
+		for (; n; n /= radix) {                 \
+			*buffer++ = itoc(n % radix);        \
+		}                                       \
+		char *buf_end = buffer;                 \
+		*buffer-- = '\0';                       \
+		while (buffer > start) {                \
+			char tmp = *start;                  \
+			*start++ = *buffer;                 \
+			*buffer-- = tmp;                    \
+		}                                       \
+		return buf_end;                         \
+	}
+
+XTOA(int, itoa)
+XTOA(long int, ltoa)
+XTOA(long long int, lltoa)