1 files changed, 116 insertions, 0 deletions
diff --git a/src/lib/conv.c b/src/lib/conv.c
new file mode 100644
index 0000000..89d1786
--- /dev/null
+++ b/src/lib/conv.c
@@ -0,0 +1,116 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <def.h>
+#include <math.h>
+#include <mem.h>
+#include <str.h>
+
+static const char HTOA_TABLE[] = "0123456789ABCDEF";
+static const char ITOA_TABLE[] = "0123456789";
+
+int atoi(char *str)
+{
+	u32 s_str = strlen(str);
+	if (!s_str)
+		return 0;
+
+	u8 negative = 0;
+	if (str[0] == '-')
+		negative = 1;
+
+	u32 i = 0;
+	if (negative)
+		i++;
+
+	int ret = 0;
+	for (; i < s_str; i++) {
+		ret += (str[i] - '0') * pow(10, (int)((s_str - i) - 1));
+	}
+
+	if (negative)
+		ret *= -1;
+	return ret;
+}
+
+char *htoa(u32 n)
+{
+	char *ret = (char *)malloc(10);
+
+	int i = 0;
+	while (n) {
+		ret[i++] = HTOA_TABLE[n & 0xF];
+		n >>= 4;
+	}
+
+	if (!i) {
+		ret[0] = '0';
+		i++;
+	}
+
+	for (; i <= 9; i++)
+		ret[i] = 0;
+
+	char *aux = strdup(ret);
+	free(ret);
+	ret = aux;
+
+	strinv(ret);
+	return ret;
+}
+
+int htoi(char *str)
+{
+	u32 s_str = strlen(str);
+
+	u32 i = 0;
+	int ret = 0;
+	for (; i < s_str; i++) {
+		char c = str[i];
+		int aux = 0;
+		if (c >= '0' && c <= '9')
+			aux = c - '0';
+		else if (c >= 'A' && c <= 'F')
+			aux = (c - 'A') + 10;
+
+		ret += aux * pow(16, (int)((s_str - i) - 1));
+	}
+
+	return ret;
+}
+
+char *itoa(int n)
+{
+	if (!n) {
+		char *ret = (char *)malloc(2);
+		ret[0] = '0';
+		ret[1] = 0;
+		return ret;
+	}
+	u8 negative = (u8)(n < 0);
+	if (negative)
+		n *= -1;
+
+	int sz;
+	for (sz = 0; n % pow(10, sz) != n; sz++) {
+	}
+
+	char *ret = (char *)malloc((u32)(sz + 1));
+
+	for (int i = 0; i < sz; i++) {
+		int digit = (n % pow(10, i + 1)) / pow(10, i);
+		ret[i] = ITOA_TABLE[digit];
+	}
+	ret[sz] = 0;
+
+	if (negative) {
+		char *aux = (char *)malloc((u32)(sz + 2));
+		strcpy(aux, ret);
+		aux[sz] = '-';
+		aux[sz + 1] = 0;
+		free(ret);
+		ret = aux;
+	}
+
+	strinv(ret);
+	return ret;
+}