working userland with some invoke syscalls

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/itoa.c b/lib/itoa.c
new file mode 100644
index 0000000..57f0c22
--- /dev/null
+++ b/lib/itoa.c
@@ -0,0 +1,32 @@
+#include "string.h"
+
+int
+ltostr(char *s, int size, unsigned long l, bool sign, int radix)
+{
+    unsigned wsize = 0;
+    unsigned digits = 0;
+    if((long)l < 0 && sign) {
+        l = -((long)l);
+        if(size > wsize && s != 0) s[wsize] = '-';
+        wsize++;
+    }
+
+    for(unsigned long lv = l; lv != 0; lv /= radix) {
+        digits++;
+    }
+
+    if(digits-- == 0) {
+        if(size > wsize && s != 0) s[wsize] = '0';
+        wsize++;
+    }
+
+    for(unsigned long lv = l; lv != 0; lv /= radix) {
+        int digit = lv % radix;
+        if(size > digits - wsize && s != 0) {
+            s[digits - wsize] = (digit >= 10 ? (digit + 'a' - 10) : digit + '0');
+        }
+        wsize++;
+    }
+    if(size > wsize && s != 0) s[wsize] = 0;
+    return ++wsize;
+}