1 files changed, 114 insertions, 0 deletions
diff --git a/src/stdio/__conv.c b/src/stdio/__conv.c
new file mode 100644
index 00000000..68d86d54
--- /dev/null
+++ b/src/stdio/__conv.c
@@ -0,0 +1,114 @@
+#include <inttypes.h>
+#include <ctype.h>
+#include <string.h>
+#include "_conversion.h"
+
+/*
+struct io_conversion {
+	enum { IO_IN, IO_OUT } dir;
+        enum {
+                F_STAR = (1<<0),
+                F_LEFT = (1<<1),
+                F_SIGN = (1<<2),
+                F_SPACE = (1<<3),
+                F_ALT = (1<<4),
+                F_ZERO = (1<<4),
+        } flags;
+        enum {
+                L_default,
+                L_hh,
+                L_h,
+                L_l,
+                L_ll,
+                L_j,
+                L_z,
+                L_t,
+                L_L,
+        } length;
+        int has_width:1;
+        int has_precision:1;
+        uintmax_t width;
+        uintmax_t precision;
+        char spec;
+};
+*/
+
+size_t __conv(const char *format, struct io_conversion *conv)
+{
+	size_t ret = 0;
+
+	if (format[0] != '%') {
+		return 0;
+	}
+
+	ret++;
+
+	conv->flags = 0;
+	conv->length = L_default;
+	conv->has_width = 0;
+	conv->has_precision = 0;
+
+	while (strchr("*-+ #0", format[ret])) {
+		switch (format[ret]) {
+		case '*':	conv->flags |= F_STAR; break;
+		case '-':	conv->flags |= F_LEFT; break;
+		case '+':	conv->flags |= F_SIGN; break;
+		case ' ':	conv->flags |= F_SPACE; break;
+		case '#':	conv->flags |= F_ALT; break;
+		case '0':	conv->flags |= F_ZERO; break;
+		}
+		/* check for invalid input flags (only * is allowed) */
+		ret++;
+	}
+
+	if (isdigit(format[ret])) {
+		char *end = NULL;
+		conv->has_width = 1;
+		conv->width = strtoumax(format + ret, &end, 10);
+		ret += (size_t)(end - (format + ret));
+	}
+
+	/* TODO: precision */
+
+	if (strchr("hljztL", format[ret])) {
+		switch (format[ret]) {
+		case 'h':
+			if (format[ret + 1] == 'h') {
+				ret++;
+				conv->length = L_hh;
+			} else {
+				conv->length = L_h;
+			}
+			break;
+		case 'l':
+			if (format[ret + 1] == 'l') {
+				ret++;
+				conv->length = L_ll;
+			} else {
+				conv->length = L_l;
+			}
+			break;
+		case 'j':
+			conv->length = L_j;
+			break;
+		case 'z':
+			conv->length = L_z;
+			break;
+		case 't':
+			conv->length = L_t;
+			break;
+		case 'L':
+			conv->length = L_L;
+			break;
+		default:
+			break;
+		}
+		ret++;
+	}
+
+	/* TODO: validate */
+
+	conv->spec = format[ret];
+	ret++;
+	return ret;
+}