1 files changed, 73 insertions, 0 deletions
diff --git a/include/base/fmt.h b/include/base/fmt.h
new file mode 100644
index 0000000..4c187fd
--- /dev/null
+++ b/include/base/fmt.h
@@ -0,0 +1,73 @@
+#pragma once
+
+typedef struct fmt·State fmt·State;
+
+struct fmt·State
+{
+    struct{
+        char *beg;
+        char *cur;
+        char *end;
+    } buffer;
+    int n;
+
+    va_list args;
+    rune  verb;
+    ulong flag;
+    int  width;
+    int  prec;
+    char *thousands, *groups, *decimal;
+
+    void *file;
+    int (*flush)(fmt·State *);
+    struct {
+        void *heap;
+        mem·Reallocator mem;
+    };
+};
+
+#define iota(x) (1 << (x))
+enum
+{
+    fmt·Width    = iota(0),
+    fmt·Left     = iota(1),
+    fmt·Prec     = iota(2),
+    fmt·Sharp    = iota(3),
+    fmt·Space    = iota(4),
+    fmt·Sign     = iota(5),
+    fmt·Apost    = iota(6),
+    fmt·Zero     = iota(7),
+    fmt·Unsigned = iota(8),
+    fmt·Short    = iota(9),
+    fmt·Long     = iota(10),
+    fmt·Vlong    = iota(11),
+    fmt·Comma    = iota(12),
+    fmt·Byte     = iota(13),
+    fmt·Ldouble  = iota(14),
+    fmt·Flag     = iota(15),
+};
+#undef iota
+
+/* normal printing interface */
+int   fmt·print(char *fmt, ...);
+int   fmt·fprint(int fd, char *fmt, ...);
+void  fmt·panic(char *fmt, ...);
+
+int   fmt·sprint(char *buf, char *fmt, ...);
+int   fmt·nsprint(int len, char *buf, char *fmt, ...);
+char *fmt·esprint(char *buf, char *end, char *fmt, ...);
+
+int   fmt·vprint(char *fmt, va_list args);
+int   fmt·vfprint(int fd, char *fmt, va_list args);
+int   fmt·vnsprint(int len, char *buf, char *fmt, va_list args);
+char *fmt·vesprint(char *buf, char *end, char *fmt, va_list args);
+
+/* low-level interface: used for custom printing verbs */
+int   fmt·open(int fd, int len, char *buf, fmt·State *);    // creates a buffer on a file
+int   fmt·make(mem·Reallocator mem, void *heap, fmt·State *); // creates an in-memory buffer
+void  fmt·free(fmt·State *); // releases an in-memory buffer
+
+int   fmt·do(fmt·State *, char *fmt);
+int   fmt·write(fmt·State *, char *fmt, ...);
+int   fmt·vwrite(fmt·State *, char *fmt, va_list args);
+int   fmt·install(int c, int (*format)(fmt·State *));