Split mg_*printf* functions into src/printf.c/h

src/fmt.c

@@ -2,65 +2,6 @@
 #include "iobuf.h"
 #include "util.h"
 
-static void mg_pfn_iobuf_private(char ch, void *param, bool expand) {
-  struct mg_iobuf *io = (struct mg_iobuf *) param;
-  if (expand && io->len + 2 > io->size) mg_iobuf_resize(io, io->len + 2);
-  if (io->len + 2 <= io->size) {
-    io->buf[io->len++] = (uint8_t) ch;
-    io->buf[io->len] = 0;
-  } else if (io->len < io->size) {
-    io->buf[io->len++] = 0;  // Guarantee to 0-terminate
-  }
-}
-
-static void mg_putchar_iobuf_static(char ch, void *param) {
-  mg_pfn_iobuf_private(ch, param, false);
-}
-
-void mg_pfn_iobuf(char ch, void *param) {
-  mg_pfn_iobuf_private(ch, param, true);
-}
-
-size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap) {
-  struct mg_iobuf io = {(uint8_t *) buf, len, 0, 0};
-  size_t n = mg_vxprintf(mg_putchar_iobuf_static, &io, fmt, ap);
-  if (n < len) buf[n] = '\0';
-  return n;
-}
-
-size_t mg_snprintf(char *buf, size_t len, const char *fmt, ...) {
-  va_list ap;
-  size_t n;
-  va_start(ap, fmt);
-  n = mg_vsnprintf(buf, len, fmt, &ap);
-  va_end(ap);
-  return n;
-}
-
-char *mg_vmprintf(const char *fmt, va_list *ap) {
-  struct mg_iobuf io = {0, 0, 0, 256};
-  mg_vxprintf(mg_pfn_iobuf, &io, fmt, ap);
-  return (char *) io.buf;
-}
-
-char *mg_mprintf(const char *fmt, ...) {
-  char *s;
-  va_list ap;
-  va_start(ap, fmt);
-  s = mg_vmprintf(fmt, &ap);
-  va_end(ap);
-  return s;
-}
-
-size_t mg_xprintf(void (*out)(char, void *), void *ptr, const char *fmt, ...) {
-  size_t len = 0;
-  va_list ap;
-  va_start(ap, fmt);
-  len = mg_vxprintf(out, ptr, fmt, &ap);
-  va_end(ap);
-  return len;
-}
-
 static bool is_digit(int c) {
   return c >= '0' && c <= '9';
 }
@@ -237,6 +178,15 @@ static size_t bcpy(void (*out)(char, void *), void *ptr, uint8_t *buf,
   return n;
 }
 
+size_t mg_xprintf(void (*out)(char, void *), void *ptr, const char *fmt, ...) {
+  size_t len = 0;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vxprintf(out, ptr, fmt, &ap);
+  va_end(ap);
+  return len;
+}
+
 size_t mg_vxprintf(void (*out)(char, void *), void *param, const char *fmt,
                    va_list *ap) {
   size_t i = 0, n = 0;