diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 288bc968..c2a5a6ad 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,7 +25,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: ./test/setup_ga_network.sh
     - if: steps.check.outputs.MATCH == 1
@@ -38,7 +38,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: sudo apt-get update && sudo apt-get install qemu binfmt-support qemu-user-static
     - if: steps.check.outputs.MATCH == 1
@@ -51,7 +51,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: sudo apt-get update && sudo apt-get install qemu binfmt-support qemu-user-static
     - if: steps.check.outputs.MATCH == 1
@@ -64,7 +64,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: sudo apt-get update ; sudo apt-get install libmbedtls-dev valgrind
     - if: steps.check.outputs.MATCH == 1
@@ -86,7 +86,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: HOMEBREW_NO_AUTO_UPDATE=1 brew install jq mbedtls openssl
     - if: steps.check.outputs.MATCH == 1
@@ -102,7 +102,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^test|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^test|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: make vc98 vc17 vc22 mingw mingw++
   arduino-xiao:
@@ -111,7 +111,7 @@ jobs:
     - uses: actions/checkout@v3
       with: { fetch-depth: 2 }
     - id: check
-      run: /bin/bash test/check.sh '^examples/arduino|^src/*.[ch]'
+      run: /bin/bash test/check.sh '^examples/arduino|^src/.*.[ch]'
     - if: steps.check.outputs.MATCH == 1
       run: make arduino-xiao
   arm:
@@ -193,7 +193,7 @@ jobs:
       - uses: actions/checkout@v3
         with: { fetch-depth: 2 }
       - id: check
-        run: /bin/bash test/check.sh '^examples/zephyr|^src/*.[ch]'
+        run: /bin/bash test/check.sh '^examples/zephyr|^src/.*.[ch]'
       - if: steps.check.outputs.MATCH == 1
         run: make -C examples/zephyr init
       - name: minify manifest
diff --git a/mongoose.c b/mongoose.c
index 3ed21ec5..45891923 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -411,65 +411,6 @@ void mg_error(struct mg_connection *c, const char *fmt, ...) {
 
 
 
-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';
 }
@@ -646,6 +587,15 @@ 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;
@@ -2748,13 +2698,8 @@ long mg_json_get_long(struct mg_str json, const char *path, long dflt) {
 
 
 
-static void default_logger(char c, void *param) {
-  putchar(c);
-  (void) c, (void) param;
-}
-
 static int s_level = MG_LL_INFO;
-static mg_pfn_t s_log_func = default_logger;
+static mg_pfn_t s_log_func = mg_pfn_stdout;
 static void *s_log_func_param = NULL;
 
 void mg_log_set_fn(mg_pfn_t fn, void *param) {
@@ -3537,6 +3482,107 @@ void mg_mgr_init(struct mg_mgr *mgr) {
   mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
 }
 
+#ifdef MG_ENABLE_LINES
+#line 1 "src/printf.c"
+#endif
+
+
+
+
+
+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;
+}
+
+void mg_pfn_stdout(char c, void *param) {
+  putchar(c);
+  (void) param;
+}
+
+static size_t print_ip4(void (*out)(char, void *), void *arg, uint8_t *p) {
+  return mg_xprintf(out, arg, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+}
+
+static size_t print_ip6(void (*out)(char, void *), void *arg, uint16_t *p) {
+  return mg_xprintf(out, arg, "[%x:%x:%x:%x:%x:%x:%x:%x]", mg_ntohs(p[0]),
+                    mg_ntohs(p[1]), mg_ntohs(p[2]), mg_ntohs(p[3]),
+                    mg_ntohs(p[4]), mg_ntohs(p[5]), mg_ntohs(p[6]),
+                    mg_ntohs(p[7]));
+}
+
+size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint8_t *p = va_arg(*ap, uint8_t *);
+  return print_ip4(out, arg, p);
+}
+
+size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint16_t *p = va_arg(*ap, uint16_t *);
+  return print_ip6(out, arg, p);
+}
+
+size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap) {
+  struct mg_addr *addr = va_arg(*ap, struct mg_addr *);
+  if (addr->is_ip6) return print_ip6(out, arg, (uint16_t *) addr->ip6);
+  return print_ip4(out, arg, (uint8_t *) &addr->ip);
+}
+
+size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap) {
+  struct mg_addr *a = va_arg(*ap, struct mg_addr *);
+  return mg_xprintf(out, arg, "%M:%hu", mg_print_ip, a, mg_ntohs(a->port));
+}
+
+size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint8_t *p = va_arg(*ap, uint8_t *);
+  return mg_xprintf(out, arg, "%02x:%02x:%02x:%02x:%02x:%02x", p[0], p[1], p[2],
+                    p[3], p[4], p[5]);
+}
+
 #ifdef MG_ENABLE_LINES
 #line 1 "src/rpc.c"
 #endif
@@ -5552,44 +5598,6 @@ int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
   return allowed == '+';
 }
 
-static size_t print_ip4(void (*out)(char, void *), void *arg, uint8_t *p) {
-    return mg_xprintf(out, arg, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
-}
-
-static size_t print_ip6(void (*out)(char, void *), void *arg, uint16_t *p) {
-    return mg_xprintf(out, arg, "[%x:%x:%x:%x:%x:%x:%x:%x]", mg_ntohs(p[0]),
-                      mg_ntohs(p[1]), mg_ntohs(p[2]), mg_ntohs(p[3]),
-                      mg_ntohs(p[4]), mg_ntohs(p[5]), mg_ntohs(p[6]),
-                      mg_ntohs(p[7]));
-}
-
-size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint8_t *p = va_arg(*ap, uint8_t *);
-  return print_ip4(out, arg, p);
-}
-
-size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint16_t *p = va_arg(*ap, uint16_t *);
-  return print_ip6(out, arg, p);
-}
-
-size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap) {
-  struct mg_addr *addr = va_arg(*ap, struct mg_addr *);
-  if (addr->is_ip6) return print_ip6(out, arg, (uint16_t *) addr->ip6);
-  return print_ip4(out, arg, (uint8_t *) &addr->ip);
-}
-
-size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap) {
-  struct mg_addr *a = va_arg(*ap, struct mg_addr *);
-  return mg_xprintf(out, arg, "%M:%hu", mg_print_ip, a, mg_ntohs(a->port));
-}
-
-size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint8_t *p = va_arg(*ap, uint8_t *);
-  return mg_xprintf(out, arg, "%02x:%02x:%02x:%02x:%02x:%02x", p[0], p[1], p[2],
-                    p[3], p[4], p[5]);
-}
-
 #if MG_ENABLE_CUSTOM_MILLIS
 #else
 uint64_t mg_millis(void) {
diff --git a/mongoose.h b/mongoose.h
index ed9af8dc..4ea28615 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -787,17 +787,32 @@ char *mg_remove_double_dots(char *s);
 
 
 
-typedef void (*mg_pfn_t)(char, void *);                  // Custom putchar
+typedef void (*mg_pfn_t)(char, void *);                  // Output function
 typedef size_t (*mg_pm_t)(mg_pfn_t, void *, va_list *);  // %M printer
-void mg_pfn_iobuf(char ch, void *param);                 // iobuf printer
 
 size_t mg_vxprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
 size_t mg_xprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
+
+
+
+// Convenience wrappers around mg_xprintf
 size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap);
 size_t mg_snprintf(char *, size_t, const char *fmt, ...);
 char *mg_vmprintf(const char *fmt, va_list *ap);
 char *mg_mprintf(const char *fmt, ...);
 
+// %M print helper functions
+size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap);
+
+// Various output functions
+void mg_pfn_iobuf(char ch, void *param);  // param: struct mg_iobuf *
+void mg_pfn_queue(char ch, void *param);  // param: struct mg_queue *
+void mg_pfn_stdout(char c, void *param);  // param: ignored
+
 
 
 
@@ -918,12 +933,6 @@ uint64_t mg_millis(void);
 #define MG_IPADDR_PARTS(ADDR) \
   MG_U8P(ADDR)[0], MG_U8P(ADDR)[1], MG_U8P(ADDR)[2], MG_U8P(ADDR)[3]
 
-size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap);
-
 // Linked list management macros
 #define LIST_ADD_HEAD(type_, head_, elem_) \
   do {                                     \
diff --git a/src/fmt.c b/src/fmt.c
index a66231e1..c14c21f2 100644
--- a/src/fmt.c
+++ b/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;
diff --git a/src/fmt.h b/src/fmt.h
index db3b6fa1..7a217e8b 100644
--- a/src/fmt.h
+++ b/src/fmt.h
@@ -3,13 +3,26 @@
 #include "arch.h"
 #include "iobuf.h"
 
-typedef void (*mg_pfn_t)(char, void *);                  // Custom putchar
+typedef void (*mg_pfn_t)(char, void *);                  // Output function
 typedef size_t (*mg_pm_t)(mg_pfn_t, void *, va_list *);  // %M printer
-void mg_pfn_iobuf(char ch, void *param);                 // iobuf printer
 
+// The lowest level
 size_t mg_vxprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
 size_t mg_xprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
+
+// Convenience wrappers around mg_xprintf
 size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap);
 size_t mg_snprintf(char *, size_t, const char *fmt, ...);
 char *mg_vmprintf(const char *fmt, va_list *ap);
 char *mg_mprintf(const char *fmt, ...);
+
+// %M print helper functions
+size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap);
+size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap);
+
+// Various output functions
+void mg_pfn_iobuf(char ch, void *param);  // param: struct mg_iobuf *
+void mg_pfn_stdout(char c, void *param);  // param: ignored
diff --git a/src/log.c b/src/log.c
index 72f32bad..79a0c2c0 100644
--- a/src/log.c
+++ b/src/log.c
@@ -1,15 +1,10 @@
 #include "log.h"
-#include "fmt.h"
+#include "printf.h"
 #include "str.h"
 #include "util.h"
 
-static void default_logger(char c, void *param) {
-  putchar(c);
-  (void) c, (void) param;
-}
-
 static int s_level = MG_LL_INFO;
-static mg_pfn_t s_log_func = default_logger;
+static mg_pfn_t s_log_func = mg_pfn_stdout;
 static void *s_log_func_param = NULL;
 
 void mg_log_set_fn(mg_pfn_t fn, void *param) {
diff --git a/src/printf.c b/src/printf.c
new file mode 100644
index 00000000..a4de5153
--- /dev/null
+++ b/src/printf.c
@@ -0,0 +1,96 @@
+#include "fmt.h"
+#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;
+}
+
+void mg_pfn_stdout(char c, void *param) {
+  putchar(c);
+  (void) param;
+}
+
+static size_t print_ip4(void (*out)(char, void *), void *arg, uint8_t *p) {
+  return mg_xprintf(out, arg, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+}
+
+static size_t print_ip6(void (*out)(char, void *), void *arg, uint16_t *p) {
+  return mg_xprintf(out, arg, "[%x:%x:%x:%x:%x:%x:%x:%x]", mg_ntohs(p[0]),
+                    mg_ntohs(p[1]), mg_ntohs(p[2]), mg_ntohs(p[3]),
+                    mg_ntohs(p[4]), mg_ntohs(p[5]), mg_ntohs(p[6]),
+                    mg_ntohs(p[7]));
+}
+
+size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint8_t *p = va_arg(*ap, uint8_t *);
+  return print_ip4(out, arg, p);
+}
+
+size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint16_t *p = va_arg(*ap, uint16_t *);
+  return print_ip6(out, arg, p);
+}
+
+size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap) {
+  struct mg_addr *addr = va_arg(*ap, struct mg_addr *);
+  if (addr->is_ip6) return print_ip6(out, arg, (uint16_t *) addr->ip6);
+  return print_ip4(out, arg, (uint8_t *) &addr->ip);
+}
+
+size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap) {
+  struct mg_addr *a = va_arg(*ap, struct mg_addr *);
+  return mg_xprintf(out, arg, "%M:%hu", mg_print_ip, a, mg_ntohs(a->port));
+}
+
+size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap) {
+  uint8_t *p = va_arg(*ap, uint8_t *);
+  return mg_xprintf(out, arg, "%02x:%02x:%02x:%02x:%02x:%02x", p[0], p[1], p[2],
+                    p[3], p[4], p[5]);
+}
diff --git a/src/util.c b/src/util.c
index 9b7940a3..6f7f5c0c 100644
--- a/src/util.c
+++ b/src/util.c
@@ -87,44 +87,6 @@ int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
   return allowed == '+';
 }
 
-static size_t print_ip4(void (*out)(char, void *), void *arg, uint8_t *p) {
-    return mg_xprintf(out, arg, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
-}
-
-static size_t print_ip6(void (*out)(char, void *), void *arg, uint16_t *p) {
-    return mg_xprintf(out, arg, "[%x:%x:%x:%x:%x:%x:%x:%x]", mg_ntohs(p[0]),
-                      mg_ntohs(p[1]), mg_ntohs(p[2]), mg_ntohs(p[3]),
-                      mg_ntohs(p[4]), mg_ntohs(p[5]), mg_ntohs(p[6]),
-                      mg_ntohs(p[7]));
-}
-
-size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint8_t *p = va_arg(*ap, uint8_t *);
-  return print_ip4(out, arg, p);
-}
-
-size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint16_t *p = va_arg(*ap, uint16_t *);
-  return print_ip6(out, arg, p);
-}
-
-size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap) {
-  struct mg_addr *addr = va_arg(*ap, struct mg_addr *);
-  if (addr->is_ip6) return print_ip6(out, arg, (uint16_t *) addr->ip6);
-  return print_ip4(out, arg, (uint8_t *) &addr->ip);
-}
-
-size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap) {
-  struct mg_addr *a = va_arg(*ap, struct mg_addr *);
-  return mg_xprintf(out, arg, "%M:%hu", mg_print_ip, a, mg_ntohs(a->port));
-}
-
-size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap) {
-  uint8_t *p = va_arg(*ap, uint8_t *);
-  return mg_xprintf(out, arg, "%02x:%02x:%02x:%02x:%02x:%02x", p[0], p[1], p[2],
-                    p[3], p[4], p[5]);
-}
-
 #if MG_ENABLE_CUSTOM_MILLIS
 #else
 uint64_t mg_millis(void) {
diff --git a/src/util.h b/src/util.h
index 9c0f7539..4b5cc696 100644
--- a/src/util.h
+++ b/src/util.h
@@ -25,12 +25,6 @@ uint64_t mg_millis(void);
 #define MG_IPADDR_PARTS(ADDR) \
   MG_U8P(ADDR)[0], MG_U8P(ADDR)[1], MG_U8P(ADDR)[2], MG_U8P(ADDR)[3]
 
-size_t mg_print_ip(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip_port(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip4(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_ip6(void (*out)(char, void *), void *arg, va_list *ap);
-size_t mg_print_mac(void (*out)(char, void *), void *arg, va_list *ap);
-
 // Linked list management macros
 #define LIST_ADD_HEAD(type_, head_, elem_) \
   do {                                     \
diff --git a/test/check.sh b/test/check.sh
index 43d58aa8..a46bd0b7 100644
--- a/test/check.sh
+++ b/test/check.sh
@@ -20,11 +20,11 @@
 # MATCH=1. If no files match, write MATCH=0.
 for FILE in $(git --no-pager diff --name-only HEAD~1 HEAD) ; do
   if [[ "$FILE" =~ $1 ]] ; then
-    echo FILE "$FILE" matches $1        # Log for debugging
-    echo MATCH=1 >> $GITHUB_OUTPUT
-    exit 0                              # And exit early
+    echo FILE "$FILE" matches "$1"    # Log for debugging
+    echo MATCH=1 >> $GITHUB_OUTPUT    # Set output
+    exit 0                            # And exit early
   else
-    echo FILE "$FILE" DOES NOT match $1        # Log for debugging
+    echo FILE "$FILE" DOES NOT match "$1"  # Log for debugging
   fi
 done
 echo MATCH=0 >> $GITHUB_OUTPUT