From f2009ebd62a603c9096b3b6b300e55b78630b730 Mon Sep 17 00:00:00 2001
From: Sergey Lyubka <valenok@gmail.com>
Date: Thu, 28 Jul 2022 10:18:17 +0100
Subject: [PATCH] Move mg_*printf* decls in fmt.h

---
 Makefile        |   2 +-
 mongoose.c      | 297 ++++++++++++++++++++++++------------------------
 mongoose.h      |  12 +-
 src/dbl.c       | 135 ----------------------
 src/event.c     |   2 +-
 src/fmt.c       | 145 ++++++++++++++++++++++-
 src/fmt.h       |  22 ++++
 src/fs.c        |   2 +-
 src/fs_packed.c |   1 +
 src/http.c      |   1 +
 src/json.c      |   1 +
 src/log.c       |   2 +
 src/net.c       |   2 +-
 src/rpc.h       |   1 +
 src/ssi.c       |   2 +-
 src/str.c       |   9 --
 src/str.h       |  17 ---
 src/ws.c        |   1 +
 18 files changed, 336 insertions(+), 318 deletions(-)
 delete mode 100644 src/dbl.c
 create mode 100644 src/fmt.h

diff --git a/Makefile b/Makefile
index 2fbec80e..5c62c54e 100644
--- a/Makefile
+++ b/Makefile
@@ -156,7 +156,7 @@ mongoose.c: Makefile $(wildcard src/*) $(wildcard mip/*.c)
 	(cat src/license.h; echo; echo '#include "mongoose.h"' ; (for F in src/*.c mip/*.c ; do echo; echo '#ifdef MG_ENABLE_LINES'; echo "#line 1 \"$$F\""; echo '#endif'; cat $$F | sed -e 's,#include ".*,,'; done))> $@
 
 mongoose.h: $(HDRS) Makefile
-	(cat src/license.h; echo; echo '#ifndef MONGOOSE_H'; echo '#define MONGOOSE_H'; echo; cat src/version.h ; echo; echo '#ifdef __cplusplus'; echo 'extern "C" {'; echo '#endif'; cat src/arch.h src/arch_*.h src/config.h src/str.h src/log.h src/timer.h src/fs.h src/util.h src/url.h src/iobuf.h src/base64.h src/md5.h src/sha1.h src/event.h src/net.h src/http.h src/ssi.h src/tls.h src/tls_mbed.h src/tls_openssl.h src/ws.h src/sntp.h src/mqtt.h src/dns.h src/json.h src/rpc.h mip/mip.h | sed -e 's,#include ".*,,' -e 's,^#pragma once,,'; echo; echo '#ifdef __cplusplus'; echo '}'; echo '#endif'; echo '#endif  // MONGOOSE_H')> $@
+	(cat src/license.h; echo; echo '#ifndef MONGOOSE_H'; echo '#define MONGOOSE_H'; echo; cat src/version.h ; echo; echo '#ifdef __cplusplus'; echo 'extern "C" {'; echo '#endif'; cat src/arch.h src/arch_*.h src/config.h src/str.h src/fmt.h src/log.h src/timer.h src/fs.h src/util.h src/url.h src/iobuf.h src/base64.h src/md5.h src/sha1.h src/event.h src/net.h src/http.h src/ssi.h src/tls.h src/tls_mbed.h src/tls_openssl.h src/ws.h src/sntp.h src/mqtt.h src/dns.h src/json.h src/rpc.h mip/mip.h | sed -e 's,#include ".*,,' -e 's,^#pragma once,,'; echo; echo '#ifdef __cplusplus'; echo '}'; echo '#endif'; echo '#endif  // MONGOOSE_H')> $@
 
 clean:
 	rm -rf $(PROG) *.exe *.o *.dSYM unit_test* valgrind_unit_test* ut fuzzer *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb slow-unit* _CL_* infer-out data.txt crash-* test/packed_fs.c pack unpacked
diff --git a/mongoose.c b/mongoose.c
index bc9837aa..38002ca0 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -107,145 +107,6 @@ int mg_base64_decode(const char *src, int n, char *dst) {
   return len;
 }
 
-#ifdef MG_ENABLE_LINES
-#line 1 "src/dbl.c"
-#endif
-
-
-double mg_atod(const char *p, int len, int *numlen) {
-  double d = 0.0;
-  int i = 0, sign = 1;
-
-  // Sign
-  if (i < len && *p == '-') {
-    sign = -1, i++;
-  } else if (i < len && *p == '+') {
-    i++;
-  }
-
-  // Decimal
-  for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
-    d *= 10.0;
-    d += p[i] - '0';
-  }
-  d *= sign;
-
-  // Fractional
-  if (i < len && p[i] == '.') {
-    double frac = 0.0, base = 0.1;
-    i++;
-    for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
-      frac += base * (p[i] - '0');
-      base /= 10.0;
-    }
-    d += frac * sign;
-  }
-
-  // Exponential
-  if (i < len && (p[i] == 'e' || p[i] == 'E')) {
-    int j, exp = 0, minus = 0;
-    i++;
-    if (i < len && p[i] == '-') minus = 1, i++;
-    if (i < len && p[i] == '+') i++;
-    while (i < len && p[i] >= '0' && p[i] <= '9' && exp < 308)
-      exp = exp * 10 + (p[i++] - '0');
-    if (minus) exp = -exp;
-    for (j = 0; j < exp; j++) d *= 10.0;
-    for (j = 0; j < -exp; j++) d /= 10.0;
-  }
-
-  if (numlen != NULL) *numlen = i;
-  return d;
-}
-
-static int addexp(char *buf, int e, int sign) {
-  int n = 0;
-  buf[n++] = 'e';
-  buf[n++] = (char) sign;
-  if (e > 400) return 0;
-  if (e < 10) buf[n++] = '0';
-  if (e >= 100) buf[n++] = (char) (e / 100 + '0'), e -= 100 * (e / 100);
-  if (e >= 10) buf[n++] = (char) (e / 10 + '0'), e -= 10 * (e / 10);
-  buf[n++] = (char) (e + '0');
-  return n;
-}
-
-static int xisinf(double x) {
-  union {
-    double f;
-    uint64_t u;
-  } ieee754 = {x};
-  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
-         ((unsigned) ieee754.u == 0);
-}
-
-static int xisnan(double x) {
-  union {
-    double f;
-    uint64_t u;
-  } ieee754 = {x};
-  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) +
-             ((unsigned) ieee754.u != 0) >
-         0x7ff00000;
-}
-
-size_t mg_dtoa(char *dst, size_t dstlen, double d, int width) {
-  char buf[40];
-  int i, s = 0, n = 0, e = 0;
-  double t, mul, saved;
-  if (d == 0.0) return mg_snprintf(dst, dstlen, "%s", "0");
-  if (xisinf(d)) return mg_snprintf(dst, dstlen, "%s", d > 0 ? "inf" : "-inf");
-  if (xisnan(d)) return mg_snprintf(dst, dstlen, "%s", "nan");
-  if (d < 0.0) d = -d, buf[s++] = '-';
-
-  // Round
-  saved = d;
-  mul = 1.0;
-  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0;
-  while (d <= 1.0 && d / mul <= 1.0) mul /= 10.0;
-  for (i = 0, t = mul * 5; i < width; i++) t /= 10.0;
-  d += t;
-  // Calculate exponent, and 'mul' for scientific representation
-  mul = 1.0;
-  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0, e++;
-  while (d < 1.0 && d / mul < 1.0) mul /= 10.0, e--;
-  // printf(" --> %g %d %g %g\n", saved, e, t, mul);
-
-  if (e >= width) {
-    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
-    // printf(" --> %.*g %d [%.*s]\n", 10, d / t, e, n, buf);
-    n += addexp(buf + s + n, e, '+');
-    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
-  } else if (e <= -width) {
-    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
-    // printf(" --> %.*g %d [%.*s]\n", 10, d / mul, e, n, buf);
-    n += addexp(buf + s + n, -e, '-');
-    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
-  } else {
-    for (i = 0, t = mul; t >= 1.0 && s + n < (int) sizeof(buf); i++) {
-      int ch = (int) (d / t);
-      if (n > 0 || ch > 0) buf[s + n++] = (char) (ch + '0');
-      d -= ch * t;
-      t /= 10.0;
-    }
-    // printf(" --> [%g] -> %g %g (%d) [%.*s]\n", saved, d, t, n, s + n, buf);
-    if (n == 0) buf[s++] = '0';
-    while (t >= 1.0 && n + s < (int) sizeof(buf)) buf[n++] = '0', t /= 10.0;
-    if (s + n < (int) sizeof(buf)) buf[n + s++] = '.';
-    // printf(" 1--> [%g] -> [%.*s]\n", saved, s + n, buf);
-    for (i = 0, t = 0.1; s + n < (int) sizeof(buf) && n < width; i++) {
-      int ch = (int) (d / t);
-      buf[s + n++] = (char) (ch + '0');
-      d -= ch * t;
-      t /= 10.0;
-    }
-  }
-  while (n > 0 && buf[s + n - 1] == '0') n--;  // Trim trailing zeros
-  if (n > 0 && buf[s + n - 1] == '.') n--;     // Trim trailing dot
-  buf[s + n] = '\0';
-  return mg_snprintf(dst, dstlen, "%s", buf);
-}
-
 #ifdef MG_ENABLE_LINES
 #line 1 "src/dns.c"
 #endif
@@ -583,6 +444,15 @@ size_t mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
   return ret;
 }
 
+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) {
   char *s = NULL;
   mg_vasprintf(&s, 0, fmt, ap);
@@ -649,6 +519,140 @@ static bool is_digit(int c) {
   return c >= '0' && c <= '9';
 }
 
+double mg_atod(const char *p, int len, int *numlen) {
+  double d = 0.0;
+  int i = 0, sign = 1;
+
+  // Sign
+  if (i < len && *p == '-') {
+    sign = -1, i++;
+  } else if (i < len && *p == '+') {
+    i++;
+  }
+
+  // Decimal
+  for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
+    d *= 10.0;
+    d += p[i] - '0';
+  }
+  d *= sign;
+
+  // Fractional
+  if (i < len && p[i] == '.') {
+    double frac = 0.0, base = 0.1;
+    i++;
+    for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
+      frac += base * (p[i] - '0');
+      base /= 10.0;
+    }
+    d += frac * sign;
+  }
+
+  // Exponential
+  if (i < len && (p[i] == 'e' || p[i] == 'E')) {
+    int j, exp = 0, minus = 0;
+    i++;
+    if (i < len && p[i] == '-') minus = 1, i++;
+    if (i < len && p[i] == '+') i++;
+    while (i < len && p[i] >= '0' && p[i] <= '9' && exp < 308)
+      exp = exp * 10 + (p[i++] - '0');
+    if (minus) exp = -exp;
+    for (j = 0; j < exp; j++) d *= 10.0;
+    for (j = 0; j < -exp; j++) d /= 10.0;
+  }
+
+  if (numlen != NULL) *numlen = i;
+  return d;
+}
+
+static int addexp(char *buf, int e, int sign) {
+  int n = 0;
+  buf[n++] = 'e';
+  buf[n++] = (char) sign;
+  if (e > 400) return 0;
+  if (e < 10) buf[n++] = '0';
+  if (e >= 100) buf[n++] = (char) (e / 100 + '0'), e -= 100 * (e / 100);
+  if (e >= 10) buf[n++] = (char) (e / 10 + '0'), e -= 10 * (e / 10);
+  buf[n++] = (char) (e + '0');
+  return n;
+}
+
+static int xisinf(double x) {
+  union {
+    double f;
+    uint64_t u;
+  } ieee754 = {x};
+  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
+         ((unsigned) ieee754.u == 0);
+}
+
+static int xisnan(double x) {
+  union {
+    double f;
+    uint64_t u;
+  } ieee754 = {x};
+  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) +
+             ((unsigned) ieee754.u != 0) >
+         0x7ff00000;
+}
+
+size_t mg_dtoa(char *dst, size_t dstlen, double d, int width) {
+  char buf[40];
+  int i, s = 0, n = 0, e = 0;
+  double t, mul, saved;
+  if (d == 0.0) return mg_snprintf(dst, dstlen, "%s", "0");
+  if (xisinf(d)) return mg_snprintf(dst, dstlen, "%s", d > 0 ? "inf" : "-inf");
+  if (xisnan(d)) return mg_snprintf(dst, dstlen, "%s", "nan");
+  if (d < 0.0) d = -d, buf[s++] = '-';
+
+  // Round
+  saved = d;
+  mul = 1.0;
+  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0;
+  while (d <= 1.0 && d / mul <= 1.0) mul /= 10.0;
+  for (i = 0, t = mul * 5; i < width; i++) t /= 10.0;
+  d += t;
+  // Calculate exponent, and 'mul' for scientific representation
+  mul = 1.0;
+  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0, e++;
+  while (d < 1.0 && d / mul < 1.0) mul /= 10.0, e--;
+  // printf(" --> %g %d %g %g\n", saved, e, t, mul);
+
+  if (e >= width) {
+    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
+    // printf(" --> %.*g %d [%.*s]\n", 10, d / t, e, n, buf);
+    n += addexp(buf + s + n, e, '+');
+    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
+  } else if (e <= -width) {
+    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
+    // printf(" --> %.*g %d [%.*s]\n", 10, d / mul, e, n, buf);
+    n += addexp(buf + s + n, -e, '-');
+    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
+  } else {
+    for (i = 0, t = mul; t >= 1.0 && s + n < (int) sizeof(buf); i++) {
+      int ch = (int) (d / t);
+      if (n > 0 || ch > 0) buf[s + n++] = (char) (ch + '0');
+      d -= ch * t;
+      t /= 10.0;
+    }
+    // printf(" --> [%g] -> %g %g (%d) [%.*s]\n", saved, d, t, n, s + n, buf);
+    if (n == 0) buf[s++] = '0';
+    while (t >= 1.0 && n + s < (int) sizeof(buf)) buf[n++] = '0', t /= 10.0;
+    if (s + n < (int) sizeof(buf)) buf[n + s++] = '.';
+    // printf(" 1--> [%g] -> [%.*s]\n", saved, s + n, buf);
+    for (i = 0, t = 0.1; s + n < (int) sizeof(buf) && n < width; i++) {
+      int ch = (int) (d / t);
+      buf[s + n++] = (char) (ch + '0');
+      d -= ch * t;
+      t /= 10.0;
+    }
+  }
+  while (n > 0 && buf[s + n - 1] == '0') n--;  // Trim trailing zeros
+  if (n > 0 && buf[s + n - 1] == '.') n--;     // Trim trailing dot
+  buf[s + n] = '\0';
+  return mg_snprintf(dst, dstlen, "%s", buf);
+}
+
 size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex) {
   const char *letters = "0123456789abcdef";
   uint64_t v = (uint64_t) val;
@@ -1044,6 +1048,7 @@ struct mg_fs mg_fs_fat = {ff_stat,  ff_list, ff_open,   ff_close,  ff_read,
 
 
 
+
 struct packed_file {
   const char *data;
   size_t size;
@@ -1424,6 +1429,7 @@ struct mg_fs mg_fs_posix = {p_stat,  p_list, p_open,   p_close,  p_read,
 
 
 
+
 // Multipart POST example:
 // --xyz
 // Content-Disposition: form-data; name="val"
@@ -2437,6 +2443,7 @@ void mg_iobuf_free(struct mg_iobuf *io) {
 
 
 
+
 static const char *escapeseq(int esc) {
   return esc ? "\b\f\n\r\t\\\"" : "bfnrt\\\"";
 }
@@ -2696,6 +2703,8 @@ long mg_json_get_long(struct mg_str json, const char *path, long dflt) {
 
 
 
+
+
 static void default_logger(unsigned char c) {
   putchar(c);
   (void) c;
@@ -4845,15 +4854,6 @@ bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v) {
   return mg_split(s, k, v, ',');
 }
 
-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_hex(const void *buf, size_t len, char *to) {
   const unsigned char *p = (const unsigned char *) buf;
   const char *hex = "0123456789abcdef";
@@ -5618,6 +5618,7 @@ uint64_t mg_millis(void) {
 
 
 
+
 struct ws_msg {
   uint8_t flags;
   size_t header_len;
diff --git a/mongoose.h b/mongoose.h
index 89bea842..f918ccba 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -744,16 +744,21 @@ unsigned long mg_unhexn(const char *s, size_t len);
 int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 int64_t mg_to64(struct mg_str str);
 uint64_t mg_tou64(struct mg_str str);
-size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
-double mg_atod(const char *buf, int len, int *numlen);
-size_t mg_dtoa(char *buf, size_t len, double d, int width);
 char *mg_remove_double_dots(char *s);
 
+
+
+
+
 typedef void (*mg_pfn_t)(char, void *);                  // Custom putchar
 typedef size_t (*mg_pm_t)(mg_pfn_t, void *, va_list *);  // %M printer
 void mg_pfn_realloc(char ch, void *param);  // Print to malloced str
 void mg_pfn_iobuf(char ch, void *param);    // Print to iobuf
 
+size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
+double mg_atod(const char *buf, int len, int *numlen);
+size_t mg_dtoa(char *buf, size_t len, double d, int width);
+
 size_t mg_vrprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
 size_t mg_rprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
 size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap);
@@ -1356,6 +1361,7 @@ char *mg_json_get_b64(struct mg_str json, const char *path, int *len);
 
 
 
+
 // JSON-RPC request descriptor
 struct mg_rpc_req {
   struct mg_str frame;  // Request, e.g. {"id":1,"method":"add","params":[1,2]}
diff --git a/src/dbl.c b/src/dbl.c
deleted file mode 100644
index 9e45dcec..00000000
--- a/src/dbl.c
+++ /dev/null
@@ -1,135 +0,0 @@
-#include "str.h"
-
-double mg_atod(const char *p, int len, int *numlen) {
-  double d = 0.0;
-  int i = 0, sign = 1;
-
-  // Sign
-  if (i < len && *p == '-') {
-    sign = -1, i++;
-  } else if (i < len && *p == '+') {
-    i++;
-  }
-
-  // Decimal
-  for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
-    d *= 10.0;
-    d += p[i] - '0';
-  }
-  d *= sign;
-
-  // Fractional
-  if (i < len && p[i] == '.') {
-    double frac = 0.0, base = 0.1;
-    i++;
-    for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
-      frac += base * (p[i] - '0');
-      base /= 10.0;
-    }
-    d += frac * sign;
-  }
-
-  // Exponential
-  if (i < len && (p[i] == 'e' || p[i] == 'E')) {
-    int j, exp = 0, minus = 0;
-    i++;
-    if (i < len && p[i] == '-') minus = 1, i++;
-    if (i < len && p[i] == '+') i++;
-    while (i < len && p[i] >= '0' && p[i] <= '9' && exp < 308)
-      exp = exp * 10 + (p[i++] - '0');
-    if (minus) exp = -exp;
-    for (j = 0; j < exp; j++) d *= 10.0;
-    for (j = 0; j < -exp; j++) d /= 10.0;
-  }
-
-  if (numlen != NULL) *numlen = i;
-  return d;
-}
-
-static int addexp(char *buf, int e, int sign) {
-  int n = 0;
-  buf[n++] = 'e';
-  buf[n++] = (char) sign;
-  if (e > 400) return 0;
-  if (e < 10) buf[n++] = '0';
-  if (e >= 100) buf[n++] = (char) (e / 100 + '0'), e -= 100 * (e / 100);
-  if (e >= 10) buf[n++] = (char) (e / 10 + '0'), e -= 10 * (e / 10);
-  buf[n++] = (char) (e + '0');
-  return n;
-}
-
-static int xisinf(double x) {
-  union {
-    double f;
-    uint64_t u;
-  } ieee754 = {x};
-  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
-         ((unsigned) ieee754.u == 0);
-}
-
-static int xisnan(double x) {
-  union {
-    double f;
-    uint64_t u;
-  } ieee754 = {x};
-  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) +
-             ((unsigned) ieee754.u != 0) >
-         0x7ff00000;
-}
-
-size_t mg_dtoa(char *dst, size_t dstlen, double d, int width) {
-  char buf[40];
-  int i, s = 0, n = 0, e = 0;
-  double t, mul, saved;
-  if (d == 0.0) return mg_snprintf(dst, dstlen, "%s", "0");
-  if (xisinf(d)) return mg_snprintf(dst, dstlen, "%s", d > 0 ? "inf" : "-inf");
-  if (xisnan(d)) return mg_snprintf(dst, dstlen, "%s", "nan");
-  if (d < 0.0) d = -d, buf[s++] = '-';
-
-  // Round
-  saved = d;
-  mul = 1.0;
-  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0;
-  while (d <= 1.0 && d / mul <= 1.0) mul /= 10.0;
-  for (i = 0, t = mul * 5; i < width; i++) t /= 10.0;
-  d += t;
-  // Calculate exponent, and 'mul' for scientific representation
-  mul = 1.0;
-  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0, e++;
-  while (d < 1.0 && d / mul < 1.0) mul /= 10.0, e--;
-  // printf(" --> %g %d %g %g\n", saved, e, t, mul);
-
-  if (e >= width) {
-    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
-    // printf(" --> %.*g %d [%.*s]\n", 10, d / t, e, n, buf);
-    n += addexp(buf + s + n, e, '+');
-    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
-  } else if (e <= -width) {
-    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
-    // printf(" --> %.*g %d [%.*s]\n", 10, d / mul, e, n, buf);
-    n += addexp(buf + s + n, -e, '-');
-    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
-  } else {
-    for (i = 0, t = mul; t >= 1.0 && s + n < (int) sizeof(buf); i++) {
-      int ch = (int) (d / t);
-      if (n > 0 || ch > 0) buf[s + n++] = (char) (ch + '0');
-      d -= ch * t;
-      t /= 10.0;
-    }
-    // printf(" --> [%g] -> %g %g (%d) [%.*s]\n", saved, d, t, n, s + n, buf);
-    if (n == 0) buf[s++] = '0';
-    while (t >= 1.0 && n + s < (int) sizeof(buf)) buf[n++] = '0', t /= 10.0;
-    if (s + n < (int) sizeof(buf)) buf[n + s++] = '.';
-    // printf(" 1--> [%g] -> [%.*s]\n", saved, s + n, buf);
-    for (i = 0, t = 0.1; s + n < (int) sizeof(buf) && n < width; i++) {
-      int ch = (int) (d / t);
-      buf[s + n++] = (char) (ch + '0');
-      d -= ch * t;
-      t /= 10.0;
-    }
-  }
-  while (n > 0 && buf[s + n - 1] == '0') n--;  // Trim trailing zeros
-  if (n > 0 && buf[s + n - 1] == '.') n--;     // Trim trailing dot
-  buf[s + n] = '\0';
-  return mg_snprintf(dst, dstlen, "%s", buf);
-}
diff --git a/src/event.c b/src/event.c
index 0e5391b9..f8fefa23 100644
--- a/src/event.c
+++ b/src/event.c
@@ -1,7 +1,7 @@
 #include "event.h"
+#include "fmt.h"
 #include "log.h"
 #include "net.h"
-#include "util.h"
 
 void mg_call(struct mg_connection *c, int ev, void *ev_data) {
   // Run user-defined handler first, in order to give it an ability
diff --git a/src/fmt.c b/src/fmt.c
index a3bc03c0..930d9d6f 100644
--- a/src/fmt.c
+++ b/src/fmt.c
@@ -1,5 +1,5 @@
+#include "fmt.h"
 #include "iobuf.h"
-#include "str.h"
 
 size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap) {
   va_list ap_copy;
@@ -32,6 +32,15 @@ size_t mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
   return ret;
 }
 
+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) {
   char *s = NULL;
   mg_vasprintf(&s, 0, fmt, ap);
@@ -98,6 +107,140 @@ static bool is_digit(int c) {
   return c >= '0' && c <= '9';
 }
 
+double mg_atod(const char *p, int len, int *numlen) {
+  double d = 0.0;
+  int i = 0, sign = 1;
+
+  // Sign
+  if (i < len && *p == '-') {
+    sign = -1, i++;
+  } else if (i < len && *p == '+') {
+    i++;
+  }
+
+  // Decimal
+  for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
+    d *= 10.0;
+    d += p[i] - '0';
+  }
+  d *= sign;
+
+  // Fractional
+  if (i < len && p[i] == '.') {
+    double frac = 0.0, base = 0.1;
+    i++;
+    for (; i < len && p[i] >= '0' && p[i] <= '9'; i++) {
+      frac += base * (p[i] - '0');
+      base /= 10.0;
+    }
+    d += frac * sign;
+  }
+
+  // Exponential
+  if (i < len && (p[i] == 'e' || p[i] == 'E')) {
+    int j, exp = 0, minus = 0;
+    i++;
+    if (i < len && p[i] == '-') minus = 1, i++;
+    if (i < len && p[i] == '+') i++;
+    while (i < len && p[i] >= '0' && p[i] <= '9' && exp < 308)
+      exp = exp * 10 + (p[i++] - '0');
+    if (minus) exp = -exp;
+    for (j = 0; j < exp; j++) d *= 10.0;
+    for (j = 0; j < -exp; j++) d /= 10.0;
+  }
+
+  if (numlen != NULL) *numlen = i;
+  return d;
+}
+
+static int addexp(char *buf, int e, int sign) {
+  int n = 0;
+  buf[n++] = 'e';
+  buf[n++] = (char) sign;
+  if (e > 400) return 0;
+  if (e < 10) buf[n++] = '0';
+  if (e >= 100) buf[n++] = (char) (e / 100 + '0'), e -= 100 * (e / 100);
+  if (e >= 10) buf[n++] = (char) (e / 10 + '0'), e -= 10 * (e / 10);
+  buf[n++] = (char) (e + '0');
+  return n;
+}
+
+static int xisinf(double x) {
+  union {
+    double f;
+    uint64_t u;
+  } ieee754 = {x};
+  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
+         ((unsigned) ieee754.u == 0);
+}
+
+static int xisnan(double x) {
+  union {
+    double f;
+    uint64_t u;
+  } ieee754 = {x};
+  return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) +
+             ((unsigned) ieee754.u != 0) >
+         0x7ff00000;
+}
+
+size_t mg_dtoa(char *dst, size_t dstlen, double d, int width) {
+  char buf[40];
+  int i, s = 0, n = 0, e = 0;
+  double t, mul, saved;
+  if (d == 0.0) return mg_snprintf(dst, dstlen, "%s", "0");
+  if (xisinf(d)) return mg_snprintf(dst, dstlen, "%s", d > 0 ? "inf" : "-inf");
+  if (xisnan(d)) return mg_snprintf(dst, dstlen, "%s", "nan");
+  if (d < 0.0) d = -d, buf[s++] = '-';
+
+  // Round
+  saved = d;
+  mul = 1.0;
+  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0;
+  while (d <= 1.0 && d / mul <= 1.0) mul /= 10.0;
+  for (i = 0, t = mul * 5; i < width; i++) t /= 10.0;
+  d += t;
+  // Calculate exponent, and 'mul' for scientific representation
+  mul = 1.0;
+  while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0, e++;
+  while (d < 1.0 && d / mul < 1.0) mul /= 10.0, e--;
+  // printf(" --> %g %d %g %g\n", saved, e, t, mul);
+
+  if (e >= width) {
+    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
+    // printf(" --> %.*g %d [%.*s]\n", 10, d / t, e, n, buf);
+    n += addexp(buf + s + n, e, '+');
+    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
+  } else if (e <= -width) {
+    n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
+    // printf(" --> %.*g %d [%.*s]\n", 10, d / mul, e, n, buf);
+    n += addexp(buf + s + n, -e, '-');
+    return mg_snprintf(dst, dstlen, "%.*s", n, buf);
+  } else {
+    for (i = 0, t = mul; t >= 1.0 && s + n < (int) sizeof(buf); i++) {
+      int ch = (int) (d / t);
+      if (n > 0 || ch > 0) buf[s + n++] = (char) (ch + '0');
+      d -= ch * t;
+      t /= 10.0;
+    }
+    // printf(" --> [%g] -> %g %g (%d) [%.*s]\n", saved, d, t, n, s + n, buf);
+    if (n == 0) buf[s++] = '0';
+    while (t >= 1.0 && n + s < (int) sizeof(buf)) buf[n++] = '0', t /= 10.0;
+    if (s + n < (int) sizeof(buf)) buf[n + s++] = '.';
+    // printf(" 1--> [%g] -> [%.*s]\n", saved, s + n, buf);
+    for (i = 0, t = 0.1; s + n < (int) sizeof(buf) && n < width; i++) {
+      int ch = (int) (d / t);
+      buf[s + n++] = (char) (ch + '0');
+      d -= ch * t;
+      t /= 10.0;
+    }
+  }
+  while (n > 0 && buf[s + n - 1] == '0') n--;  // Trim trailing zeros
+  if (n > 0 && buf[s + n - 1] == '.') n--;     // Trim trailing dot
+  buf[s + n] = '\0';
+  return mg_snprintf(dst, dstlen, "%s", buf);
+}
+
 size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex) {
   const char *letters = "0123456789abcdef";
   uint64_t v = (uint64_t) val;
diff --git a/src/fmt.h b/src/fmt.h
new file mode 100644
index 00000000..33f6ea1e
--- /dev/null
+++ b/src/fmt.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "arch.h"
+#include "iobuf.h"
+
+typedef void (*mg_pfn_t)(char, void *);                  // Custom putchar
+typedef size_t (*mg_pm_t)(mg_pfn_t, void *, va_list *);  // %M printer
+void mg_pfn_realloc(char ch, void *param);  // Print to malloced str
+void mg_pfn_iobuf(char ch, void *param);    // Print to iobuf
+
+size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
+double mg_atod(const char *buf, int len, int *numlen);
+size_t mg_dtoa(char *buf, size_t len, double d, int width);
+
+size_t mg_vrprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
+size_t mg_rprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
+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, ...);
+size_t mg_asprintf(char **, size_t, const char *fmt, ...);
+size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
+char *mg_mprintf(const char *fmt, ...);
+char *mg_vmprintf(const char *fmt, va_list ap);
diff --git a/src/fs.c b/src/fs.c
index ad329f2b..0d5e070c 100644
--- a/src/fs.c
+++ b/src/fs.c
@@ -1,5 +1,5 @@
 #include "fs.h"
-#include "util.h"
+#include "fmt.h"
 
 struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags) {
   struct mg_fd *fd = (struct mg_fd *) calloc(1, sizeof(*fd));
diff --git a/src/fs_packed.c b/src/fs_packed.c
index 179666fb..195e9ae7 100644
--- a/src/fs_packed.c
+++ b/src/fs_packed.c
@@ -1,3 +1,4 @@
+#include "fmt.h"
 #include "fs.h"
 #include "str.h"
 
diff --git a/src/http.c b/src/http.c
index f5605fb4..f1033ca2 100644
--- a/src/http.c
+++ b/src/http.c
@@ -1,6 +1,7 @@
 #include "http.h"
 #include "arch.h"
 #include "base64.h"
+#include "fmt.h"
 #include "log.h"
 #include "net.h"
 #include "ssi.h"
diff --git a/src/json.c b/src/json.c
index 00d6f1da..28c45274 100644
--- a/src/json.c
+++ b/src/json.c
@@ -1,5 +1,6 @@
 #include "json.h"
 #include "base64.h"
+#include "fmt.h"
 
 static const char *escapeseq(int esc) {
   return esc ? "\b\f\n\r\t\\\"" : "bfnrt\\\"";
diff --git a/src/log.c b/src/log.c
index 48eb124f..0caca063 100644
--- a/src/log.c
+++ b/src/log.c
@@ -1,4 +1,6 @@
 #include "log.h"
+#include "fmt.h"
+#include "str.h"
 #include "util.h"
 
 static void default_logger(unsigned char c) {
diff --git a/src/net.c b/src/net.c
index f3c0dd03..0330915b 100644
--- a/src/net.c
+++ b/src/net.c
@@ -1,9 +1,9 @@
 #include "net.h"
 #include "dns.h"
+#include "fmt.h"
 #include "log.h"
 #include "timer.h"
 #include "tls.h"
-#include "util.h"
 
 size_t mg_vprintf(struct mg_connection *c, const char *fmt, va_list ap) {
   size_t old = c->send.len;
diff --git a/src/rpc.h b/src/rpc.h
index 2af75f93..b16ae7e4 100644
--- a/src/rpc.h
+++ b/src/rpc.h
@@ -1,4 +1,5 @@
 #pragma once
+#include "fmt.h"
 #include "json.h"
 
 // JSON-RPC request descriptor
diff --git a/src/ssi.c b/src/ssi.c
index 55c3085a..99215171 100644
--- a/src/ssi.c
+++ b/src/ssi.c
@@ -1,6 +1,6 @@
 #include "ssi.h"
+#include "fmt.h"
 #include "log.h"
-#include "util.h"
 
 #ifndef MG_MAX_SSI_DEPTH
 #define MG_MAX_SSI_DEPTH 5
diff --git a/src/str.c b/src/str.c
index b5aaaf19..329a067d 100644
--- a/src/str.c
+++ b/src/str.c
@@ -155,15 +155,6 @@ bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v) {
   return mg_split(s, k, v, ',');
 }
 
-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_hex(const void *buf, size_t len, char *to) {
   const unsigned char *p = (const unsigned char *) buf;
   const char *hex = "0123456789abcdef";
diff --git a/src/str.h b/src/str.h
index 883f2f36..597d2ad7 100644
--- a/src/str.h
+++ b/src/str.h
@@ -37,21 +37,4 @@ unsigned long mg_unhexn(const char *s, size_t len);
 int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 int64_t mg_to64(struct mg_str str);
 uint64_t mg_tou64(struct mg_str str);
-size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
-double mg_atod(const char *buf, int len, int *numlen);
-size_t mg_dtoa(char *buf, size_t len, double d, int width);
 char *mg_remove_double_dots(char *s);
-
-typedef void (*mg_pfn_t)(char, void *);                  // Custom putchar
-typedef size_t (*mg_pm_t)(mg_pfn_t, void *, va_list *);  // %M printer
-void mg_pfn_realloc(char ch, void *param);  // Print to malloced str
-void mg_pfn_iobuf(char ch, void *param);    // Print to iobuf
-
-size_t mg_vrprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
-size_t mg_rprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
-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, ...);
-size_t mg_asprintf(char **, size_t, const char *fmt, ...);
-size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
-char *mg_mprintf(const char *fmt, ...);
-char *mg_vmprintf(const char *fmt, va_list ap);
diff --git a/src/ws.c b/src/ws.c
index 243652b5..6099d2b5 100644
--- a/src/ws.c
+++ b/src/ws.c
@@ -1,6 +1,7 @@
 #include "ws.h"
 
 #include "base64.h"
+#include "fmt.h"
 #include "http.h"
 #include "log.h"
 #include "sha1.h"