From b1f691f2deb0b59c6e237241e1995c5d95f37ffa Mon Sep 17 00:00:00 2001
From: Franklin Wei <me@fwei.tk>
Date: Thu, 17 Aug 2017 15:27:52 -0400
Subject: Introduce ftoa() as a replacement for the %g format specifier

Not all platforms support printing floats, this is a more
portable (if uglier) way.
---
 midend.c   | 2 +-
 misc.c     | 6 ++++++
 net.c      | 7 +++++--
 netslide.c | 7 +++++--
 puzzles.h  | 4 ++++
 rect.c     | 7 +++++--
 6 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/midend.c b/midend.c
index 15636d4..f2d27d3 100644
--- a/midend.c
+++ b/midend.c
@@ -2049,7 +2049,7 @@ void midend_serialise(midend *me,
      */
     if (me->ourgame->is_timed) {
         char buf[80];
-        sprintf(buf, "%g", me->elapsed);
+        ftoa(buf, me->elapsed);
         wr("TIME", buf);
     }
 
diff --git a/misc.c b/misc.c
index bb9019e..ed31acb 100644
--- a/misc.c
+++ b/misc.c
@@ -402,6 +402,12 @@ void copy_left_justified(char *buf, size_t sz, const char *str)
     buf[sz - 1] = 0;
 }
 
+/* another kludge for platforms without %g support in *printf() */
+int ftoa(char *buf, float f)
+{
+    return sprintf(buf, "%d.%06d", (int)f, abs((int)((f - (int)f)*1e6)));
+}
+
 /* Returns a dynamically allocated label for a generic button.
  * Game-specific buttons should go into the `label' field of key_label
  * instead. */
diff --git a/net.c b/net.c
index 5796e95..d3032b6 100644
--- a/net.c
+++ b/net.c
@@ -249,7 +249,10 @@ static char *encode_params(const game_params *params, bool full)
     if (params->wrapping)
         ret[len++] = 'w';
     if (full && params->barrier_probability)
-        len += sprintf(ret+len, "b%g", params->barrier_probability);
+    {
+        len += sprintf(ret+len, "b");
+        len += ftoa(ret + len, params->barrier_probability);
+    }
     if (full && !params->unique)
         ret[len++] = 'a';
     assert(len < lenof(ret));
@@ -281,7 +284,7 @@ static config_item *game_configure(const game_params *params)
 
     ret[3].name = "Barrier probability";
     ret[3].type = C_STRING;
-    sprintf(buf, "%g", params->barrier_probability);
+    ftoa(buf, params->barrier_probability);
     ret[3].u.string.sval = dupstr(buf);
 
     ret[4].name = "Ensure unique solution";
diff --git a/netslide.c b/netslide.c
index a2e3281..14af2a6 100644
--- a/netslide.c
+++ b/netslide.c
@@ -242,7 +242,10 @@ static char *encode_params(const game_params *params, bool full)
     if (params->wrapping)
         ret[len++] = 'w';
     if (full && params->barrier_probability)
-        len += sprintf(ret+len, "b%g", params->barrier_probability);
+    {
+        len += sprintf(ret+len, "b");
+        len += ftoa(ret + len, params->barrier_probability);
+    }
     /* Shuffle limit is part of the limited parameters, because we have to
      * provide the target move count. */
     if (params->movetarget)
@@ -276,7 +279,7 @@ static config_item *game_configure(const game_params *params)
 
     ret[3].name = "Barrier probability";
     ret[3].type = C_STRING;
-    sprintf(buf, "%g", params->barrier_probability);
+    ftoa(buf, params->barrier_probability);
     ret[3].u.string.sval = dupstr(buf);
 
     ret[4].name = "Number of shuffling moves";
diff --git a/puzzles.h b/puzzles.h
index d46a70e..29b00dd 100644
--- a/puzzles.h
+++ b/puzzles.h
@@ -416,6 +416,10 @@ void draw_text_outline(drawing *dr, int x, int y, int fonttype,
  * less than buffer size. */
 void copy_left_justified(char *buf, size_t sz, const char *str);
 
+/* An ugly, but working float-to-string implementation for platforms
+ * that don't have one */
+int ftoa(char *buf, float f);
+
 /* Returns a generic label based on the value of `button.' To be used
    whenever a `label' field returned by the request_keys() game
    function is NULL. Dynamically allocated, to be freed by caller. */
diff --git a/rect.c b/rect.c
index 3cb67bd..b13de75 100644
--- a/rect.c
+++ b/rect.c
@@ -163,7 +163,10 @@ static char *encode_params(const game_params *params, bool full)
 
     sprintf(data, "%dx%d", params->w, params->h);
     if (full && params->expandfactor)
-        sprintf(data + strlen(data), "e%g", params->expandfactor);
+    {
+        sprintf(data + strlen(data), "e");
+        ftoa(data + strlen(data), params->expandfactor);
+    }
     if (full && !params->unique)
         strcat(data, "a");
 
@@ -189,7 +192,7 @@ static config_item *game_configure(const game_params *params)
 
     ret[2].name = "Expansion factor";
     ret[2].type = C_STRING;
-    sprintf(buf, "%g", params->expandfactor);
+    ftoa(buf, params->expandfactor);
     ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Ensure unique solution";
-- 
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