braindead f32FromString

all.h

@@ -704,6 +704,7 @@ fn Vec2f32 vec2FromHexCube(Vec2 map_center, XYZ cube, f32 size, f32 border_thick
 fn i32 i32Middle(i32 x, i32 y);
 fn u32 u32Middle(u32 x, u32 y);
 fn u64 u64SafeMul(u64 x, u64 y);
+fn f32 f32FromString(String s);
 
 ///// MEMORY (Arenas)
 #define ARENA_MAX GB(1)
@@ -751,6 +752,7 @@ fn u8 lowerAscii(u8 c);
 fn u8 upperAscii(u8 c);
 fn StringUTF16Const str16FromStr8(Arena* a, String string);
 fn bool isAlphaUnderscoreSpace(u8 c);
+fn bool isNumeric(char c);
 fn bool isSimplePrintable(u8 c);
 fn bool codepointIsWordBreak(Codepoint c);
 fn bool codepointIsWhitespace(Codepoint c);

math.c

@@ -146,3 +146,20 @@ fn u64 u64SafeMul(u64 x, u64 y) {
   return x * y;
 }
 
+fn f32 f32FromString(String s) {
+  f32 result = 0.0f;
+  if (s.length == 0) { return result; }
+  ptr c = s.bytes;
+  while (*c >= '0' && *c <= '9') {
+    result = result * 10.0f + (*c++ - '0');
+  }
+  if (*c == '.') {
+    c++;
+    f32 frac = 0.1f;
+    while (*c >= '0' && *c <= '9') {
+      result += (*c++ - '0') * frac;
+      frac *= 0.1f;
+    }
+  }
+  return result;
+}

string.c

@@ -96,6 +96,10 @@ fn bool isAlphaUnderscoreSpace(u8 c) {
         || c == '_');
 }
 
+fn bool isNumeric(char c) {
+  return (c >= '0' && c <= '9') || c == '.';
+}
+
 fn bool codepointIsWordBreak(Codepoint c) {
   return codepointIsWhitespace(c) ||
     c.code == ';' || c.code == ':' ||