Drop the C shim for float formatting now that jsonpull is C++

json_print_one() reached fpfmt through dtoa_shortest(), a C-linkage
wrapper in text.cpp that strdup()ed the formatted string so the C
jsonpull could take it and free() it. jsonpull has been C++ since 4f26211,
so it can append the std::string directly and skip the copy, the
allocation, and the free.

That was the shim's only caller, so fpfmt/fpfmt.h goes away with it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014wJRAuhMninQE4wK2TUfuZ

CHANGELOG.md

@@ -9,7 +9,9 @@
   final digit (`9.823748927348929e+55` becomes `9.823748927348928e+55`). Every
   such value still parses back to exactly the same double, so this changes only
   the spelling, never the number. `make fpfmt-bench` rebuilds the head-to-head
-  comparison against the old implementation.
+  comparison against the old implementation. `jsonpull`, now that it is C++,
+  calls `fpfmt::dtoa()` directly rather than through the `strdup`ing C shim
+  that `milo/milo.h` used to declare.
 
 # 2.82.0
 

fpfmt/fpfmt.h

@@ -1,14 +0,0 @@
-// C-callable shortest-float formatting, for jsonpull.
-// The implementation lives in text.cpp and calls fpfmt::dtoa().
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// dtoa_shortest returns a newly strdup()ed shortest decimal form of val.
-// The caller owns the result.
-char *dtoa_shortest(double val);
-
-#ifdef __cplusplus
-}
-#endif

jsonpull/jsonpull.cpp

@@ -11,7 +11,7 @@
 #include <string>
 #include <vector>
 #include "jsonpull.h"
-#include "../fpfmt/fpfmt.h"
+#include "../fpfmt/fpfmt.hpp"
 
 #define BUFFER 10000
 
@@ -803,9 +803,7 @@ static void json_print_one(std::string &val, const json_object *o) {
 			snprintf(s, sizeof(s), "%llu", o->large_unsigned());
 			val.append(s);
 		} else {
-			char *s = dtoa_shortest(o->number());
-			val.append(s);
-			free(s);
+			val.append(fpfmt::dtoa(o->number()));
 		}
 	} else if (o->type == JSON_NULL) {
 		val.append("null");

text.cpp

@@ -6,7 +6,6 @@
 #include <vector>
 #include "text.hpp"
 #include "fpfmt/fpfmt.hpp"
-#include "fpfmt/fpfmt.h"
 #include "errors.hpp"
 
 /**
@@ -176,17 +175,6 @@ std::string format_commandline(int argc, char **argv) {
 	return out;
 }
 
-// for jsonpull to call from C
-char *dtoa_shortest(double val) {
-	std::string s = fpfmt::dtoa(val);
-	char *dup = strdup(s.c_str());
-	if (dup == NULL) {
-		perror("strdup");
-		exit(EXIT_MEMORY);
-	}
-	return dup;
-}
-
 // to work with data from https://github.com/kmike/text-unidecode
 std::vector<std::string> read_unidecode(const char *fname) {
 	std::string data;