From 6cdd576d4176c2581f796c2066ca0f92bda03c9e Mon Sep 17 00:00:00 2001
From: badayvedat <badayvedat@gmail.com>
Date: Sat, 14 Mar 2026 23:08:21 +0300
Subject: [PATCH] libzigc: fdim

---
 lib/c/math.zig                | 14 ++++++++++++++
 lib/libc/musl/src/math/fdim.c | 10 ----------
 src/libs/musl.zig             |  1 -
 src/libs/wasi_libc.zig        |  1 -
 test/libc.zig                 |  2 +-
 5 files changed, 15 insertions(+), 13 deletions(-)
 delete mode 100644 lib/libc/musl/src/math/fdim.c

diff --git a/lib/c/math.zig b/lib/c/math.zig
index 3f7b9ca237424d16173ef8b69c947b4e9de18b23..5b191c3e93c80d24bfdc4ae823f80b77f1fcb64f 100644
--- a/lib/c/math.zig
+++ b/lib/c/math.zig
@@ -59,6 +59,7 @@ comptime {
         symbol(&cosh, "cosh");
         symbol(&exp10, "exp10");
         symbol(&exp10f, "exp10f");
+        symbol(&fdim, "fdim");
         symbol(&hypot, "hypot");
         symbol(&modf, "modf");
         symbol(&pow, "pow");
@@ -147,6 +148,19 @@ fn exp10f(x: f32) callconv(.c) f32 {
     return math.pow(f32, 10.0, x);
 }
 
+fn fdim(x: f64, y: f64) callconv(.c) f64 {
+    if (math.isNan(x)) {
+        return x;
+    }
+    if (math.isNan(y)) {
+        return y;
+    }
+    if (x > y) {
+        return x - y;
+    }
+    return 0;
+}
+
 fn hypot(x: f64, y: f64) callconv(.c) f64 {
     return math.hypot(x, y);
 }
diff --git a/lib/libc/musl/src/math/fdim.c b/lib/libc/musl/src/math/fdim.c
deleted file mode 100644
index 958546064389bfa3bb5bb2fc16b728726b3ea1f6..0000000000000000000000000000000000000000
--- a/lib/libc/musl/src/math/fdim.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <math.h>
-
-double fdim(double x, double y)
-{
-	if (isnan(x))
-		return x;
-	if (isnan(y))
-		return y;
-	return x > y ? x - y : 0;
-}
diff --git a/src/libs/musl.zig b/src/libs/musl.zig
index b96ffbf18a324457960f821e0814a7f9bf372113..96b101c330954691f98d776c8c0fe54b8daa9c12 100644
--- a/src/libs/musl.zig
+++ b/src/libs/musl.zig
@@ -830,7 +830,6 @@ const src_files = [_][]const u8{
     "musl/src/math/expm1l.c",
     "musl/src/math/__expo2.c",
     "musl/src/math/__expo2f.c",
-    "musl/src/math/fdim.c",
     "musl/src/math/fdimf.c",
     "musl/src/math/fdiml.c",
     "musl/src/math/finite.c",
diff --git a/src/libs/wasi_libc.zig b/src/libs/wasi_libc.zig
index de7cabd542d5841c24344a33ae532fadd2c5cb2d..12edf9b783a9a1954c008f229178756a937bfb21 100644
--- a/src/libs/wasi_libc.zig
+++ b/src/libs/wasi_libc.zig
@@ -695,7 +695,6 @@ const libc_top_half_src_files = [_][]const u8{
     "musl/src/math/expm1.c",
     "musl/src/math/expm1f.c",
     "musl/src/math/expm1l.c",
-    "musl/src/math/fdim.c",
     "musl/src/math/fdimf.c",
     "musl/src/math/fdiml.c",
     "musl/src/math/finite.c",
diff --git a/test/libc.zig b/test/libc.zig
index 1257c690e814fb801da84b1e7d2740803d6a79f8..fde63d224d24cb10eccfb84690aa2196959cc58a 100644
--- a/test/libc.zig
+++ b/test/libc.zig
@@ -197,7 +197,7 @@ pub fn addCases(cases: *tests.LibcContext) void {
     cases.addLibcTestCase("math/fabs.c", true, .{});
     cases.addLibcTestCase("math/fabsf.c", true, .{});
     cases.addLibcTestCase("math/fabsl.c", true, .{});
-    // cases.addLibcTestCase("math/fdim.c", true, .{});
+    cases.addLibcTestCase("math/fdim.c", true, .{});
     // cases.addLibcTestCase("math/fdimf.c", true, .{});
     // cases.addLibcTestCase("math/fdiml.c", true, .{});
     cases.addLibcTestCase("math/fenv.c", true, .{});
-- 
2.54.0