Fix 12 more Windows test failures: mkstemp, temp paths, TRE config

- cbm_mkstemp: Windows implementation using _mktemp + _open
- cbm_tmpdir(): portable temp directory function (replaces /tmp/)
- Fix hardcoded /tmp/ paths in test_language, test_gitignore,
  test_store_search, test_sqlite_writer
- Enlarge remaining small path buffers for Windows %TEMP% paths

Author: DeusData

src/foundation/compat.c

@@ -8,6 +8,11 @@
 
 #include <stdlib.h>
 #include <string.h>
+#ifdef _WIN32
+#include <io.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#endif
 
 /* ── strndup (Windows lacks it) ───────────────────────────────── */
 
@@ -72,6 +77,31 @@ char *cbm_mkdtemp(char *tmpl) {
 }
 #endif
 
+/* ── mkstemp (Windows lacks it) ───────────────────────────────── */
+
+#ifdef _WIN32
+int cbm_mkstemp(char *tmpl) {
+    /* Rewrite /tmp/ to %TEMP%\ like cbm_mkdtemp */
+    static char buf[512];
+    if (strncmp(tmpl, "/tmp/", 5) == 0) {
+        const char *tmp = getenv("TEMP");
+        if (!tmp)
+            tmp = getenv("TMP");
+        if (!tmp)
+            tmp = ".";
+        snprintf(buf, sizeof(buf), "%s\\%s", tmp, tmpl + 5);
+    } else {
+        snprintf(buf, sizeof(buf), "%s", tmpl);
+    }
+    if (!_mktemp(buf))
+        return -1;
+    int fd = _open(buf, _O_CREAT | _O_RDWR | _O_BINARY, _S_IREAD | _S_IWRITE);
+    if (fd >= 0)
+        strcpy(tmpl, buf);
+    return fd;
+}
+#endif
+
 /* ── clock_gettime (Windows lacks it) ─────────────────────────── */
 
 #ifdef _WIN32

src/foundation/compat.h

@@ -97,6 +97,13 @@ char *cbm_mkdtemp(char *tmpl);
 #define cbm_mkdtemp mkdtemp
 #endif
 
+/* ── mkstemp (Windows lacks it) ──────────────────────────────── */
+#ifdef _WIN32
+int cbm_mkstemp(char *tmpl);
+#else
+#define cbm_mkstemp mkstemp
+#endif
+
 /* ── setenv / unsetenv (Windows lacks them) ──────────────────── */
 #ifdef _WIN32
 static inline int cbm_setenv(const char *name, const char *value, int overwrite) {
@@ -120,6 +127,18 @@ static inline int cbm_unsetenv(const char *name) {
 #define cbm_pipe(fds) pipe(fds)
 #endif
 
+/* ── Temp directory helper ───────────────────────────────────── */
+static inline const char *cbm_tmpdir(void) {
+#ifdef _WIN32
+    const char *t = getenv("TEMP");
+    if (!t)
+        t = getenv("TMP");
+    return t ? t : ".";
+#else
+    return "/tmp";
+#endif
+}
+
 /* ── Signal handling ──────────────────────────────────────────── */
 /* Windows doesn't have sigaction; provide macro to select signal API. */
 #ifdef _WIN32

tests/test_gitignore.c

@@ -3,6 +3,7 @@
  *
  * RED phase: These tests define the expected pattern matching behavior.
  */
+#include "../src/foundation/compat.h"
 #include "test_framework.h"
 #include "discover/discover.h"
 
@@ -162,7 +163,7 @@ TEST(gi_null_safe_free) {
 /* ── Load from file ────────────────────────────────────────────── */
 
 TEST(gi_load_file) {
-    const char *path = "/tmp/test_gitignore_file";
+    char path[256]; snprintf(path, sizeof(path), "%s/test_gitignore_file", cbm_tmpdir());
     FILE *f = fopen(path, "w");
     ASSERT_NOT_NULL(f);
     fprintf(f, "*.o\nbuild/\n");
@@ -178,7 +179,9 @@ TEST(gi_load_file) {
 }
 
 TEST(gi_load_nonexistent) {
-    cbm_gitignore_t *gi = cbm_gitignore_load("/tmp/nonexistent_gitignore_12345");
+    char np[256];
+    snprintf(np, sizeof(np), "%s/nonexistent_gitignore_12345", cbm_tmpdir());
+    cbm_gitignore_t *gi = cbm_gitignore_load(np);
     ASSERT_NULL(gi);
     PASS();
 }

tests/test_language.c

@@ -3,6 +3,7 @@
  *
  * RED phase: These tests define the expected behavior for all 64 languages.
  */
+#include "../src/foundation/compat.h"
 #include "test_framework.h"
 #include "discover/discover.h"
 
@@ -542,7 +543,7 @@ TEST(lang_name_unknown) {
 /* These tests need temp files with content markers */
 TEST(lang_m_objc) {
     /* Write a temp file with Objective-C markers */
-    const char *path = "/tmp/test_lang_objc.m";
+    char path[256]; snprintf(path, sizeof(path), "%s/test_lang_objc.m", cbm_tmpdir());
     FILE *f = fopen(path, "w");
     ASSERT_NOT_NULL(f);
     fprintf(f, "#import <Foundation/Foundation.h>\n@interface Foo : NSObject\n@end\n");
@@ -554,7 +555,7 @@ TEST(lang_m_objc) {
 }
 
 TEST(lang_m_magma) {
-    const char *path = "/tmp/test_lang_magma.m";
+    char path[256]; snprintf(path, sizeof(path), "%s/test_lang_magma.m", cbm_tmpdir());
     FILE *f = fopen(path, "w");
     ASSERT_NOT_NULL(f);
     fprintf(f, "function MyFunc(x)\n  return x^2;\nend function;\n");
@@ -566,7 +567,7 @@ TEST(lang_m_magma) {
 }
 
 TEST(lang_m_matlab) {
-    const char *path = "/tmp/test_lang_matlab.m";
+    char path[256]; snprintf(path, sizeof(path), "%s/test_lang_matlab.m", cbm_tmpdir());
     FILE *f = fopen(path, "w");
     ASSERT_NOT_NULL(f);
     fprintf(f, "function y = square(x)\n  y = x.^2;\nend\n");

tests/test_sqlite_writer.c

@@ -7,6 +7,7 @@
  * The page writer (cbm_write_db) constructs B-tree pages directly,
  * bypassing the SQL parser entirely. These tests verify integrity.
  */
+#include "../src/foundation/compat.h"
 #include "test_framework.h"
 /* sqlite_writer.h is at internal/cbm/ — Makefile adds -Iinternal/cbm */
 #include "sqlite_writer.h" /* CBMDumpNode, CBMDumpEdge, cbm_write_db */
@@ -17,7 +18,7 @@
 
 static int make_temp_db(char *path, size_t pathsz) {
     snprintf(path, pathsz, "/tmp/cbm_sw_test_XXXXXX");
-    int fd = mkstemp(path);
+    int fd = cbm_mkstemp(path);
     if (fd < 0)
         return -1;
     close(fd);

tests/test_store_search.c

@@ -3,6 +3,7 @@
  *
  * Ported from internal/store/store_test.go (TestSearch, TestBFS, etc.)
  */
+#include "../src/foundation/compat.h"
 #include "test_framework.h"
 #include <store/store.h>
 #include <string.h>
@@ -434,8 +435,8 @@ TEST(store_dump_to_file) {
     ASSERT_TRUE(id > 0);
 
     /* Dump to temp file */
-    char path[] = "/tmp/cbm_test_dump_XXXXXX";
-    int fd = mkstemp(path);
+    char path[256]; snprintf(path, sizeof(path), "/tmp/cbm_test_dump_XXXXXX");
+    int fd = cbm_mkstemp(path);
     ASSERT_TRUE(fd >= 0);
     close(fd);