Add generic/Demangle.c

Signed-off-by: Kang-Che Sung <[email protected]>

Author: Explorer09

Makefile.am

@@ -166,6 +166,11 @@ myhtopheaders = \
 	Vector.h \
 	XUtils.h
 
+if HAVE_DEMANGLING
+myhtopheaders += generic/Demangle.h
+myhtopsources += generic/Demangle.c
+endif
+
 # Linux
 # -----
 

generic/Demangle.c

@@ -0,0 +1,65 @@
+/*
+htop - generic/Demangle.h
+(C) 2025 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "config.h" // IWYU pragma: keep
+
+#include "generic/Demangle.h"
+
+#include <stdint.h> // IWYU pragma: keep
+#include <stdlib.h> // IWYU pragma: keep
+
+#ifdef HAVE_DEMANGLE_H
+# if !defined(HAVE_DECL_BASENAME)
+// Suppress libiberty's own declaration of basename().
+// It's a pity that we need this workaround as libiberty developers
+// refuse fix their headers and export an unwanted interface to us.
+// htop doesn't use basename() API. (The POSIX version is flawed by
+// design; libiberty's ships with GNU version of basename() that's
+// incompatible with POSIX.)
+// <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122729>
+#  define HAVE_DECL_BASENAME 1
+# endif
+#include <demangle.h>
+#endif
+
+
+#ifdef HAVE_DEMANGLING
+char* Generic_Demangle(const char* mangled) {
+# if defined(HAVE_LIBIBERTY_CPLUS_DEMANGLE)
+   int options = DMGL_PARAMS | DMGL_AUTO;
+   return cplus_demangle(mangled, options);
+# elif defined(HAVE_LIBDEMANGLE_CPLUS_DEMANGLE)
+   // The cplus_demangle() API from libdemangle is flawed. It does not
+   // provide us the required size of the buffer to store the demangled
+   // name, and it leaves the buffer content undefined if the specified
+   // buffer size is not big enough.
+   static size_t allocSize = 8;
+
+   char* buf;
+
+   while (!!(buf = malloc(allocSize))) {
+      int ret = cplus_demangle(mangled, buf, allocSize);
+      if (ret == 0)
+         break;
+
+      free(buf);
+      buf = NULL;
+
+      if (ret != DEMANGLE_ESPACE || allocSize > SIZE_MAX / 2)
+         break;
+
+      allocSize *= 2;
+   }
+
+   return buf;
+# endif
+
+   // Unimplemented
+   (void)mangled;
+   return NULL;
+}
+#endif

generic/Demangle.h

@@ -0,0 +1,24 @@
+#ifndef HEADER_Demangle
+#define HEADER_Demangle
+/*
+htop - generic/Demangle.h
+(C) 2025 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "Macros.h"
+
+
+#ifdef HAVE_DEMANGLING
+ATTR_NONNULL ATTR_MALLOC
+char* Generic_Demangle(const char* mangled);
+#else
+ATTR_NONNULL
+static inline char* Generic_Demangle(const char* mangled) {
+   (void)mangled;
+   return NULL;
+}
+#endif
+
+#endif