xref: /freebsd/contrib/elftoolchain/libelftc/elftc_demangle.3 (revision ae500c1ff8974130f7f2692772cf288b90349e0d)

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.\" $Id: elftc_demangle.3 3645 2018-10-15 20:17:14Z jkoshy $
.\"
.Dd August 24, 2011
.Dt ELFTC_DEMANGLE 3
.Os
.Sh NAME
.Nm elftc_demangle
.Nd demangle a C++ name
.Sh LIBRARY
.Lb libelftc
.Sh SYNOPSIS
.In libelftc.h
.Ft int
.Fo elftc_demangle
.Fa "const char *encodedname"
.Fa "char *buffer"
.Fa "size_t bufsize"
.Fa "unsigned int flags"
.Fc
.Sh DESCRIPTION
Function
.Fn elftc_demangle
decodes a symbol name encoded according to the type encoding rules
for the C++ language and returns a string denoting an equivalent
C++ prototype.
.Pp
Argument
.Ar encodedname
specifies the encoded symbol name.
Argument
.Ar buffer
denotes a programmer-specified area to place the prototype string in.
Argument
.Ar bufsize
specifies the size of the programmer-specified area.
Argument
.Ar flags
specifies the encoding style in use for argument
.Ar encodedname .
Supported encoding styles are:
.Bl -tag -width ".Dv ELFTC_DEM_GNU3"
.It Dv ELFTC_DEM_ARM
The encoding style used by compilers adhering to the conventions of the
C++ Annotated Reference Manual.
.It Dv ELFTC_DEM_GNU2
The encoding style by GNU C++ version 2.
.It Dv ELFTC_DEM_GNU3
The encoding style by GNU C++ version 3 and later.
.El
.Pp
Argument
.Ar flags
may be zero, in which case the function will attempt to guess the
encoding scheme from the contents of
.Ar encodedname .
.Sh RETURN VALUES
Function
.Fn elftc_demangle
returns 0 on success.
In case of an error it returns -1 and sets the
.Va errno
variable.
.Sh EXAMPLES
To decode a name that uses an unknown encoding style use:
.Bd -literal -offset indent
char buffer[1024];
const char *funcname;

funcname = ...; /* points to string to be demangled */
if (elftc_demangle(funcname, buffer, sizeof(buffer), 0) == 0)
	printf("Demangled name: %\\n", buffer);
else
	perror("Cannot demangle %s", funcname);
.Ed
.Sh ERRORS
Function
.Fn elftc_demangle
may fail with the following errors:
.Bl -tag -width ".Bq Er ENAMETOOLONG"
.It Bq Er EINVAL
Argument
.Ar encodedname
was not a valid encoded name.
.It Bq Er ENAMETOOLONG
The output buffer specified by arguments
.Ar buffer
and
.Ar bufsize
was too small to hold the decoded function prototype.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_strptr 3