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/* $Id: Iconv.xs,v 1.9 2001/08/11 10:10:04 mxp Exp $ */
/* XSUB for Perl module Text::Iconv */
/* Copyright (c) 2000 Michael Piotrowski */
#ifdef __cplusplus
extern "C" {
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef __cplusplus
}
#endif
#include <iconv.h>
/*****************************************************************************/
static int raise_error = 0;
SV *do_conv(iconv_t iconv_handle, SV *string)
{
char *ibuf; /* char* to the content of SV *string */
char *obuf; /* temporary output buffer */
size_t inbytesleft; /* no. of bytes left to convert; initially
this is the length of the input string,
and 0 when the conversion has finished */
size_t outbytesleft; /* no. of bytes in the output buffer */
size_t l_obuf; /* length of the output buffer */
char *icursor; /* current position in the input buffer */
/* The Single UNIX Specification (version 1 and version 2), as well
as the HP-UX documentation from which the XPG iconv specs are
derived, are unclear about the type of the second argument to
iconv() (here called icursor): The manpages say const char **,
while the header files say char **. */
char *ocursor; /* current position in the output buffer */
size_t ret; /* iconv() return value */
SV *perl_str; /* Perl return string */
/* Check if the input string is actually `defined'; otherwise
simply return undef. This is not considered an error. */
if (! SvOK(string))
{
return(&PL_sv_undef);
}
perl_str = newSVpv("", 0);
/* Get length of input string. That's why we take an SV* instead
of a char*: This way we can convert UCS-2 strings because we
know their length. */
inbytesleft = SvCUR(string);
ibuf = SvPV(string, inbytesleft);
/* Calculate approximate amount of memory needed for the temporary
output buffer and reserve the memory. The idea is to choose it
large enough from the beginning to reduce the number of copy
operations when converting from a single-byte to a multibyte
encoding. */
if(inbytesleft <= MB_LEN_MAX)
{
outbytesleft = MB_LEN_MAX + 1;
}
else
{
outbytesleft = 2 * inbytesleft;
}
l_obuf = outbytesleft;
obuf = (char *) New(0, obuf, outbytesleft, char); /* Perl malloc */
/**************************************************************************/
icursor = ibuf;
ocursor = obuf;
/**************************************************************************/
while(inbytesleft != 0)
{
#ifdef __hpux
/* Even in HP-UX 11.00, documentation and header files do not agree */
ret = iconv(iconv_handle, &icursor, &inbytesleft,
&ocursor, &outbytesleft);
#else
ret = iconv(iconv_handle, (const char **)&icursor, &inbytesleft,
&ocursor, &outbytesleft);
#endif
if(ret == (size_t) -1)
{
switch(errno)
{
case EILSEQ:
/* Stop conversion if input character encountered which
does not belong to the input char set */
if (raise_error)
croak("Character not from source char set: %s",
strerror(errno));
Safefree(obuf);
return(&PL_sv_undef);
case EINVAL:
/* Stop conversion if we encounter an incomplete
character or shift sequence */
if (raise_error)
croak("Incomplete character or shift sequence: %s",
strerror(errno));
Safefree(obuf);
return(&PL_sv_undef);
case E2BIG:
/* If the output buffer is not large enough, copy the
converted bytes to the return string, reset the
output buffer and continue */
sv_catpvn(perl_str, obuf, l_obuf - outbytesleft);
ocursor = obuf;
outbytesleft = l_obuf;
break;
default:
if (raise_error)
croak("iconv error: %s", strerror(errno));
Safefree(obuf);
return(&PL_sv_undef);
}
}
}
/* Copy the converted bytes to the return string, and free the
output buffer */
sv_catpvn(perl_str, obuf, l_obuf - outbytesleft);
Safefree(obuf); /* Perl malloc */
return perl_str;
}
typedef iconv_t Text__Iconv;
/*****************************************************************************/
/* Perl interface */
MODULE = Text::Iconv PACKAGE = Text::Iconv
PROTOTYPES: ENABLE
int
raise_error(...)
CODE:
if (items > 0 && SvIOK(ST(0))) /* if called as function */
raise_error = SvIV(ST(0));
if (items > 1 && SvIOK(ST(1))) /* if called as class method */
raise_error = SvIV(ST(1));
RETVAL = raise_error;
OUTPUT:
RETVAL
Text::Iconv
new(self, fromcode, tocode)
char *fromcode
char *tocode
CODE:
if((RETVAL = iconv_open(tocode, fromcode)) == (iconv_t)-1)
{
switch(errno)
{
case ENOMEM:
croak("Insufficient memory to initialize conversion: %s",
strerror(errno));
case EINVAL:
croak("Unsupported conversion: %s", strerror(errno));
default:
croak("Couldn't initialize conversion: %s", strerror(errno));
}
}
OUTPUT:
RETVAL
SV*
convert(self, string)
Text::Iconv self
SV *string
CODE:
RETVAL = do_conv(self, string);
OUTPUT:
RETVAL
void
DESTROY(self)
Text::Iconv self
CODE:
/* printf("Now in Text::Iconv::DESTROY\n"); */
(void) iconv_close(self);
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