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|
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: utf8.c 1184 2008-12-16 23:52:15Z hubert@u.washington.edu $";
#endif
/*
* ========================================================================
* Copyright 2013-2018 Eduardo Chappa
* Copyright 2006-2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
/* includable WITHOUT dependency on c-client */
#include "../../c-client/mail.h"
#include "../../c-client/utf8.h"
#ifdef _WINDOWS
/* wingdi.h uses ERROR (!) and we aren't using the c-client ERROR so... */
#undef ERROR
#else
#define _XOPEN_SOURCE
#endif
#include <system.h>
#include "../../c-client/fs.h"
/* includable WITHOUT dependency on pico */
#include "../../pico/keydefs.h"
#include "../osdep/collate.h"
#include "../filttype.h"
#include "utf8.h"
#include <stdarg.h>
unsigned single_width_chars_a_to_b(UCS *, int, int);
static char locale_charmap[50];
static int native_utf8;
static void *display_data;
void
init_utf8_display(int utf8, void *rmap)
{
native_utf8 = utf8;
display_data = rmap;
}
/*
* Argument is a UCS-4 wide character.
* Returns the environment dependent cell width of the
* character when printed to the screen.
* This will be -1 if the character is not printable.
* It will be >= zero if it is printable.
*
* Note that in the case it is not printable but it is still sent to
* Writechar, Writechar will print a '?' with width 1.
*/
int
wcellwidth(UCS ucs)
{
char dummy[32];
long w;
/*
* We believe that on modern unix systems wchar_t is a UCS-4 character.
* That's the assumption here.
*/
if(native_utf8){ /* display is UTF-8 capable */
w = ucs4_width((unsigned long) ucs);
return((w & U4W_ERROR) ? -1 : w);
}
else if(display_data){
if(wtomb(dummy, ucs) < 0)
return(-1);
else{
w = ucs4_width((unsigned long) ucs);
return((w & U4W_ERROR) ? -1 : w);
}
}
#if !defined(_WINDOWS) && HAVE_WCWIDTH
else
return(wcwidth((wchar_t) ucs));
#else
return(0);
#endif
}
/* ambiguous width zone character function. We use the Windows code until
* we find a better way to do it in general.
*/
int
pith_ucs4width(UCS ucs)
{
return (ucs >= 0x2100) ? 2 : 1;
#if !defined(_WINDOWS) && HAVE_WCWIDTH
return wcwidth((wchar_t) ucs);
#else
return (ucs >= 0x2100) ? 2 : 1;
#endif /* _WINDOWS */
}
/*
* Argument is a UCS-4 wide character.
* It is converted to the multibyte version (for example UTF8 or EUC-JP).
* Dest is a buffer at least xx chars wide where the multi-byte version
* of the wide character will be written.
* The returned value is the number of bytes written to dest or -1
* if the conversion can't be done.
*/
int
wtomb(char *dest, UCS ucs)
{
/*
* We believe that on modern unix systems wchar_t is a UCS-4 character.
* That's the assumption here.
*/
if(native_utf8){
unsigned char *newdptr;
newdptr = utf8_put((unsigned char *) dest, (unsigned long) ucs);
return((newdptr == (unsigned char *) dest) ? -1 : newdptr - (unsigned char *) dest);
}
else if(display_data){
unsigned long ucs4;
int ret;
ucs4 = (unsigned long) ucs;
ret = ucs4_rmaplen(&ucs4, 1, (unsigned short *) display_data, 0);
if(ret >= 0)
ucs4_rmapbuf((unsigned char *) dest, &ucs4, 1, (unsigned short *) display_data, 0);
else
ret = -1;
return(ret);
}
else
return(wcrtomb(dest, (wchar_t) ucs, NULL));
}
/*
* This function does not necessarily update inputp and remaining_octets, so
* don't rely on that. The c-client version does but the other doesn't.
*/
UCS
mbtow(void *input_cs, unsigned char **inputp, unsigned long *remaining_octets)
{
UCS ucs;
if(input_cs){
CHARSET *cast_input_cs;
cast_input_cs = (CHARSET *) input_cs;
switch((ucs = (UCS) ucs4_cs_get(cast_input_cs, inputp, remaining_octets))){
case U8G_ENDSTRG:
case U8G_ENDSTRI:
return(CCONV_NEEDMORE);
default:
if(ucs & U8G_ERROR || ucs == UBOGON)
return(CCONV_BADCHAR);
return(ucs);
}
}
else{
size_t ret;
wchar_t w;
/*
* Warning: input_cs and remaining_octets are unused in this
* half of the if/else.
*
* Unfortunately, we can't tell the difference between a source string
* that is just not long enough and one that has characters that can't
* be converted even though it is long enough. We return NEEDMORE in both cases.
*/
ret = mbstowcs(&w, (char *) (*inputp), 1);
if(ret == (size_t)(-1))
return(CCONV_NEEDMORE);
else{
ucs = (UCS) w;
return(ucs);
}
}
}
void
set_locale_charmap(char *charmap)
{
if(charmap){
strncpy(locale_charmap, charmap, sizeof(locale_charmap));
locale_charmap[sizeof(locale_charmap)-1] = '\0';
}
else
locale_charmap[0] = '\0';
}
/*
* This ensures that the string is UTF-8. If str is already a UTF-8 string,
* NULL is returned. Otherwise, an allocated string which is UTF-8 is returned.
* The caller is responsible for freeing the returned value.
*
* Args str -- the string to convert
*/
char *
convert_to_utf8(char *str, char *fromcharset, int flags)
{
char *ret = NULL;
char *fcharset;
SIZEDTEXT src, result;
const CHARSET *cs;
int try;
src.data = (unsigned char *) str;
src.size = strlen(str);
/* already UTF-8, return NULL */
if(!(flags & CU8_NOINFER)
&& (cs = utf8_infercharset(&src))
&& (cs->type == CT_ASCII || cs->type == CT_UTF8))
return(ret);
try = 1;
while(try < 5){
switch(try){
case 1:
fcharset = fromcharset;
if(fcharset && strucmp("UTF-8", fcharset) != 0)
break; /* give it a try */
else
try++; /* fall through */
case 2:
if(!(flags & CU8_NOINFER)){
fcharset = cs ? cs->name : NULL;
if(fcharset && strucmp("UTF-8", fcharset) != 0)
break;
else
try++; /* fall through */
}
else
try++; /* fall through */
case 3:
fcharset = locale_charmap;
if(fcharset && strucmp("UTF-8", fcharset) != 0)
break;
else
try++; /* fall through */
default:
fcharset = "ISO-8859-1"; /* this will "work" */
break;
}
memset(&result, 0, sizeof(result));
if(fcharset && utf8_text(&src, fcharset, &result, 0L)){
if(!(result.size == src.size && result.data == src.data)){
ret = (char *) fs_get((result.size+1) * sizeof(char));
strncpy(ret, (char *) result.data, result.size);
ret[result.size] = '\0';
}
/* else no conversion necessary */
if(result.data)
fs_give((void **) &result.data);
result.size = 0;
return(ret);
}
try++;
}
/* won't make it to here */
return(ret);
}
/*
* Convert from UTF-8 to user's locale charset.
* This actually uses the wtomb routine to do the conversion, and that
* relies on setup_for_input_output having been called.
* If no conversion is necessary, NULL is returned, otherwise an allocated
* string in the locale charset is returned and the caller is responsible
* for freeing it.
*/
char *
convert_to_locale(char *utf8str)
{
#define CHNK 500
char *inp, *retp, *ret = NULL;
CBUF_S cb;
int r, alloced;
if(native_utf8 || !utf8str || !utf8str[0])
return(NULL);
cb.cbuf[0] = '\0';
cb.cbufp = cb.cbufend = cb.cbuf;
inp = utf8str;
alloced = CHNK;
ret = (char *) fs_get(alloced * sizeof(char));
retp = ret;
/*
* There's gotta be a better way to do this but utf8_to_locale was
* available and everything looks like a nail when all you have
* is a hammer.
*/
while(*inp){
/*
* We're placing the outgoing stream of characters in ret, a multi-byte
* array of characters in the user's locale charset. See if there is
* enough room for the next wide characters worth of output chars
* and allocate more space if not.
*/
if((alloced - (retp-ret)) < MAX(MB_LEN_MAX,32)){
alloced += CHNK;
fs_resize((void **) &ret, alloced * sizeof(char));
}
r = utf8_to_locale((int) *inp++, &cb,
(unsigned char *) retp, alloced-(retp-ret));
retp += r;
}
*retp = '\0';
fs_resize((void **) &ret, strlen(ret)+1);
return(ret);
}
/*
* Pass in a stream of UTF-8 characters in 'c' and return obuf
* filled in with multi-byte characters. The return value is the
* number of valid characters in obuf to be used.
*/
int
utf8_to_locale(int c, CBUF_S *cb, unsigned char obuf[], size_t obuf_size)
{
int outchars = 0;
if(!(cb && cb->cbufp))
return(0);
if(cb->cbufp < cb->cbuf+sizeof(cb->cbuf)){
unsigned char *inputp;
unsigned long remaining_octets;
UCS ucs;
*(cb->cbufp)++ = (unsigned char) c;
inputp = cb->cbuf;
remaining_octets = (cb->cbufp - cb->cbuf) * sizeof(unsigned char);
ucs = (UCS) utf8_get(&inputp, &remaining_octets);
switch(ucs){
case U8G_ENDSTRG: /* incomplete character, wait */
case U8G_ENDSTRI: /* incomplete character, wait */
break;
default:
if(ucs & U8G_ERROR || ucs == UBOGON){
/*
* None of these cases is supposed to happen. If it
* does happen then the input stream isn't UTF-8
* so something is wrong. Treat each character in the
* input buffer as a separate error character and
* print a '?' for each.
*/
for(inputp = cb->cbuf; inputp < cb->cbufp; inputp++)
obuf[outchars++] = '?';
cb->cbufp = cb->cbuf;
}
else{
if(ucs >= 0x80 && wcellwidth(ucs) < 0){
/*
* This happens when we have a UTF-8 character that
* we aren't able to print in our locale. For example,
* if the locale is setup with the terminal
* expecting ISO-8859-1 characters then there are
* lots of UTF-8 characters that can't be printed.
* Print a '?' instead.
*/
obuf[outchars++] = '?';
}
else{
/*
* Convert the ucs into the multibyte
* character that corresponds to the
* ucs in the users locale.
*/
outchars = wtomb((char *) obuf, ucs);
if(outchars < 0){
obuf[0] = '?';
outchars = 1;
}
}
/* update the input buffer */
if(inputp >= cb->cbufp) /* this should be the case */
cb->cbufp = cb->cbuf;
else{ /* extra chars for some reason? */
unsigned char *q, *newcbufp;
newcbufp = (cb->cbufp - inputp) + cb->cbuf;
q = cb->cbuf;
while(inputp < cb->cbufp)
*q++ = *inputp++;
cb->cbufp = newcbufp;
}
}
break;
}
}
else{ /* error */
obuf[0] = '?';
outchars = 1;
cb->cbufp = cb->cbuf; /* start over */
}
return(outchars);
}
/*
* Returns the screen cells width of the UCS-4 string argument.
* The source string is zero terminated.
*/
unsigned
ucs4_str_width(UCS *ucsstr)
{
unsigned width = 0;
int w;
if(ucsstr)
while(*ucsstr){
w = wcellwidth(*ucsstr++);
if(w != U4W_CTLSRGT)
width += (w < 0 ? 1 : w);
}
return width;
}
/*
* Returns the screen cells width of the UCS-4 string argument
* from ucsstr[a] through (inclusive) ucsstr[b].
* No checking is done to make sure a starts in the middle
* of a UCS-4 array.
*/
unsigned
ucs4_str_width_a_to_b(UCS *ucsstr, int a, int b)
{
unsigned width = 0;
int i, w;
if(ucsstr)
for(i = a; i <= b && ucsstr[i]; i++){
w = wcellwidth(ucsstr[i]);
if(w != U4W_CTLSRGT)
width += (w < 0 ? 1 : w);
}
return width;
}
/*
* Returns the screen cells width of the UCS-4 string argument
* from ustart through (exclusive) uend.
* No checking is done to make sure it starts in the middle
* of a UCS-4 array.
*/
unsigned
ucs4_str_width_ptr_to_ptr(UCS *ustart, UCS *uend)
{
UCS *u;
unsigned width = 0;
int w;
if(!ustart)
return width;
if(ustart)
for(u = ustart; u < uend; u++){
w = wcellwidth(*u);
if(w != U4W_CTLSRGT)
width += (w < 0 ? 1 : w);
}
return(width);
}
/*
* Return the largest possible pointer into ucs4str so that the width
* of the string from ucs4str to the pointer (exclusive)
* is maxwidth or less. Also stops at a null character.
*/
UCS *
ucs4_particular_width(UCS *ucs4str, int maxwidth)
{
UCS *u;
int w_consumed = 0, w, done = 0;
u = ucs4str;
if(u)
while(!done && *u && w_consumed <= maxwidth){
w = wcellwidth(*u);
w = (w >= 0 ? w : 1);
if(w_consumed + w <= maxwidth){
w_consumed += w;
++u;
}
else
++done;
}
return(u);
}
/*
* Convert and copy a UTF-8 string into a UCS-4 NULL
* terminated array. Just like cpystr only it converts
* from UTF-8 to UCS-4.
*
* Returned UCS-4 string needs to be freed by caller.
*/
UCS *
utf8_to_ucs4_cpystr(char *utf8src)
{
size_t retsize;
UCS *ret = NULL;
UCS ucs;
unsigned long remaining_octets;
unsigned char *readptr;
size_t arrayindex;
/*
* We don't know how big to allocate the return array
* because variable numbers of octets in the src array
* will combine to make UCS-4 characters. The number of
* UCS-4 characters is less than or equal to the number
* of src characters, though.
*/
if(!utf8src)
return NULL;
retsize = strlen(utf8src) + 1;
ret = (UCS *) fs_get(retsize * sizeof(*ret));
memset(ret, 0, retsize * sizeof(*ret));
readptr = (unsigned char *) utf8src;
remaining_octets = retsize-1;
arrayindex = 0;
while(remaining_octets > 0 && *readptr && arrayindex < retsize-1){
ucs = (UCS) utf8_get(&readptr, &remaining_octets);
if(ucs & U8G_ERROR || ucs == UBOGON)
remaining_octets = 0;
else
ret[arrayindex++] = ucs;
}
ret[arrayindex] = '\0';
/* get rid of excess size */
if(arrayindex+1 < retsize)
fs_resize((void **) &ret, (arrayindex + 1) * sizeof(*ret));
return ret;
}
/*
* Convert and copy a UCS-4 zero-terminated array into a UTF-8 NULL
* terminated string. Just like cpystr only it converts
* from UCS-4 to UTF-8.
*
* Returned UTF-8 string needs to be freed by caller.
*/
char *
ucs4_to_utf8_cpystr(UCS *ucs4src)
{
unsigned char *ret = NULL;
unsigned char *writeptr;
int i;
if(!ucs4src)
return NULL;
/*
* Over-allocate and then resize at the end.
*/
/* count characters in source */
for(i = 0; ucs4src[i]; i++)
;
ret = (unsigned char *) fs_get((6*i + 1) * sizeof(*ret));
memset(ret, 0, (6*i + 1) * sizeof(*ret));
writeptr = ret;
for(i = 0; ucs4src[i]; i++)
writeptr = utf8_put(writeptr, (unsigned long) ucs4src[i]);
/* get rid of excess size */
fs_resize((void **) &ret, (writeptr - ret + 1) * sizeof(*ret));
return ((char *) ret);
}
/*
* Similar to above but copy a fixed number of source
* characters instead of going until null terminator.
*/
char *
ucs4_to_utf8_cpystr_n(UCS *ucs4src, int ucs4src_len)
{
unsigned char *ret = NULL;
unsigned char *writeptr;
int i;
if(!ucs4src)
return NULL;
/*
* Over-allocate and then resize at the end.
*/
ret = (unsigned char *) fs_get((6*ucs4src_len + 1) * sizeof(*ret));
memset(ret, 0, (6*ucs4src_len + 1) * sizeof(*ret));
writeptr = ret;
for(i = 0; i < ucs4src_len; i++)
writeptr = utf8_put(writeptr, (unsigned long) ucs4src[i]);
/* get rid of excess size */
fs_resize((void **) &ret, (writeptr - ret + 1) * sizeof(*ret));
return ((char *) ret);
}
#ifdef _WINDOWS
/*
* Convert a UTF-8 argument into an LPTSTR version
* of that argument. The result is allocated here
* and should be freed by the caller.
*/
LPTSTR
utf8_to_lptstr(LPSTR arg_utf8)
{
int lptstr_len;
LPTSTR lptstr_ret = NULL;
lptstr_len = MultiByteToWideChar( CP_UTF8, 0, arg_utf8, -1, NULL, 0 );
if(lptstr_len > 0)
{
lptstr_ret = (LPTSTR)fs_get(lptstr_len * sizeof(TCHAR));
lptstr_len = MultiByteToWideChar( CP_UTF8, 0,
arg_utf8, -1, lptstr_ret, lptstr_len );
}
if(!lptstr_len)
{
/* check GetLastError()? */
lptstr_ret = (LPTSTR)fs_get(sizeof(TCHAR));
lptstr_ret[0] = 0;
}
return lptstr_ret;
}
/*
* Convert an LPTSTR argument into a UTF-8 version
* of that argument. The result is allocated here
* and should be freed by the caller.
*/
LPSTR
lptstr_to_utf8(LPTSTR arg_lptstr)
{
int utf8str_len;
LPSTR utf8str_ret = NULL;
utf8str_len = WideCharToMultiByte( CP_UTF8, 0, arg_lptstr, -1, NULL, 0, NULL, NULL );
if(utf8str_len > 0)
{
utf8str_ret = (LPSTR)fs_get(utf8str_len * sizeof(CHAR));
utf8str_len = WideCharToMultiByte( CP_UTF8, 0,
arg_lptstr, -1, utf8str_ret, utf8str_len, NULL, NULL );
}
if(!utf8str_len)
{
/* check GetLastError()? */
utf8str_ret = (LPSTR)fs_get(sizeof(CHAR));
utf8str_ret[0] = 0;
}
return utf8str_ret;
}
/*
* Convert a UCS4 argument into an LPTSTR version
* of that argument. The result is allocated here
* and should be freed by the caller.
*/
LPTSTR
ucs4_to_lptstr(UCS *arg_ucs4)
{
LPTSTR ret_lptstr = NULL;
size_t len;
size_t i;
if(arg_ucs4){
len = ucs4_strlen(arg_ucs4);
ret_lptstr = (LPTSTR) fs_get((len+1) * sizeof(TCHAR));
/* bogus conversion ignores UTF-16 */
for(i = 0; i < len; i++)
ret_lptstr[i] = arg_ucs4[i];
ret_lptstr[len] = '\0';
}
return(ret_lptstr);
}
/*
* Convert an LPTSTR argument into a UCS4 version
* of that argument. The result is MemAlloc'd here
* and should be freed by the caller.
*/
UCS *
lptstr_to_ucs4(LPTSTR arg_lptstr)
{
UCS *ret_ucs4 = NULL;
size_t len;
size_t i;
if(arg_lptstr){
len = _tcslen(arg_lptstr);
ret_ucs4 = (UCS *) fs_get((len+1)*sizeof(UCS));
/* bogus conversion ignores UTF-16 */
for(i = 0; i < len; i++)
ret_ucs4[i] = arg_lptstr[i];
ret_ucs4[len] = '\0';
}
return(ret_ucs4);
}
#endif /* _WINDOWS */
/*
* Pass in a stream of UTF-8 characters 1-at-a-time in 'c' and return obuf
* 1-at-a-time filled in with UCS characters. The return value is the
* number of valid characters in obuf to be used. It can only
* be 1 or 0 characters since we're only getting one UTF-8 character
* at a time.
*/
int
utf8_to_ucs4_oneatatime(int c, CBUF_S *cb, UCS *obuf, int *obufwidth)
{
int width = 0, outchars = 0;
if(!(cb && cb->cbufp))
return(0);
if(cb->cbufp < cb->cbuf+sizeof(cb->cbuf)){
unsigned char *inputp;
unsigned long remaining_octets;
UCS ucs;
*cb->cbufp++ = (unsigned char) c;
inputp = cb->cbuf;
remaining_octets = (cb->cbufp - cb->cbuf) * sizeof(unsigned char);
ucs = (UCS) utf8_get(&inputp, &remaining_octets);
switch(ucs){
case U8G_ENDSTRG: /* incomplete character, wait */
case U8G_ENDSTRI: /* incomplete character, wait */
break;
default:
if(ucs & U8G_ERROR || ucs == UBOGON){
/*
* None of these cases is supposed to happen. If it
* does happen then the input stream isn't UTF-8
* so something is wrong.
*/
outchars++;
*obuf = '?';
cb->cbufp = cb->cbuf;
width = 1;
}
else{
outchars++;
if(ucs < 0x80 && ucs >= 0x20)
width = 1;
if(ucs >= 0x80 && (width=wcellwidth(ucs)) < 0){
/*
* This happens when we have a UTF-8 character that
* we aren't able to print in our locale. For example,
* if the locale is setup with the terminal
* expecting ISO-8859-1 characters then there are
* lots of UTF-8 characters that can't be printed.
* Print a '?' instead.
* Don't think this should happen in Windows.
*/
*obuf = '?';
}
else{
*obuf = ucs;
}
/* update the input buffer */
if(inputp >= cb->cbufp) /* this should be the case */
cb->cbufp = cb->cbuf;
else{ /* extra chars for some reason? */
unsigned char *q, *newcbufp;
newcbufp = (cb->cbufp - inputp) + cb->cbuf;
q = cb->cbuf;
while(inputp < cb->cbufp)
*q++ = *inputp++;
cb->cbufp = newcbufp;
}
}
break;
}
}
else{ /* error */
*obuf = '?';
outchars = 1;
width = 1;
cb->cbufp = cb->cbuf; /* start over */
}
if(obufwidth)
*obufwidth = width;
return(outchars);
}
/*
* Return an allocated copy of a zero-terminated UCS-4 string.
*/
UCS *
ucs4_cpystr(UCS *ucs4src)
{
size_t arraysize;
UCS *ret = NULL;
size_t i;
if(!ucs4src)
return NULL;
arraysize = ucs4_strlen(ucs4src);
ret = (UCS *) fs_get((arraysize+1) * sizeof(*ret));
memset(ret, 0, (arraysize+1) * sizeof(*ret));
for(i = 0; i < arraysize; i++)
ret[i] = ucs4src[i];
return ret;
}
UCS *
ucs4_strncpy(UCS *ucs4dst, UCS *ucs4src, size_t n)
{
size_t i;
if(ucs4src && ucs4dst){
for(i = 0; i < n; i++){
ucs4dst[i] = ucs4src[i];
if(ucs4dst[i] == '\0')
break;
}
}
return ucs4dst;
}
UCS *
ucs4_strncat(UCS *ucs4dst, UCS *ucs4src, size_t n)
{
size_t i;
UCS *u;
if(ucs4src && ucs4dst){
for(u = ucs4dst; *u; u++)
;
for(i = 0; i < n; i++){
u[i] = ucs4src[i];
if(u[i] == '\0')
break;
}
if(i == n)
u[i] = '\0';
}
return ucs4dst;
}
/*
* Like strlen only this returns the number of non-zero characters
* in a zero-terminated UCS-4 array.
*/
size_t
ucs4_strlen(UCS *ucs4str)
{
size_t i = 0;
if(ucs4str)
while(ucs4str[i])
i++;
return(i);
}
int
ucs4_strcmp(UCS *s1, UCS *s2)
{
for(; *s1 == *s2; s1++, s2++)
if(*s1 == '\0')
return 0;
return((*s1 < *s2) ? -1 : 1);
}
UCS *
ucs4_strchr(UCS *s, UCS c)
{
if(!s)
return NULL;
while(*s && *s != c)
s++;
if(*s || !c)
return s;
else
return NULL;
}
UCS *
ucs4_strrchr(UCS *s, UCS c)
{
UCS *ret = NULL;
if(!s)
return ret;
while(*s){
if(*s == c)
ret = s;
s++;
}
return ret;
}
/*
* Returns the screen cells width of the UTF-8 string argument.
*/
unsigned
utf8_width(char *str)
{
unsigned width = 0;
int this_width;
UCS ucs;
unsigned long remaining_octets;
char *readptr;
if(!(str && *str))
return(width);
readptr = str;
remaining_octets = readptr ? strlen(readptr) : 0;
while(remaining_octets > 0 && *readptr){
ucs = (UCS) utf8_get((unsigned char **) &readptr, &remaining_octets);
if(ucs & U8G_ERROR || ucs == UBOGON){
/*
* This should not happen, but do something to handle it anyway.
* Treat each character as a single width character, which is what should
* probably happen when we actually go to write it out.
*/
remaining_octets--;
readptr++;
this_width = 1;
}
else{
this_width = wcellwidth(ucs);
/*
* If this_width is -1 that means we can't print this character
* with our current locale. Writechar will print a '?'.
*/
if(this_width < 0)
this_width = 1;
}
width += (unsigned) this_width;
}
return(width);
}
/*
* Copy UTF-8 characters from src into dst.
* This is intended to be used if you want to truncate a string at
* the start instead of the end. For example, you have a long string
* like
* this_is_a_long_string
* but not enough space to fit it into a particular field. You want to
* end up with
* s_a_long_string
* where that fits in a particular width. Perhaps you'd use this with ...
* to get
* ...s_a_long_string
* This right adjusts the end of the string in the width space and
* cuts it off at the start. If there is enough width for the whole
* string it will copy the string into dst with no padding.
*
* Copy enough characters so that the result will have screen width of
* want_width screen cells in current locale.
*
* Dstlen is the available space in dst. No more than dstlen bytes will be written
* to dst. This is just for protection, it shouldn't be relied on to
* do anything useful. Dstlen should be large enough. Otherwise you'll get
* characters truncated in the middle or something like that.
*
* Returned value is the number of bytes written to dst, not including
* the possible terminating null.
*
* If we can't hit want_width exactly because of double width characters
* then we will pad the end of the string with space in order to make
* the width exact.
*/
size_t
utf8_to_width_rhs(char *dst, /* destination buffer */
char *src, /* source string */
size_t dstlen, /* space in dest */
unsigned want_width) /* desired screen width */
{
int this_width;
unsigned width_consumed = 0;
UCS ucs;
unsigned long remaining_octets;
char *readptr, *goodreadptr, *savereadptr, *endptr;
size_t nb = 0;
if(!src){
if(dstlen > 0)
dst[0] = '\0';
return nb;
}
/*
* Start at the end of the source string and go backwards until we
* get to the desired width, but not more than the width.
*/
readptr = src + strlen(src);
endptr = readptr;
goodreadptr = readptr;
width_consumed = 0;
savereadptr = readptr;
for(readptr = savereadptr-1; readptr >= src && width_consumed < want_width && (endptr - readptr) < dstlen;
readptr = savereadptr-1){
savereadptr = readptr;
remaining_octets = goodreadptr - readptr;
ucs = (UCS) utf8_get((unsigned char **) &readptr, &remaining_octets);
/*
* Handling the error case is tough because an error will be the normal thing that
* happens as we back through the string. So we're just going to punt on the
* error for now.
*/
if(!(ucs & U8G_ERROR || ucs == UBOGON)){
if(remaining_octets > 0){
/*
* This means there are some bad octets after this good
* character so things are not going to work out well.
* Bail out.
*/
savereadptr = src; /* we're done */
}
else{
this_width = wcellwidth(ucs);
if(this_width < 0)
this_width = 1;
if(width_consumed + (unsigned) this_width <= want_width){ /* ok */
width_consumed += (unsigned) this_width;
goodreadptr = savereadptr;
}
else
savereadptr = src; /* we're done */
}
}
}
/*
* Copy characters from goodreadptr to endptr into dst.
*/
nb = MIN(endptr-goodreadptr, dstlen-1);
strncpy(dst, goodreadptr, nb);
dst[nb] = '\0';
/*
* Pad out with spaces in order to hit width exactly.
*/
while(width_consumed < want_width && nb < dstlen-1){
dst[nb++] = ' ';
dst[nb] = '\0';
width_consumed++;
}
return nb;
}
/*
* The arguments being converted are UTF-8 strings.
* This routine attempts to make it possible to use screen cell
* widths in a format specifier. In a one-byte per screen cell
* world we might have used %10.10s to cause a string to occupy
* 10 screen positions. Since the width and precision are really
* referring to numbers of bytes instead of screen positions that
* won't work with UTF-8 input. We emulate that behavior with
* the format string %w. %m.nw means to use the m and n as
* screen width indicators instead of bytes indicators.
*
* There is no reason to use this routine unless you want to use
* min field with or precision with the specifier. A plain %w without
* widths is equivalent exactly to a plain %s in a regular printf.
*
* Double-width characters complicate things. It may not be possible
* to satisfy the request exactly. For example, %3w for an input
* string that is made up of two double-width characters.
* This routine will arbitrarily use a trailing space character if
* needed to make the width come out correctly where a half of a
* double-width character would have been needed. We'll see how
* that works for us.
*
* %w only works for strings (it's a %s replacement).
*
* Buffer overflow is handled by the size argument. %.30s will work
* to limit a particular string to 30 bytes, but you lose that
* ability with %w, since it may write more than precision bytes
* in order to get to the desired width. It is best to choose
* size large enough so that it doesn't come into play, otherwise
* it may be possible to get partial UTF-8 characters because of
* the truncation.
*
* The return value isn't quite the same as the return value
* of snprintf. It is the number of bytes written, not counting
* the trailing null, just like snprintf. However, if it is
* truncated due to size then the output is size, not the
* number of characters that would have been written.
*/
int
utf8_snprintf(char *dest, size_t size, char *fmt, ...)
{
char newfmt[100], buf[20], *q, *pdest, *width_str, *end;
char *start_of_specifier;
char *input_str;
int int_arg;
double double_arg;
void *ptr_arg;
unsigned got_width;
int more_flags, ret, w;
int min_field_width, field_precision, modifier;
int flags_minus, flags_plus, flags_space, flags_zero, flags_pound;
va_list args;
newfmt[0] = '\0';
q = newfmt;
pdest = dest;
#define IS_ROOM_IN_DEST(n_more_chars) \
((pdest - dest + (n_more_chars) <= size) ? 1 : 0)
/*
* Strategy: Look through the fmt string for %w's. Replace the
* %w's in the format string with %s's but with possibly different
* width and precision arguments which will make it come out right.
* Then call the regular system vsnprintf with the altered format
* string but same arguments.
*
* That would be nice but it doesn't quite work. Why? Because a
* %*w will need to have the value in the integer argument the *
* refers to modified. Can't do it as far as I can tell. Or we could
* remove the integer argument somehow before calling printf. Can't
* do it. Or we could somehow add an additional conversion specifier
* that caused nothing to be printed but ate up the integer arg.
* Can't figure out how to do that either.
*
* Since we can't figure out how to do it, the alternative is to
* construct the result one piece at a time, pasting together the
* pieces from the different conversions.
*/
va_start(args, fmt);
while(*fmt && IS_ROOM_IN_DEST(1)){
if(*fmt == '%'){
start_of_specifier = fmt++;
min_field_width = field_precision = -1;
flags_minus = flags_plus = flags_space = flags_zero = flags_pound = 0;
/* flags */
more_flags = 1;
while(more_flags){
switch(*fmt){
case '-':
flags_minus++;
fmt++;
break;
case '+':
flags_plus++;
fmt++;
break;
case ' ':
flags_space++;
fmt++;
break;
case '0':
flags_zero++;
fmt++;
break;
case '#':
flags_pound++;
fmt++;
break;
default:
more_flags = 0;
break;
}
}
/* minimum field width */
if(*fmt == '*'){
min_field_width = va_arg(args, int);
fmt++;
}
else if(*fmt >= '0' && *fmt <= '9'){
width_str = fmt;
while (*fmt >= '0' && *fmt <= '9')
fmt++;
strncpy(buf, width_str, MIN(fmt-width_str,sizeof(buf)));
if(sizeof(buf) > fmt-width_str)
buf[fmt-width_str] = '\0';
buf[sizeof(buf)-1] = '\0';
min_field_width = atoi(width_str);
}
/* field precision */
if(*fmt == '.'){
fmt++;
if(*fmt == '*'){
field_precision = va_arg(args, int);
fmt++;
}
else if(*fmt >= '0' && *fmt <= '9'){
width_str = fmt;
while (*fmt >= '0' && *fmt <= '9')
fmt++;
strncpy(buf, width_str, MIN(fmt-width_str,sizeof(buf)));
if(sizeof(buf) > fmt-width_str)
buf[fmt-width_str] = '\0';
buf[sizeof(buf)-1] = '\0';
field_precision = atoi(width_str);
}
}
/* length modifier */
if(*fmt == 'h' || *fmt == 'l' || *fmt == 'L')
modifier = *fmt++;
/* conversion character */
switch(*fmt){
case 'w':
/*
* work with va_arg(char *) to figure out width
* and precision needed to produce the screen width
* and precision asked for in %w using some of the
* utf8 width routines we have.
*/
input_str = va_arg(args, char *);
if(field_precision >=0 || min_field_width >= 0)
w = utf8_width(input_str);
if(field_precision >= 0){
if(w <= field_precision)
field_precision = -1; /* print it all */
else{
/*
* We need to cut off some of the input_str
* in this case.
*/
end = utf8_count_forw_width(input_str, field_precision, &got_width);
field_precision = (int) (end - input_str);
/* new w with this field_precision */
w = got_width;
}
}
/* need some padding */
if(min_field_width >= 0)
min_field_width = ((field_precision >= 0) ? field_precision : strlen(input_str)) +
MAX(0, min_field_width - w);
/*
* Now we just need to get the new format string
* set correctly in newfmt.
*/
q = newfmt;
if(q-newfmt < sizeof(newfmt))
*q++ = '%';
if(flags_minus && q-newfmt < sizeof(newfmt))
*q++ = '-';
if(flags_plus && q-newfmt < sizeof(newfmt))
*q++ = '+';
if(flags_space && q-newfmt < sizeof(newfmt))
*q++ = ' ';
if(flags_zero && q-newfmt < sizeof(newfmt))
*q++ = '0';
if(flags_pound && q-newfmt < sizeof(newfmt))
*q++ = '#';
if(min_field_width >= 0){
snprintf(buf, sizeof(buf), "%d", min_field_width);
sstrncpy(&q, buf, sizeof(newfmt)-(q-newfmt));
}
if(field_precision >= 0){
if(q-newfmt < sizeof(newfmt))
*q++ = '.';
snprintf(buf, sizeof(buf), "%d", field_precision);
sstrncpy(&q, buf, sizeof(newfmt)-(q-newfmt));
}
if(q-newfmt < sizeof(newfmt))
*q++ = 's';
if(q-newfmt < sizeof(newfmt))
*q++ = '\0';
snprintf(pdest, size - (pdest-dest), newfmt, input_str);
pdest += strlen(pdest);
break;
case '\0':
fmt--;
break;
default:
/* make a new format which leaves out the dynamic '*' arguments */
q = newfmt;
if(q-newfmt < sizeof(newfmt))
*q++ = '%';
if(flags_minus && q-newfmt < sizeof(newfmt))
*q++ = '-';
if(flags_plus && q-newfmt < sizeof(newfmt))
*q++ = '+';
if(flags_space && q-newfmt < sizeof(newfmt))
*q++ = ' ';
if(flags_zero && q-newfmt < sizeof(newfmt))
*q++ = '0';
if(flags_pound && q-newfmt < sizeof(newfmt))
*q++ = '#';
if(min_field_width >= 0){
snprintf(buf, sizeof(buf), "%d", min_field_width);
sstrncpy(&q, buf, sizeof(newfmt)-(q-newfmt));
}
if(field_precision >= 0){
if(q-newfmt < sizeof(newfmt))
*q++ = '.';
snprintf(buf, sizeof(buf), "%d", field_precision);
sstrncpy(&q, buf, sizeof(newfmt)-(q-newfmt));
}
if(q-newfmt < sizeof(newfmt))
*q++ = *fmt;
if(q-newfmt < sizeof(newfmt))
*q++ = '\0';
switch(*fmt){
case 'd': case 'i': case 'o':
case 'x': case 'X': case 'u': case 'c':
int_arg = va_arg(args, int);
snprintf(pdest, size - (pdest-dest), newfmt, int_arg);
pdest += strlen(pdest);
break;
case 's':
input_str = va_arg(args, char *);
snprintf(pdest, size - (pdest-dest), newfmt, input_str);
pdest += strlen(pdest);
break;
case 'f': case 'e': case 'E':
case 'g': case 'G':
double_arg = va_arg(args, double);
snprintf(pdest, size - (pdest-dest), newfmt, double_arg);
pdest += strlen(pdest);
break;
case 'p':
ptr_arg = va_arg(args, void *);
snprintf(pdest, size - (pdest-dest), newfmt, ptr_arg);
pdest += strlen(pdest);
break;
case '%':
if(IS_ROOM_IN_DEST(1))
*pdest++ = '%';
break;
default:
/* didn't think of this type */
assert(0);
break;
}
break;
}
fmt++;
}
else{
if(IS_ROOM_IN_DEST(1))
*pdest++ = *fmt++;
}
}
ret = pdest - dest;
if(IS_ROOM_IN_DEST(1))
*pdest++ = '\0';
va_end(args);
return ret;
}
/*
* Copy UTF-8 characters from src into dst.
* Copy enough characters so that the result will have (<=) screen width of
* want_width screen cells in current locale.
*
* Dstlen is the available space in dst. No more than dstlen bytes will be written
* to dst.
*
* Returned value is the number of bytes written to dst, not including
* the possible terminating null.
* Got_width is another returned value. It is the width in screen cells of
* the string placed in dst. It will be the same as want_width if there
* are enough characters in the src to do that and if the character widths
* hit the width exactly. It will be less than want_width if we run out
* of src characters or if the next character width would skip over the
* width we want, because it is double width.
*
* Zero width characters are collected and included at the end of the string.
* That is, if we make it to want_width but there is still a zero length
* character sitting in src, we add that to dst. This might be an accent
* or something like that.
*/
size_t
utf8_to_width(char *dst, /* destination buffer */
char *src, /* source string */
size_t dstlen, /* space in dst */
unsigned want_width, /* desired screen width */
unsigned *got_width) /* returned screen width in dst */
{
int this_width;
unsigned width_consumed = 0;
UCS ucs;
unsigned long remaining_octets;
char *writeptr, *readptr, *savereadptr, *endptr;
int ran_out_of_space = 0;
readptr = src;
remaining_octets = readptr ? strlen(readptr) : 0;
writeptr = dst;
endptr = writeptr + dstlen;
if(readptr && writeptr){
while(width_consumed <= want_width && remaining_octets > 0 && writeptr < dst + dstlen && !ran_out_of_space){
savereadptr = readptr;
ucs = (UCS) utf8_get((unsigned char **) &readptr, &remaining_octets);
if(ucs & U8G_ERROR || ucs == UBOGON)
remaining_octets = 0;
else{
this_width = wcellwidth(ucs);
/*
* If this_width is -1 that means we can't print this character
* with our current locale. Writechar will print a '?'.
*/
if(this_width < 0)
this_width = 1;
if(width_consumed + (unsigned) this_width <= want_width){
/* append this utf8 character to dst if it will fit */
if(writeptr + (readptr - savereadptr) < endptr){
width_consumed += this_width;
while(savereadptr < readptr)
*writeptr++ = *savereadptr++;
}
else
ran_out_of_space++; /* no more utf8 to dst */
}
else
remaining_octets = 0; /* we're done */
}
}
if(writeptr < endptr)
*writeptr = '\0';
}
if(got_width)
*got_width = width_consumed;
return(writeptr ? (writeptr - dst) : 0);
}
/*
* Str is a UTF-8 string.
* Count forward width screencell positions and return a pointer to the
* end of the string that is width wide.
* The returned pointer points at the next character (where the null would
* be placed).
*
* Got_width is another returned value. It is the width in screen cells of
* the string from str to the returned pointer. It will be the same as
* want_width if there are enough characters in the str to do that
* and if the character widths hit the width exactly. It will be less
* than want_width if we run out of characters or if the next character
* width would skip over the width we want, because it is double width.
*/
char *
utf8_count_forw_width(char *str, unsigned want_width, unsigned *got_width)
{
int this_width;
unsigned width_consumed = 0;
UCS ucs;
unsigned long remaining_octets;
char *readptr;
char *retptr;
retptr = readptr = str;
remaining_octets = readptr ? strlen(readptr) : 0;
while(width_consumed <= want_width && remaining_octets > 0){
ucs = (UCS) utf8_get((unsigned char **) &readptr, &remaining_octets);
if(ucs & U8G_ERROR || ucs == UBOGON){
/*
* This should not happen, but do something to handle it anyway.
* Treat each character as a single width character, which is what should
* probably happen when we actually go to write it out.
*/
remaining_octets--;
readptr++;
this_width = 1;
}
else{
this_width = wcellwidth(ucs);
/*
* If this_width is -1 that means we can't print this character
* with our current locale. Writechar will print a '?'.
*/
if(this_width < 0)
this_width = 1;
}
if(width_consumed + (unsigned) this_width <= want_width){
width_consumed += (unsigned) this_width;
retptr = readptr;
}
else
remaining_octets = 0; /* we're done */
}
if(got_width)
*got_width = width_consumed;
return(retptr);
}
/*
* Copy a null terminator into a UTF-8 string in place so that the string is
* no more than a certain screen width wide. If the string is already less
* than or equal in width to the requested width, no change is made.
*
* The actual width accomplished is returned. Note that it may be less than
* max_width due to double width characters as well as due to the fact that
* it fits wholly in the max_width.
*
* Returned value is the actual screen width of str when done.
*
* A side effect is that a terminating null may have been written into
* the passed in string.
*/
unsigned
utf8_truncate(char *str, unsigned max_width)
{
int this_width;
unsigned width_consumed = 0;
UCS ucs;
unsigned long remaining_octets;
char *readptr, *savereadptr;
readptr = str;
remaining_octets = readptr ? strlen(readptr) : 0;
if(readptr){
while(width_consumed <= max_width && remaining_octets > 0){
savereadptr = readptr;
ucs = (UCS) utf8_get((unsigned char **) &readptr, &remaining_octets);
if(ucs & U8G_ERROR || ucs == UBOGON){
/*
* This should not happen, but do something to handle it anyway.
* Treat each character as a single width character, which is what should
* probably happen when we actually go to write it out.
*/
remaining_octets--;
readptr++;
this_width = 1;
}
else{
this_width = wcellwidth(ucs);
/*
* If this_width is -1 that means we can't print this character
* with our current locale. Writechar will print a '?'.
*/
if(this_width < 0)
this_width = 1;
}
if(width_consumed + (unsigned) this_width <= max_width){
width_consumed += (unsigned) this_width;
}
else{
remaining_octets = 0; /* we're done */
*savereadptr = '\0';
}
}
}
return(width_consumed);
}
/*
* Copy UTF-8 characters from src into dst.
* Copy enough characters so that the result will have screen width of
* want_width screen cells in current locale.
* If there aren't enough characters in src to get to want_width, pad on
* left or right according to left_adjust argument.
*
* Dstlen is the available space in dst. No more than dstlen bytes will be written
* to dst. Dst will be null terminated if there is enough room, but not
* if that would overflow dst's len.
*
* Returned value is the number of bytes written to dst, not including
* the possible terminating null.
*/
size_t
utf8_pad_to_width(char *dst, /* destination buffer */
char *src, /* source string */
size_t dstlen, /* space in dst */
unsigned want_width, /* desired screen width */
int left_adjust) /* adjust left or right in want_width columns */
{
unsigned got_width = 0;
int need_more, howmany;
size_t len_left, bytes_used;
bytes_used = utf8_to_width(dst, src, dstlen, want_width, &got_width);
len_left = dstlen - bytes_used;
need_more = want_width - got_width;
howmany = MIN(need_more, len_left);
if(howmany > 0){
char *end, *newend, *p, *q;
end = dst + bytes_used;
newend = end + howmany;
if(left_adjust){
/*
* Add padding to end of string. Simply append
* the needed number of spaces, or however many will fit
* if we don't have enough space.
*/
for(q = end; q < newend; q++)
*q = ' ';
}
else{
/*
* Add padding to start of string.
*/
/* slide existing string over */
for(p = end - 1, q = newend - 1; p >= dst; p--, q--)
*q = *p;
/* fill rest with spaces */
for(; q >= dst; q--)
*q = ' ';
}
bytes_used += howmany;
}
if(bytes_used < dstlen)
dst[bytes_used] = '\0';
return(bytes_used);
}
/*
* Str is a UTF-8 string.
* Start_here is a pointer into the string. It points one position past
* the last byte that should be considered a part of the length string.
* Count back want_width screencell positions and return a pointer to the
* start of the string that is want_width wide and ends with start_here.
*
* Since characters may be more than one cell width wide we may end up
* skipping over the exact width. That is, if we need to we'll go back
* too far (by one cell width). Account for that in the call by looking
* at got_width.
*
* Note that this call gives a possible got_width == want_width+1 as
* opposed to utf8_count_forw_width which gives got_width == want-1 instead.
* That was just what was needed at the time, maybe it needs to be
* optional.
*/
char *
utf8_count_back_width(char *str, char *start_here, unsigned want_width, unsigned *got_width)
{
unsigned width_consumed = 0;
int this_width;
UCS ucs;
unsigned long remaining_octets;
char *ptr, *savereadptr, *goodreadptr;
savereadptr = start_here;
goodreadptr = start_here;
for(ptr = savereadptr - 1; width_consumed < want_width && ptr >= str; ptr = savereadptr - 1){
savereadptr = ptr;
remaining_octets = goodreadptr - ptr;
ucs = (UCS) utf8_get((unsigned char **) &ptr, &remaining_octets);
if(!(ucs & U8G_ERROR || ucs == UBOGON)){
if(remaining_octets > 0){
/*
* This means there are some bad octets after this good
* character so things are not going to work out well.
* Bail out.
*/
savereadptr = str; /* we're done */
}
else{
this_width = wcellwidth(ucs);
/*
* If this_width is -1 that means we can't print this character
* with our current locale. Writechar will print a '?'.
*/
if(this_width < 0)
this_width = 1;
width_consumed += (unsigned) this_width;
goodreadptr = savereadptr;
}
}
}
if(got_width)
*got_width = width_consumed;
return(savereadptr);
}
/*----------------------------------------------------------------------
copy the source string onto the destination string returning with
the destination string pointer at the end of the destination text
motivation for this is to avoid twice passing over a string that's
being appended to twice (i.e., strcpy(t, x); t += strlen(t))
This doesn't really belong here but it is used here.
----*/
void
sstrncpy(char **d, char *s, int n)
{
while(n-- > 0 && (**d = *s++) != '\0')
(*d)++;
}
/*
* If use_system_routines is set then NULL is the return value and it is
* not an error. Display_charmap and keyboard_charmap should come over as
* malloced strings and will be filled in with the result.
*
* Returns a void pointer to the input_cs CHARSET which is
* passed to mbtow via kbseq().
* If !use_system_routines && NULL is returned, that is an error and err should
* have a message.
* display_charmap and keyboard_charmap should be malloced data and may be
* realloced and changed here.
*/
int
setup_for_input_output(int use_system_routines, char **display_charmap,
char **keyboard_charmap, void **input_cs_arg, char **err)
{
const CHARSET *cs;
const CHARSET *input_cs = NULL;
int already_tried = 0;
int supported = 0;
char buf[1000];
#define cpstr(s) strcpy((char *)fs_get(1+strlen(s)), s)
if(err)
*err = NULL;
if(!display_charmap || !keyboard_charmap || !input_cs_arg){
*err = cpstr("Bad call to setup_for_input_output");
return(-1);
}
if(use_system_routines){
#if PREREQ_FOR_SYS_TRANSLATION
char *dcm;
dcm = nl_langinfo_codeset_wrapper();
dcm = dcm ? dcm : "US-ASCII";
init_utf8_display(0, NULL);
if(*display_charmap){
if(dcm && strucmp(*display_charmap, dcm)){
snprintf(buf, sizeof(buf),
_("Display character set \"%s\" is ignored when using system translation"),
*display_charmap);
*err = cpstr(buf);
}
fs_give((void **) display_charmap);
}
if(*keyboard_charmap){
if(!*err && dcm && strucmp(*keyboard_charmap, dcm)){
snprintf(buf, sizeof(buf),
_("Keyboard character set \"%s\" is ignored when using system translation"),
*keyboard_charmap);
*err = cpstr(buf);
}
fs_give((void **) keyboard_charmap);
}
*display_charmap = cpstr(dcm);
*keyboard_charmap = cpstr(dcm);
#else
*err = cpstr("Bad call to setup_for_input_output");
#endif
*input_cs_arg = NULL;
return(0);
}
try_again1:
if(!(*display_charmap))
*display_charmap = cpstr("US-ASCII");
if(!(*keyboard_charmap))
*keyboard_charmap = cpstr(*display_charmap);
if(*keyboard_charmap){
supported = input_charset_is_supported(*keyboard_charmap);
if(supported){
if(!strucmp(*keyboard_charmap, "utf-8"))
input_cs = utf8_charset(*keyboard_charmap);
else if((cs = utf8_charset(*keyboard_charmap)) != NULL)
input_cs = cs;
}
else{
if(err && !*err){
int iso2022jp = 0;
if(!strucmp(*keyboard_charmap, "ISO-2022-JP"))
iso2022jp = 1;
snprintf(buf, sizeof(buf),
/* TRANSLATORS: The first argument is the name of the character
set the user is trying to use (which is unsupported by alpine).
The second argument is " (except for posting)" if they are
trying to use ISO-2022-JP for something other than posting. */
_("Character set \"%s\" is unsupported%s, using US-ASCII"),
*keyboard_charmap,
iso2022jp ? _(" (except for posting)") : "");
*err = cpstr(buf);
}
input_cs = NULL;
fs_give((void **) keyboard_charmap);
*keyboard_charmap = cpstr("US-ASCII");
if(!already_tried){
already_tried++;
goto try_again1;
}
}
}
try_again2:
if(!(*display_charmap))
*display_charmap = cpstr("US-ASCII");
if(*display_charmap){
supported = output_charset_is_supported(*display_charmap);
if(supported){
if(!strucmp(*display_charmap, "utf-8"))
init_utf8_display(1, NULL);
else if((cs = utf8_charset(*display_charmap)) != NULL)
init_utf8_display(0, utf8_rmap_gen(cs, NULL));
}
else{
if(err && !*err){
int iso2022jp = 0;
if(!strucmp(*display_charmap, "ISO-2022-JP"))
iso2022jp = 1;
snprintf(buf, sizeof(buf),
_("Character set \"%s\" is unsupported%s, using US-ASCII"),
*display_charmap,
iso2022jp ? _(" (except for posting)") : "");
*err = cpstr(buf);
}
fs_give((void **) display_charmap);
if(!already_tried){
already_tried++;
goto try_again2;
}
}
}
else{
if(err && !*err)
*err = cpstr(_("Help, can't figure out display character set or even use US-ASCII."));
}
#undef cpstr
*input_cs_arg = (void *) input_cs;
return(0);
}
int
input_charset_is_supported(char *input_charset)
{
const CHARSET *cs;
if(!(input_charset && *input_charset))
return 0;
if(!strucmp(input_charset, "utf-8"))
return 1;
if((cs = utf8_charset(input_charset)) != NULL){
/*
* This was true 2006-09-25.
*/
switch(cs->type){
case CT_ASCII: case CT_1BYTE0: case CT_1BYTE:
case CT_1BYTE8: case CT_EUC: case CT_DBYTE:
case CT_DBYTE2: case CT_SJIS: case CT_UCS2:
case CT_UCS4: case CT_UTF16:
return 1;
break;
default:
break;
}
}
return 0;
}
int
output_charset_is_supported(char *output_charset)
{
const CHARSET *cs;
if(!(output_charset && *output_charset))
return 0;
if(!strucmp(output_charset, "utf-8"))
return 1;
if((cs = utf8_charset(output_charset)) != NULL && utf8_rmap_gen(cs, NULL))
return 1;
return 0;
}
int
posting_charset_is_supported(char *posting_charset)
{
return(posting_charset && *posting_charset
&& (!strucmp(posting_charset, "ISO-2022-JP")
|| output_charset_is_supported(posting_charset)));
}
/*
* This function is only defined in this special case and so calls
* to it should be wrapped in the same macro conditionals.
*
* Returns the default display charset for a UNIX terminal emulator,
* it is what nl_langinfo(CODESET) should return but we need to
* wrap nl_langinfo because we know of strange behaving implementations.
*/
#if !defined(_WINDOWS) && HAVE_LANGINFO_H && defined(CODESET)
char *
nl_langinfo_codeset_wrapper(void)
{
char *ret = NULL;
ret = nl_langinfo(CODESET);
/*
* If the value returned from nl_langinfo() is not a real charset,
* see if we can figure out what they meant. If we can't figure it
* out return NULL and let the caller decide what to do.
*/
if(ret && *ret && !output_charset_is_supported(ret)){
if(!strcmp("ANSI_X3.4-1968", ret)
|| !strcmp("646", ret)
|| !strcmp("ASCII", ret)
|| !strcmp("C", ret)
|| !strcmp("POSIX", ret))
ret = "US-ASCII";
else if(!strucmp(ret, "UTF8"))
ret = "UTF-8";
else if(!strucmp(ret, "EUCJP"))
ret = "EUC-JP";
else if(!strucmp(ret, "EUCKP"))
ret = "EUC-KP";
else if(!strucmp(ret, "SJIS"))
ret = "SHIFT-JIS";
else if(strstr(ret, "8859")){
char *p;
/* check for digits after 8859 */
p = strstr(ret, "8859");
p += 4;
if(!isdigit(*p))
p++;
if(isdigit(*p)){
static char buf[12];
memset(buf, 0, sizeof(buf));
strncpy(buf, "ISO-8859-", sizeof(buf));
buf[9] = *p++;
if(isdigit(*p))
buf[10] = *p;
ret = buf;
}
}
}
if(ret && !output_charset_is_supported(ret))
ret = NULL;
return(ret);
}
#endif
/*
* Convert the "orig" string from UTF-8 to "charset". If no conversion is
* needed the return value will point to orig. If a conversion is done,
* the return string should be freed by the caller.
* If not possible, returns NULL.
*/
char *
utf8_to_charset(char *orig, char *charset, int report_err)
{
SIZEDTEXT src, dst;
char *ret = orig;
if(!charset || !charset[0] || !orig || !orig[0] || !strucmp(charset, "utf-8"))
return ret;
src.size = strlen(orig);
src.data = (unsigned char *) orig;
if(!strucmp(charset, "us-ascii")){
size_t i;
for(i = 0; i < src.size; i++)
if(src.data[i] & 0x80)
return NULL;
return ret;
}
/*
* This works for ISO-2022-JP because of special code in utf8_cstext
* but not for other 2022 charsets.
*/
memset(&dst, 0, sizeof(dst));
if(utf8_cstext(&src, charset, &dst, report_err ? 0 : '?') && dst.size > 0 && dst.data)
ret = (char *) dst.data; /* c-client already null terminates it */
else
ret = NULL;
if((unsigned char *) ret != dst.data && dst.data)
fs_give((void **) &dst.data);
return ret;
}
/*
* Turn a number into a string with comma's
*
* Args: number -- The long to be turned into a string.
*
* Result: pointer to static string representing number with commas
* Can use up to 3 comatose results at once.
*/
char *
comatose(long int number)
{
long i, x, done_one;
static char buf[3][50];
static int whichbuf = 0;
char *b;
whichbuf = (whichbuf + 1) % 3;
if(number == 0){
strncpy(buf[whichbuf], "0", sizeof(buf[0]));
buf[whichbuf][sizeof(buf[0])-1] = '\0';
return(buf[whichbuf]);
}
done_one = 0;
b = buf[whichbuf];
for(i = 1000000000; i >= 1; i /= 1000) {
x = number / i;
number = number % i;
if(x != 0 || done_one) {
if(b != buf[whichbuf] && (b-buf[whichbuf]) < sizeof(buf[0]))
*b++ = ',';
snprintf(b, sizeof(buf[0])-(b-buf[whichbuf]), done_one ? "%03ld" : "%ld", x);
b += strlen(b);
done_one = 1;
}
}
if(b-buf[whichbuf] < sizeof(buf[0]))
*b = '\0';
return(buf[whichbuf]);
}
/* leave out the commas */
char *
tose(long int number)
{
static char buf[3][50];
static int whichbuf = 0;
whichbuf = (whichbuf + 1) % 3;
snprintf(buf[whichbuf], sizeof(buf[0]), "%ld", number);
return(buf[whichbuf]);
}
/*
* line_paint - where the real work of managing what is displayed gets done.
*/
void
line_paint(int offset, /* current dot offset into vl */
struct display_line *displ,
int *passwd) /* flag to hide display of chars */
{
int i, w, w2, already_got_one = 0;
int vfirst, vlast, dfirst, dlast, vi, di;
int new_vbase;
unsigned (*width_a_to_b)(UCS *, int, int);
/*
* Set passwd to 10 in caller if you want to conceal the
* password but not print asterisks for feedback.
*
* Set passwd to 1 in caller to conceal by printing asterisks.
*/
if(passwd && *passwd >= 10){ /* don't show asterisks */
if(*passwd > 10)
return;
else
*passwd = 11; /* only blat once */
i = 0;
(*displ->movecursor)(displ->row, displ->col);
while(i++ <= displ->dwid)
(*displ->writechar)(' ');
(*displ->movecursor)(displ->row, displ->col);
return;
}
if(passwd && *passwd)
width_a_to_b = single_width_chars_a_to_b;
else
width_a_to_b = ucs4_str_width_a_to_b;
/*
* vl is the virtual line (the actual data). We operate on it by typing
* characters to be added and deleting and so forth. In this routine we
* copy a subset of those UCS-4 characters in vl into dl, the display
* array, and show that subset on the screen.
*
* Offset is the location of the cursor in vl.
*
* We will display the string starting from vbase.
* We have dwid screen cells to work in.
* We may have to adjust vbase in order to display the
* part of the string that contains the cursor.
*
* We'll make the display look like
* vl a b c d e f g h i j k l m
* xxxxxxxxxxxxx <- width dwid window
* < d e f g h >
* |
* vbase
* The < will be there if vbase > 0.
* The > will be there if the string from vbase to the
* end can't all fit in the window.
*/
memset(displ->dl, 0, displ->dlen * sizeof(UCS));
/*
* Adjust vbase so offset is not out of the window to the right.
* (The +2 in w + 2 is for a possible " >" if the string goes past
* the right hand edge of the window and if the last visible character
* is double wide. We don't want the offset to be under that > character.)
*/
for(w = (*width_a_to_b)(displ->vl, displ->vbase, offset);
displ->dwid > 1 &&
w + 2 + (displ->vbase ? 1 : 0) > displ->dwid;
w = (*width_a_to_b)(displ->vl, displ->vbase, offset)){
/*
* offset is off the window to the right
* It looks like a b c d e f g h
* | |
* vbase offset
* and offset is either past the right edge,
* or right at the right edge (and maybe under >),
* or one before right at the edge (and maybe on space
* for half a character).
*
* Since the characters may be double width it is slightly
* complicated to figure out how far to increase vbase.
* We're going to scoot over past width w/2 characters and
* then see if that's sufficient.
*/
new_vbase = displ->vbase + 1;
for(w2 = (*width_a_to_b)(displ->vl, displ->vbase+1, new_vbase);
w2 < displ->dwid/2;
w2 = (*width_a_to_b)(displ->vl, displ->vbase+1, new_vbase))
new_vbase++;
displ->vbase = new_vbase;
}
/* adjust so offset is not out of the window to the left */
while(displ->vbase > 0 && displ->vbase >= offset){
/* add about dwid/2 more width */
new_vbase = displ->vbase - 1;
for(w2 = (*width_a_to_b)(displ->vl, new_vbase, displ->vbase);
w2 < (displ->dwid+1)/2 && new_vbase > 0;
w2 = (*width_a_to_b)(displ->vl, new_vbase, displ->vbase))
new_vbase--;
/* but don't let it get too small, recheck off right end */
for(w = (*width_a_to_b)(displ->vl, new_vbase, offset);
w + 2 + (new_vbase ? 1 : 0) > displ->dwid;
w = (*width_a_to_b)(displ->vl, displ->vbase, offset))
new_vbase++;
displ->vbase = MAX(new_vbase, 0);
}
if(displ->vbase == 1 && ((passwd && *passwd) || wcellwidth(displ->vl[0]) == 1))
displ->vbase = 0;
vfirst = displ->vbase;
dfirst = 0;
if(displ->vbase > 0){ /* off screen cue left */
dfirst = 1; /* index which matches vfirst */
displ->dl[0] = '<';
}
vlast = displ->vused-1; /* end */
w = (*width_a_to_b)(displ->vl, vfirst, vlast);
if(displ->dwid > 0 && w + dfirst > displ->dwid){ /* off window right */
/* find last ucs character to be printed */
while(w + dfirst > displ->dwid - 1) /* -1 for > */
w = (*width_a_to_b)(displ->vl, vfirst, --vlast);
/* worry about double-width characters */
if(w + dfirst == displ->dwid - 1){ /* no prob, hit it exactly */
dlast = dfirst + vlast - vfirst + 1; /* +1 for > */
displ->dl[dlast] = '>';
}
else{
dlast = dfirst + vlast - vfirst + 1;
displ->dl[dlast++] = ' ';
displ->dl[dlast] = '>';
}
}
else
dlast = dfirst + vlast - vfirst;
/*
* Copy the relevant part of the virtual line into the display line.
*/
for(vi = vfirst, di = dfirst; vi <= vlast; vi++, di++)
if(passwd && *passwd)
displ->dl[di] = '*'; /* to conceal password */
else
displ->dl[di] = displ->vl[vi];
/*
* Add spaces to clear the rest of the line.
* We have dwid total space to fill.
*/
w = (*width_a_to_b)(displ->dl, 0, dlast); /* width through dlast */
for(di = dlast+1, i = displ->dwid - w; i > 0 ; i--)
displ->dl[di++] = ' ';
/*
* Draw from left to right, skipping until we get to
* something that is different. Characters may be different
* widths than they were initially so paint from there the
* rest of the way.
*/
for(di = 0; displ->dl[di]; di++){
if(already_got_one || displ->dl[di] != displ->olddl[di]){
/* move cursor first time */
if(!already_got_one++){
w = (di > 0) ? (*width_a_to_b)(displ->dl, 0, di-1) : 0;
(*displ->movecursor)(displ->row, displ->col + w);
}
(*displ->writechar)(displ->dl[di]);
displ->olddl[di] = displ->dl[di];
}
}
memset(&displ->olddl[di], 0, (displ->dlen - di) * sizeof(UCS));
/*
* Move the cursor to the offset.
*
* The offset is relative to the start of the virtual array. We need
* to find the location on the screen. The offset into the display array
* will be offset-vbase+dfirst. We want to be at the start of that
* character, so we need to find the width of all the characters up
* to that point.
*/
w = (offset > 0) ? (*width_a_to_b)(displ->dl, 0, offset-displ->vbase+dfirst-1) : 0;
(*displ->movecursor)(displ->row, displ->col + w);
}
/*
* This is just like ucs4_str_width_a_to_b() except all of the characters
* are assumed to be of width 1. This is for printing out *'s when user
* enters a password, while still managing to use the same code to do the
* display.
*/
unsigned
single_width_chars_a_to_b(UCS *ucsstr, int a, int b)
{
unsigned width = 0;
int i;
if(ucsstr)
for(i = a; i <= b && ucsstr[i]; i++)
width++;
return width;
}
|