/*
* escape.c - printing handling
* Copyright 1998-2002 by Albert Cahalan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <limits.h>
#include "procps.h"
#include "escape.h"
#include "readproc.h"
#if (__GNU_LIBRARY__ >= 6) && (!defined(__UCLIBC__) || defined(__UCLIBC_HAS_WCHAR__))
# include <wchar.h>
# include <wctype.h>
# include <stdlib.h> /* MB_CUR_MAX */
# include <ctype.h>
# include <langinfo.h>
#endif
#define SECURE_ESCAPE_ARGS(dst, bytes, cells) do { \
if ((bytes) <= 0) return 0; \
*(dst) = '\0'; \
if ((bytes) >= INT_MAX) return 0; \
if ((cells) >= INT_MAX) return 0; \
if ((cells) <= 0) return 0; \
} while (0)
#if (__GNU_LIBRARY__ >= 6) && (!defined(__UCLIBC__) || defined(__UCLIBC_HAS_WCHAR__))
static int escape_str_utf8(char *restrict dst, const char *restrict src, int bufsize, int *maxcells){
int my_cells = 0;
int my_bytes = 0;
mbstate_t s;
SECURE_ESCAPE_ARGS(dst, bufsize, *maxcells);
memset(&s, 0, sizeof (s));
for(;;) {
wchar_t wc;
int len = 0;
if(my_cells >= *maxcells || my_bytes+1 >= bufsize)
break;
if (!(len = mbrtowc (&wc, src, MB_CUR_MAX, &s)))
/* 'str' contains \0 */
break;
if (len < 0) {
/* invalid multibyte sequence -- zeroize state */
memset (&s, 0, sizeof (s));
*(dst++) = '?';
src++;
my_cells++;
my_bytes++;
} else if (len==1) {
/* non-multibyte */
*(dst++) = isprint(*src) ? *src : '?';
src++;
my_cells++;
my_bytes++;
} else if (!iswprint(wc)) {
/* multibyte - no printable */
*(dst++) = '?';
src+=len;
my_cells++;
my_bytes++;
} else {
/* multibyte - printable */
int wlen = wcwidth(wc);
if (wlen<=0) {
// invisible multibyte -- we don't ignore it, because some terminal
// interpret it wrong and more safe is replace it with '?'
*(dst++) = '?';
src+=len;
my_cells++;
my_bytes++;
} else {
// multibyte - printable
// Got space?
if (wlen > *maxcells-my_cells || len >= bufsize-(my_bytes+1)) break;
// 0x9b is control byte for some terminals
if (memchr(src, 0x9B, len)) {
// unsafe multibyte
*(dst++) = '?';
src+=len;
my_cells++;
my_bytes++;
} else {
// safe multibyte
memcpy(dst, src, len);
my_cells += wlen;
dst += len;
my_bytes += len;
src += len;
}
}
}
//fprintf(stdout, "cells: %d\n", my_cells);
}
*dst = '\0';
// fprintf(stderr, "maxcells: %d, my_cells; %d\n", *maxcells, my_cells);
*maxcells -= my_cells;
return my_bytes; // bytes of text, excluding the NUL
}
#endif /* __GNU_LIBRARY__ */
/* sanitize a string via one-way mangle */
int escape_str(char *restrict dst, const char *restrict src, int bufsize, int *maxcells){
unsigned char c;
int my_cells = 0;
int my_bytes = 0;
const char codes[] =
"Z..............................."
"||||||||||||||||||||||||||||||||"
"||||||||||||||||||||||||||||||||"
"|||||||||||||||||||||||||||||||."
"????????????????????????????????"
"????????????????????????????????"
"????????????????????????????????"
"????????????????????????????????";
#if (__GNU_LIBRARY__ >= 6) && (!defined(__UCLIBC__) || defined(__UCLIBC_HAS_WCHAR__))
static int utf_init=0;
if(utf_init==0){
/* first call -- check if UTF stuff is usable */
char *enc = nl_langinfo(CODESET);
utf_init = enc && strcasecmp(enc, "UTF-8")==0 ? 1 : -1;
}
if (utf_init==1 && MB_CUR_MAX>1) {
/* UTF8 locales */
return escape_str_utf8(dst, src, bufsize, maxcells);
}
#endif
SECURE_ESCAPE_ARGS(dst, bufsize, *maxcells);
if(bufsize > *maxcells+1) bufsize=*maxcells+1; // FIXME: assumes 8-bit locale
for(;;){
if(my_cells >= *maxcells || my_bytes+1 >= bufsize)
break;
c = (unsigned char) *(src++);
if(!c) break;
if(codes[c]!='|') c=codes[c];
my_cells++;
my_bytes++;
*(dst++) = c;
}
*dst = '\0';
*maxcells -= my_cells;
return my_bytes; // bytes of text, excluding the NUL
}
/////////////////////////////////////////////////
// escape an argv or environment string array
//
// bytes arg means sizeof(buf)
int escape_strlist(char *restrict dst, char *restrict const *restrict src, size_t bytes, int *cells){
size_t i = 0;
SECURE_ESCAPE_ARGS(dst, bytes, *cells);
for(;;){
i += escape_str(dst+i, *src, bytes-i, cells);
if(bytes-i < 3) break; // need room for space, a character, and the NUL
src++;
if(!*src) break; // need something to print
if (*cells<=1) break; // need room for printed size of text
dst[i++] = ' ';
--*cells;
}
return i; // bytes, excluding the NUL
}
///////////////////////////////////////////////////
int escape_command(char *restrict const outbuf, const proc_t *restrict const pp, int bytes, int *cells, unsigned flags){
int overhead = 0;
int end = 0;
SECURE_ESCAPE_ARGS(outbuf, bytes, *cells);
if(flags & ESC_ARGS){
char **lc = (char**)pp->cmdline;
if(lc && *lc) return escape_strlist(outbuf, lc, bytes, cells);
}
if(flags & ESC_BRACKETS){
overhead += 2;
}
if(flags & ESC_DEFUNCT){
if(pp->state=='Z') overhead += 10; // chars in " <defunct>"
else flags &= ~ESC_DEFUNCT;
}
if(overhead + 1 >= *cells || // if no room for even one byte of the command name
overhead + 1 >= bytes){
outbuf[0] = '\0';
return 0;
}
if(flags & ESC_BRACKETS){
outbuf[end++] = '[';
}
*cells -= overhead;
end += escape_str(outbuf+end, pp->cmd, bytes-overhead, cells);
// Hmmm, do we want "[foo] <defunct>" or "[foo <defunct>]"?
if(flags & ESC_BRACKETS){
outbuf[end++] = ']';
}
if(flags & ESC_DEFUNCT){
memcpy(outbuf+end, " <defunct>", 10);
end += 10;
}
outbuf[end] = '\0';
return end; // bytes, not including the NUL
}
/////////////////////////////////////////////////
// copy an already 'escaped' string,
// using the traditional escape.h calling conventions
int escaped_copy(char *restrict dst, const char *restrict src, int bufsize, int *maxroom){
int n;
SECURE_ESCAPE_ARGS(dst, bufsize, *maxroom);
if (bufsize > *maxroom+1) bufsize = *maxroom+1;
n = snprintf(dst, bufsize, "%s", src);
if (n < 0) {
*dst = '\0';
return 0;
}
if (n >= bufsize) n = bufsize-1;
*maxroom -= n;
return n;
}