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/*
* Copyright 1998-2002 by Albert Cahalan; all rights resered.
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program 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 Library General Public License for more details.
*/
#include <sys/types.h>
#include <string.h>
#include "procps.h"
#include "escape.h"
#include "readproc.h"
// What it would be for a UTF-8 locale:
// "Z-------------------------------"
// "********************************"
// "********************************"
// "*******************************-"
// "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" Trailing UTF-8, and badness in 8-bit.
// "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" Trailing UTF-8, and safe in 8-bit.
// "--222222222222222222222222222222"
// ".333333333333.3.44444444555566--" The '.' means '3', with problem chars.
//
// Problems include non-shortest forms, UTF-16, and non-characters.
// The 4-byte, 5-byte, and 6-byte sequences are full of trouble too.
#if 0
/* sanitize a string, without the nice BSD library function: */
/* strvis(vis_args, k->ki_args, VIS_TAB | VIS_NL | VIS_NOSLASH) */
int octal_escape_str(char *restrict dst, const char *restrict src, size_t n){
unsigned char c;
char d;
size_t i;
const char codes[] =
"Z------abtnvfr-------------e----"
" *******************************" /* better: do not print any space */
"****************************\\***"
"*******************************-"
"--------------------------------"
"********************************"
"********************************"
"********************************";
for(i=0; i<n;){
c = (unsigned char) *(src++);
d = codes[c];
switch(d){
case 'Z':
goto leave;
case '*':
i++;
*(dst++) = c;
break;
case '-':
if(i+4 > n) goto leave;
i += 4;
*(dst++) = '\\';
*(dst++) = "01234567"[c>>6];
*(dst++) = "01234567"[(c>>3)&07];
*(dst++) = "01234567"[c&07];
break;
default:
if(i+2 > n) goto leave;
i += 2;
*(dst++) = '\\';
*(dst++) = d;
break;
}
}
leave:
*(dst++) = '\0';
return i;
}
#endif
/* sanitize a string via one-way mangle */
int escape_str(char *restrict dst, const char *restrict src, int bufsize, int maxglyphs){
unsigned char c;
int my_glyphs = 0;
int my_bytes = 0;
const char codes[] =
"Z-------------------------------"
"********************************"
"********************************"
"*******************************-"
"--------------------------------"
"********************************"
"********************************"
"********************************";
if(bufsize > maxglyphs+1) bufsize=maxglyphs+1; // FIXME: assumes 8-bit locale
for(;;){
if(my_glyphs >= maxglyphs) break;
if(my_bytes+1 >= bufsize) break;
c = (unsigned char) *(src++);
if(!c) break;
if(codes[c]=='-') c='?';
my_glyphs++;
my_bytes++;
*(dst++) = c;
}
*(dst++) = '\0';
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, const char *restrict const *restrict src, size_t bytes){
size_t i = 0;
//if(!*src){ just never call this function without checking first
// do something nice
//}
for(;;){
i += escape_str(dst+i, *src, bytes-i, bytes-i); // FIXME: byte/glyph
if(bytes-i < 3) break; // need room for space, a character, and the NUL
src++;
if(!*src) break; // need something to print
dst[i++] = ' ';
}
return i; // bytes of text, excluding the NUL
}
///////////////////////////////////////////////////
int escape_command(char *restrict const outbuf, const proc_t *restrict const pp, int bytes, int glyphs, unsigned flags){
int overhead = 1; // the trailing NUL
int end = 0;
if(bytes > glyphs+1) bytes=glyphs+1; // FIXME: assumes 8-bit locale
if(flags & ESC_ARGS){
const char **lc = (const char**)pp->cmdline;
if(lc && *lc) return escape_strlist(outbuf, lc, bytes);
}
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 >= bytes){ // if no room for even one byte of the command name
// you'd damn well better have _some_ space
outbuf[0] = '-';
outbuf[1] = '\0';
return 1;
}
if(flags & ESC_BRACKETS){
outbuf[end++] = '[';
}
end += escape_str(outbuf+end, pp->cmd, bytes-overhead, glyphs-overhead+1);
// 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 or glyphs, not including the NUL
}
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