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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* return string with expanded escape chars
*/
#include <ast.h>
#include <ccode.h>
#include <ctype.h>
/*
* quote string as of length n with qb...qe
* (flags&FMT_ALWAYS) always quotes, otherwise quote output only if necessary
* qe and the usual suspects are \... escaped
* (flags&FMT_WIDE) doesn't escape 8 bit chars
* (flags&FMT_ESCAPED) doesn't \... escape the usual suspects
* (flags&FMT_SHELL) escape $`"#;~&|()<>[]*?
*/
char*
fmtquote(const char* as, const char* qb, const char* qe, size_t n, int flags)
{
register unsigned char* s = (unsigned char*)as;
register unsigned char* e = s + n;
register char* b;
register int c;
register int escaped;
register int spaced;
register int doublequote;
register int singlequote;
int shell;
char* f;
char* buf;
c = 4 * (n + 1);
if (qb)
c += strlen((char*)qb);
if (qe)
c += strlen((char*)qe);
b = buf = fmtbuf(c);
shell = 0;
doublequote = 0;
singlequote = 0;
if (qb)
{
if (qb[0] == '$' && qb[1] == '\'' && qb[2] == 0)
shell = 1;
else if ((flags & FMT_SHELL) && qb[1] == 0)
{
if (qb[0] == '"')
doublequote = 1;
else if (qb[0] == '\'')
singlequote = 1;
}
while (*b = *qb++)
b++;
}
else if (flags & FMT_SHELL)
doublequote = 1;
f = b;
escaped = spaced = !!(flags & FMT_ALWAYS);
while (s < e)
{
if ((c = mbsize(s)) > 1)
{
while (c-- && s < e)
*b++ = *s++;
}
else
{
c = *s++;
if (!(flags & FMT_ESCAPED) && (iscntrl(c) || !isprint(c) || c == '\\'))
{
escaped = 1;
*b++ = '\\';
switch (c)
{
case CC_bel:
c = 'a';
break;
case '\b':
c = 'b';
break;
case '\f':
c = 'f';
break;
case '\n':
c = 'n';
break;
case '\r':
c = 'r';
break;
case '\t':
c = 't';
break;
case CC_vt:
c = 'v';
break;
case CC_esc:
c = 'E';
break;
case '\\':
break;
default:
if (!(flags & FMT_WIDE) || !(c & 0200))
{
*b++ = '0' + ((c >> 6) & 07);
*b++ = '0' + ((c >> 3) & 07);
c = '0' + (c & 07);
}
else
b--;
break;
}
}
else if (c == '\\')
{
escaped = 1;
*b++ = c;
if (*s)
c = *s++;
}
else if (qe && strchr(qe, c))
{
if (singlequote && c == '\'')
{
spaced = 1;
*b++ = '\'';
*b++ = '\\';
*b++ = '\'';
c = '\'';
}
else
{
escaped = 1;
*b++ = '\\';
}
}
else if (c == '$' || c == '`')
{
if (c == '$' && (flags & FMT_PARAM) && (*s == '{' || *s == '('))
{
if (singlequote || shell)
{
escaped = 1;
*b++ = '\'';
*b++ = c;
*b++ = *s++;
if (shell)
{
spaced = 1;
*b++ = '$';
}
c = '\'';
}
else
{
escaped = 1;
*b++ = c;
c = *s++;
}
}
else if (doublequote)
*b++ = '\\';
else if (singlequote || (flags & FMT_SHELL))
spaced = 1;
}
else if (!spaced && !escaped && (isspace(c) || ((flags & FMT_SHELL) || shell) && (strchr("\";~&|()<>[]*?", c) || c == '#' && (b == f || isspace(*(b - 1))))))
spaced = 1;
*b++ = c;
}
}
if (qb)
{
if (!escaped)
buf += shell + !spaced;
if (qe && (escaped || spaced))
while (*b = *qe++)
b++;
}
*b = 0;
return buf;
}
/*
* escape the usual suspects and quote chars in qs
* in length n string as
*/
char*
fmtnesq(const char* as, const char* qs, size_t n)
{
return fmtquote(as, NiL, qs, n, 0);
}
/*
* escape the usual suspects and quote chars in qs
*/
char*
fmtesq(const char* as, const char* qs)
{
return fmtquote(as, NiL, qs, strlen((char*)as), 0);
}
/*
* escape the usual suspects
*/
char*
fmtesc(const char* as)
{
return fmtquote(as, NiL, NiL, strlen((char*)as), 0);
}
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