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/* strtrans.c - Translate and untranslate strings with ANSI-C escape
sequences. */
/* Copyright (C) 2000
Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash 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 General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <config.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <bashansi.h>
#include <stdio.h>
#include <chartypes.h>
#include "shell.h"
#ifdef ESC
#undef ESC
#endif
#define ESC '\033' /* ASCII */
/* Convert STRING by expanding the escape sequences specified by the
ANSI C standard. If SAWC is non-null, recognize `\c' and use that
as a string terminator. If we see \c, set *SAWC to 1 before
returning. LEN is the length of STRING. If (FLAGS&1) is non-zero,
that we're translating a string for `echo -e', and therefore should not
treat a single quote as a character that may be escaped with a backslash.
If (FLAGS&2) is non-zero, we're expanding for the parser and want to
quote CTLESC and CTLNUL with CTLESC. If (flags&4) is non-zero, we want
to remove the backslash before any unrecognized escape sequence. */
char *
ansicstr (string, len, flags, sawc, rlen)
char *string;
int len, flags, *sawc, *rlen;
{
int c, temp;
char *ret, *r, *s;
if (string == 0 || *string == '\0')
return ((char *)NULL);
ret = (char *)xmalloc (2*len + 1); /* 2*len for possible CTLESC */
for (r = ret, s = string; s && *s; )
{
c = *s++;
if (c != '\\' || *s == '\0')
*r++ = c;
else
{
switch (c = *s++)
{
#if defined (__STDC__)
case 'a': c = '\a'; break;
case 'v': c = '\v'; break;
#else
case 'a': c = '\007'; break;
case 'v': c = (int) 0x0B; break;
#endif
case 'b': c = '\b'; break;
case 'e': case 'E': /* ESC -- non-ANSI */
c = ESC; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7':
#if 1
if (flags & 1)
{
*r++ = '\\';
break;
}
/*FALLTHROUGH*/
#endif
case '0':
/* If (FLAGS & 1), we're translating a string for echo -e (or
the equivalent xpg_echo option), so we obey the SUSv3/
POSIX-2001 requirement and accept 0-3 octal digits after
a leading `0'. */
temp = 2 + ((flags & 1) && (c == '0'));
for (c -= '0'; ISOCTAL (*s) && temp--; s++)
c = (c * 8) + OCTVALUE (*s);
c &= 0xFF;
break;
case 'x': /* Hex digit -- non-ANSI */
if ((flags & 2) && *s == '{')
{
flags |= 16; /* internal flag value */
s++;
}
/* Consume at least two hex characters */
for (temp = 2, c = 0; ISXDIGIT ((unsigned char)*s) && temp--; s++)
c = (c * 16) + HEXVALUE (*s);
/* DGK says that after a `\x{' ksh93 consumes ISXDIGIT chars
until a non-xdigit or `}', so potentially more than two
chars are consumed. */
if (flags & 16)
{
for ( ; ISXDIGIT ((unsigned char)*s); s++)
c = (c * 16) + HEXVALUE (*s);
flags &= ~16;
if (*s == '}')
s++;
}
/* \x followed by non-hex digits is passed through unchanged */
else if (temp == 2)
{
*r++ = '\\';
c = 'x';
}
c &= 0xFF;
break;
case '\\':
break;
case '\'': case '"': case '?':
if (flags & 1)
*r++ = '\\';
break;
case 'c':
if (sawc)
{
*sawc = 1;
*r = '\0';
if (rlen)
*rlen = r - ret;
return ret;
}
else if ((flags & 1) == 0 && (c = *s))
{
s++;
c = TOCTRL(c);
break;
}
/*FALLTHROUGH*/
default:
if ((flags & 4) == 0)
*r++ = '\\';
break;
}
if ((flags & 2) && (c == CTLESC || c == CTLNUL))
*r++ = CTLESC;
*r++ = c;
}
}
*r = '\0';
if (rlen)
*rlen = r - ret;
return ret;
}
/* Take a string STR, possibly containing non-printing characters, and turn it
into a $'...' ANSI-C style quoted string. Returns a new string. */
char *
ansic_quote (str, flags, rlen)
char *str;
int flags, *rlen;
{
char *r, *ret, *s;
int l, rsize;
unsigned char c;
if (str == 0 || *str == 0)
return ((char *)0);
l = strlen (str);
rsize = 4 * l + 4;
r = ret = (char *)xmalloc (rsize);
*r++ = '$';
*r++ = '\'';
for (s = str, l = 0; *s; s++)
{
c = *s;
l = 1; /* 1 == add backslash; 0 == no backslash */
switch (c)
{
case ESC: c = 'E'; break;
#ifdef __STDC__
case '\a': c = 'a'; break;
case '\v': c = 'v'; break;
#else
case '\007': c = 'a'; break;
case 0x0b: c = 'v'; break;
#endif
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 '\\':
case '\'':
break;
default:
if (ISPRINT (c) == 0)
{
*r++ = '\\';
*r++ = TOCHAR ((c >> 6) & 07);
*r++ = TOCHAR ((c >> 3) & 07);
*r++ = TOCHAR (c & 07);
continue;
}
l = 0;
break;
}
if (l)
*r++ = '\\';
*r++ = c;
}
*r++ = '\'';
*r = '\0';
if (rlen)
*rlen = r - ret;
return ret;
}
/* return 1 if we need to quote with $'...' because of non-printing chars. */
int
ansic_shouldquote (string)
const char *string;
{
const char *s;
unsigned char c;
if (string == 0)
return 0;
for (s = string; c = *s; s++)
if (ISPRINT (c) == 0)
return 1;
return 0;
}
/* $'...' ANSI-C expand the portion of STRING between START and END and
return the result. The result cannot be longer than the input string. */
char *
ansiexpand (string, start, end, lenp)
char *string;
int start, end, *lenp;
{
char *temp, *t;
int len, tlen;
temp = (char *)xmalloc (end - start + 1);
for (tlen = 0, len = start; len < end; )
temp[tlen++] = string[len++];
temp[tlen] = '\0';
if (*temp)
{
t = ansicstr (temp, tlen, 2, (int *)NULL, lenp);
free (temp);
return (t);
}
else
{
if (lenp)
*lenp = 0;
return (temp);
}
}
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