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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 <ctype.h>
#include "shell.h"
#ifdef ESC
#undef ESC
#endif
#define ESC '\033' /* ASCII */
#ifndef ISOCTAL
#define ISOCTAL(c) ((c) >= '0' && (c) <= '7')
#endif
#ifndef OCTVALUE
#define OCTVALUE(c) ((c) - '0')
#endif
#ifndef isxdigit
# define isxdigit(c) (isdigit((c)) || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
#endif
#define HEXVALUE(c) \
((c) >= 'a' && (c) <= 'f' ? (c)-'a'+10 : (c) >= 'A' && (c) <= 'F' ? (c)-'A'+10 : (c)-'0')
/* 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. FOR_ECHO is a flag that
means, if 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. */
char *
ansicstr (string, len, for_echo, sawc, rlen)
char *string;
int len, for_echo, *sawc, *rlen;
{
int c, temp;
char *ret, *r, *s;
if (string == 0 || *string == '\0')
return ((char *)NULL);
ret = xmalloc (len + 1);
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 '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
for (temp = 2, c -= '0'; ISOCTAL (*s) && temp--; s++)
c = (c * 8) + OCTVALUE (*s);
break;
case 'x': /* Hex digit -- non-ANSI */
for (temp = 3, c = 0; isxdigit (*s) && temp--; s++)
c = (c * 16) + HEXVALUE (*s);
/* \x followed by non-hex digits is passed through unchanged */
if (temp == 3)
{
*r++ = '\\';
c = 'x';
}
break;
case '\\':
break;
case '\'':
if (for_echo)
*r++ = '\\';
break;
case 'c':
if (sawc)
{
*sawc = 1;
*r = '\0';
if (rlen)
*rlen = r - ret;
return ret;
}
default: *r++ = '\\'; break;
}
*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 $'...' ANSI-C style quoted string. Returns a new string. */
char *
ansic_quote (str, flags, rlen)
char *str;
int flags, *rlen;
{
char *r, *ret, *s, obuf[8];
int l, c, rsize, t;
if (str == 0 || *str == 0)
return ((char *)0);
l = strlen (str);
rsize = 2 * l + 4;
r = ret = xmalloc (rsize);
*r++ = '$';
*r++ = '\'';
for (s = str, l = 0; *s; s++)
{
c = *(unsigned char *)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)
{
sprintf (obuf, "\\%.3o", c);
t = r - ret;
RESIZE_MALLOCED_BUFFER (ret, t, 5, rsize, 16);
r = ret + t; /* in case reallocated */
for (t = 0; t < 4; t++)
*r++ = obuf[t];
continue;
}
l = 0;
break;
}
if (l)
*r++ = '\\';
*r++ = c;
}
*r++ = '\'';
*r = '\0';
if (rlen)
*rlen = r - ret;
return ret;
}
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