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-rw-r--r--lib/sh/strtrans.c400
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diff --git a/lib/sh/strtrans.c b/lib/sh/strtrans.c
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+/* strtrans.c - Translate and untranslate strings with ANSI-C escape sequences. */
+
+/* Copyright (C) 2000-2015 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <bashansi.h>
+#include <stdio.h>
+#include <chartypes.h>
+
+#include "shell.h"
+
+#include "shmbchar.h"
+#include "shmbutil.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;
+ unsigned long v;
+ size_t clen;
+ int b, mb_cur_max;
+#if defined (HANDLE_MULTIBYTE)
+ wchar_t wc;
+#endif
+
+ if (string == 0 || *string == '\0')
+ return ((char *)NULL);
+
+ mb_cur_max = MB_CUR_MAX;
+#if defined (HANDLE_MULTIBYTE)
+ temp = 4*len + 4;
+ if (temp < 12)
+ temp = 12; /* ensure enough for eventual u32cesc */
+ ret = (char *)xmalloc (temp);
+#else
+ ret = (char *)xmalloc (2*len + 1); /* 2*len for possible CTLESC */
+#endif
+ for (r = ret, s = string; s && *s; )
+ {
+ c = *s++;
+ if (c != '\\' || *s == '\0')
+ {
+ clen = 1;
+#if defined (HANDLE_MULTIBYTE)
+ if ((locale_utf8locale && (c & 0x80)) ||
+ (locale_utf8locale == 0 && mb_cur_max > 0 && is_basic (c) == 0))
+ {
+ clen = mbrtowc (&wc, s - 1, mb_cur_max, 0);
+ if (MB_INVALIDCH (clen))
+ clen = 1;
+ }
+#endif
+ *r++ = c;
+ for (--clen; clen > 0; clen--)
+ *r++ = *s++;
+ }
+ else
+ {
+ switch (c = *s++)
+ {
+#if defined (__STDC__)
+ case 'a': c = '\a'; break;
+ case 'v': c = '\v'; break;
+#else
+ case 'a': c = (int) 0x07; 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;
+#if defined (HANDLE_MULTIBYTE)
+ case 'u':
+ case 'U':
+ temp = (c == 'u') ? 4 : 8; /* \uNNNN \UNNNNNNNN */
+ for (v = 0; ISXDIGIT ((unsigned char)*s) && temp--; s++)
+ v = (v * 16) + HEXVALUE (*s);
+ if (temp == ((c == 'u') ? 4 : 8))
+ {
+ *r++ = '\\'; /* c remains unchanged */
+ break;
+ }
+ else if (v <= 0x7f) /* <= 0x7f translates directly */
+ {
+ c = v;
+ break;
+ }
+ else
+ {
+ temp = u32cconv (v, r);
+ r += temp;
+ continue;
+ }
+#endif
+ 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 && *s == 0)
+ ; /* pass \c through */
+ else if ((flags & 1) == 0 && (c = *s))
+ {
+ s++;
+ if ((flags & 2) && c == '\\' && c == *s)
+ s++; /* Posix requires $'\c\\' do backslash escaping */
+ 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 $'...' ANSI-C style quoted string. Returns a new string. */
+char *
+ansic_quote (str, flags, rlen)
+ char *str;
+ int flags, *rlen;
+{
+ char *r, *ret, *s;
+ int l, rsize;
+ unsigned char c;
+ size_t clen;
+ int b;
+#if defined (HANDLE_MULTIBYTE)
+ wchar_t wc;
+#endif
+
+ if (str == 0 || *str == 0)
+ return ((char *)0);
+
+ l = strlen (str);
+ rsize = 4 * l + 4;
+ r = ret = (char *)xmalloc (rsize);
+
+ *r++ = '$';
+ *r++ = '\'';
+
+ for (s = str; c = *s; s++)
+ {
+ b = l = 1; /* 1 == add backslash; 0 == no backslash */
+ clen = 1;
+
+ switch (c)
+ {
+ case ESC: c = 'E'; break;
+#ifdef __STDC__
+ case '\a': c = 'a'; break;
+ case '\v': c = 'v'; break;
+#else
+ case 0x07: 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 defined (HANDLE_MULTIBYTE)
+ b = is_basic (c);
+ /* XXX - clen comparison to 0 is dicey */
+ if ((b == 0 && ((clen = mbrtowc (&wc, s, MB_CUR_MAX, 0)) < 0 || MB_INVALIDCH (clen) || iswprint (wc) == 0)) ||
+ (b == 1 && ISPRINT (c) == 0))
+#else
+ if (ISPRINT (c) == 0)
+#endif
+ {
+ *r++ = '\\';
+ *r++ = TOCHAR ((c >> 6) & 07);
+ *r++ = TOCHAR ((c >> 3) & 07);
+ *r++ = TOCHAR (c & 07);
+ continue;
+ }
+ l = 0;
+ break;
+ }
+ if (b == 0 && clen == 0)
+ break;
+
+ if (l)
+ *r++ = '\\';
+
+ if (clen == 1)
+ *r++ = c;
+ else
+ {
+ for (b = 0; b < (int)clen; b++)
+ *r++ = (unsigned char)s[b];
+ s += clen - 1; /* -1 because of the increment above */
+ }
+ }
+
+ *r++ = '\'';
+ *r = '\0';
+ if (rlen)
+ *rlen = r - ret;
+ return ret;
+}
+
+#if defined (HANDLE_MULTIBYTE)
+int
+ansic_wshouldquote (string)
+ const char *string;
+{
+ const wchar_t *wcs;
+ wchar_t wcc;
+ wchar_t *wcstr = NULL;
+ size_t slen;
+
+ slen = mbstowcs (wcstr, string, 0);
+
+ if (slen == (size_t)-1)
+ return 1;
+
+ wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1));
+ mbstowcs (wcstr, string, slen + 1);
+
+ for (wcs = wcstr; wcc = *wcs; wcs++)
+ if (iswprint(wcc) == 0)
+ {
+ free (wcstr);
+ return 1;
+ }
+
+ free (wcstr);
+ return 0;
+}
+#endif
+
+/* 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 defined (HANDLE_MULTIBYTE)
+ if (is_basic (c) == 0)
+ return (ansic_wshouldquote (s));
+#endif
+ 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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