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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:33:23 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:33:23 +0000 |
commit | 1d5cace9db9aef76f26b2d7ba54bbb76443b00b2 (patch) | |
tree | 314a15dd1aa103da13bdc83ba1d2105a290bc5ba /lib/sh/strtrans.c | |
parent | Initial commit. (diff) | |
download | bash-upstream.tar.xz bash-upstream.zip |
Adding upstream version 5.0.upstream/5.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/sh/strtrans.c')
-rw-r--r-- | lib/sh/strtrans.c | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/lib/sh/strtrans.c b/lib/sh/strtrans.c new file mode 100644 index 0000000..48f255f --- /dev/null +++ b/lib/sh/strtrans.c @@ -0,0 +1,380 @@ +/* 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; + + if (string == 0 || *string == '\0') + return ((char *)NULL); + +#if defined (HANDLE_MULTIBYTE) + temp = 4*len + 1; + 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') + *r++ = c; + 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); + } +} |