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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/shquote.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/shquote.c')
-rw-r--r-- | lib/sh/shquote.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/lib/sh/shquote.c b/lib/sh/shquote.c new file mode 100644 index 0000000..97e2bc5 --- /dev/null +++ b/lib/sh/shquote.c @@ -0,0 +1,386 @@ +/* shquote - functions to quote and dequote strings */ + +/* Copyright (C) 1999-2015 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) +# ifdef _MINIX +# include <sys/types.h> +# endif +# include <unistd.h> +#endif + +#include <stdio.h> +#include <stdc.h> + +#include "syntax.h" +#include <xmalloc.h> + +#include "shmbchar.h" +#include "shmbutil.h" + +extern char *ansic_quote __P((char *, int, int *)); +extern int ansic_shouldquote __P((const char *)); + +/* Default set of characters that should be backslash-quoted in strings */ +static const char bstab[256] = + { + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 1, 1, 0, 0, 0, 0, 0, /* TAB, NL */ + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + + 1, 1, 1, 0, 1, 0, 1, 1, /* SPACE, !, DQUOTE, DOL, AMP, SQUOTE */ + 1, 1, 1, 0, 1, 0, 0, 0, /* LPAR, RPAR, STAR, COMMA */ + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 1, 1, 0, 1, 1, /* SEMI, LESSTHAN, GREATERTHAN, QUEST */ + + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 1, 1, 1, 1, 0, /* LBRACK, BS, RBRACK, CARAT */ + + 1, 0, 0, 0, 0, 0, 0, 0, /* BACKQ */ + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 1, 1, 1, 0, 0, /* LBRACE, BAR, RBRACE */ + + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }; + +/* **************************************************************** */ +/* */ +/* Functions for quoting strings to be re-read as input */ +/* */ +/* **************************************************************** */ + +/* Return a new string which is the single-quoted version of STRING. + Used by alias and trap, among others. */ +char * +sh_single_quote (string) + const char *string; +{ + register int c; + char *result, *r; + const char *s; + + result = (char *)xmalloc (3 + (4 * strlen (string))); + r = result; + + if (string[0] == '\'' && string[1] == 0) + { + *r++ = '\\'; + *r++ = '\''; + *r++ = 0; + return result; + } + + *r++ = '\''; + + for (s = string; s && (c = *s); s++) + { + *r++ = c; + + if (c == '\'') + { + *r++ = '\\'; /* insert escaped single quote */ + *r++ = '\''; + *r++ = '\''; /* start new quoted string */ + } + } + + *r++ = '\''; + *r = '\0'; + + return (result); +} + +/* Quote STRING using double quotes. Return a new string. */ +char * +sh_double_quote (string) + const char *string; +{ + register unsigned char c; + char *result, *r; + const char *s; + + result = (char *)xmalloc (3 + (2 * strlen (string))); + r = result; + *r++ = '"'; + + for (s = string; s && (c = *s); s++) + { + /* Backslash-newline disappears within double quotes, so don't add one. */ + if ((sh_syntaxtab[c] & CBSDQUOTE) && c != '\n') + *r++ = '\\'; +#if 0 + /* Assume that the string will not be further expanded. */ + else if (c == CTLESC || c == CTLNUL) + *r++ = CTLESC; /* could be '\\'? */ +#endif + + *r++ = c; + } + + *r++ = '"'; + *r = '\0'; + + return (result); +} + +/* Turn S into a simple double-quoted string. If FLAGS is non-zero, quote + double quote characters in S with backslashes. */ +char * +sh_mkdoublequoted (s, slen, flags) + const char *s; + int slen, flags; +{ + char *r, *ret; + int rlen; + + rlen = (flags == 0) ? slen + 3 : (2 * slen) + 1; + ret = r = (char *)xmalloc (rlen); + + *r++ = '"'; + while (*s) + { + if (flags && *s == '"') + *r++ = '\\'; + *r++ = *s++; + } + *r++ = '"'; + *r = '\0'; + + return ret; +} + +/* Remove backslashes that are quoting characters that are special between + double quotes. Return a new string. XXX - should this handle CTLESC + and CTLNUL? */ +char * +sh_un_double_quote (string) + char *string; +{ + register int c, pass_next; + char *result, *r, *s; + + r = result = (char *)xmalloc (strlen (string) + 1); + + for (pass_next = 0, s = string; s && (c = *s); s++) + { + if (pass_next) + { + *r++ = c; + pass_next = 0; + continue; + } + if (c == '\\' && (sh_syntaxtab[(unsigned char) s[1]] & CBSDQUOTE)) + { + pass_next = 1; + continue; + } + *r++ = c; + } + + *r = '\0'; + return result; +} + +/* Quote special characters in STRING using backslashes. Return a new + string. NOTE: if the string is to be further expanded, we need a + way to protect the CTLESC and CTLNUL characters. As I write this, + the current callers will never cause the string to be expanded without + going through the shell parser, which will protect the internal + quoting characters. TABLE, if set, points to a map of the ascii code + set with char needing to be backslash-quoted if table[char]==1. FLAGS, + if 1, causes tildes to be quoted as well. If FLAGS&2, backslash-quote + other shell blank characters. */ + +char * +sh_backslash_quote (string, table, flags) + char *string; + char *table; + int flags; +{ + int c, mb_cur_max; + size_t slen; + char *result, *r, *s, *backslash_table, *send; + DECLARE_MBSTATE; + + slen = strlen (string); + send = string + slen; + result = (char *)xmalloc (2 * slen + 1); + + backslash_table = table ? table : (char *)bstab; + mb_cur_max = MB_CUR_MAX; + + for (r = result, s = string; s && (c = *s); s++) + { +#if defined (HANDLE_MULTIBYTE) + /* XXX - isascii, even if is_basic(c) == 0 - works in most cases. */ + if (c >= 0 && c <= 127 && backslash_table[(unsigned char)c] == 1) + { + *r++ = '\\'; + *r++ = c; + continue; + } + if (mb_cur_max > 1 && is_basic (c) == 0) + { + COPY_CHAR_P (r, s, send); + s--; /* compensate for auto-increment in loop above */ + continue; + } +#endif + if (backslash_table[(unsigned char)c] == 1) + *r++ = '\\'; + else if (c == '#' && s == string) /* comment char */ + *r++ = '\\'; + else if ((flags&1) && c == '~' && (s == string || s[-1] == ':' || s[-1] == '=')) + /* Tildes are special at the start of a word or after a `:' or `=' + (technically unquoted, but it doesn't make a difference in practice) */ + *r++ = '\\'; + else if ((flags&2) && shellblank((unsigned char)c)) + *r++ = '\\'; + *r++ = c; + } + + *r = '\0'; + return (result); +} + +#if defined (PROMPT_STRING_DECODE) +/* Quote characters that get special treatment when in double quotes in STRING + using backslashes. Return a new string. */ +char * +sh_backslash_quote_for_double_quotes (string) + char *string; +{ + unsigned char c; + char *result, *r, *s; + + result = (char *)xmalloc (2 * strlen (string) + 1); + + for (r = result, s = string; s && (c = *s); s++) + { + if (sh_syntaxtab[c] & CBSDQUOTE) + *r++ = '\\'; + /* I should probably add flags for these to sh_syntaxtab[] */ + else if (c == CTLESC || c == CTLNUL) + *r++ = CTLESC; /* could be '\\'? */ + + *r++ = c; + } + + *r = '\0'; + return (result); +} +#endif /* PROMPT_STRING_DECODE */ + +char * +sh_quote_reusable (s, flags) + char *s; + int flags; +{ + char *ret; + + if (s == 0) + return s; + else if (*s == 0) + { + ret = (char *)xmalloc (3); + ret[0] = ret[1] = '\''; + ret[2] = '\0'; + } + else if (ansic_shouldquote (s)) + ret = ansic_quote (s, 0, (int *)0); + else if (flags) + ret = sh_backslash_quote (s, 0, 1); + else + ret = sh_single_quote (s); + + return ret; +} + +int +sh_contains_shell_metas (string) + const char *string; +{ + const char *s; + + for (s = string; s && *s; s++) + { + switch (*s) + { + case ' ': case '\t': case '\n': /* IFS white space */ + case '\'': case '"': case '\\': /* quoting chars */ + case '|': case '&': case ';': /* shell metacharacters */ + case '(': case ')': case '<': case '>': + case '!': case '{': case '}': /* reserved words */ + case '*': case '[': case '?': case ']': /* globbing chars */ + case '^': + case '$': case '`': /* expansion chars */ + return (1); + case '~': /* tilde expansion */ + if (s == string || s[-1] == '=' || s[-1] == ':') + return (1); + break; + case '#': + if (s == string) /* comment char */ + return (1); + /* FALLTHROUGH */ + default: + break; + } + } + + return (0); +} + +int +sh_contains_quotes (string) + const char *string; +{ + const char *s; + + for (s = string; s && *s; s++) + { + if (*s == '\'' || *s == '"' || *s == '\\') + return 1; + } + return 0; +} |