diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 103 |
1 files changed, 102 insertions, 1 deletions
diff --git a/shell/hush.c b/shell/hush.c index 1aa0a40..af6a9a7 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -384,6 +384,7 @@ #define BASH_PATTERN_SUBST ENABLE_HUSH_BASH_COMPAT #define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT #define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT +#define BASH_DOLLAR_SQUOTE ENABLE_HUSH_BASH_COMPAT #define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT #define BASH_EPOCH_VARS ENABLE_HUSH_BASH_COMPAT #define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST) @@ -4919,6 +4920,100 @@ static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsign } #endif /* ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS */ +#if BASH_DOLLAR_SQUOTE +/* Return code: 1 for "found and parsed", 0 for "seen something else" */ +#if BB_MMU +#define parse_dollar_squote(as_string, dest, input) \ + parse_dollar_squote(dest, input) +#define as_string NULL +#endif +static int parse_dollar_squote(o_string *as_string, o_string *dest, struct in_str *input) +{ + int start; + int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */ + debug_printf_parse("parse_dollar_squote entered: ch='%c'\n", ch); + if (ch != '\'') + return 0; + + dest->has_quoted_part = 1; + start = dest->length; + + ch = i_getch(input); /* eat ' */ + nommu_addchr(as_string, ch); + while (1) { + ch = i_getch(input); + nommu_addchr(as_string, ch); + if (ch == EOF) { + syntax_error_unterm_ch('\''); + return 0; + } + if (ch == '\'') + break; + if (ch == SPECIAL_VAR_SYMBOL) { + /* Convert raw ^C to corresponding special variable reference */ + o_addchr(dest, SPECIAL_VAR_SYMBOL); + o_addchr(dest, SPECIAL_VAR_QUOTED_SVS); + /* will addchr() another SPECIAL_VAR_SYMBOL (see after the if() block) */ + } else if (ch == '\\') { + static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567"; + + ch = i_getch(input); + nommu_addchr(as_string, ch); + if (strchr(C_escapes, ch)) { + char buf[4]; + char *p = buf; + int cnt = 2; + + buf[0] = ch; + if ((unsigned char)(ch - '0') <= 7) { /* \ooo */ + do { + ch = i_peek(input); + if ((unsigned char)(ch - '0') > 7) + break; + *++p = ch = i_getch(input); + nommu_addchr(as_string, ch); + } while (--cnt != 0); + } else if (ch == 'x') { /* \xHH */ + do { + ch = i_peek(input); + if (!isxdigit(ch)) + break; + *++p = ch = i_getch(input); + nommu_addchr(as_string, ch); + } while (--cnt != 0); + if (cnt == 2) { /* \x but next char is "bad" */ + ch = 'x'; + goto unrecognized; + } + } /* else simple seq like \\ or \t */ + *++p = '\0'; + p = buf; + ch = bb_process_escape_sequence((void*)&p); + //bb_error_msg("buf:'%s' ch:%x", buf, ch); + if (ch == '\0') + continue; /* bash compat: $'...\0...' emits nothing */ + } else { /* unrecognized "\z": encode both chars unless ' or " */ + if (ch != '\'' && ch != '"') { + unrecognized: + o_addqchr(dest, '\\'); + } + } + } /* if (\...) */ + o_addqchr(dest, ch); + } + + if (dest->length == start) { + /* $'', $'\0', $'\000\x00' and the like */ + o_addchr(dest, SPECIAL_VAR_SYMBOL); + o_addchr(dest, SPECIAL_VAR_SYMBOL); + } + + return 1; +} +#else +# #define parse_dollar_squote(as_string, dest, input) 0 +#endif /* BASH_DOLLAR_SQUOTE */ + /* Return code: 0 for OK, 1 for syntax error */ #if BB_MMU #define parse_dollar(as_string, dest, input, quote_mask) \ @@ -4931,7 +5026,7 @@ static int parse_dollar(o_string *as_string, { int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */ - debug_printf_parse("parse_dollar entered: ch='%c'\n", ch); + debug_printf_parse("parse_dollar entered: ch='%c' quote_mask:0x%x\n", ch, quote_mask); if (isalpha(ch)) { make_var: ch = i_getch(input); @@ -5247,6 +5342,8 @@ static int encode_string(o_string *as_string, goto again; } if (ch == '$') { + //if (parse_dollar_squote(as_string, dest, input)) + // goto again; if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) { debug_printf_parse("encode_string return 0: " "parse_dollar returned 0 (error)\n"); @@ -5723,6 +5820,8 @@ static struct pipe *parse_stream(char **pstring, o_addchr(&ctx.word, ch); continue; /* get next char */ case '$': + if (parse_dollar_squote(&ctx.as_string, &ctx.word, input)) + continue; /* get next char */ if (!parse_dollar(&ctx.as_string, &ctx.word, input, /*quote_mask:*/ 0)) { debug_printf_parse("parse_stream parse error: " "parse_dollar returned 0 (error)\n"); @@ -6166,6 +6265,8 @@ static char *encode_then_expand_vararg(const char *str, int handle_squotes, int continue; } if (ch == '$') { + if (parse_dollar_squote(NULL, &dest, &input)) + continue; if (!parse_dollar(NULL, &dest, &input, /*quote_mask:*/ 0x80)) { debug_printf_parse("%s: error: parse_dollar returned 0 (error)\n", __func__); goto ret; |