ash: optional support for $'...\t...\n...' bashism
function old new delta readtoken1 2824 3172 +348 static.C_escapes - 18 +18 parse_command 1504 1500 -4 SIT 89 83 -6 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/2 up/down: 366/-10) Total: 356 bytes
This commit is contained in:
Denis Vlasenko
parent
a80d0e4bf7
commit
ef527f50e6
115
shell/ash.c
115
shell/ash.c
@ -1460,19 +1460,19 @@ _STPUTC(int c, char *p)
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if (l > m) \
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(p) = makestrspace(l, q); \
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} while (0)
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#define USTPUTC(c, p) (*p++ = (c))
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#define USTPUTC(c, p) (*(p)++ = (c))
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#define STACKSTRNUL(p) \
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do { \
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if ((p) == sstrend) \
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p = growstackstr(); \
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*p = '\0'; \
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(p) = growstackstr(); \
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*(p) = '\0'; \
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} while (0)
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#define STUNPUTC(p) (--p)
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#define STTOPC(p) (p[-1])
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#define STADJUST(amount, p) (p += (amount))
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#define STUNPUTC(p) (--(p))
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#define STTOPC(p) ((p)[-1])
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#define STADJUST(amount, p) ((p) += (amount))
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#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
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#define ungrabstackstr(s, p) stunalloc((s))
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#define ungrabstackstr(s, p) stunalloc(s)
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#define stackstrend() ((void *)sstrend)
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@ -2687,10 +2687,10 @@ SIT(int c, int syntax)
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) {
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return CCTL;
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} else {
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s = strchr(spec_symbls, c);
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if (s == NULL || *s == '\0')
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s = strchrnul(spec_symbls, c);
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if (*s == '\0')
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return CWORD;
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indx = syntax_index_table[(s - spec_symbls)];
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indx = syntax_index_table[s - spec_symbls];
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}
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return S_I_T[indx][syntax];
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}
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@ -4201,7 +4201,7 @@ cmdputs(const char *s)
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nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
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p = s;
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while ((c = *p++) != 0) {
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str = 0;
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str = NULL;
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switch (c) {
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case CTLESC:
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c = *p++;
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@ -10345,6 +10345,52 @@ parse_command(void)
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return n1;
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}
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#if ENABLE_ASH_BASH_COMPAT
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static int decode_dollar_squote(void)
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{
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static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
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int c, cnt;
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char *p;
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char buf[4];
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c = pgetc();
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p = strchr(C_escapes, c);
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if (p) {
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buf[0] = c;
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p = buf;
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cnt = 3;
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if ((unsigned char)(c - '0') <= 7) { /* \ooo */
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do {
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c = pgetc();
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*++p = c;
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} while ((unsigned char)(c - '0') <= 7 && --cnt);
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pungetc();
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} else if (c == 'x') { /* \xHH */
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do {
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c = pgetc();
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*++p = c;
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} while (isxdigit(c) && --cnt);
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pungetc();
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if (cnt == 3) { /* \x but next char is "bad" */
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c = 'x';
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goto unrecognized;
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}
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} else { /* simple seq like \\ or \t */
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p++;
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}
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*p = '\0';
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p = buf;
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c = bb_process_escape_sequence((void*)&p);
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} else { /* unrecognized "\z": print both chars unless ' or " */
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if (c != '\'' && c != '"') {
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unrecognized:
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c |= 0x100; /* "please encode \, then me" */
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}
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}
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return c;
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}
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#endif
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/*
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* If eofmark is NULL, read a word or a redirection symbol. If eofmark
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* is not NULL, read a here document. In the latter case, eofmark is the
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@ -10356,14 +10402,12 @@ parse_command(void)
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* using goto's to implement the subroutine linkage. The following macros
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* will run code that appears at the end of readtoken1.
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*/
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#define CHECKEND() {goto checkend; checkend_return:;}
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#define PARSEREDIR() {goto parseredir; parseredir_return:;}
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#define PARSESUB() {goto parsesub; parsesub_return:;}
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#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
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#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
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#define PARSEARITH() {goto parsearith; parsearith_return:;}
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static int
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readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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{
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@ -10385,6 +10429,8 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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int parenlevel; /* levels of parens in arithmetic */
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int dqvarnest; /* levels of variables expansion within double quotes */
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USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
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#if __GNUC__
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/* Avoid longjmp clobbering */
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(void) &out;
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@ -10435,6 +10481,15 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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case CCTL:
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if (eofmark == NULL || dblquote)
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USTPUTC(CTLESC, out);
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#if ENABLE_ASH_BASH_COMPAT
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if (c == '\\' && bash_dollar_squote) {
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c = decode_dollar_squote();
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if (c & 0x100) {
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USTPUTC('\\', out);
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c = (unsigned char)c;
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}
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}
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#endif
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USTPUTC(c, out);
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break;
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case CBACK: /* backslash */
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@ -10453,11 +10508,9 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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USTPUTC('\\', out);
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}
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#endif
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if (dblquote &&
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c != '\\' && c != '`' &&
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c != '$' && (
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c != '"' ||
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eofmark != NULL)
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if (dblquote && c != '\\'
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&& c != '`' && c != '$'
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&& (c != '"' || eofmark != NULL)
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) {
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USTPUTC(CTLESC, out);
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USTPUTC('\\', out);
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@ -10480,6 +10533,7 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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dblquote = 1;
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goto quotemark;
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case CENDQUOTE:
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USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
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if (eofmark != NULL && arinest == 0
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&& varnest == 0
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) {
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@ -10552,7 +10606,7 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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}
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c = pgetc_macro();
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}
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} /* for(;;) */
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}
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endword:
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#if ENABLE_ASH_MATH_SUPPORT
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@ -10573,12 +10627,13 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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if ((c == '>' || c == '<')
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&& quotef == 0
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&& len <= 2
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&& (*out == '\0' || isdigit(*out))) {
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&& (*out == '\0' || isdigit(*out))
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) {
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PARSEREDIR();
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return lasttoken = TREDIR;
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} else {
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pungetc();
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lasttoken = TREDIR;
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return lasttoken;
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}
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pungetc();
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}
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quoteflag = quotef;
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backquotelist = bqlist;
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@ -10697,8 +10752,8 @@ parseredir: {
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/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
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* (assuming ascii char codes, as the original implementation did) */
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#define is_special(c) \
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((((unsigned int)c) - 33 < 32) \
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&& ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
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(((unsigned)(c) - 33 < 32) \
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&& ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
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parsesub: {
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int subtype;
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int typeloc;
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@ -10707,10 +10762,14 @@ parsesub: {
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static const char types[] ALIGN1 = "}-+?=";
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c = pgetc();
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if (
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c <= PEOA_OR_PEOF ||
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(c != '(' && c != '{' && !is_name(c) && !is_special(c))
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if (c <= PEOA_OR_PEOF
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|| (c != '(' && c != '{' && !is_name(c) && !is_special(c))
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) {
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#if ENABLE_ASH_BASH_COMPAT
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if (c == '\'')
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bash_dollar_squote = 1;
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else
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#endif
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USTPUTC('$', out);
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pungetc();
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} else if (c == '(') { /* $(command) or $((arith)) */
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9
shell/ash_test/ash-quoting/dollar_squote_bash1.right
Normal file
9
shell/ash_test/ash-quoting/dollar_squote_bash1.right
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@ -0,0 +1,9 @@
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a b
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a
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b c
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def
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a'b c"d e\f
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a3b c3b e33f
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a\80b c08b
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a3b c30b
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x y
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7
shell/ash_test/ash-quoting/dollar_squote_bash1.tests
Executable file
7
shell/ash_test/ash-quoting/dollar_squote_bash1.tests
Executable file
@ -0,0 +1,7 @@
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echo $'a\tb'
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echo $'a\nb' $'c\nd''ef'
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echo $'a\'b' $'c\"d' $'e\\f'
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echo $'a\63b' $'c\063b' $'e\0633f'
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echo $'a\80b' $'c\608b'
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echo $'a\x33b' $'c\x330b'
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echo $'x\x9y'
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