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
diff --git a/shell/ash.c b/shell/ash.c
index 7924c4d..8a731fd 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1460,19 +1460,19 @@
if (l > m) \
(p) = makestrspace(l, q); \
} while (0)
-#define USTPUTC(c, p) (*p++ = (c))
+#define USTPUTC(c, p) (*(p)++ = (c))
#define STACKSTRNUL(p) \
do { \
if ((p) == sstrend) \
- p = growstackstr(); \
- *p = '\0'; \
+ (p) = growstackstr(); \
+ *(p) = '\0'; \
} while (0)
-#define STUNPUTC(p) (--p)
-#define STTOPC(p) (p[-1])
-#define STADJUST(amount, p) (p += (amount))
+#define STUNPUTC(p) (--(p))
+#define STTOPC(p) ((p)[-1])
+#define STADJUST(amount, p) ((p) += (amount))
#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
-#define ungrabstackstr(s, p) stunalloc((s))
+#define ungrabstackstr(s, p) stunalloc(s)
#define stackstrend() ((void *)sstrend)
@@ -2687,10 +2687,10 @@
) {
return CCTL;
} else {
- s = strchr(spec_symbls, c);
- if (s == NULL || *s == '\0')
+ s = strchrnul(spec_symbls, c);
+ if (*s == '\0')
return CWORD;
- indx = syntax_index_table[(s - spec_symbls)];
+ indx = syntax_index_table[s - spec_symbls];
}
return S_I_T[indx][syntax];
}
@@ -4201,7 +4201,7 @@
nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
p = s;
while ((c = *p++) != 0) {
- str = 0;
+ str = NULL;
switch (c) {
case CTLESC:
c = *p++;
@@ -10345,6 +10345,52 @@
return n1;
}
+#if ENABLE_ASH_BASH_COMPAT
+static int decode_dollar_squote(void)
+{
+ static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
+ int c, cnt;
+ char *p;
+ char buf[4];
+
+ c = pgetc();
+ p = strchr(C_escapes, c);
+ if (p) {
+ buf[0] = c;
+ p = buf;
+ cnt = 3;
+ if ((unsigned char)(c - '0') <= 7) { /* \ooo */
+ do {
+ c = pgetc();
+ *++p = c;
+ } while ((unsigned char)(c - '0') <= 7 && --cnt);
+ pungetc();
+ } else if (c == 'x') { /* \xHH */
+ do {
+ c = pgetc();
+ *++p = c;
+ } while (isxdigit(c) && --cnt);
+ pungetc();
+ if (cnt == 3) { /* \x but next char is "bad" */
+ c = 'x';
+ goto unrecognized;
+ }
+ } else { /* simple seq like \\ or \t */
+ p++;
+ }
+ *p = '\0';
+ p = buf;
+ c = bb_process_escape_sequence((void*)&p);
+ } else { /* unrecognized "\z": print both chars unless ' or " */
+ if (c != '\'' && c != '"') {
+ unrecognized:
+ c |= 0x100; /* "please encode \, then me" */
+ }
+ }
+ return c;
+}
+#endif
+
/*
* If eofmark is NULL, read a word or a redirection symbol. If eofmark
* is not NULL, read a here document. In the latter case, eofmark is the
@@ -10356,14 +10402,12 @@
* using goto's to implement the subroutine linkage. The following macros
* will run code that appears at the end of readtoken1.
*/
-
#define CHECKEND() {goto checkend; checkend_return:;}
#define PARSEREDIR() {goto parseredir; parseredir_return:;}
#define PARSESUB() {goto parsesub; parsesub_return:;}
#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
#define PARSEARITH() {goto parsearith; parsearith_return:;}
-
static int
readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
{
@@ -10385,6 +10429,8 @@
int parenlevel; /* levels of parens in arithmetic */
int dqvarnest; /* levels of variables expansion within double quotes */
+ USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
+
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &out;
@@ -10435,6 +10481,15 @@
case CCTL:
if (eofmark == NULL || dblquote)
USTPUTC(CTLESC, out);
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '\\' && bash_dollar_squote) {
+ c = decode_dollar_squote();
+ if (c & 0x100) {
+ USTPUTC('\\', out);
+ c = (unsigned char)c;
+ }
+ }
+#endif
USTPUTC(c, out);
break;
case CBACK: /* backslash */
@@ -10453,11 +10508,9 @@
USTPUTC('\\', out);
}
#endif
- if (dblquote &&
- c != '\\' && c != '`' &&
- c != '$' && (
- c != '"' ||
- eofmark != NULL)
+ if (dblquote && c != '\\'
+ && c != '`' && c != '$'
+ && (c != '"' || eofmark != NULL)
) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
@@ -10480,6 +10533,7 @@
dblquote = 1;
goto quotemark;
case CENDQUOTE:
+ USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
if (eofmark != NULL && arinest == 0
&& varnest == 0
) {
@@ -10552,7 +10606,7 @@
}
c = pgetc_macro();
- }
+ } /* for(;;) */
}
endword:
#if ENABLE_ASH_MATH_SUPPORT
@@ -10573,12 +10627,13 @@
if ((c == '>' || c == '<')
&& quotef == 0
&& len <= 2
- && (*out == '\0' || isdigit(*out))) {
+ && (*out == '\0' || isdigit(*out))
+ ) {
PARSEREDIR();
- return lasttoken = TREDIR;
- } else {
- pungetc();
+ lasttoken = TREDIR;
+ return lasttoken;
}
+ pungetc();
}
quoteflag = quotef;
backquotelist = bqlist;
@@ -10697,8 +10752,8 @@
/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
* (assuming ascii char codes, as the original implementation did) */
#define is_special(c) \
- ((((unsigned int)c) - 33 < 32) \
- && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
+ (((unsigned)(c) - 33 < 32) \
+ && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
parsesub: {
int subtype;
int typeloc;
@@ -10707,11 +10762,15 @@
static const char types[] ALIGN1 = "}-+?=";
c = pgetc();
- if (
- c <= PEOA_OR_PEOF ||
- (c != '(' && c != '{' && !is_name(c) && !is_special(c))
+ if (c <= PEOA_OR_PEOF
+ || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
) {
- USTPUTC('$', out);
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '\'')
+ bash_dollar_squote = 1;
+ else
+#endif
+ USTPUTC('$', out);
pungetc();
} else if (c == '(') { /* $(command) or $((arith)) */
if (pgetc() == '(') {
