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-rw-r--r--shell/ash.c164
1 files changed, 66 insertions, 98 deletions
diff --git a/shell/ash.c b/shell/ash.c
index 33a477d..e7e7081 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -598,8 +598,6 @@ out2str(const char *p)
#define CTLVAR ((unsigned char)'\202') /* variable defn */
#define CTLENDVAR ((unsigned char)'\203')
#define CTLBACKQ ((unsigned char)'\204')
-#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
-/* CTLBACKQ | CTLQUOTE == '\205' */
#define CTLARI ((unsigned char)'\206') /* arithmetic expression */
#define CTLENDARI ((unsigned char)'\207')
#define CTLQUOTEMARK ((unsigned char)'\210')
@@ -608,7 +606,6 @@ out2str(const char *p)
/* variable substitution byte (follows CTLVAR) */
#define VSTYPE 0x0f /* type of variable substitution */
#define VSNUL 0x10 /* colon--treat the empty string as unset */
-#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
/* values of VSTYPE field */
#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
@@ -628,8 +625,9 @@ out2str(const char *p)
#endif
static const char dolatstr[] ALIGN1 = {
- CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
+ CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
};
+#define DOLATSTRLEN 6
#define NCMD 0
#define NPIPE 1
@@ -865,9 +863,7 @@ trace_puts_quoted(char *s)
case '\\': c = '\\'; goto backslash;
case CTLESC: c = 'e'; goto backslash;
case CTLVAR: c = 'v'; goto backslash;
- case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
case CTLBACKQ: c = 'q'; goto backslash;
- case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
backslash:
putc('\\', tracefile);
putc(c, tracefile);
@@ -1030,7 +1026,6 @@ sharg(union node *arg, FILE *fp)
putc('}', fp);
break;
case CTLBACKQ:
- case CTLBACKQ|CTLQUOTE:
putc('$', fp);
putc('(', fp);
shtree(bqlist->n, -1, NULL, fp);
@@ -4413,11 +4408,7 @@ cmdputs(const char *s)
str = "${#";
else
str = "${";
- if (!(subtype & VSQUOTE) == !(quoted & 1))
- goto dostr;
- quoted ^= 1;
- c = '"';
- break;
+ goto dostr;
case CTLENDVAR:
str = "\"}" + !(quoted & 1);
quoted >>= 1;
@@ -4426,9 +4417,6 @@ cmdputs(const char *s)
case CTLBACKQ:
str = "$(...)";
goto dostr;
- case CTLBACKQ+CTLQUOTE:
- str = "\"$(...)\"";
- goto dostr;
#if ENABLE_SH_MATH_SUPPORT
case CTLARI:
str = "$((";
@@ -5526,7 +5514,7 @@ ash_arith(const char *s)
#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
-#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
+#define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
#define EXP_WORD 0x80 /* expand word in parameter expansion */
#define EXP_QUOTED 0x100 /* expand word in double quotes */
@@ -5535,12 +5523,11 @@ ash_arith(const char *s)
*/
#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
-#define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
/* Add CTLESC when necessary. */
-#define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_REDIR)
+#define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR)
/* Do not skip NUL characters. */
#define QUOTES_KEEPNUL EXP_TILDE
@@ -5641,13 +5628,11 @@ rmescapes(char *str, int flag)
}
}
- inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
+ inquotes = 0;
globbing = flag & RMESCAPE_GLOB;
protect_against_glob = globbing;
while (*p) {
if ((unsigned char)*p == CTLQUOTEMARK) {
-// TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
-// (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
// Note: both inquotes and protect_against_glob only affect whether
// CTLESC,<ch> gets converted to <ch> or to \<ch>
inquotes = ~inquotes;
@@ -5655,16 +5640,15 @@ rmescapes(char *str, int flag)
protect_against_glob = globbing;
continue;
}
- if (*p == '\\') {
- /* naked back slash */
- protect_against_glob = 0;
- goto copy;
- }
if ((unsigned char)*p == CTLESC) {
p++;
- if (protect_against_glob && inquotes && *p != '/') {
+ if (protect_against_glob) {
*q++ = '\\';
}
+ } else if (*p == '\\' && !inquotes) {
+ /* naked back slash */
+ protect_against_glob = 0;
+ goto copy;
}
protect_against_glob = globbing;
copy:
@@ -5685,13 +5669,9 @@ rmescapes(char *str, int flag)
* Returns an stalloced string.
*/
static char *
-preglob(const char *pattern, int quoted, int flag)
+preglob(const char *pattern, int flag)
{
- flag |= RMESCAPE_GLOB;
- if (quoted) {
- flag |= RMESCAPE_QUOTED;
- }
- return rmescapes((char *)pattern, flag);
+ return rmescapes((char *)pattern, flag | RMESCAPE_GLOB);
}
/*
@@ -5712,7 +5692,9 @@ memtodest(const char *p, size_t len, int syntax, int quotes)
if (c) {
int n = SIT(c, syntax);
if ((quotes & QUOTES_ESC) &&
- (n == CCTL || n == CBACK))
+ ((n == CCTL) ||
+ (((quotes & EXP_FULL) || syntax != BASESYNTAX) &&
+ n == CBACK)))
USTPUTC(CTLESC, q);
} else if (!(quotes & QUOTES_KEEPNUL))
continue;
@@ -5905,7 +5887,7 @@ evalbackcmd(union node *n, struct backcmd *result)
* Expand stuff in backwards quotes.
*/
static void
-expbackq(union node *cmd, int quoted, int quotes)
+expbackq(union node *cmd, int flag)
{
struct backcmd in;
int i;
@@ -5913,7 +5895,7 @@ expbackq(union node *cmd, int quoted, int quotes)
char *p;
char *dest;
int startloc;
- int syntax = quoted ? DQSYNTAX : BASESYNTAX;
+ int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
struct stackmark smark;
INT_OFF;
@@ -5929,7 +5911,7 @@ expbackq(union node *cmd, int quoted, int quotes)
if (i == 0)
goto read;
for (;;) {
- memtodest(p, i, syntax, quotes);
+ memtodest(p, i, syntax, flag & QUOTES_ESC);
read:
if (in.fd < 0)
break;
@@ -5953,7 +5935,7 @@ expbackq(union node *cmd, int quoted, int quotes)
STUNPUTC(dest);
expdest = dest;
- if (quoted == 0)
+ if (!(flag & EXP_QUOTED))
recordregion(startloc, dest - (char *)stackblock(), 0);
TRACE(("evalbackq: size:%d:'%.*s'\n",
(int)((dest - (char *)stackblock()) - startloc),
@@ -5967,11 +5949,10 @@ expbackq(union node *cmd, int quoted, int quotes)
* evaluate, place result in (backed up) result, adjust string position.
*/
static void
-expari(int quotes)
+expari(int flag)
{
char *p, *start;
int begoff;
- int flag;
int len;
/* ifsfree(); */
@@ -6009,16 +5990,14 @@ expari(int quotes)
removerecordregions(begoff);
- flag = p[1];
-
expdest = p;
- if (quotes)
- rmescapes(p + 2, 0);
+ if (flag & QUOTES_ESC)
+ rmescapes(p + 1, 0);
- len = cvtnum(ash_arith(p + 2));
+ len = cvtnum(ash_arith(p + 1));
- if (flag != '"')
+ if (!(flag & EXP_QUOTED))
recordregion(begoff, begoff + len, 0);
}
#endif
@@ -6046,14 +6025,12 @@ argstr(char *p, int flags, struct strlist *var_str_list)
CTLESC,
CTLVAR,
CTLBACKQ,
- CTLBACKQ | CTLQUOTE,
#if ENABLE_SH_MATH_SUPPORT
CTLENDARI,
#endif
'\0'
};
const char *reject = spclchars;
- int quotes = flags & QUOTES_ESC;
int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
int inquotes;
size_t length;
@@ -6128,19 +6105,14 @@ argstr(char *p, int flags, struct strlist *var_str_list)
case CTLENDVAR: /* ??? */
goto breakloop;
case CTLQUOTEMARK:
+ inquotes ^= EXP_QUOTED;
/* "$@" syntax adherence hack */
- if (!inquotes
- && memcmp(p, dolatstr, 4) == 0
- && ( p[4] == (char)CTLQUOTEMARK
- || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
- )
- ) {
- p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
+ if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
+ p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1;
goto start;
}
- inquotes = !inquotes;
addquote:
- if (quotes) {
+ if (flags & QUOTES_ESC) {
p--;
length++;
startloc++;
@@ -6149,22 +6121,30 @@ argstr(char *p, int flags, struct strlist *var_str_list)
case CTLESC:
startloc++;
length++;
+
+ /*
+ * Quoted parameter expansion pattern: remove quote
+ * unless inside inner quotes or we have a literal
+ * backslash.
+ */
+ if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) ==
+ EXP_QPAT && *p != '\\')
+ break;
+
goto addquote;
case CTLVAR:
TRACE(("argstr: evalvar('%s')\n", p));
- p = evalvar(p, flags, var_str_list);
+ p = evalvar(p, flags | inquotes, var_str_list);
TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
goto start;
case CTLBACKQ:
- c = '\0';
- case CTLBACKQ|CTLQUOTE:
- expbackq(argbackq->n, c, quotes);
+ expbackq(argbackq->n, flags | inquotes);
argbackq = argbackq->next;
goto start;
#if ENABLE_SH_MATH_SUPPORT
case CTLENDARI:
p--;
- expari(quotes);
+ expari(flags | inquotes);
goto start;
#endif
}
@@ -6296,13 +6276,13 @@ varunset(const char *end, const char *var, const char *umsg, int varflags)
#if ENABLE_ASH_BASH_COMPAT
static char *
-parse_sub_pattern(char *arg, int varflags)
+parse_sub_pattern(char *arg, int quoted)
{
char *idx, *repl = NULL;
unsigned char c;
//char *org_arg = arg;
- //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
+ //bb_error_msg("arg:'%s' quoted:%x", arg, quoted);
idx = arg;
while (1) {
c = *arg;
@@ -6318,7 +6298,7 @@ parse_sub_pattern(char *arg, int varflags)
*idx++ = c;
arg++;
/*
- * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
+ * Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
* The result is a_\_z_c (not a\_\_z_c)!
*
* Enable debug prints in this function and you'll see:
@@ -6328,7 +6308,7 @@ parse_sub_pattern(char *arg, int varflags)
* IOW: search pattern and replace string treat backslashes
* differently! That is the reason why we check repl below:
*/
- if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
+ if (c == '\\' && *arg == '\\' && repl && !quoted)
arg++; /* skip both '\', not just first one */
}
*idx = c; /* NUL */
@@ -6340,9 +6320,10 @@ parse_sub_pattern(char *arg, int varflags)
static const char *
subevalvar(char *p, char *varname, int strloc, int subtype,
- int startloc, int varflags, int quotes, struct strlist *var_str_list)
+ int startloc, int varflags, int flag, struct strlist *var_str_list)
{
struct nodelist *saveargbackq = argbackq;
+ int quotes = flag & QUOTES_ESC;
char *startp;
char *loc;
char *rmesc, *rmescend;
@@ -6360,7 +6341,8 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
herefd = -1;
argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ?
- EXP_CASE : 0), var_str_list);
+ (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0),
+ var_str_list);
STPUTC('\0', expdest);
herefd = saveherefd;
argbackq = saveargbackq;
@@ -6471,7 +6453,7 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
}
rmescend--;
str = (char *)stackblock() + strloc;
- preglob(str, varflags & VSQUOTE, 0);
+ preglob(str, 0);
#if ENABLE_ASH_BASH_COMPAT
workloc = expdest - (char *)stackblock();
@@ -6479,7 +6461,7 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
char *idx, *end;
if (!repl) {
- repl = parse_sub_pattern(str, varflags);
+ repl = parse_sub_pattern(str, flag & EXP_QUOTED);
//bb_error_msg("repl:'%s'", repl);
if (!repl)
repl = nullstr;
@@ -6618,7 +6600,7 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
int i;
ssize_t len = 0;
int sep;
- int quoted = varflags & VSQUOTE;
+ int quoted = flags & EXP_QUOTED;
int subtype = varflags & VSTYPE;
int discard = subtype == VSPLUS || subtype == VSLENGTH;
int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
@@ -6758,7 +6740,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
{
char varflags;
char subtype;
- char quoted;
+ int quoted;
char easy;
char *var;
int patloc;
@@ -6767,7 +6749,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
varflags = (unsigned char) *p++;
subtype = varflags & VSTYPE;
- quoted = varflags & VSQUOTE;
+ quoted = flags & EXP_QUOTED;
var = p;
easy = (!quoted || (*var == '@' && shellparam.nparam));
startloc = expdest - (char *)stackblock();
@@ -6788,7 +6770,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
if (varlen < 0) {
argstr(
p,
- flags | EXP_TILDE | EXP_WORD | (quoted ? EXP_QUOTED : 0),
+ flags | EXP_TILDE | EXP_WORD,
var_str_list
);
goto end;
@@ -6802,7 +6784,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
if (varlen < 0) {
if (subevalvar(p, var, /* strloc: */ 0,
subtype, startloc, varflags,
- /* quotes: */ 0,
+ /* quotes: */ flags & ~QUOTES_ESC,
var_str_list)
) {
varflags &= ~VSNUL;
@@ -6859,10 +6841,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
STPUTC('\0', expdest);
patloc = expdest - (char *)stackblock();
if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
- startloc, varflags,
- /* quotes: */ flags & QUOTES_ESC,
- var_str_list)
- ) {
+ startloc, varflags, flags, var_str_list)) {
int amount = expdest - (
(char *)stackblock() + patloc - 1
);
@@ -6881,7 +6860,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
unsigned char c = *p++;
if (c == CTLESC)
p++;
- else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
+ else if (c == CTLBACKQ) {
if (varlen >= 0)
argbackq = argbackq->next;
} else if (c == CTLVAR) {
@@ -7217,7 +7196,7 @@ expandmeta(struct strlist *str /*, int flag*/)
savelastp = exparg.lastp;
INT_OFF;
- p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
+ p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
{
int i = strlen(str->text);
expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
@@ -7307,7 +7286,7 @@ static void
expandhere(union node *arg, int fd)
{
herefd = fd;
- expandarg(arg, (struct arglist *)NULL, 0);
+ expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
full_write(fd, stackblock(), expdest - (char *)stackblock());
}
@@ -7317,7 +7296,7 @@ expandhere(union node *arg, int fd)
static int
patmatch(char *pattern, const char *string)
{
- return pmatch(preglob(pattern, 0, 0), string);
+ return pmatch(preglob(pattern, 0), string);
}
/*
@@ -8570,7 +8549,7 @@ evalfor(union node *n, int flags)
arglist.list = NULL;
arglist.lastp = &arglist.list;
for (argp = n->nfor.args; argp; argp = argp->narg.next) {
- expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
/* XXX */
if (evalskip)
goto out;
@@ -11260,11 +11239,9 @@ readtoken1(int c, int syntax, char *eofmark, int striptabs)
&& c != '$'
&& (c != '"' || eofmark != NULL)
) {
- USTPUTC(CTLESC, out);
USTPUTC('\\', out);
}
- if (SIT(c, SQSYNTAX) == CCTL)
- USTPUTC(CTLESC, out);
+ USTPUTC(CTLESC, out);
USTPUTC(c, out);
quotef = 1;
}
@@ -11637,8 +11614,6 @@ parsesub: {
do_pungetc:
pungetc();
}
- if (dblquote || arinest)
- flags |= VSQUOTE;
((unsigned char *)stackblock())[typeloc] = subtype | flags;
if (subtype != VSNORMAL) {
varnest++;
@@ -11792,10 +11767,7 @@ parsebackq: {
}
parsebackquote = savepbq;
exception_handler = savehandler;
- if (arinest || dblquote)
- USTPUTC(CTLBACKQ | CTLQUOTE, out);
- else
- USTPUTC(CTLBACKQ, out);
+ USTPUTC(CTLBACKQ, out);
if (oldstyle)
goto parsebackq_oldreturn;
goto parsebackq_newreturn;
@@ -11811,10 +11783,6 @@ parsearith: {
syntax = ARISYNTAX;
}
USTPUTC(CTLARI, out);
- if (dblquote)
- USTPUTC('"', out);
- else
- USTPUTC(' ', out);
goto parsearith_return;
}
#endif
@@ -12129,7 +12097,7 @@ expandstr(const char *ps)
n.narg.text = wordtext;
n.narg.backquote = backquotelist;
- expandarg(&n, NULL, 0);
+ expandarg(&n, NULL, EXP_QUOTED);
return stackblock();
}
#endif
generated by cgit v1.1 at 2024-12-25 16:33:26 +0000