-/* $OpenBSD: eval.c,v 1.37 2011/10/11 14:32:43 otto Exp $ */
+/* $OpenBSD: eval.c,v 1.39 2013/07/01 17:25:27 jca Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
#include "sh.h"
-__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.136 2013/02/10 23:43:59 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.142 2013/07/24 18:03:57 tg Exp $");
/*
* string expansion
*/
/* expansion generator state */
-typedef struct Expand {
- /* int type; */ /* see expand() */
- const char *str; /* string */
+typedef struct {
+ /* not including an "int type;" member, see expand() */
+ /* string */
+ const char *str;
+ /* source */
union {
- const char **strv; /* string[] */
- struct shf *shf; /* file */
- } u; /* source */
- struct tbl *var; /* variable in ${var..} */
- bool split; /* split "$@" / call waitlast $() */
+ /* string[] */
+ const char **strv;
+ /* file */
+ struct shf *shf;
+ } u;
+ /* variable in ${var...} */
+ struct tbl *var;
+ /* split "$@" / call waitlast in $() */
+ bool split;
} Expand;
#define XBASE 0 /* scanning original */
static int varsub(Expand *, const char *, const char *, int *, int *);
static int comsub(Expand *, const char *, int);
-static void funsub(struct op *);
+static char *valsub(struct op *, Area *);
static char *trimsub(char *, char *, int);
static void glob(char *, XPtrV *, bool);
static void globit(XString *, char **, char *, XPtrV *, int);
} SubType;
void
-expand(const char *cp, /* input word */
- XPtrV *wp, /* output words */
- int f) /* DO* flags */
+expand(
+ /* input word */
+ const char *ccp,
+ /* output words */
+ XPtrV *wp,
+ /* DO* flags */
+ int f)
{
int c = 0;
- int type; /* expansion type */
- int quote = 0; /* quoted */
- XString ds; /* destination string */
- char *dp; /* destination */
- const char *sp; /* source */
- int fdo, word; /* second pass flags; have word */
- int doblank; /* field splitting of parameter/command subst */
+ /* expansion type */
+ int type;
+ /* quoted */
+ int quote = 0;
+ /* destination string and live pointer */
+ XString ds;
+ char *dp;
+ /* source */
+ const char *sp;
+ /* second pass flags */
+ int fdo;
+ /* have word */
+ int word;
+ /* field splitting of parameter/command substitution */
+ int doblank;
+ /* expansion variables */
Expand x = {
- /* expansion variables */
NULL, { NULL }, NULL, 0
};
SubType st_head, *st;
- /* For trailing newlines in COMSUB */
+ /* record number of trailing newlines in COMSUB */
int newlines = 0;
bool saw_eq, make_magic;
int tilde_ok;
size_t len;
+ char *cp;
- if (cp == NULL)
+ if (ccp == NULL)
internal_errorf("expand(NULL)");
/* for alias, readonly, set, typeset commands */
- if ((f & DOVACHECK) && is_wdvarassign(cp)) {
+ if ((f & DOVACHECK) && is_wdvarassign(ccp)) {
f &= ~(DOVACHECK|DOBLANK|DOGLOB|DOTILDE);
f |= DOASNTILDE;
}
/* init destination string */
Xinit(ds, dp, 128, ATEMP);
type = XBASE;
- sp = cp;
+ sp = ccp;
fdo = 0;
saw_eq = false;
/* must be 1/0 */
continue;
case COMSUB:
case FUNSUB:
+ case VALSUB:
tilde_ok = 0;
if (f & DONTRUNCOMMAND) {
word = IFS_WORD;
*dp++ = '$';
- if (c == FUNSUB) {
- *dp++ = '{';
- *dp++ = ' ';
- } else
- *dp++ = '(';
+ *dp++ = c == COMSUB ? '(' : '{';
+ if (c != COMSUB)
+ *dp++ = c == FUNSUB ? ' ' : '|';
while (*sp != '\0') {
Xcheck(ds, dp);
*dp++ = *sp++;
}
- if (c == FUNSUB) {
+ if (c != COMSUB) {
*dp++ = ';';
*dp++ = '}';
} else
*dp++ = ')';
} else {
type = comsub(&x, sp, c);
- if (type == XCOM && (f&DOBLANK))
+ if (type != XBASE && (f & DOBLANK))
doblank++;
sp = strnul(sp) + 1;
newlines = 0;
*dp++ = ')'; *dp++ = ')';
} else {
struct tbl v;
- char *p;
v.flag = DEFINED|ISSET|INTEGER;
/* not default */
v_evaluate(&v, substitute(sp, 0),
KSH_UNWIND_ERROR, true);
sp = strnul(sp) + 1;
- for (p = str_val(&v); *p; ) {
+ cp = str_val(&v);
+ while (*cp) {
Xcheck(ds, dp);
- *dp++ = *p++;
+ *dp++ = *cp++;
}
}
continue;
if (stype)
sp += slen;
switch (stype & 0x17F) {
- case 0x100 | '#':
- {
+ case 0x100 | '#': {
char *beg, *end;
mksh_ari_t seed;
register uint32_t h;
(unsigned int)h);
break;
}
- case 0x100 | 'Q':
- {
+ case 0x100 | 'Q': {
struct shf shf;
shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf);
if (c == 0) {
if (quote && !x.split)
continue;
+ /* this is so we don't terminate */
c = ' ';
+ /* now force-emit a word */
+ goto emit_word;
}
if (quote && x.split) {
/* terminate word for "$@" */
break;
case XCOM:
- if (newlines) {
- /* Spit out saved NLs */
+ if (x.u.shf == NULL) {
+ /* $(<...) failed */
+ subst_exstat = 1;
+ /* fake EOF */
+ c = EOF;
+ } else if (newlines) {
+ /* spit out saved NLs */
c = '\n';
--newlines;
} else {
while ((c = shf_getc(x.u.shf)) == 0 || c == '\n')
if (c == '\n')
- /* Save newlines */
+ /* save newlines */
newlines++;
if (newlines && c != EOF) {
shf_ungetc(c, x.u.shf);
}
if (c == EOF) {
newlines = 0;
- shf_close(x.u.shf);
+ if (x.u.shf)
+ shf_close(x.u.shf);
if (x.split)
subst_exstat = waitlast();
type = XBASE;
*/
if (word == IFS_WORD ||
(!ctype(c, C_IFSWS) && c && word == IFS_NWS)) {
- char *p;
-
+ emit_word:
*dp++ = '\0';
- p = Xclose(ds, dp);
+ cp = Xclose(ds, dp);
if (fdo & DOBRACE)
/* also does globbing */
- alt_expand(wp, p, p,
- p + Xlength(ds, (dp - 1)),
+ alt_expand(wp, cp, cp,
+ cp + Xlength(ds, (dp - 1)),
fdo | (f & DOMARKDIRS));
else if (fdo & DOGLOB)
- glob(p, wp, tobool(f & DOMARKDIRS));
+ glob(cp, wp, tobool(f & DOMARKDIRS));
else if ((f & DOPAT) || !(fdo & DOMAGIC))
- XPput(*wp, p);
+ XPput(*wp, cp);
else
- XPput(*wp, debunk(p, p, strlen(p) + 1));
+ XPput(*wp, debunk(cp, cp,
+ strlen(cp) + 1));
fdo = 0;
saw_eq = false;
tilde_ok = (f & (DOTILDE|DOASNTILDE)) ? 1 : 0;
return;
} else if (type == XSUB && ctype(c, C_IFS) &&
!ctype(c, C_IFSWS) && Xlength(ds, dp) == 0) {
- char *p;
-
- *(p = alloc(1, ATEMP)) = '\0';
- XPput(*wp, p);
+ *(cp = alloc(1, ATEMP)) = '\0';
+ XPput(*wp, cp);
type = XSUBMID;
}
if (word != IFS_NWS)
if (type == XSUB) {
if (word == IFS_NWS &&
Xlength(ds, dp) == 0) {
- char *p;
-
- *(p = alloc(1, ATEMP)) = '\0';
- XPput(*wp, p);
+ *(cp = alloc(1, ATEMP)) = '\0';
+ XPput(*wp, cp);
}
type = XSUBMID;
}
if (type == XBASE &&
(f & (DOTILDE|DOASNTILDE)) &&
(tilde_ok & 2)) {
- const char *p;
- char *dp_x;
+ const char *tcp;
+ char *tdp = dp;
- dp_x = dp;
- p = maybe_expand_tilde(sp,
- &ds, &dp_x,
+ tcp = maybe_expand_tilde(sp,
+ &ds, &tdp,
f & DOASNTILDE);
- if (p) {
- if (dp != dp_x)
+ if (tcp) {
+ if (dp != tdp)
word = IFS_WORD;
- dp = dp_x;
- sp = p;
+ dp = tdp;
+ sp = tcp;
continue;
}
}
c = sp[0];
if (c == '*' || c == '@') {
switch (stype & 0x17F) {
- case '=': /* can't assign to a vector */
- case '%': /* can't trim a vector (yet) */
+ /* can't assign to a vector */
+ case '=':
+ /* can't trim a vector (yet) */
+ case '%':
case '#':
case '0':
case '/':
XPtrV wv;
switch (stype & 0x17F) {
- case '=': /* can't assign to a vector */
- case '%': /* can't trim a vector (yet) */
+ /* can't assign to a vector */
+ case '=':
+ /* can't trim a vector (yet) */
+ case '%':
case '#':
case '?':
case '0':
shf = shf_open(name = evalstr(io->name, DOTILDE), O_RDONLY, 0,
SHF_MAPHI|SHF_CLEXEC);
if (shf == NULL)
- errorf("%s: %s %s", name, "can't open", "$() input");
+ warningf(!Flag(FTALKING), "%s: %s %s: %s", name,
+ "can't open", "$(<...) input", cstrerror(errno));
} else if (fn == FUNSUB) {
int ofd1;
struct temp *tf = NULL;
- /* create a temporary file, open for writing */
+ /*
+ * create a temporary file, open for reading and writing,
+ * with an shf open for reading (buffered) but yet unused
+ */
maketemp(ATEMP, TT_FUNSUB, &tf);
if (!tf->shf) {
errorf("can't %s temporary file %s: %s",
"create", tf->tffn, cstrerror(errno));
}
- /* save stdout and make the temporary file it */
+ /* extract shf from temporary file, unlink and free it */
+ shf = tf->shf;
+ unlink(tf->tffn);
+ afree(tf, ATEMP);
+ /* save stdout and let it point to the tempfile */
ofd1 = savefd(1);
- ksh_dup2(shf_fileno(tf->shf), 1, false);
+ ksh_dup2(shf_fileno(shf), 1, false);
/*
* run tree, with output thrown into the tempfile,
* in a new function block
*/
- funsub(t);
+ valsub(t, NULL);
subst_exstat = exstat & 0xFF;
- /* close the tempfile and restore regular stdout */
- shf_close(tf->shf);
+ /* rewind the tempfile and restore regular stdout */
+ lseek(shf_fileno(shf), (off_t)0, SEEK_SET);
restfd(1, ofd1);
- /* now open, unlink and free the tempfile for reading */
- shf = shf_open(tf->tffn, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
- unlink(tf->tffn);
- afree(tf, ATEMP);
+ } else if (fn == VALSUB) {
+ xp->str = valsub(t, ATEMP);
+ subst_exstat = exstat & 0xFF;
+ return (XSUB);
} else {
int ofd1, pv[2];
*/
if ((check & GF_EXCHECK) ||
((check & GF_MARKDIR) && (check & GF_GLOBBED))) {
-#define stat_check() (stat_done ? stat_done : \
- (stat_done = stat(Xstring(*xs, xp), &statb) < 0 \
- ? -1 : 1))
+#define stat_check() (stat_done ? stat_done : (stat_done = \
+ stat(Xstring(*xs, xp), &statb) < 0 ? -1 : 1))
struct stat lstatb, statb;
- int stat_done = 0; /* -1: failed, 1 ok */
+ /* -1: failed, 1 ok, 0 not yet done */
+ int stat_done = 0;
if (mksh_lstat(Xstring(*xs, xp), &lstatb) < 0)
return;
}
/* helper function due to setjmp/longjmp woes */
-static void
-funsub(struct op *t)
+static char *
+valsub(struct op *t, Area *ap)
{
+ char * volatile cp = NULL;
+ struct tbl * volatile vp = NULL;
+
+ newenv(E_FUNC);
newblock();
- e->type = E_FUNC;
+ if (ap)
+ vp = local("REPLY", false);
if (!kshsetjmp(e->jbuf))
execute(t, XXCOM | XERROK, NULL);
- popblock();
+ if (vp)
+ strdupx(cp, str_val(vp), ap);
+ quitenv(NULL);
+
+ return (cp);
}
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