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var.c
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var.c
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/* $OpenBSD: var.c,v 1.44 2015/09/10 11:37:42 jca Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
* 2019, 2021, 2022, 2023
* mirabilos <m@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#include "sh.h"
#include "mirhash.h"
__RCSID("$MirOS: src/bin/mksh/var.c,v 1.283 2024/02/02 04:04:22 tg Exp $");
/*-
* Variables
*
* WARNING: unreadable code, needs a rewrite
*
* if (flag&INTEGER), val.i contains integer value, and type contains base.
* otherwise, (val.s + type) contains string value.
* if (flag&EXPORT), val.s contains "name=value" for E-Z exporting.
*/
static struct table specials;
static k32 lcg_state = 5381U, qh_state = 4711U;
/* may only be set by typeset() just before call to array_index_calc() */
static enum namerefflag innermost_refflag = SRF_NOP;
/*
* Evil hack since casting uint to sint is implementation-defined
*/
typedef union {
mksh_ari_t i;
mksh_uari_t u;
} mksh_ari_u;
static void c_typeset_vardump(struct tbl *, kui, int, int, Wahr, Wahr);
static void c_typeset_vardump_recursive(struct block *, kui, int, Wahr,
Wahr);
static char *formatstr(struct tbl *, const char *);
static void exportprep(struct tbl *, const char *, size_t);
static int special(const char *);
static void unspecial(const char *);
static void getspec(struct tbl *);
static void setspec(struct tbl *);
static void unsetspec(struct tbl *, Wahr);
static int getint(struct tbl *, mksh_ari_u *, Wahr);
static int getnum(const char *, mksh_ari_u *, Wahr, Wahr);
static const char *array_index_calc(const char *, Wahr *, k32 *);
static struct tbl *vtypeset(int *, const char *, kui, kui, int, int);
/*
* create a new block for function calls and simple commands
* assume caller has allocated and set up e->loc
*/
/* pre-initio() */
void
newblock(void)
{
struct block *l;
static const char *empty[] = { null, NULL };
l = alloc(sizeof(struct block), ATEMP);
l->flags = 0;
/* TODO: could use e->area (l->area => l->areap) */
ainit(&l->area);
if (!e->loc) {
l->argc = 0;
l->argv = empty;
} else {
l->argc = e->loc->argc;
l->argv = e->loc->argv;
}
l->exit = l->error = NULL;
ktinit(&l->area, &l->vars, 0);
ktinit(&l->area, &l->funs, 0);
l->next = e->loc;
e->loc = l;
}
/*
* pop a block handling special variables
*/
void
popblock(void)
{
ssize_t i;
struct block *l = e->loc;
struct tbl *vp, **vpp = l->vars.tbls, *vq;
/* pop block */
e->loc = l->next;
i = 1 << (l->vars.tshift);
while (--i >= 0)
if ((vp = *vpp++) != NULL && (vp->flag&SPECIAL)) {
if ((vq = global(vp->name))->flag & ISSET)
setspec(vq);
else
unsetspec(vq, Nee);
}
if (l->flags & BF_DOGETOPTS)
user_opt = l->getopts_state;
afreeall(&l->area);
afree(l, ATEMP);
}
/* called by main() to initialise variable data structures */
#define VARSPEC_DEFNS
#include "var_spec.h"
enum var_specs {
#define VARSPEC_ENUMS
#include "var_spec.h"
V_MAX
};
/* this is biased with -1 relative to VARSPEC_ENUMS */
static const char * const initvar_names[] = {
#define VARSPEC_ITEMS
#include "var_spec.h"
};
void
initvar(void)
{
int i = 0;
struct tbl *tp;
ktinit(APERM, &specials,
/* currently 21 specials: 75% of 32 = 2^5 */
5);
while (i < V_MAX - 1) {
tp = ktenter(&specials, initvar_names[i],
hash(initvar_names[i]));
tp->flag = DEFINED|ISSET;
tp->type = ++i;
}
}
/* common code for several functions below and c_typeset() */
struct block *
varsearch(struct block *l, struct tbl **vpp, const char *vn, k32 h)
{
register struct tbl *vp;
if (l) {
varsearch_loop:
if ((vp = ktsearch(&l->vars, vn, h)) != NULL)
goto varsearch_out;
if (l->next != NULL) {
l = l->next;
goto varsearch_loop;
}
}
vp = NULL;
varsearch_out:
*vpp = vp;
return (l);
}
/*
* Used to calculate an array index for global()/local(). Sets *arrayp
* to true if this is an array, sets *idxp to the array index, returns
* the basename of the array. May only be called from global()/local()
* and must be their first callee.
*/
static const char *
array_index_calc(const char *n, Wahr *arrayp, k32 *idxp)
{
const char *p;
size_t len;
char *ap = NULL;
*arrayp = Nee;
redo_from_ref:
p = skip_varname(n, Nee);
if ((size_t)(p - n) > (size_t)(INT_MAX - X_EXTRA))
kerrf(KWF_ERR(255) | KWF_PREFIX | KWF_FILELINE | KWF_ONEMSG |
KWF_NOERRNO, "parameter name too long");
if (innermost_refflag == SRF_NOP && (p != n) && ctype(n[0], C_ALPHX)) {
struct tbl *vp;
char *vn;
strndupx(vn, n, p - n, ATEMP);
/* check if this is a reference */
varsearch(e->loc, &vp, vn, hash(vn));
afree(vn, ATEMP);
if (vp && (vp->flag & (DEFINED | ASSOC | ARRAY)) ==
(DEFINED | ASSOC)) {
char *cp;
/* gotcha! */
strdup2x(cp, str_val(vp), p);
afree(ap, ATEMP);
n = ap = cp;
goto redo_from_ref;
}
}
innermost_refflag = SRF_NOP;
if (p != n && ord(*p) == ORD('[') && (len = array_ref_len(p))) {
char *sub, *tmp;
mksh_ari_u rval;
size_t tmplen = p - n;
/* calculate the value of the subscript */
*arrayp = Ja;
len -= 2;
tmp = alloc((len > tmplen ? len : tmplen) + 1, ATEMP);
memcpy(tmp, p + 1, len);
tmp[len] = '\0';
sub = substitute(tmp, 0);
evaluate(sub, &rval.i, KSH_UNWIND_ERROR, Ja);
*idxp = mbiMM(k32, K32_FM, rval.u);
afree(sub, ATEMP);
memcpy(tmp, n, tmplen);
tmp[tmplen] = '\0';
n = tmp;
}
return (n);
}
#define vn vname.ro
/*
* Search for variable, if not found create globally.
*/
struct tbl *
global(const char *n)
{
return (isglobal(n, Ja));
}
/* search for variable; if not found, return NULL or create globally */
struct tbl *
isglobal(const char *n, Wahr docreate)
{
struct tbl *vp;
union mksh_cchack vname;
struct block *l = e->loc;
int c;
Wahr array;
k32 h;
k32 idx;
/*
* check to see if this is an array;
* dereference namerefs; must come first
*/
vn = array_index_calc(n, &array, &idx);
h = hash(vn);
c = (unsigned char)vn[0];
if (!ctype(c, C_ALPHX)) {
if (array)
kerrf(KWF_ERR(1) | KWF_PREFIX | KWF_FILELINE |
KWF_ONEMSG | KWF_NOERRNO, Tbadsubst);
vp = vtemp;
vp->flag = DEFINED;
vp->type = 0;
vp->areap = ATEMP;
if (ctype(c, C_DIGIT)) {
if (getn(vn, &c)) {
/* main.c:main_init() says 12 */
shf_snprintf(vp->name, 12, Tf_d, c);
if (c <= l->argc) {
/* setstr can't fail here */
setstr(vp, l->argv[c],
KSH_RETURN_ERROR);
}
} else
vp->name[0] = '\0';
vp->flag |= RDONLY;
goto out;
}
vp->name[0] = c;
vp->name[1] = '\0';
vp->flag |= RDONLY;
if (!c || vn[1] != '\0')
goto out;
vp->flag |= ISSET|INTEGER;
switch (c) {
case '$':
vp->val.i = kshpid;
break;
case '!':
/* if no job, expand to nothing */
if ((vp->val.i = j_async()) == 0)
vp->flag &= ~(ISSET|INTEGER);
break;
case '?':
vp->val.i = exstat & 0xFF;
break;
case '#':
vp->val.i = l->argc;
break;
case '-':
vp->flag &= ~INTEGER;
vp->val.s = getoptions();
break;
default:
vp->flag &= ~(ISSET|INTEGER);
}
goto out;
}
l = varsearch(e->loc, &vp, vn, h);
if (vp == NULL && docreate)
vp = ktenter(&l->vars, vn, h);
else
docreate = Nee;
if (vp != NULL) {
if (array)
vp = arraysearch(vp, idx);
if (docreate) {
vp->flag |= DEFINED;
if (special(vn))
vp->flag |= SPECIAL;
}
}
out:
last_lookup_was_array = array;
if (vn != n)
afree(vname.rw, ATEMP);
return (vp);
}
/*
* Search for local variable, if not found create locally.
*/
struct tbl *
local(const char *n, Wahr copy)
{
struct tbl *vp;
union mksh_cchack vname;
struct block *l = e->loc;
Wahr array;
k32 h;
k32 idx;
/*
* check to see if this is an array;
* dereference namerefs; must come first
*/
vn = array_index_calc(n, &array, &idx);
h = hash(vn);
if (!ctype(*vn, C_ALPHX)) {
vp = vtemp;
vp->flag = DEFINED|RDONLY;
vp->type = 0;
vp->areap = ATEMP;
goto out;
}
vp = ktenter(&l->vars, vn, h);
if (copy && !(vp->flag & DEFINED)) {
struct tbl *vq;
varsearch(l->next, &vq, vn, h);
if (vq != NULL) {
vp->flag |= vq->flag &
(EXPORT | INTEGER | RDONLY | LJUST | RJUST |
ZEROFIL | LCASEV | UCASEV_AL | INT_U | INT_L);
if (vq->flag & INTEGER)
vp->type = vq->type;
vp->u2.field = vq->u2.field;
}
}
if (array)
vp = arraysearch(vp, idx);
vp->flag |= DEFINED;
if (special(vn))
vp->flag |= SPECIAL;
out:
last_lookup_was_array = array;
if (vn != n)
afree(vname.rw, ATEMP);
return (vp);
}
#undef vn
/* get variable string value */
char *
str_val(struct tbl *vp)
{
char *s;
if ((vp->flag&SPECIAL))
getspec(vp);
if (!(vp->flag&ISSET))
/* special to dollar() */
s = null;
else if (!(vp->flag&INTEGER))
/* string source */
s = vp->val.s + vp->type;
else {
/* integer source */
mksh_uari_t n;
unsigned int base;
/**
* worst case number length is when base == 2:
* 1 (minus) + 2 (base, up to 36) + 1 ('#') +
* number of bits in the mksh_uari_t + 1 (NUL)
*/
char strbuf[1 + 2 + 1 + 8 * sizeof(mksh_uari_t) + 1];
const char *digits = (vp->flag & UCASEV_AL) ?
digits_uc : digits_lc;
s = strbuf + sizeof(strbuf);
if (vp->flag & INT_U)
n = vp->val.u;
else
n = (vp->val.i < 0) ? -vp->val.u : vp->val.u;
base = (vp->type == 0) ? 10U : (unsigned int)vp->type;
if (base == 1) {
s = strbuf;
s[1] = '#';
if (n == 0) {
s[0] = '2';
s[2] = '0';
s[3] = '\0';
} else {
s[0] = '1';
s[2 + ez_ctomb(s + 2, n)] = '\0';
}
} else {
*--s = '\0';
do {
*--s = digits[n % base];
n /= base;
} while (n != 0);
if (base != 10) {
*--s = '#';
*--s = digits[base % 10];
if (base >= 10)
*--s = digits[base / 10];
}
if (!(vp->flag & INT_U) && vp->val.i < 0)
*--s = '-';
}
if (vp->flag & (RJUST|LJUST))
/* case already dealt with */
s = formatstr(vp, s);
else
strdupx(s, s, ATEMP);
}
return (s);
}
/* set variable to string value */
int
setstr(struct tbl *vq, const char *s, int error_ok)
{
Wahr no_ro_check = isWahr(error_ok & 0x4);
error_ok &= ~0x4;
if ((vq->flag & RDONLY) && !no_ro_check) {
kwarnf((error_ok ? KWF_WARNING : KWF_ERR(2)) | KWF_PREFIX |
KWF_FILELINE | KWF_TWOMSG | KWF_NOERRNO,
Tread_only, vq->name);
if (!error_ok)
unwind(LERROR);
return (0);
}
if (!(vq->flag&INTEGER)) {
/* string dest */
char *salloc = NULL;
size_t cursz;
#ifndef MKSH_SMALL
mbiPTR_U cmp_s, cmp_b, cmp_e;
#endif
if ((vq->flag&ALLOC)) {
cursz = strlen(vq->val.s) + 1;
#ifndef MKSH_SMALL
/* debugging */
cmp_s = (mbiPTR_U)(const void *)s;
cmp_b = (mbiPTR_U)(void *)vq->val.s;
cmp_e = (mbiPTR_U)(void *)(vq->val.s + cursz);
if (cmp_s >= cmp_b && cmp_s < cmp_e) {
kerrf0(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_NOERRNO,
"setstr: %s=%s: assigning to self",
vq->name, s);
}
#endif
} else
cursz = 0;
if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST)))
s = salloc = formatstr(vq, s);
if ((vq->flag&EXPORT))
exportprep(vq, s, cursz);
else {
size_t n = strlen(s) + 1;
vq->val.s = aresizeif(cursz, (vq->flag & ALLOC) ?
vq->val.s : NULL, n, vq->areap);
memcpy(vq->val.s, s, n);
vq->flag |= ALLOC;
vq->type = 0;
}
vq->flag &= ~IMPORT;
afree(salloc, ATEMP);
} else {
/* integer dest */
if (!v_evaluate(vq, s, error_ok, Ja))
return (0);
}
vq->flag |= ISSET;
if ((vq->flag&SPECIAL))
setspec(vq);
return (1);
}
/* set variable to integer */
void
setint(struct tbl *vq, mksh_ari_t n)
{
if (!(vq->flag&INTEGER)) {
vtemp->flag = (ISSET|INTEGER);
vtemp->type = 0;
vtemp->areap = ATEMP;
vtemp->val.i = n;
/* setstr can't fail here */
setstr(vq, str_val(vtemp), KSH_RETURN_ERROR);
} else
vq->val.i = n;
vq->flag |= ISSET;
if ((vq->flag&SPECIAL))
setspec(vq);
}
static int
getint(struct tbl *vp, mksh_ari_u *nump, Wahr arith)
{
if (vp->flag & SPECIAL)
getspec(vp);
/* XXX is it possible for ISSET to be set and val.s to be NULL? */
if (!(vp->flag & ISSET) || (!(vp->flag & INTEGER) && vp->val.s == NULL)) {
errno = EINVAL;
return (-1);
}
if (vp->flag & INTEGER) {
nump->i = vp->val.i;
return (vp->type);
}
return (getnum(vp->val.s + vp->type, nump, arith,
Flag(FPOSIX) && !(vp->flag & ZEROFIL)));
}
static int
getnum(const char *s, mksh_ari_u *nump, Wahr arith, Wahr psxoctal)
{
mksh_uari_t c, num = 0, base = 10;
Wahr have_base = Nee, neg = Nee;
do {
c = (unsigned char)*s++;
} while (ctype(c, C_SPACE));
switch (c) {
case '-':
neg = Ja;
/* FALLTHROUGH */
case '+':
c = (unsigned char)*s++;
break;
}
if (c == '0' && arith) {
if (isCh(s[0], 'X', 'x')) {
/* interpret as hexadecimal */
base = 16;
++s;
goto getint_c_style_base;
} else if (psxoctal && ctype(s[0], C_DIGIT)) {
/* interpret as octal (deprecated) */
base = 8;
getint_c_style_base:
have_base = Ja;
c = (unsigned char)*s++;
}
}
do {
if (c == '#') {
/* ksh-style base determination */
if (have_base || num < 1) {
errno = EINVAL;
return (-1);
}
if ((base = num) == 1) {
/* mksh-specific extension */
unsigned int wc;
ez_mbtoc(&wc, s);
nump->u = (mksh_uari_t)wc;
return (1);
} else if (base > 36)
base = 10;
num = 0;
have_base = Ja;
continue;
}
if (ctype(c, C_DIGIT))
c = ksh_numdig(c);
else if (ctype(c, C_UPPER))
c = ksh_numuc(c) + 10;
else if (ctype(c, C_LOWER))
c = ksh_numlc(c) + 10;
else {
errno = EINVAL;
return (-1);
}
if (c >= base) {
errno = EINVAL;
return (-1);
}
/* handle overflow as truncation */
num = num * base + c;
} while ((c = (unsigned char)*s++));
if (neg)
num = -num;
nump->u = num;
return (base);
}
/*
* convert variable vq to integer variable, setting its value from vp
* (vq and vp may be the same)
*/
struct tbl *
setint_v(struct tbl *vq, struct tbl *vp, Wahr arith)
{
int base;
mksh_ari_u num;
if ((base = getint(vp, &num, arith)) == -1)
return (NULL);
setint_n(vq, num.i, 0);
if (vq->type == 0)
/* default base */
vq->type = base;
return (vq);
}
/* convert variable vq to integer variable, setting its value to num */
void
setint_n(struct tbl *vq, mksh_ari_t num, int newbase)
{
if (!(vq->flag & INTEGER)) {
if (vq->flag & ALLOC)
afree(vq->val.s, vq->areap);
vq->flag &= ~(ALLOC | IMPORT);
vq->type = 0;
}
vq->val.i = num;
if (newbase != 0)
vq->type = newbase;
vq->flag |= ISSET|INTEGER;
if (vq->flag&SPECIAL)
setspec(vq);
}
static char *
formatstr(struct tbl *vp, const char *s)
{
char *p, *q;
if (vp->flag & (RJUST | LJUST)) {
int slen, nlen;
size_t psiz;
psiz = utf_mbswidth(s);
if (psiz > (size_t)INT_MAX) {
errno = EOVERFLOW;
kerrf0(KWF_ERR(0xFF) | KWF_PREFIX | KWF_FILELINE,
"string width %zu", psiz);
}
slen = (int)psiz;
if (!vp->u2.field)
/* default field width */
vp->u2.field = slen;
nlen = vp->u2.field;
p = alloc2(nlen + 1, /* MB_LEN_MAX */ 4, ATEMP);
psiz = ((size_t)nlen + 1U) * 4U;
if (vp->flag & RJUST) {
const char *qq;
int n = 0;
qq = s + strlen(s);
/* strip trailing spaces (AT&T uses qq[-1] == ' ') */
while (qq > s && ctype(qq[-1], C_SPACE)) {
--qq;
--slen;
}
if (HAS(vp->flag, ZEROFIL | INTEGER)) {
if (!s[0] || !s[1])
goto uhm_no;
if (s[1] == '#')
n = 2;
else if (s[2] == '#')
n = 3;
uhm_no:
if (vp->u2.field <= n)
n = 0;
}
if (n) {
memcpy(p, s, n);
s += n;
}
while (slen > vp->u2.field)
slen -= utf_widthadj(s, &s);
if (vp->u2.field - slen)
memset(p + n, (vp->flag & ZEROFIL) ? '0' : ' ',
vp->u2.field - slen);
slen -= n;
shf_snprintf(p + vp->u2.field - slen,
psiz - (vp->u2.field - slen),
"%.*s", slen, s);
} else {
/* strip leading spaces/zeros */
while (ctype(*s, C_SPACE))
s++;
if (vp->flag & ZEROFIL)
while (*s == '0')
s++;
shf_snprintf(p, psiz, "%-*.*s",
vp->u2.field, vp->u2.field, s);
}
} else
strdupx(p, s, ATEMP);
if (vp->flag & UCASEV_AL) {
for (q = p; *q; q++)
*q = ksh_toupper(*q);
} else if (vp->flag & LCASEV) {
for (q = p; *q; q++)
*q = ksh_tolower(*q);
}
return (p);
}
/*
* make vp->val.s be "name=value" for quick exporting.
*/
static void
exportprep(struct tbl *vp, const char *val, size_t cursz)
{
char *cp = (vp->flag & ALLOC) ? vp->val.s : NULL;
size_t namelen = strlen(vp->name);
size_t vallen = strlen(val) + 1;
vp->flag |= ALLOC;
vp->type = namelen + 1;
/* since name+val are both in memory this can go unchecked */
vp->val.s = aresizeif(cursz, cp, vp->type + vallen, vp->areap);
memmove(vp->val.s + vp->type, val == cp ? vp->val.s : val, vallen);
memcpy(vp->val.s, vp->name, namelen);
((char *)(vp->val.s))[namelen] = '=';
}
/*
* lookup variable (according to (set&LOCAL)), set its attributes
* (INTEGER, RDONLY, EXPORT, TRACE, LJUST, RJUST, ZEROFIL, LCASEV,
* UCASEV_AL), and optionally set its value if an assignment.
*/
struct tbl *
typeset(const char *var, kui set, kui clr, int field, int base)
{
return (vtypeset(NULL, var, set, clr, field, base));
}
static struct tbl *
vtypeset(int *ep, const char *var, kui set, kui clr,
int field, int base)
{
struct tbl *vp;
struct tbl *vpbase, *t;
char *tvar, tvarbuf[32];
const char *val;
size_t len;
Wahr vappend = Nee;
enum namerefflag new_refflag = SRF_NOP;
if (ep)
*ep = 0;
if ((set & (ARRAY | ASSOC)) == ASSOC) {
new_refflag = SRF_ENABLE;
set &= ~(ARRAY | ASSOC);
}
if ((clr & (ARRAY | ASSOC)) == ASSOC) {
new_refflag = SRF_DISABLE;
clr &= ~(ARRAY | ASSOC);
}
/* check for valid variable name, search for value */
val = skip_varname(var, Nee);
if (val == var) {
/* no variable name given */
return (NULL);
}
if (ord(*val) == ORD('[')) {
if (new_refflag != SRF_NOP)
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX |
KWF_FILELINE | KWF_TWOMSG | KWF_NOERRNO,
var, "reference variable can't be an array"));
len = array_ref_len(val);
if (len < 3)
return (NULL);
/*
* IMPORT is only used when the shell starts up and is
* setting up its environment. Allow only simple array
* references at this time since parameter/command
* substitution is performed on the [expression] which
* would be a major security hole.
*/
if (set & IMPORT) {
mksh_ari_u num;
len -= 2;
strnbdupx(tvar, val + 1, len, ATEMP, tvarbuf);
if (getnum(tvar, &num, Ja, Nee) == -1)
len = 0;
if (tvar != tvarbuf)
afree(tvar, ATEMP);
if (!len)
return (NULL);
len += 2;
}
val += len;
}
if (ord(val[0]) == ORD('=')) {
len = val - var;
strnbdupx(tvar, var, len, ATEMP, tvarbuf);
++val;
} else if (set & IMPORT) {
/* environment invalid variable name or no assignment */
return (NULL);
} else if (ord(val[0]) == ORD('+') && ord(val[1]) == ORD('=')) {
len = val - var;
strnbdupx(tvar, var, len, ATEMP, tvarbuf);
val += 2;
vappend = Ja;
} else if (val[0] != '\0') {
/* other invalid variable names (not from environment) */
return (NULL);
} else {
/* just varname with no value part nor equals sign */
len = strlen(var);
strnbdupx(tvar, var, len, ATEMP, tvarbuf);
val = NULL;
/* handle foo[*] => foo (whole array) mapping for R39b */
if (len > 3 && ord(tvar[len - 3]) == ORD('[') &&
ord(tvar[len - 2]) == ORD('*') &&
ord(tvar[len - 1]) == ORD(']'))
tvar[len - 3] = '\0';
}
if (new_refflag == SRF_ENABLE) {
const char *qval, *ccp;
/* bail out on 'nameref foo+=bar' */
if (vappend)
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX |
KWF_FILELINE | KWF_ONEMSG | KWF_NOERRNO,
"appending not allowed for nameref"));
/* find value if variable already exists */
if ((qval = val) == NULL) {
varsearch(e->loc, &vp, tvar, hash(tvar));
if (vp == NULL)
goto nameref_empty;
qval = str_val(vp);
}
/* check target value for being a valid variable name */
ccp = skip_varname(qval, Nee);
if (ccp == qval) {
int c;
if (!(c = (unsigned char)qval[0]))
goto nameref_empty;
else if (ctype(c, C_DIGIT) && getn(qval, &c))
goto nameref_rhs_checked;
else if (qval[1] == '\0') switch (c) {
case '$':
case '!':
case '?':
case '#':
case '-':
goto nameref_rhs_checked;
}
nameref_empty:
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX |
KWF_FILELINE | KWF_TWOMSG | KWF_NOERRNO,
var, "empty nameref target"));
}
len = (ord(*ccp) == ORD('[')) ? array_ref_len(ccp) : 0;
if (ccp[len]) {
/*
* works for cases "no array", "valid array with
* junk after it" and "invalid array"; in the
* latter case, len is also 0 and points to '['
*/
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX |
KWF_FILELINE | KWF_TWOMSG | KWF_NOERRNO,
qval, "nameref target not a valid parameter name"));
}
nameref_rhs_checked:
/* prevent nameref loops */
while (qval) {
if (!strcmp(qval, tvar))
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX |
KWF_FILELINE | KWF_TWOMSG | KWF_NOERRNO,
qval, "expression recurses on parameter"));
varsearch(e->loc, &vp, qval, hash(qval));
qval = NULL;
if (vp && ((vp->flag & (ARRAY | ASSOC)) == ASSOC))
qval = str_val(vp);
}
}
/* prevent typeset from creating a local PATH/ENV/SHELL */
if (Flag(FRESTRICTED) && (strcmp(tvar, TPATH) == 0 ||
strcmp(tvar, TENV) == 0 || strcmp(tvar, TSHELL) == 0))
merrf(NULL, (ep, KWF_ERR(1) | KWF_PREFIX | KWF_FILELINE |
KWF_TWOMSG | KWF_NOERRNO, tvar, "restricted"));
innermost_refflag = new_refflag;
vp = (set & LOCAL) ? local(tvar, isWahr(set & LOCAL_COPY)) :
global(tvar);
/* when importing environment, resolve duplicates as first-wins */
/* the EXPORT check is to permit overwriting the default $PATH */
if ((set & IMPORT) && (vp->flag & (ISSET | EXPORT)) == (ISSET | EXPORT))
return (NULL);
if (new_refflag == SRF_DISABLE && (vp->flag & (ARRAY|ASSOC)) == ASSOC)
vp->flag &= ~ASSOC;
else if (new_refflag == SRF_ENABLE) {
if (vp->flag & ARRAY) {
struct tbl *a, *tmp;
/* free up entire array */
for (a = vp->u.array; a; ) {
tmp = a;
a = a->u.array;
if (tmp->flag & ALLOC)
afree(tmp->val.s, tmp->areap);
afree(tmp, tmp->areap);
}
vp->u.array = NULL;
vp->flag &= ~ARRAY;
}
vp->flag |= ASSOC;
}
set &= ~(LOCAL|LOCAL_COPY);
vpbase = (vp->flag & ARRAY) ? arraybase(tvar) : vp;
/*
* only allow export and read-only flag to be set; AT&T ksh
* allows any attribute to be changed which means it can be
* truncated or modified (-L/-R/-Z/-i)
*/
if ((vpbase->flag & RDONLY) &&
(val || clr || (set & ~(EXPORT | RDONLY))))
merrf(NULL, (ep, KWF_ERR(2) | KWF_PREFIX | KWF_FILELINE |
KWF_TWOMSG | KWF_NOERRNO, Tread_only, tvar));
if (tvar != tvarbuf)
afree(tvar, ATEMP);
/* most calls are with set/clr == 0 */
if (set | clr) {
Wahr ok = Ja;
/*
* XXX if x[0] isn't set, there will be problems: need
* to have one copy of attributes for arrays...
*/
for (t = vpbase; t; t = t->u.array) {
Wahr fake_assign;
const char *s = NULL;
char *free_me = NULL;