be147e3426
additionally, make “HISTFILE=” the same, document the truncation and re-reading process’ further and already-known bugs; this needs work
1693 lines
37 KiB
C
1693 lines
37 KiB
C
/* $OpenBSD: var.c,v 1.40 2014/12/12 05:00:55 jsg Exp $ */
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/*-
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* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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* 2011, 2012, 2013, 2014, 2015
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* Thorsten Glaser <tg@mirbsd.org>
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*
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* Provided that these terms and disclaimer and all copyright notices
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* are retained or reproduced in an accompanying document, permission
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* is granted to deal in this work without restriction, including un-
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* limited rights to use, publicly perform, distribute, sell, modify,
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* merge, give away, or sublicence.
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*
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* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
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* the utmost extent permitted by applicable law, neither express nor
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* implied; without malicious intent or gross negligence. In no event
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* may a licensor, author or contributor be held liable for indirect,
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* direct, other damage, loss, or other issues arising in any way out
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* of dealing in the work, even if advised of the possibility of such
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* damage or existence of a defect, except proven that it results out
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* of said person's immediate fault when using the work as intended.
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*/
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#include "sh.h"
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#include "mirhash.h"
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#if defined(__OpenBSD__)
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#include <sys/sysctl.h>
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#endif
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__RCSID("$MirOS: src/bin/mksh/var.c,v 1.187 2015/03/07 20:46:31 tg Exp $");
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|
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/*-
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* Variables
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*
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* WARNING: unreadable code, needs a rewrite
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*
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* if (flag&INTEGER), val.i contains integer value, and type contains base.
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* otherwise, (val.s + type) contains string value.
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* if (flag&EXPORT), val.s contains "name=value" for E-Z exporting.
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*/
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static struct table specials;
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static uint32_t lcg_state = 5381, qh_state = 4711;
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/* may only be set by typeset() just before call to array_index_calc() */
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static enum namerefflag innermost_refflag = SRF_NOP;
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static char *formatstr(struct tbl *, const char *);
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static void exportprep(struct tbl *, const char *);
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static int special(const char *);
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static void unspecial(const char *);
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static void getspec(struct tbl *);
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static void setspec(struct tbl *);
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static void unsetspec(struct tbl *);
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static int getint(struct tbl *, mksh_ari_u *, bool);
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static const char *array_index_calc(const char *, bool *, uint32_t *);
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|
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/*
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* create a new block for function calls and simple commands
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* assume caller has allocated and set up e->loc
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*/
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void
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|
newblock(void)
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{
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struct block *l;
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static const char *empty[] = { null };
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l = alloc(sizeof(struct block), ATEMP);
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l->flags = 0;
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/* TODO: could use e->area (l->area => l->areap) */
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ainit(&l->area);
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if (!e->loc) {
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l->argc = 0;
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l->argv = empty;
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} else {
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l->argc = e->loc->argc;
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l->argv = e->loc->argv;
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}
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l->exit = l->error = NULL;
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ktinit(&l->area, &l->vars, 0);
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ktinit(&l->area, &l->funs, 0);
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l->next = e->loc;
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e->loc = l;
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}
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|
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/*
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* pop a block handling special variables
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*/
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void
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popblock(void)
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{
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ssize_t i;
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struct block *l = e->loc;
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struct tbl *vp, **vpp = l->vars.tbls, *vq;
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|
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/* pop block */
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e->loc = l->next;
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i = 1 << (l->vars.tshift);
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while (--i >= 0)
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if ((vp = *vpp++) != NULL && (vp->flag&SPECIAL)) {
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if ((vq = global(vp->name))->flag & ISSET)
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setspec(vq);
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else
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unsetspec(vq);
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}
|
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if (l->flags & BF_DOGETOPTS)
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user_opt = l->getopts_state;
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afreeall(&l->area);
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afree(l, ATEMP);
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}
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|
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/* called by main() to initialise variable data structures */
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#define VARSPEC_DEFNS
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#include "var_spec.h"
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enum var_specs {
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#define VARSPEC_ENUMS
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#include "var_spec.h"
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V_MAX
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};
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|
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/* this is biased with -1 relative to VARSPEC_ENUMS */
|
|
static const char * const initvar_names[] = {
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#define VARSPEC_ITEMS
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#include "var_spec.h"
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|
};
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|
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void
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initvar(void)
|
|
{
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int i = 0;
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struct tbl *tp;
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ktinit(APERM, &specials,
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/* currently 14 specials: 75% of 32 = 2^5 */
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5);
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while (i < V_MAX - 1) {
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tp = ktenter(&specials, initvar_names[i],
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hash(initvar_names[i]));
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tp->flag = DEFINED|ISSET;
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tp->type = ++i;
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}
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}
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/* common code for several functions below and c_typeset() */
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struct block *
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varsearch(struct block *l, struct tbl **vpp, const char *vn, uint32_t h)
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{
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register struct tbl *vp;
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if (l) {
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varsearch_loop:
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if ((vp = ktsearch(&l->vars, vn, h)) != NULL)
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goto varsearch_out;
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if (l->next != NULL) {
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l = l->next;
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goto varsearch_loop;
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}
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}
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vp = NULL;
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varsearch_out:
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*vpp = vp;
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return (l);
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}
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/*
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* Used to calculate an array index for global()/local(). Sets *arrayp
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* to true if this is an array, sets *valp to the array index, returns
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* the basename of the array. May only be called from global()/local()
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* and must be their first callee.
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*/
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static const char *
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array_index_calc(const char *n, bool *arrayp, uint32_t *valp)
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{
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const char *p;
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size_t len;
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char *ap = NULL;
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*arrayp = false;
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redo_from_ref:
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p = skip_varname(n, false);
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if (innermost_refflag == SRF_NOP && (p != n) && ksh_isalphx(n[0])) {
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struct tbl *vp;
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char *vn;
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strndupx(vn, n, p - n, ATEMP);
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/* check if this is a reference */
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varsearch(e->loc, &vp, vn, hash(vn));
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afree(vn, ATEMP);
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if (vp && (vp->flag & (DEFINED | ASSOC | ARRAY)) ==
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(DEFINED | ASSOC)) {
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char *cp;
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/* gotcha! */
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cp = shf_smprintf("%s%s", str_val(vp), p);
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afree(ap, ATEMP);
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n = ap = cp;
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goto redo_from_ref;
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}
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}
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innermost_refflag = SRF_NOP;
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if (p != n && *p == '[' && (len = array_ref_len(p))) {
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char *sub, *tmp;
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mksh_ari_t rval;
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/* calculate the value of the subscript */
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*arrayp = true;
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strndupx(tmp, p + 1, len - 2, ATEMP);
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sub = substitute(tmp, 0);
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afree(tmp, ATEMP);
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strndupx(n, n, p - n, ATEMP);
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evaluate(sub, &rval, KSH_UNWIND_ERROR, true);
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*valp = (uint32_t)rval;
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afree(sub, ATEMP);
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}
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return (n);
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}
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|
|
/*
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|
* Search for variable, if not found create globally.
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|
*/
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|
struct tbl *
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global(const char *n)
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{
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|
struct block *l = e->loc;
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struct tbl *vp;
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int c;
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|
bool array;
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uint32_t h, val;
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/*
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|
* check to see if this is an array;
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* dereference namerefs; must come first
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*/
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n = array_index_calc(n, &array, &val);
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h = hash(n);
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c = (unsigned char)n[0];
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if (!ksh_isalphx(c)) {
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if (array)
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errorf("bad substitution");
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vp = &vtemp;
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vp->flag = DEFINED;
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vp->type = 0;
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vp->areap = ATEMP;
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*vp->name = c;
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if (ksh_isdigit(c)) {
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if (getn(n, &c) && (c <= l->argc))
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/* setstr can't fail here */
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setstr(vp, l->argv[c], KSH_RETURN_ERROR);
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vp->flag |= RDONLY;
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return (vp);
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}
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vp->flag |= RDONLY;
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if (n[1] != '\0')
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|
return (vp);
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|
vp->flag |= ISSET|INTEGER;
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switch (c) {
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|
case '$':
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vp->val.i = kshpid;
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break;
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|
case '!':
|
|
/* if no job, expand to nothing */
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|
if ((vp->val.i = j_async()) == 0)
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vp->flag &= ~(ISSET|INTEGER);
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|
break;
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|
case '?':
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vp->val.i = exstat & 0xFF;
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break;
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|
case '#':
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|
vp->val.i = l->argc;
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break;
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|
case '-':
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|
vp->flag &= ~INTEGER;
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vp->val.s = getoptions();
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break;
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default:
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|
vp->flag &= ~(ISSET|INTEGER);
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}
|
|
return (vp);
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|
}
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|
l = varsearch(e->loc, &vp, n, h);
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|
if (vp != NULL)
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|
return (array ? arraysearch(vp, val) : vp);
|
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vp = ktenter(&l->vars, n, h);
|
|
if (array)
|
|
vp = arraysearch(vp, val);
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vp->flag |= DEFINED;
|
|
if (special(n))
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vp->flag |= SPECIAL;
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return (vp);
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}
|
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|
|
/*
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|
* Search for local variable, if not found create locally.
|
|
*/
|
|
struct tbl *
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|
local(const char *n, bool copy)
|
|
{
|
|
struct block *l = e->loc;
|
|
struct tbl *vp;
|
|
bool array;
|
|
uint32_t h, val;
|
|
|
|
/*
|
|
* check to see if this is an array;
|
|
* dereference namerefs; must come first
|
|
*/
|
|
n = array_index_calc(n, &array, &val);
|
|
h = hash(n);
|
|
if (!ksh_isalphx(*n)) {
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|
vp = &vtemp;
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|
vp->flag = DEFINED|RDONLY;
|
|
vp->type = 0;
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|
vp->areap = ATEMP;
|
|
return (vp);
|
|
}
|
|
vp = ktenter(&l->vars, n, h);
|
|
if (copy && !(vp->flag & DEFINED)) {
|
|
struct tbl *vq;
|
|
|
|
varsearch(l->next, &vq, n, h);
|
|
if (vq != NULL) {
|
|
vp->flag |= vq->flag &
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(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, val);
|
|
vp->flag |= DEFINED;
|
|
if (special(n))
|
|
vp->flag |= SPECIAL;
|
|
return (vp);
|
|
}
|
|
|
|
/* 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 && n == 0)
|
|
base = 2;
|
|
if (base == 1) {
|
|
size_t sz = 1;
|
|
|
|
*(s = strbuf) = '1';
|
|
s[1] = '#';
|
|
if (!UTFMODE || ((n & 0xFF80) == 0xEF80))
|
|
/* OPTU-16 -> raw octet */
|
|
s[2] = n & 0xFF;
|
|
else
|
|
sz = utf_wctomb(s + 2, n);
|
|
s[2 + sz] = '\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)
|
|
{
|
|
char *salloc = NULL;
|
|
bool no_ro_check = tobool(error_ok & 0x4);
|
|
|
|
error_ok &= ~0x4;
|
|
if ((vq->flag & RDONLY) && !no_ro_check) {
|
|
warningf(true, "read-only: %s", vq->name);
|
|
if (!error_ok)
|
|
errorfxz(2);
|
|
return (0);
|
|
}
|
|
if (!(vq->flag&INTEGER)) {
|
|
/* string dest */
|
|
if ((vq->flag&ALLOC)) {
|
|
#ifndef MKSH_SMALL
|
|
/* debugging */
|
|
if (s >= vq->val.s &&
|
|
s <= vq->val.s + strlen(vq->val.s)) {
|
|
internal_errorf(
|
|
"setstr: %s=%s: assigning to self",
|
|
vq->name, s);
|
|
}
|
|
#endif
|
|
afree(vq->val.s, vq->areap);
|
|
}
|
|
vq->flag &= ~(ISSET|ALLOC);
|
|
vq->type = 0;
|
|
if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST)))
|
|
s = salloc = formatstr(vq, s);
|
|
if ((vq->flag&EXPORT))
|
|
exportprep(vq, s);
|
|
else {
|
|
strdupx(vq->val.s, s, vq->areap);
|
|
vq->flag |= ALLOC;
|
|
}
|
|
} else {
|
|
/* integer dest */
|
|
if (!v_evaluate(vq, s, error_ok, true))
|
|
return (0);
|
|
}
|
|
vq->flag |= ISSET;
|
|
if ((vq->flag&SPECIAL))
|
|
setspec(vq);
|
|
afree(salloc, ATEMP);
|
|
return (1);
|
|
}
|
|
|
|
/* set variable to integer */
|
|
void
|
|
setint(struct tbl *vq, mksh_ari_t n)
|
|
{
|
|
if (!(vq->flag&INTEGER)) {
|
|
struct tbl *vp = &vtemp;
|
|
vp->flag = (ISSET|INTEGER);
|
|
vp->type = 0;
|
|
vp->areap = ATEMP;
|
|
vp->val.i = n;
|
|
/* setstr can't fail here */
|
|
setstr(vq, str_val(vp), 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, bool arith)
|
|
{
|
|
mksh_uari_t c, num, base;
|
|
const char *s;
|
|
bool have_base = false, neg = false;
|
|
|
|
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))
|
|
return (-1);
|
|
if (vp->flag&INTEGER) {
|
|
nump->i = vp->val.i;
|
|
return (vp->type);
|
|
}
|
|
s = vp->val.s + vp->type;
|
|
base = 10;
|
|
num = 0;
|
|
if (arith && s[0] == '0' && (s[1] | 0x20) == 'x') {
|
|
s += 2;
|
|
base = 16;
|
|
have_base = true;
|
|
}
|
|
if (Flag(FPOSIX) && arith && s[0] == '0' && ksh_isdigit(s[1]) &&
|
|
!(vp->flag & ZEROFIL)) {
|
|
/* interpret as octal (deprecated) */
|
|
base = 8;
|
|
have_base = true;
|
|
}
|
|
while ((c = (unsigned char)*s++)) {
|
|
if (c == '-') {
|
|
neg = true;
|
|
continue;
|
|
} else if (c == '#') {
|
|
if (have_base || num < 1)
|
|
return (-1);
|
|
if ((base = num) == 1) {
|
|
unsigned int wc;
|
|
|
|
if (!UTFMODE)
|
|
wc = *(const unsigned char *)s;
|
|
else if (utf_mbtowc(&wc, s) == (size_t)-1)
|
|
/* OPTU-8 -> OPTU-16 */
|
|
/*
|
|
* (with a twist: 1#\uEF80 converts
|
|
* the same as 1#\x80 does, thus is
|
|
* not round-tripping correctly XXX)
|
|
*/
|
|
wc = 0xEF00 + *(const unsigned char *)s;
|
|
nump->u = (mksh_uari_t)wc;
|
|
return (1);
|
|
} else if (base > 36)
|
|
base = 10;
|
|
num = 0;
|
|
have_base = true;
|
|
continue;
|
|
} else if (ksh_isdigit(c))
|
|
c -= '0';
|
|
else if (ksh_islower(c))
|
|
c -= 'a' - 10;
|
|
else if (ksh_isupper(c))
|
|
c -= 'A' - 10;
|
|
else
|
|
return (-1);
|
|
if (c >= base)
|
|
return (-1);
|
|
num = num * base + c;
|
|
}
|
|
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, bool 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) && (vq->flag & ALLOC)) {
|
|
vq->flag &= ~ALLOC;
|
|
vq->type = 0;
|
|
afree(vq->val.s, vq->areap);
|
|
}
|
|
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)
|
|
{
|
|
int olen, nlen;
|
|
char *p, *q;
|
|
size_t psiz;
|
|
|
|
olen = (int)utf_mbswidth(s);
|
|
|
|
if (vp->flag & (RJUST|LJUST)) {
|
|
if (!vp->u2.field)
|
|
/* default field width */
|
|
vp->u2.field = olen;
|
|
nlen = vp->u2.field;
|
|
} else
|
|
nlen = olen;
|
|
|
|
p = alloc((psiz = nlen * /* MB_LEN_MAX */ 3 + 1), ATEMP);
|
|
if (vp->flag & (RJUST|LJUST)) {
|
|
int slen = olen, i = 0;
|
|
|
|
if (vp->flag & RJUST) {
|
|
const char *qq = s;
|
|
int n = 0;
|
|
|
|
while (i < slen)
|
|
i += utf_widthadj(qq, &qq);
|
|
/* strip trailing spaces (AT&T uses qq[-1] == ' ') */
|
|
while (qq > s && ksh_isspace(qq[-1])) {
|
|
--qq;
|
|
--slen;
|
|
}
|
|
if (vp->flag & ZEROFIL && vp->flag & 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 (ksh_isspace(*s))
|
|
s++;
|
|
if (vp->flag & ZEROFIL)
|
|
while (*s == '0')
|
|
s++;
|
|
shf_snprintf(p, nlen + 1, "%-*.*s",
|
|
vp->u2.field, vp->u2.field, s);
|
|
}
|
|
} else
|
|
memcpy(p, s, strlen(s) + 1);
|
|
|
|
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)
|
|
{
|
|
char *xp;
|
|
char *op = (vp->flag&ALLOC) ? vp->val.s : NULL;
|
|
size_t namelen, vallen;
|
|
|
|
namelen = strlen(vp->name);
|
|
vallen = strlen(val) + 1;
|
|
|
|
vp->flag |= ALLOC;
|
|
/* since name+val are both in memory this can go unchecked */
|
|
xp = alloc(namelen + 1 + vallen, vp->areap);
|
|
memcpy(vp->val.s = xp, vp->name, namelen);
|
|
xp += namelen;
|
|
*xp++ = '=';
|
|
/* offset to value */
|
|
vp->type = xp - vp->val.s;
|
|
memcpy(xp, val, vallen);
|
|
if (op != NULL)
|
|
afree(op, vp->areap);
|
|
}
|
|
|
|
/*
|
|
* 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, uint32_t set, uint32_t clr, int field, int base)
|
|
{
|
|
struct tbl *vp;
|
|
struct tbl *vpbase, *t;
|
|
char *tvar;
|
|
const char *val;
|
|
size_t len;
|
|
bool vappend = false;
|
|
enum namerefflag new_refflag = SRF_NOP;
|
|
|
|
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, false);
|
|
if (val == var) {
|
|
/* no variable name given */
|
|
return (NULL);
|
|
}
|
|
if (*val == '[') {
|
|
if (new_refflag != SRF_NOP)
|
|
errorf("%s: %s", var,
|
|
"reference variable can't be an array");
|
|
len = array_ref_len(val);
|
|
if (len == 0)
|
|
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) {
|
|
size_t i;
|
|
|
|
for (i = 1; i < len - 1; i++)
|
|
if (!ksh_isdigit(val[i]))
|
|
return (NULL);
|
|
}
|
|
val += len;
|
|
}
|
|
if (val[0] == '=') {
|
|
strndupx(tvar, var, val - var, ATEMP);
|
|
++val;
|
|
} else if (set & IMPORT) {
|
|
/* environment invalid variable name or no assignment */
|
|
return (NULL);
|
|
} else if (val[0] == '+' && val[1] == '=') {
|
|
strndupx(tvar, var, val - var, ATEMP);
|
|
val += 2;
|
|
vappend = true;
|
|
} else if (val[0] != '\0') {
|
|
/* other invalid variable names (not from environment) */
|
|
return (NULL);
|
|
} else {
|
|
/* just varname with no value part nor equals sign */
|
|
strdupx(tvar, var, ATEMP);
|
|
val = NULL;
|
|
/* handle foo[*] => foo (whole array) mapping for R39b */
|
|
len = strlen(tvar);
|
|
if (len > 3 && tvar[len - 3] == '[' && tvar[len - 2] == '*' &&
|
|
tvar[len - 1] == ']')
|
|
tvar[len - 3] = '\0';
|
|
}
|
|
|
|
if (new_refflag == SRF_ENABLE) {
|
|
const char *qval, *ccp;
|
|
|
|
/* bail out on 'nameref foo+=bar' */
|
|
if (vappend)
|
|
errorf("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, false);
|
|
if (ccp == qval) {
|
|
if (ksh_isdigit(qval[0])) {
|
|
int c;
|
|
|
|
if (getn(qval, &c))
|
|
goto nameref_rhs_checked;
|
|
} else if (qval[1] == '\0') switch (qval[0]) {
|
|
case '$':
|
|
case '!':
|
|
case '?':
|
|
case '#':
|
|
case '-':
|
|
goto nameref_rhs_checked;
|
|
}
|
|
nameref_empty:
|
|
errorf("%s: %s", var, "empty nameref target");
|
|
}
|
|
len = (*ccp == '[') ? 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 '['
|
|
*/
|
|
errorf("%s: %s", qval,
|
|
"nameref target not a valid parameter name");
|
|
}
|
|
nameref_rhs_checked:
|
|
/* prevent nameref loops */
|
|
while (qval) {
|
|
if (!strcmp(qval, tvar))
|
|
errorf("%s: %s", 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, "PATH") == 0 ||
|
|
strcmp(tvar, "ENV") == 0 || strcmp(tvar, "SHELL") == 0))
|
|
errorf("%s: %s", tvar, "restricted");
|
|
|
|
innermost_refflag = new_refflag;
|
|
vp = (set & LOCAL) ? local(tvar, tobool(set & LOCAL_COPY)) :
|
|
global(tvar);
|
|
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) ? global(arrayname(tvar)) : vp;
|
|
|
|
/*
|
|
* only allow export 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)))
|
|
/* XXX check calls - is error here ok by POSIX? */
|
|
errorfx(2, "read-only: %s", tvar);
|
|
afree(tvar, ATEMP);
|
|
|
|
/* most calls are with set/clr == 0 */
|
|
if (set | clr) {
|
|
bool ok = true;
|
|
|
|
/*
|
|
* 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) {
|
|
bool fake_assign;
|
|
char *s = NULL;
|
|
char *free_me = NULL;
|
|
|
|
fake_assign = (t->flag & ISSET) && (!val || t != vp) &&
|
|
((set & (UCASEV_AL|LCASEV|LJUST|RJUST|ZEROFIL)) ||
|
|
((t->flag & INTEGER) && (clr & INTEGER)) ||
|
|
(!(t->flag & INTEGER) && (set & INTEGER)));
|
|
if (fake_assign) {
|
|
if (t->flag & INTEGER) {
|
|
s = str_val(t);
|
|
free_me = NULL;
|
|
} else {
|
|
s = t->val.s + t->type;
|
|
free_me = (t->flag & ALLOC) ? t->val.s :
|
|
NULL;
|
|
}
|
|
t->flag &= ~ALLOC;
|
|
}
|
|
if (!(t->flag & INTEGER) && (set & INTEGER)) {
|
|
t->type = 0;
|
|
t->flag &= ~ALLOC;
|
|
}
|
|
t->flag = (t->flag | set) & ~clr;
|
|
/*
|
|
* Don't change base if assignment is to be
|
|
* done, in case assignment fails.
|
|
*/
|
|
if ((set & INTEGER) && base > 0 && (!val || t != vp))
|
|
t->type = base;
|
|
if (set & (LJUST|RJUST|ZEROFIL))
|
|
t->u2.field = field;
|
|
if (fake_assign) {
|
|
if (!setstr(t, s, KSH_RETURN_ERROR)) {
|
|
/*
|
|
* Somewhat arbitrary action
|
|
* here: zap contents of
|
|
* variable, but keep the flag
|
|
* settings.
|
|
*/
|
|
ok = false;
|
|
if (t->flag & INTEGER)
|
|
t->flag &= ~ISSET;
|
|
else {
|
|
if (t->flag & ALLOC)
|
|
afree(t->val.s, t->areap);
|
|
t->flag &= ~(ISSET|ALLOC);
|
|
t->type = 0;
|
|
}
|
|
}
|
|
if (free_me)
|
|
afree(free_me, t->areap);
|
|
}
|
|
}
|
|
if (!ok)
|
|
errorfz();
|
|
}
|
|
|
|
if (val != NULL) {
|
|
char *tval;
|
|
|
|
if (vappend) {
|
|
tval = shf_smprintf("%s%s", str_val(vp), val);
|
|
val = tval;
|
|
} else
|
|
tval = NULL;
|
|
|
|
if (vp->flag&INTEGER) {
|
|
/* do not zero base before assignment */
|
|
setstr(vp, val, KSH_UNWIND_ERROR | 0x4);
|
|
/* done after assignment to override default */
|
|
if (base > 0)
|
|
vp->type = base;
|
|
} else
|
|
/* setstr can't fail (readonly check already done) */
|
|
setstr(vp, val, KSH_RETURN_ERROR | 0x4);
|
|
|
|
if (tval != NULL)
|
|
afree(tval, ATEMP);
|
|
}
|
|
|
|
/* only x[0] is ever exported, so use vpbase */
|
|
if ((vpbase->flag&EXPORT) && !(vpbase->flag&INTEGER) &&
|
|
vpbase->type == 0)
|
|
exportprep(vpbase, (vpbase->flag&ISSET) ? vpbase->val.s : null);
|
|
|
|
return (vp);
|
|
}
|
|
|
|
/**
|
|
* Unset a variable. The flags can be:
|
|
* |1 = tear down entire array
|
|
* |2 = keep attributes, only unset content
|
|
*/
|
|
void
|
|
unset(struct tbl *vp, int flags)
|
|
{
|
|
if (vp->flag & ALLOC)
|
|
afree(vp->val.s, vp->areap);
|
|
if ((vp->flag & ARRAY) && (flags & 1)) {
|
|
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;
|
|
}
|
|
if (flags & 2) {
|
|
vp->flag &= ~(ALLOC|ISSET);
|
|
return;
|
|
}
|
|
/* if foo[0] is being unset, the remainder of the array is kept... */
|
|
vp->flag &= SPECIAL | ((flags & 1) ? 0 : ARRAY|DEFINED);
|
|
if (vp->flag & SPECIAL)
|
|
/* responsible for 'unspecial'ing var */
|
|
unsetspec(vp);
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the first char past a legal variable name
|
|
* (returns the argument if there is no legal name, returns a pointer to
|
|
* the terminating NUL if whole string is legal).
|
|
*/
|
|
const char *
|
|
skip_varname(const char *s, bool aok)
|
|
{
|
|
size_t alen;
|
|
|
|
if (s && ksh_isalphx(*s)) {
|
|
while (*++s && ksh_isalnux(*s))
|
|
;
|
|
if (aok && *s == '[' && (alen = array_ref_len(s)))
|
|
s += alen;
|
|
}
|
|
return (s);
|
|
}
|
|
|
|
/* Return a pointer to the first character past any legal variable name */
|
|
const char *
|
|
skip_wdvarname(const char *s,
|
|
/* skip array de-reference? */
|
|
bool aok)
|
|
{
|
|
if (s[0] == CHAR && ksh_isalphx(s[1])) {
|
|
do {
|
|
s += 2;
|
|
} while (s[0] == CHAR && ksh_isalnux(s[1]));
|
|
if (aok && s[0] == CHAR && s[1] == '[') {
|
|
/* skip possible array de-reference */
|
|
const char *p = s;
|
|
char c;
|
|
int depth = 0;
|
|
|
|
while (/* CONSTCOND */ 1) {
|
|
if (p[0] != CHAR)
|
|
break;
|
|
c = p[1];
|
|
p += 2;
|
|
if (c == '[')
|
|
depth++;
|
|
else if (c == ']' && --depth == 0) {
|
|
s = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (s);
|
|
}
|
|
|
|
/* Check if coded string s is a variable name */
|
|
int
|
|
is_wdvarname(const char *s, bool aok)
|
|
{
|
|
const char *p = skip_wdvarname(s, aok);
|
|
|
|
return (p != s && p[0] == EOS);
|
|
}
|
|
|
|
/* Check if coded string s is a variable assignment */
|
|
int
|
|
is_wdvarassign(const char *s)
|
|
{
|
|
const char *p = skip_wdvarname(s, true);
|
|
|
|
return (p != s && p[0] == CHAR &&
|
|
(p[1] == '=' || (p[1] == '+' && p[2] == CHAR && p[3] == '=')));
|
|
}
|
|
|
|
/*
|
|
* Make the exported environment from the exported names in the dictionary.
|
|
*/
|
|
char **
|
|
makenv(void)
|
|
{
|
|
ssize_t i;
|
|
struct block *l;
|
|
XPtrV denv;
|
|
struct tbl *vp, **vpp;
|
|
|
|
XPinit(denv, 64);
|
|
for (l = e->loc; l != NULL; l = l->next) {
|
|
vpp = l->vars.tbls;
|
|
i = 1 << (l->vars.tshift);
|
|
while (--i >= 0)
|
|
if ((vp = *vpp++) != NULL &&
|
|
(vp->flag&(ISSET|EXPORT)) == (ISSET|EXPORT)) {
|
|
struct block *l2;
|
|
struct tbl *vp2;
|
|
uint32_t h = hash(vp->name);
|
|
|
|
/* unexport any redefined instances */
|
|
for (l2 = l->next; l2 != NULL; l2 = l2->next) {
|
|
vp2 = ktsearch(&l2->vars, vp->name, h);
|
|
if (vp2 != NULL)
|
|
vp2->flag &= ~EXPORT;
|
|
}
|
|
if ((vp->flag&INTEGER)) {
|
|
/* integer to string */
|
|
char *val;
|
|
val = str_val(vp);
|
|
vp->flag &= ~(INTEGER|RDONLY|SPECIAL);
|
|
/* setstr can't fail here */
|
|
setstr(vp, val, KSH_RETURN_ERROR);
|
|
}
|
|
XPput(denv, vp->val.s);
|
|
}
|
|
if (l->flags & BF_STOPENV)
|
|
break;
|
|
}
|
|
XPput(denv, NULL);
|
|
return ((char **)XPclose(denv));
|
|
}
|
|
|
|
/*
|
|
* handle special variables with side effects - PATH, SECONDS.
|
|
*/
|
|
|
|
/* Test if name is a special parameter */
|
|
static int
|
|
special(const char *name)
|
|
{
|
|
struct tbl *tp;
|
|
|
|
tp = ktsearch(&specials, name, hash(name));
|
|
return (tp && (tp->flag & ISSET) ? tp->type : V_NONE);
|
|
}
|
|
|
|
/* Make a variable non-special */
|
|
static void
|
|
unspecial(const char *name)
|
|
{
|
|
struct tbl *tp;
|
|
|
|
tp = ktsearch(&specials, name, hash(name));
|
|
if (tp)
|
|
ktdelete(tp);
|
|
}
|
|
|
|
static time_t seconds; /* time SECONDS last set */
|
|
static int user_lineno; /* what user set $LINENO to */
|
|
|
|
static void
|
|
getspec(struct tbl *vp)
|
|
{
|
|
mksh_ari_u num;
|
|
int st;
|
|
struct timeval tv;
|
|
|
|
switch ((st = special(vp->name))) {
|
|
case V_COLUMNS:
|
|
case V_LINES:
|
|
/*
|
|
* Do NOT export COLUMNS/LINES. Many applications
|
|
* check COLUMNS/LINES before checking ws.ws_col/row,
|
|
* so if the app is started with C/L in the environ
|
|
* and the window is then resized, the app won't
|
|
* see the change cause the environ doesn't change.
|
|
*/
|
|
if (got_winch)
|
|
change_winsz();
|
|
break;
|
|
}
|
|
switch (st) {
|
|
case V_BASHPID:
|
|
num.u = (mksh_uari_t)procpid;
|
|
break;
|
|
case V_COLUMNS:
|
|
num.i = x_cols;
|
|
break;
|
|
case V_HISTSIZE:
|
|
num.i = histsize;
|
|
break;
|
|
case V_LINENO:
|
|
num.i = current_lineno + user_lineno;
|
|
break;
|
|
case V_LINES:
|
|
num.i = x_lins;
|
|
break;
|
|
case V_EPOCHREALTIME: {
|
|
/* 10(%u) + 1(.) + 6 + NUL */
|
|
char buf[18];
|
|
|
|
vp->flag &= ~SPECIAL;
|
|
mksh_TIME(tv);
|
|
shf_snprintf(buf, sizeof(buf), "%u.%06u",
|
|
(unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
|
|
setstr(vp, buf, KSH_RETURN_ERROR | 0x4);
|
|
vp->flag |= SPECIAL;
|
|
return;
|
|
}
|
|
case V_OPTIND:
|
|
num.i = user_opt.uoptind;
|
|
break;
|
|
case V_RANDOM:
|
|
num.i = rndget();
|
|
break;
|
|
case V_SECONDS:
|
|
/*
|
|
* On start up the value of SECONDS is used before
|
|
* it has been set - don't do anything in this case
|
|
* (see initcoms[] in main.c).
|
|
*/
|
|
if (vp->flag & ISSET) {
|
|
mksh_TIME(tv);
|
|
num.i = tv.tv_sec - seconds;
|
|
} else
|
|
return;
|
|
break;
|
|
default:
|
|
/* do nothing, do not touch vp at all */
|
|
return;
|
|
}
|
|
vp->flag &= ~SPECIAL;
|
|
setint_n(vp, num.i, 0);
|
|
vp->flag |= SPECIAL;
|
|
}
|
|
|
|
static void
|
|
setspec(struct tbl *vp)
|
|
{
|
|
mksh_ari_u num;
|
|
char *s;
|
|
int st;
|
|
|
|
switch ((st = special(vp->name))) {
|
|
#if HAVE_PERSISTENT_HISTORY
|
|
case V_HISTFILE:
|
|
sethistfile(str_val(vp));
|
|
return;
|
|
#endif
|
|
case V_IFS:
|
|
setctypes(s = str_val(vp), C_IFS);
|
|
ifs0 = *s;
|
|
return;
|
|
case V_PATH:
|
|
if (path)
|
|
afree(path, APERM);
|
|
s = str_val(vp);
|
|
strdupx(path, s, APERM);
|
|
/* clear tracked aliases */
|
|
flushcom(true);
|
|
return;
|
|
case V_TMPDIR:
|
|
if (tmpdir) {
|
|
afree(tmpdir, APERM);
|
|
tmpdir = NULL;
|
|
}
|
|
/*
|
|
* Use tmpdir iff it is an absolute path, is writable
|
|
* and searchable and is a directory...
|
|
*/
|
|
{
|
|
struct stat statb;
|
|
|
|
s = str_val(vp);
|
|
/* LINTED use of access */
|
|
if (s[0] == '/' && access(s, W_OK|X_OK) == 0 &&
|
|
stat(s, &statb) == 0 && S_ISDIR(statb.st_mode))
|
|
strdupx(tmpdir, s, APERM);
|
|
}
|
|
return;
|
|
/* common sub-cases */
|
|
case V_COLUMNS:
|
|
case V_LINES:
|
|
if (vp->flag & IMPORT) {
|
|
/* do not touch */
|
|
unspecial(vp->name);
|
|
vp->flag &= ~SPECIAL;
|
|
return;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case V_HISTSIZE:
|
|
case V_LINENO:
|
|
case V_OPTIND:
|
|
case V_RANDOM:
|
|
case V_SECONDS:
|
|
case V_TMOUT:
|
|
vp->flag &= ~SPECIAL;
|
|
if (getint(vp, &num, false) == -1) {
|
|
s = str_val(vp);
|
|
if (st != V_RANDOM)
|
|
errorf("%s: %s: %s", vp->name, "bad number", s);
|
|
num.u = hash(s);
|
|
}
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
default:
|
|
/* do nothing, do not touch vp at all */
|
|
return;
|
|
}
|
|
|
|
/* process the singular parts of the common cases */
|
|
|
|
switch (st) {
|
|
case V_COLUMNS:
|
|
if (num.i >= MIN_COLS)
|
|
x_cols = num.i;
|
|
break;
|
|
case V_HISTSIZE:
|
|
sethistsize(num.i);
|
|
break;
|
|
case V_LINENO:
|
|
/* The -1 is because line numbering starts at 1. */
|
|
user_lineno = num.u - current_lineno - 1;
|
|
break;
|
|
case V_LINES:
|
|
if (num.i >= MIN_LINS)
|
|
x_lins = num.i;
|
|
break;
|
|
case V_OPTIND:
|
|
getopts_reset((int)num.i);
|
|
break;
|
|
case V_RANDOM:
|
|
/*
|
|
* mksh R39d+ no longer has the traditional repeatability
|
|
* of $RANDOM sequences, but always retains state
|
|
*/
|
|
rndset((unsigned long)num.u);
|
|
break;
|
|
case V_SECONDS:
|
|
{
|
|
struct timeval tv;
|
|
|
|
mksh_TIME(tv);
|
|
seconds = tv.tv_sec - num.i;
|
|
}
|
|
break;
|
|
case V_TMOUT:
|
|
ksh_tmout = num.i >= 0 ? num.i : 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
unsetspec(struct tbl *vp)
|
|
{
|
|
/*
|
|
* AT&T ksh man page says OPTIND, OPTARG and _ lose special
|
|
* meaning, but OPTARG does not (still set by getopts) and _ is
|
|
* also still set in various places. Don't know what AT&T does
|
|
* for HISTSIZE, HISTFILE. Unsetting these in AT&T ksh does not
|
|
* loose the 'specialness': IFS, COLUMNS, PATH, TMPDIR
|
|
*/
|
|
|
|
switch (special(vp->name)) {
|
|
#if HAVE_PERSISTENT_HISTORY
|
|
case V_HISTFILE:
|
|
sethistfile(NULL);
|
|
return;
|
|
#endif
|
|
case V_IFS:
|
|
setctypes(TC_IFSWS, C_IFS);
|
|
ifs0 = ' ';
|
|
break;
|
|
case V_PATH:
|
|
if (path)
|
|
afree(path, APERM);
|
|
strdupx(path, def_path, APERM);
|
|
/* clear tracked aliases */
|
|
flushcom(true);
|
|
break;
|
|
case V_TMPDIR:
|
|
/* should not become unspecial */
|
|
if (tmpdir) {
|
|
afree(tmpdir, APERM);
|
|
tmpdir = NULL;
|
|
}
|
|
break;
|
|
case V_LINENO:
|
|
case V_RANDOM:
|
|
case V_SECONDS:
|
|
case V_TMOUT:
|
|
/* AT&T ksh leaves previous value in place */
|
|
unspecial(vp->name);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search for (and possibly create) a table entry starting with
|
|
* vp, indexed by val.
|
|
*/
|
|
struct tbl *
|
|
arraysearch(struct tbl *vp, uint32_t val)
|
|
{
|
|
struct tbl *prev, *curr, *news;
|
|
size_t len;
|
|
|
|
vp->flag = (vp->flag | (ARRAY | DEFINED)) & ~ASSOC;
|
|
/* the table entry is always [0] */
|
|
if (val == 0)
|
|
return (vp);
|
|
prev = vp;
|
|
curr = vp->u.array;
|
|
while (curr && curr->ua.index < val) {
|
|
prev = curr;
|
|
curr = curr->u.array;
|
|
}
|
|
if (curr && curr->ua.index == val) {
|
|
if (curr->flag&ISSET)
|
|
return (curr);
|
|
news = curr;
|
|
} else
|
|
news = NULL;
|
|
if (!news) {
|
|
len = strlen(vp->name);
|
|
checkoktoadd(len, 1 + offsetof(struct tbl, name[0]));
|
|
news = alloc(offsetof(struct tbl, name[0]) + ++len, vp->areap);
|
|
memcpy(news->name, vp->name, len);
|
|
}
|
|
news->flag = (vp->flag & ~(ALLOC|DEFINED|ISSET|SPECIAL)) | AINDEX;
|
|
news->type = vp->type;
|
|
news->areap = vp->areap;
|
|
news->u2.field = vp->u2.field;
|
|
news->ua.index = val;
|
|
|
|
if (curr != news) {
|
|
/* not reusing old array entry */
|
|
prev->u.array = news;
|
|
news->u.array = curr;
|
|
}
|
|
return (news);
|
|
}
|
|
|
|
/*
|
|
* Return the length of an array reference (eg, [1+2]) - cp is assumed
|
|
* to point to the open bracket. Returns 0 if there is no matching
|
|
* closing bracket.
|
|
*
|
|
* XXX this should parse the actual arithmetic syntax
|
|
*/
|
|
size_t
|
|
array_ref_len(const char *cp)
|
|
{
|
|
const char *s = cp;
|
|
char c;
|
|
int depth = 0;
|
|
|
|
while ((c = *s++) && (c != ']' || --depth))
|
|
if (c == '[')
|
|
depth++;
|
|
if (!c)
|
|
return (0);
|
|
return (s - cp);
|
|
}
|
|
|
|
/*
|
|
* Make a copy of the base of an array name
|
|
*/
|
|
char *
|
|
arrayname(const char *str)
|
|
{
|
|
const char *p;
|
|
char *rv;
|
|
|
|
if ((p = cstrchr(str, '[')) == 0)
|
|
/* Shouldn't happen, but why worry? */
|
|
strdupx(rv, str, ATEMP);
|
|
else
|
|
strndupx(rv, str, p - str, ATEMP);
|
|
|
|
return (rv);
|
|
}
|
|
|
|
/* set (or overwrite, if reset) the array variable var to the values in vals */
|
|
mksh_uari_t
|
|
set_array(const char *var, bool reset, const char **vals)
|
|
{
|
|
struct tbl *vp, *vq;
|
|
mksh_uari_t i = 0, j = 0;
|
|
const char *ccp = var;
|
|
char *cp = NULL;
|
|
size_t n;
|
|
|
|
/* to get local array, use "local foo; set -A foo" */
|
|
n = strlen(var);
|
|
if (n > 0 && var[n - 1] == '+') {
|
|
/* append mode */
|
|
reset = false;
|
|
strndupx(cp, var, n - 1, ATEMP);
|
|
ccp = cp;
|
|
}
|
|
vp = global(ccp);
|
|
|
|
/* Note: AT&T ksh allows set -A but not set +A of a read-only var */
|
|
if ((vp->flag&RDONLY))
|
|
errorfx(2, "read-only: %s", ccp);
|
|
/* This code is quite non-optimal */
|
|
if (reset) {
|
|
/* trash existing values and attributes */
|
|
unset(vp, 1);
|
|
/* allocate-by-access the [0] element to keep in scope */
|
|
arraysearch(vp, 0);
|
|
}
|
|
/*
|
|
* TODO: would be nice for assignment to completely succeed or
|
|
* completely fail. Only really effects integer arrays:
|
|
* evaluation of some of vals[] may fail...
|
|
*/
|
|
if (cp != NULL) {
|
|
/* find out where to set when appending */
|
|
for (vq = vp; vq; vq = vq->u.array) {
|
|
if (!(vq->flag & ISSET))
|
|
continue;
|
|
if (arrayindex(vq) >= j)
|
|
j = arrayindex(vq) + 1;
|
|
}
|
|
afree(cp, ATEMP);
|
|
}
|
|
while ((ccp = vals[i])) {
|
|
#if 0 /* temporarily taken out due to regression */
|
|
if (*ccp == '[') {
|
|
int level = 0;
|
|
|
|
while (*ccp) {
|
|
if (*ccp == ']' && --level == 0)
|
|
break;
|
|
if (*ccp == '[')
|
|
++level;
|
|
++ccp;
|
|
}
|
|
if (*ccp == ']' && level == 0 && ccp[1] == '=') {
|
|
strndupx(cp, vals[i] + 1, ccp - (vals[i] + 1),
|
|
ATEMP);
|
|
evaluate(substitute(cp, 0), (mksh_ari_t *)&j,
|
|
KSH_UNWIND_ERROR, true);
|
|
afree(cp, ATEMP);
|
|
ccp += 2;
|
|
} else
|
|
ccp = vals[i];
|
|
}
|
|
#endif
|
|
|
|
vq = arraysearch(vp, j);
|
|
/* would be nice to deal with errors here... (see above) */
|
|
setstr(vq, ccp, KSH_RETURN_ERROR);
|
|
i++;
|
|
j++;
|
|
}
|
|
|
|
return (i);
|
|
}
|
|
|
|
void
|
|
change_winsz(void)
|
|
{
|
|
struct timeval tv;
|
|
|
|
mksh_TIME(tv);
|
|
BAFHUpdateMem_mem(qh_state, &tv, sizeof(tv));
|
|
|
|
#ifdef TIOCGWINSZ
|
|
/* check if window size has changed */
|
|
if (tty_init_fd() < 2) {
|
|
struct winsize ws;
|
|
|
|
if (ioctl(tty_fd, TIOCGWINSZ, &ws) >= 0) {
|
|
if (ws.ws_col)
|
|
x_cols = ws.ws_col;
|
|
if (ws.ws_row)
|
|
x_lins = ws.ws_row;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* bounds check for sane values, use defaults otherwise */
|
|
if (x_cols < MIN_COLS)
|
|
x_cols = 80;
|
|
if (x_lins < MIN_LINS)
|
|
x_lins = 24;
|
|
|
|
#ifdef SIGWINCH
|
|
got_winch = 0;
|
|
#endif
|
|
}
|
|
|
|
uint32_t
|
|
hash(const void *s)
|
|
{
|
|
register uint32_t h;
|
|
|
|
BAFHInit(h);
|
|
BAFHUpdateStr_reg(h, s);
|
|
BAFHFinish_reg(h);
|
|
return (h);
|
|
}
|
|
|
|
uint32_t
|
|
chvt_rndsetup(const void *bp, size_t sz)
|
|
{
|
|
register uint32_t h;
|
|
|
|
/* use LCG as seed but try to get them to deviate immediately */
|
|
h = lcg_state;
|
|
(void)rndget();
|
|
BAFHFinish_reg(h);
|
|
/* variation through pid, ppid, and the works */
|
|
BAFHUpdateMem_reg(h, &rndsetupstate, sizeof(rndsetupstate));
|
|
/* some variation, some possibly entropy, depending on OE */
|
|
BAFHUpdateMem_reg(h, bp, sz);
|
|
/* mix them all up */
|
|
BAFHFinish_reg(h);
|
|
|
|
return (h);
|
|
}
|
|
|
|
mksh_ari_t
|
|
rndget(void)
|
|
{
|
|
/*
|
|
* this is the same Linear Congruential PRNG as Borland
|
|
* C/C++ allegedly uses in its built-in rand() function
|
|
*/
|
|
return (((lcg_state = 22695477 * lcg_state + 1) >> 16) & 0x7FFF);
|
|
}
|
|
|
|
void
|
|
rndset(unsigned long v)
|
|
{
|
|
register uint32_t h;
|
|
#if defined(arc4random_pushb_fast) || defined(MKSH_A4PB)
|
|
register uint32_t t;
|
|
#endif
|
|
struct {
|
|
struct timeval tv;
|
|
void *sp;
|
|
uint32_t qh;
|
|
pid_t pp;
|
|
short r;
|
|
} z;
|
|
|
|
#ifdef DEBUG
|
|
/* clear the allocated space, for valgrind */
|
|
memset(&z, 0, sizeof(z));
|
|
#endif
|
|
|
|
h = lcg_state;
|
|
BAFHFinish_reg(h);
|
|
BAFHUpdateMem_reg(h, &v, sizeof(v));
|
|
|
|
mksh_TIME(z.tv);
|
|
z.sp = &lcg_state;
|
|
z.pp = procpid;
|
|
z.r = (short)rndget();
|
|
|
|
#if defined(arc4random_pushb_fast) || defined(MKSH_A4PB)
|
|
t = qh_state;
|
|
BAFHFinish_reg(t);
|
|
z.qh = (t & 0xFFFF8000) | rndget();
|
|
lcg_state = (t << 15) | rndget();
|
|
/*
|
|
* either we have very chap entropy get and push available,
|
|
* with malloc() pulling in this code already anyway, or the
|
|
* user requested us to use the old functions
|
|
*/
|
|
t = h;
|
|
BAFHUpdateMem_reg(t, &lcg_state, sizeof(lcg_state));
|
|
BAFHFinish_reg(t);
|
|
lcg_state = t;
|
|
#if defined(arc4random_pushb_fast)
|
|
arc4random_pushb_fast(&lcg_state, sizeof(lcg_state));
|
|
lcg_state = arc4random();
|
|
#else
|
|
lcg_state = arc4random_pushb(&lcg_state, sizeof(lcg_state));
|
|
#endif
|
|
BAFHUpdateMem_reg(h, &lcg_state, sizeof(lcg_state));
|
|
#else
|
|
z.qh = qh_state;
|
|
#endif
|
|
|
|
BAFHUpdateMem_reg(h, &z, sizeof(z));
|
|
BAFHFinish_reg(h);
|
|
lcg_state = h;
|
|
}
|
|
|
|
void
|
|
rndpush(const void *s)
|
|
{
|
|
register uint32_t h = qh_state;
|
|
|
|
BAFHUpdateStr_reg(h, s);
|
|
BAFHUpdateOctet_reg(h, 0);
|
|
qh_state = h;
|
|
}
|