1353 lines
30 KiB
C
1353 lines
30 KiB
C
/* $OpenBSD: var.c,v 1.34 2007/10/15 02:16:35 deraadt Exp $ */
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/var.c,v 1.71 2009/04/07 19:27:49 tg Exp $");
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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 tbl vtemp;
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static struct table specials;
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static char *formatstr(struct tbl *, const char *);
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static void export(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 struct tbl *arraysearch(struct tbl *, uint32_t);
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static const char *array_index_calc(const char *, bool *, uint32_t *);
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static int rnd_get(void);
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static void rnd_set(unsigned long);
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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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ainit(&l->area); /* todo: could use e->area (l->area => l->areap) */
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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->vars, &l->area, 0);
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ktinit(&l->funs, &l->area, 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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* 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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struct block *l = e->loc;
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struct tbl *vp, **vpp = l->vars.tbls, *vq;
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int i;
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e->loc = l->next; /* pop block */
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for (i = l->vars.size; --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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/* called by main() to initialise variable data structures */
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void
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initvar(void)
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{
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static const struct {
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const char *name;
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int v;
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} names[] = {
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{ "COLUMNS", V_COLUMNS },
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#if HAVE_PERSISTENT_HISTORY
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{ "HISTFILE", V_HISTFILE },
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#endif
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{ "HISTSIZE", V_HISTSIZE },
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{ "IFS", V_IFS },
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{ "LINENO", V_LINENO },
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{ "LINES", V_LINES },
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{ "OPTIND", V_OPTIND },
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{ "PATH", V_PATH },
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{ "RANDOM", V_RANDOM },
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{ "SECONDS", V_SECONDS },
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{ "TMOUT", V_TMOUT },
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{ "TMPDIR", V_TMPDIR },
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{ NULL, 0 }
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};
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int i;
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struct tbl *tp;
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ktinit(&specials, APERM, 16); /* must be 2^n (currently 12 specials) */
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for (i = 0; names[i].name; i++) {
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tp = ktenter(&specials, names[i].name, hash(names[i].name));
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tp->flag = DEFINED|ISSET;
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tp->type = names[i].v;
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}
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}
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/* Used to calculate an array index for global()/local(). Sets *arrayp to
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* non-zero if this is an array, sets *valp to the array index, returns
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* the basename of the array.
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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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int len;
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*arrayp = false;
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p = skip_varname(n, false);
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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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unsigned int h;
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bool array;
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uint32_t val;
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/* Check to see if this is an array */
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n = array_index_calc(n, &array, &val);
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h = hash(n);
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c = 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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for (c = 0; ksh_isdigit(*n); n++)
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c = c*10 + *n-'0';
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if (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 '!':
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/* 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;
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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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}
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return vp;
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}
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for (l = e->loc; ; l = l->next) {
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vp = ktsearch(&l->vars, n, h);
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if (vp != NULL) {
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if (array)
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return arraysearch(vp, val);
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else
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return vp;
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}
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if (l->next == NULL)
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break;
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}
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vp = ktenter(&l->vars, n, h);
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if (array)
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vp = arraysearch(vp, val);
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vp->flag |= DEFINED;
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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.
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*/
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struct tbl *
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local(const char *n, bool copy)
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{
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struct block *l = e->loc;
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struct tbl *vp;
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unsigned int h;
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bool array;
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uint32_t val;
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/* Check to see if this is an array */
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n = array_index_calc(n, &array, &val);
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h = hash(n);
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if (!ksh_isalphx(*n)) {
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vp = &vtemp;
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vp->flag = DEFINED|RDONLY;
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vp->type = 0;
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vp->areap = ATEMP;
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return vp;
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}
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vp = ktenter(&l->vars, n, h);
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if (copy && !(vp->flag & DEFINED)) {
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struct block *ll = l;
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struct tbl *vq = NULL;
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while ((ll = ll->next) && !(vq = ktsearch(&ll->vars, n, h)))
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;
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if (vq) {
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vp->flag |= vq->flag &
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(EXPORT | INTEGER | RDONLY | LJUST | RJUST |
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ZEROFIL | LCASEV | UCASEV_AL | INT_U | INT_L);
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if (vq->flag & INTEGER)
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vp->type = vq->type;
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vp->u2.field = vq->u2.field;
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}
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}
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if (array)
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vp = arraysearch(vp, val);
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vp->flag |= DEFINED;
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if (special(n))
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vp->flag |= SPECIAL;
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return vp;
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}
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/* get variable string value */
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char *
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str_val(struct tbl *vp)
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{
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char *s;
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if ((vp->flag&SPECIAL))
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getspec(vp);
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if (!(vp->flag&ISSET))
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s = null; /* special to dollar() */
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else if (!(vp->flag&INTEGER)) /* string source */
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s = vp->val.s + vp->type;
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else { /* integer source */
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/* worst case number length is when base=2, so use BITS(long) */
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/* minus base # number NUL */
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char strbuf[1 + 2 + 1 + 8 * sizeof (mksh_uari_t) + 1];
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const char *digits = (vp->flag & UCASEV_AL) ?
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" :
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"0123456789abcdefghijklmnopqrstuvwxyz";
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mksh_uari_t n;
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int base;
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s = strbuf + sizeof(strbuf);
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if (vp->flag & INT_U)
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n = vp->val.u;
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else
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n = (vp->val.i < 0) ? -vp->val.i : vp->val.i;
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base = (vp->type == 0) ? 10 : vp->type;
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if (base == 1) {
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size_t sz = 1;
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*(s = strbuf) = '1';
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s[1] = '#';
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if (!UTFMODE || ((n & 0xFF80) == 0xEF80))
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s[2] = n & 0xFF;
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else
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sz = utf_wctomb(s + 2, n);
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s[2 + sz] = '\0';
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} else {
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*--s = '\0';
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do {
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*--s = digits[n % base];
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n /= base;
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} while (n != 0);
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if (base != 10) {
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*--s = '#';
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*--s = digits[base % 10];
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if (base >= 10)
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*--s = digits[base / 10];
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}
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if (!(vp->flag & INT_U) && vp->val.i < 0)
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*--s = '-';
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}
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if (vp->flag & (RJUST|LJUST)) /* case already dealt with */
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s = formatstr(vp, s);
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else
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strdupx(s, s, ATEMP);
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}
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return s;
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}
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/* get variable integer value, with error checking */
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mksh_ari_t
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intval(struct tbl *vp)
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{
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mksh_ari_t num;
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int base;
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base = getint(vp, &num, false);
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if (base == -1)
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/* XXX check calls - is error here ok by POSIX? */
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errorf("%s: bad number", str_val(vp));
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return (num);
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}
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/* set variable to string value */
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int
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setstr(struct tbl *vq, const char *s, int error_ok)
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{
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char *salloc = NULL;
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int no_ro_check = error_ok & 0x4;
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error_ok &= ~0x4;
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if ((vq->flag & RDONLY) && !no_ro_check) {
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warningf(true, "%s: is read only", vq->name);
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if (!error_ok)
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errorfz();
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return 0;
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}
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if (!(vq->flag&INTEGER)) { /* string dest */
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if ((vq->flag&ALLOC)) {
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/* debugging */
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if (s >= vq->val.s &&
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s <= vq->val.s + strlen(vq->val.s))
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internal_errorf(
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"setstr: %s=%s: assigning to self",
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vq->name, s);
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afree(vq->val.s, vq->areap);
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}
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vq->flag &= ~(ISSET|ALLOC);
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vq->type = 0;
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if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST)))
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s = salloc = formatstr(vq, s);
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if ((vq->flag&EXPORT))
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export(vq, s);
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else {
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strdupx(vq->val.s, s, vq->areap);
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vq->flag |= ALLOC;
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}
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} else { /* integer dest */
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if (!v_evaluate(vq, s, error_ok, true))
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return (0);
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}
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vq->flag |= ISSET;
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if ((vq->flag&SPECIAL))
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setspec(vq);
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afree(salloc, ATEMP);
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return (1);
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}
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/* set variable to integer */
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void
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setint(struct tbl *vq, mksh_ari_t n)
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{
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if (!(vq->flag&INTEGER)) {
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struct tbl *vp = &vtemp;
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vp->flag = (ISSET|INTEGER);
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vp->type = 0;
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vp->areap = ATEMP;
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vp->val.i = n;
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/* setstr can't fail here */
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setstr(vq, str_val(vp), KSH_RETURN_ERROR);
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} else
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vq->val.i = n;
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vq->flag |= ISSET;
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if ((vq->flag&SPECIAL))
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setspec(vq);
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}
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int
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getint(struct tbl *vp, mksh_ari_t *nump, bool arith)
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{
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char *s;
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int c, base, neg;
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bool have_base = false;
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mksh_ari_t num;
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if (vp->flag&SPECIAL)
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getspec(vp);
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/* XXX is it possible for ISSET to be set and val.s to be 0? */
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if (!(vp->flag&ISSET) || (!(vp->flag&INTEGER) && vp->val.s == NULL))
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return -1;
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if (vp->flag&INTEGER) {
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*nump = vp->val.i;
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return vp->type;
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}
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s = vp->val.s + vp->type;
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if (s == NULL) /* redundant given initial test */
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s = null;
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base = 10;
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num = 0;
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neg = 0;
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if (arith && *s == '0' && *(s+1)) {
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s++;
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if (*s == 'x' || *s == 'X') {
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s++;
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base = 16;
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} else if (vp->flag & ZEROFIL) {
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while (*s == '0')
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s++;
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} else
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base = 8;
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have_base = true;
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}
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for (c = *s++; c ; c = *s++) {
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if (c == '-') {
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neg++;
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continue;
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} else if (c == '#') {
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base = (int)num;
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if (have_base || base < 1 || base > 36)
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return (-1);
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if (base == 1) {
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unsigned int wc;
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if (!UTFMODE)
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wc = *(unsigned char *)s;
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else if (utf_mbtowc(&wc, s) == (size_t)-1)
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wc = 0xEF00 + *(unsigned char *)s;
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*nump = (mksh_ari_t)wc;
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return (1);
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}
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num = 0;
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have_base = true;
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continue;
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} else if (ksh_isdigit(c))
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c -= '0';
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else if (ksh_islower(c))
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c -= 'a' - 10;
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else if (ksh_isupper(c))
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c -= 'A' - 10;
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else
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return -1;
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if (c < 0 || c >= base)
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return -1;
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num = num * base + c;
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}
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if (neg)
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num = -num;
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*nump = num;
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return base;
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}
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/* convert variable vq to integer variable, setting its value from vp
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* (vq and vp may be the same)
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*/
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struct tbl *
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setint_v(struct tbl *vq, struct tbl *vp, bool arith)
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{
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int base;
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mksh_ari_t num;
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if ((base = getint(vp, &num, arith)) == -1)
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return NULL;
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if (!(vq->flag & INTEGER) && (vq->flag & ALLOC)) {
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vq->flag &= ~ALLOC;
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afree(vq->val.s, vq->areap);
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}
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vq->val.i = num;
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if (vq->type == 0) /* default base */
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vq->type = base;
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vq->flag |= ISSET|INTEGER;
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if (vq->flag&SPECIAL)
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setspec(vq);
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return vq;
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}
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static char *
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formatstr(struct tbl *vp, const char *s)
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{
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int olen, nlen;
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char *p, *q;
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size_t psiz;
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olen = utf_mbswidth(s);
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if (vp->flag & (RJUST|LJUST)) {
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if (!vp->u2.field) /* default field width */
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vp->u2.field = olen;
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nlen = vp->u2.field;
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} else
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nlen = olen;
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p = alloc((psiz = nlen * /* MB_LEN_MAX */ 3 + 1), ATEMP);
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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[1] == '#')
|
|
n = 2;
|
|
else if (s[2] == '#')
|
|
n = 3;
|
|
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
|
|
export(struct tbl *vp, const char *val)
|
|
{
|
|
char *xp;
|
|
char *op = (vp->flag&ALLOC) ? vp->val.s : NULL;
|
|
int namelen = strlen(vp->name);
|
|
int vallen = strlen(val) + 1;
|
|
|
|
vp->flag |= ALLOC;
|
|
xp = alloc(namelen + 1 + vallen, vp->areap);
|
|
memcpy(vp->val.s = xp, vp->name, namelen);
|
|
xp += namelen;
|
|
*xp++ = '=';
|
|
vp->type = xp - vp->val.s; /* offset to value */
|
|
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, Tflag set, Tflag clr, int field, int base)
|
|
{
|
|
struct tbl *vp;
|
|
struct tbl *vpbase, *t;
|
|
char *tvar;
|
|
const char *val;
|
|
|
|
/* check for valid variable name, search for value */
|
|
val = skip_varname(var, false);
|
|
if (val == var)
|
|
return NULL;
|
|
if (*val == '[') {
|
|
int len;
|
|
|
|
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 preformed on the [expression] which would be a major
|
|
* security hole.
|
|
*/
|
|
if (set & IMPORT) {
|
|
int i;
|
|
for (i = 1; i < len - 1; i++)
|
|
if (!ksh_isdigit(val[i]))
|
|
return NULL;
|
|
}
|
|
val += len;
|
|
}
|
|
if (*val == '=')
|
|
strndupx(tvar, var, val++ - var, ATEMP);
|
|
else {
|
|
/* Importing from original environment: must have an = */
|
|
if (set & IMPORT)
|
|
return NULL;
|
|
strdupx(tvar, var, ATEMP);
|
|
val = NULL;
|
|
}
|
|
|
|
/* 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: restricted", tvar);
|
|
|
|
vp = (set&LOCAL) ? local(tvar, (set & LOCAL_COPY) ? true : false) :
|
|
global(tvar);
|
|
set &= ~(LOCAL|LOCAL_COPY);
|
|
|
|
vpbase = (vp->flag & ARRAY) ? global(arrayname(var)) : 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? */
|
|
errorf("%s: is read only", tvar);
|
|
afree(tvar, ATEMP);
|
|
|
|
/* most calls are with set/clr == 0 */
|
|
if (set | clr) {
|
|
int ok = 1;
|
|
/* 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) {
|
|
int 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 = 0;
|
|
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) {
|
|
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);
|
|
}
|
|
|
|
/* only x[0] is ever exported, so use vpbase */
|
|
if ((vpbase->flag&EXPORT) && !(vpbase->flag&INTEGER) &&
|
|
vpbase->type == 0)
|
|
export(vpbase, (vpbase->flag&ISSET) ? vpbase->val.s : null);
|
|
|
|
return vp;
|
|
}
|
|
|
|
/* Unset a variable. array_ref is set if there was an array reference in
|
|
* the name lookup (eg, x[2]).
|
|
*/
|
|
void
|
|
unset(struct tbl *vp, int array_ref)
|
|
{
|
|
if (vp->flag & ALLOC)
|
|
afree(vp->val.s, vp->areap);
|
|
if ((vp->flag & ARRAY) && !array_ref) {
|
|
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 foo[0] is being unset, the remainder of the array is kept... */
|
|
vp->flag &= SPECIAL | (array_ref ? ARRAY|DEFINED : 0);
|
|
if (vp->flag & SPECIAL)
|
|
unsetspec(vp); /* responsible for 'unspecial'ing var */
|
|
}
|
|
|
|
/* 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
|
|
* null if whole string is legal).
|
|
*/
|
|
const char *
|
|
skip_varname(const char *s, int aok)
|
|
{
|
|
int 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,
|
|
int aok) /* skip array de-reference? */
|
|
{
|
|
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 (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, int 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] == '=';
|
|
}
|
|
|
|
/*
|
|
* Make the exported environment from the exported names in the dictionary.
|
|
*/
|
|
char **
|
|
makenv(void)
|
|
{
|
|
struct block *l;
|
|
XPtrV denv;
|
|
struct tbl *vp, **vpp;
|
|
int i;
|
|
|
|
XPinit(denv, 64);
|
|
for (l = e->loc; l != NULL; l = l->next)
|
|
for (vpp = l->vars.tbls, i = l->vars.size; --i >= 0; )
|
|
if ((vp = *vpp++) != NULL &&
|
|
(vp->flag&(ISSET|EXPORT)) == (ISSET|EXPORT)) {
|
|
struct block *l2;
|
|
struct tbl *vp2;
|
|
unsigned int 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);
|
|
/* setstr can't fail here */
|
|
setstr(vp, val, KSH_RETURN_ERROR);
|
|
}
|
|
XPput(denv, vp->val.s);
|
|
}
|
|
XPput(denv, NULL);
|
|
return ((char **)XPclose(denv));
|
|
}
|
|
|
|
/*
|
|
* Get us a random number, either from rand(3) or arc4random(3), with
|
|
* the latter being preferred. If Flag(FARC4RANDOM) is 0, we use rand(3),
|
|
* otherwise arc4random(3). We have static caches to make change_random
|
|
* and writes to $RANDOM a cheap operation.
|
|
*/
|
|
#if HAVE_ARC4RANDOM && !defined(MKSH_SMALL)
|
|
static uint32_t rnd_cache[2];
|
|
static char rnd_lastflag = 2;
|
|
#endif
|
|
|
|
static int
|
|
rnd_get(void)
|
|
{
|
|
#if HAVE_ARC4RANDOM && defined(MKSH_SMALL)
|
|
return (arc4random() & 0x7FFF);
|
|
#else
|
|
#if HAVE_ARC4RANDOM
|
|
#if HAVE_ARC4RANDOM_PUSHB
|
|
uint32_t rv = 0;
|
|
#endif
|
|
if (Flag(FARC4RANDOM) != rnd_lastflag) {
|
|
if (Flag(FARC4RANDOM) == 0) {
|
|
/* transition to 0 by set: srand */
|
|
srand(arc4random() & 0x7FFF);
|
|
} else if (rnd_lastflag == 0) {
|
|
/* transition from 0: addrandom */
|
|
rnd_cache[0] ^= rand();
|
|
rnd_cache[1] ^= rand();
|
|
}
|
|
rnd_lastflag = Flag(FARC4RANDOM);
|
|
}
|
|
if (Flag(FARC4RANDOM)) {
|
|
if (rnd_cache[0] || rnd_cache[1])
|
|
#if HAVE_ARC4RANDOM_PUSHB
|
|
rv = arc4random_pushb(rnd_cache, sizeof (rnd_cache));
|
|
#else
|
|
arc4random_addrandom((void *)rnd_cache,
|
|
sizeof (rnd_cache));
|
|
#endif
|
|
rnd_cache[0] = rnd_cache[1] = 0;
|
|
return ((
|
|
#if HAVE_ARC4RANDOM_PUSHB
|
|
rv ? rv :
|
|
#endif
|
|
arc4random()) & 0x7FFF);
|
|
}
|
|
#endif
|
|
return (rand() & 0x7FFF);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
rnd_set(unsigned long newval)
|
|
{
|
|
#if HAVE_ARC4RANDOM && defined(MKSH_SMALL)
|
|
#if HAVE_ARC4RANDOM_PUSHB
|
|
arc4random_pushb(&newval, sizeof (newval));
|
|
#else
|
|
arc4random_addrandom((void *)&newval, sizeof (newval));
|
|
#endif
|
|
#else
|
|
#if HAVE_ARC4RANDOM
|
|
rnd_cache[0] ^= (newval << 15) | rand();
|
|
rnd_cache[1] ^= newval >> 17;
|
|
if (Flag(FARC4RANDOM) == 1)
|
|
return;
|
|
if (Flag(FARC4RANDOM) == 2)
|
|
Flag(FARC4RANDOM) = 0;
|
|
/* transition to 0 by write: only srand */
|
|
rnd_lastflag = 0;
|
|
#endif
|
|
srand(newval & 0x7FFF);
|
|
#endif
|
|
}
|
|
|
|
#if !HAVE_ARC4RANDOM || !defined(MKSH_SMALL)
|
|
/*
|
|
* Called after a fork in parent to bump the random number generator.
|
|
* Done to ensure children will not get the same random number sequence
|
|
* if the parent doesn't use $RANDOM.
|
|
*/
|
|
void
|
|
change_random(unsigned long newval)
|
|
{
|
|
int rval = 0;
|
|
|
|
#if HAVE_ARC4RANDOM
|
|
if (Flag(FARC4RANDOM)) {
|
|
rnd_cache[0] ^= (newval << 15) | rand();
|
|
rnd_cache[1] ^= newval >> 17;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
rval += newval & 0x7FFF;
|
|
newval >>= 15;
|
|
rval += newval & 0x7FFF;
|
|
newval >>= 15;
|
|
rval += newval + rand();
|
|
rval = (rval & 0x7FFF) ^ (rval >> 15);
|
|
|
|
srand(rval);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int i;
|
|
|
|
switch ((i = special(vp->name))) {
|
|
case V_SECONDS:
|
|
vp->flag &= ~SPECIAL;
|
|
/* On start up the value of SECONDS is used before seconds
|
|
* has been set - don't do anything in this case
|
|
* (see initcoms[] in main.c).
|
|
*/
|
|
if (vp->flag & ISSET) {
|
|
struct timeval tv;
|
|
|
|
gettimeofday(&tv, NULL);
|
|
setint(vp, tv.tv_sec - seconds);
|
|
}
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_RANDOM:
|
|
vp->flag &= ~SPECIAL;
|
|
setint(vp, rnd_get());
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_HISTSIZE:
|
|
vp->flag &= ~SPECIAL;
|
|
setint(vp, (mksh_ari_t)histsize);
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_OPTIND:
|
|
vp->flag &= ~SPECIAL;
|
|
setint(vp, (mksh_ari_t)user_opt.uoptind);
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_LINENO:
|
|
vp->flag &= ~SPECIAL;
|
|
setint(vp, (mksh_ari_t)current_lineno + user_lineno);
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
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.
|
|
*/
|
|
vp->flag &= ~SPECIAL;
|
|
change_winsz();
|
|
setint(vp, i == V_COLUMNS ? x_cols : x_lins);
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
setspec(struct tbl *vp)
|
|
{
|
|
int i;
|
|
char *s;
|
|
|
|
switch (special(vp->name)) {
|
|
case V_PATH:
|
|
if (path)
|
|
afree(path, APERM);
|
|
s = str_val(vp);
|
|
strdupx(path, s, APERM);
|
|
flushcom(1); /* clear tracked aliases */
|
|
break;
|
|
case V_IFS:
|
|
setctypes(s = str_val(vp), C_IFS);
|
|
ifs0 = *s;
|
|
break;
|
|
case V_OPTIND:
|
|
vp->flag &= ~SPECIAL;
|
|
getopts_reset((int)intval(vp));
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
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);
|
|
if (s[0] == '/' && access(s, W_OK|X_OK) == 0 &&
|
|
stat(s, &statb) == 0 && S_ISDIR(statb.st_mode))
|
|
strdupx(tmpdir, s, APERM);
|
|
}
|
|
break;
|
|
case V_HISTSIZE:
|
|
vp->flag &= ~SPECIAL;
|
|
sethistsize((int)intval(vp));
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
#if HAVE_PERSISTENT_HISTORY
|
|
case V_HISTFILE:
|
|
sethistfile(str_val(vp));
|
|
break;
|
|
#endif
|
|
case V_COLUMNS:
|
|
vp->flag &= ~SPECIAL;
|
|
if ((i = intval(vp)) >= MIN_COLS)
|
|
x_cols = i;
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_LINES:
|
|
vp->flag &= ~SPECIAL;
|
|
if ((i = intval(vp)) >= MIN_LINS)
|
|
x_lins = i;
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_RANDOM:
|
|
vp->flag &= ~SPECIAL;
|
|
rnd_set(intval(vp));
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_SECONDS:
|
|
vp->flag &= ~SPECIAL;
|
|
{
|
|
struct timeval tv;
|
|
|
|
gettimeofday(&tv, NULL);
|
|
seconds = tv.tv_sec - intval(vp);
|
|
}
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
case V_TMOUT:
|
|
/* at&t ksh seems to do this (only listen if integer) */
|
|
if (vp->flag & INTEGER)
|
|
ksh_tmout = vp->val.i >= 0 ? vp->val.i : 0;
|
|
break;
|
|
case V_LINENO:
|
|
vp->flag &= ~SPECIAL;
|
|
/* The -1 is because line numbering starts at 1. */
|
|
user_lineno = (unsigned int)intval(vp) - current_lineno - 1;
|
|
vp->flag |= SPECIAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
unsetspec(struct tbl *vp)
|
|
{
|
|
switch (special(vp->name)) {
|
|
case V_PATH:
|
|
if (path)
|
|
afree(path, APERM);
|
|
strdupx(path, def_path, APERM);
|
|
flushcom(1); /* clear tracked aliases */
|
|
break;
|
|
case V_IFS:
|
|
setctypes(" \t\n", C_IFS);
|
|
ifs0 = ' ';
|
|
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;
|
|
|
|
/* 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':
|
|
* no effect: IFS, COLUMNS, PATH, TMPDIR
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search for (and possibly create) a table entry starting with
|
|
* vp, indexed by val.
|
|
*/
|
|
static struct tbl *
|
|
arraysearch(struct tbl *vp, uint32_t val)
|
|
{
|
|
struct tbl *prev, *curr, *new;
|
|
size_t namelen = strlen(vp->name) + 1;
|
|
|
|
vp->flag |= ARRAY|DEFINED;
|
|
vp->index = 0;
|
|
/* The table entry is always [0] */
|
|
if (val == 0)
|
|
return vp;
|
|
prev = vp;
|
|
curr = vp->u.array;
|
|
while (curr && curr->index < val) {
|
|
prev = curr;
|
|
curr = curr->u.array;
|
|
}
|
|
if (curr && curr->index == val) {
|
|
if (curr->flag&ISSET)
|
|
return curr;
|
|
else
|
|
new = curr;
|
|
} else
|
|
new = alloc(sizeof (struct tbl) + namelen, vp->areap);
|
|
strlcpy(new->name, vp->name, namelen);
|
|
new->flag = vp->flag & ~(ALLOC|DEFINED|ISSET|SPECIAL);
|
|
new->type = vp->type;
|
|
new->areap = vp->areap;
|
|
new->u2.field = vp->u2.field;
|
|
new->index = val;
|
|
if (curr != new) { /* not reusing old array entry */
|
|
prev->u.array = new;
|
|
new->u.array = curr;
|
|
}
|
|
return new;
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
int
|
|
array_ref_len(const char *cp)
|
|
{
|
|
const char *s = cp;
|
|
int 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.
|
|
*/
|
|
void
|
|
set_array(const char *var, int reset, const char **vals)
|
|
{
|
|
struct tbl *vp, *vq;
|
|
uint32_t i;
|
|
|
|
/* to get local array, use "typeset foo; set -A foo" */
|
|
vp = global(var);
|
|
|
|
/* Note: at&t ksh allows set -A but not set +A of a read-only var */
|
|
if ((vp->flag&RDONLY))
|
|
errorf("%s: is read only", var);
|
|
/* This code is quite non-optimal */
|
|
if (reset > 0)
|
|
/* trash existing values and attributes */
|
|
unset(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...
|
|
*/
|
|
for (i = 0; vals[i]; i++) {
|
|
vq = arraysearch(vp, i);
|
|
/* would be nice to deal with errors here... (see above) */
|
|
setstr(vq, vals[i], KSH_RETURN_ERROR);
|
|
}
|
|
}
|
|
|
|
void
|
|
change_winsz(void)
|
|
{
|
|
if (x_lins < 0) {
|
|
/* first time initialisation */
|
|
#ifdef TIOCGWINSZ
|
|
if (tty_fd < 0)
|
|
/* non-FTALKING, try to get an fd anyway */
|
|
tty_init(false, false);
|
|
#endif
|
|
x_cols = -1;
|
|
}
|
|
|
|
#ifdef TIOCGWINSZ
|
|
/* check if window size has changed since first time */
|
|
if (tty_fd >= 0) {
|
|
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;
|
|
}
|