--- /dev/null
+/* $OpenBSD: var.c,v 1.34 2007/10/15 02:16:35 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ * Thorsten Glaser <tg@mirbsd.org>
+ *
+ * Provided that these terms and disclaimer and all copyright notices
+ * are retained or reproduced in an accompanying document, permission
+ * is granted to deal in this work without restriction, including un-
+ * limited rights to use, publicly perform, distribute, sell, modify,
+ * merge, give away, or sublicence.
+ *
+ * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
+ * the utmost extent permitted by applicable law, neither express nor
+ * implied; without malicious intent or gross negligence. In no event
+ * may a licensor, author or contributor be held liable for indirect,
+ * direct, other damage, loss, or other issues arising in any way out
+ * of dealing in the work, even if advised of the possibility of such
+ * damage or existence of a defect, except proven that it results out
+ * of said person's immediate fault when using the work as intended.
+ */
+
+#include "sh.h"
+
+#if defined(__OpenBSD__)
+#include <sys/sysctl.h>
+#endif
+
+__RCSID("$MirOS: src/bin/mksh/var.c,v 1.110 2010/07/25 11:35:43 tg Exp $");
+
+/*
+ * Variables
+ *
+ * WARNING: unreadable code, needs a rewrite
+ *
+ * if (flag&INTEGER), val.i contains integer value, and type contains base.
+ * otherwise, (val.s + type) contains string value.
+ * if (flag&EXPORT), val.s contains "name=value" for E-Z exporting.
+ */
+static struct tbl vtemp;
+static struct table specials;
+static char *formatstr(struct tbl *, const char *);
+static void exportprep(struct tbl *, const char *);
+static int special(const char *);
+static void unspecial(const char *);
+static void getspec(struct tbl *);
+static void setspec(struct tbl *);
+static void unsetspec(struct tbl *);
+static int getint(struct tbl *, mksh_ari_t *, bool);
+static mksh_ari_t intval(struct tbl *);
+static struct tbl *arraysearch(struct tbl *, uint32_t);
+static const char *array_index_calc(const char *, bool *, uint32_t *);
+static uint32_t oaathash_update(register uint32_t, register const uint8_t *,
+ register size_t);
+static uint32_t oaathash_finalise(register uint32_t);
+
+uint8_t set_refflag = 0;
+
+/*
+ * create a new block for function calls and simple commands
+ * assume caller has allocated and set up e->loc
+ */
+void
+newblock(void)
+{
+ struct block *l;
+ static const char *empty[] = { null };
+
+ l = alloc(sizeof(struct block), ATEMP);
+ l->flags = 0;
+ ainit(&l->area); /* todo: could use e->area (l->area => l->areap) */
+ if (!e->loc) {
+ l->argc = 0;
+ l->argv = empty;
+ } else {
+ l->argc = e->loc->argc;
+ l->argv = e->loc->argv;
+ }
+ l->exit = l->error = NULL;
+ ktinit(&l->vars, &l->area, 0);
+ ktinit(&l->funs, &l->area, 0);
+ l->next = e->loc;
+ e->loc = l;
+}
+
+/*
+ * pop a block handling special variables
+ */
+void
+popblock(void)
+{
+ struct block *l = e->loc;
+ struct tbl *vp, **vpp = l->vars.tbls, *vq;
+ int i;
+
+ e->loc = l->next; /* pop block */
+ for (i = l->vars.size; --i >= 0; )
+ if ((vp = *vpp++) != NULL && (vp->flag&SPECIAL)) {
+ if ((vq = global(vp->name))->flag & ISSET)
+ setspec(vq);
+ else
+ unsetspec(vq);
+ }
+ if (l->flags & BF_DOGETOPTS)
+ user_opt = l->getopts_state;
+ afreeall(&l->area);
+ afree(l, ATEMP);
+}
+
+/* called by main() to initialise variable data structures */
+#define VARSPEC_DEFNS
+#include "var_spec.h"
+
+enum var_specs {
+#define VARSPEC_ENUMS
+#include "var_spec.h"
+ V_MAX
+};
+
+static const char * const initvar_names[] = {
+#define VARSPEC_ITEMS
+#include "var_spec.h"
+};
+
+void
+initvar(void)
+{
+ int i = 0;
+ struct tbl *tp;
+
+ ktinit(&specials, APERM,
+ /* must be 80% of 2^n (currently 12 specials) */ 16);
+ while (i < V_MAX - 1) {
+ tp = ktenter(&specials, initvar_names[i],
+ hash(initvar_names[i]));
+ tp->flag = DEFINED|ISSET;
+ tp->type = ++i;
+ }
+}
+
+/* Used to calculate an array index for global()/local(). Sets *arrayp to
+ * true if this is an array, sets *valp to the array index, returns
+ * the basename of the array.
+ */
+static const char *
+array_index_calc(const char *n, bool *arrayp, uint32_t *valp)
+{
+ const char *p;
+ int len;
+ char *ap = NULL;
+
+ *arrayp = false;
+ redo_from_ref:
+ p = skip_varname(n, false);
+ if (!set_refflag && (p != n) && ksh_isalphx(n[0])) {
+ struct block *l = e->loc;
+ struct tbl *vp;
+ char *vn;
+ uint32_t h;
+
+ strndupx(vn, n, p - n, ATEMP);
+ h = hash(vn);
+ /* check if this is a reference */
+ do {
+ vp = ktsearch(&l->vars, vn, h);
+ } while (!vp && (l = l->next));
+ afree(vn, ATEMP);
+ if (vp && (vp->flag & (DEFINED|ASSOC|ARRAY)) ==
+ (DEFINED|ASSOC)) {
+ char *cp;
+
+ /* gotcha! */
+ cp = shf_smprintf("%s%s", str_val(vp), p);
+ afree(ap, ATEMP);
+ n = ap = cp;
+ goto redo_from_ref;
+ }
+ }
+
+ if (p != n && *p == '[' && (len = array_ref_len(p))) {
+ char *sub, *tmp;
+ mksh_ari_t rval;
+
+ /* Calculate the value of the subscript */
+ *arrayp = true;
+ strndupx(tmp, p + 1, len - 2, ATEMP);
+ sub = substitute(tmp, 0);
+ afree(tmp, ATEMP);
+ strndupx(n, n, p - n, ATEMP);
+ evaluate(sub, &rval, KSH_UNWIND_ERROR, true);
+ *valp = (uint32_t)rval;
+ afree(sub, ATEMP);
+ }
+ return (n);
+}
+
+/*
+ * Search for variable, if not found create globally.
+ */
+struct tbl *
+global(const char *n)
+{
+ struct block *l = e->loc;
+ struct tbl *vp;
+ int c;
+ bool array;
+ uint32_t h, val;
+
+ /* Check to see if this is an array */
+ n = array_index_calc(n, &array, &val);
+ h = hash(n);
+ c = n[0];
+ if (!ksh_isalphx(c)) {
+ if (array)
+ errorf("bad substitution");
+ vp = &vtemp;
+ vp->flag = DEFINED;
+ vp->type = 0;
+ vp->areap = ATEMP;
+ *vp->name = c;
+ if (ksh_isdigit(c)) {
+ for (c = 0; ksh_isdigit(*n); n++)
+ c = c*10 + *n-'0';
+ if (c <= l->argc)
+ /* setstr can't fail here */
+ setstr(vp, l->argv[c], KSH_RETURN_ERROR);
+ vp->flag |= RDONLY;
+ return (vp);
+ }
+ vp->flag |= RDONLY;
+ if (n[1] != '\0')
+ return (vp);
+ vp->flag |= ISSET|INTEGER;
+ switch (c) {
+ case '$':
+ vp->val.i = kshpid;
+ break;
+ case '!':
+ /* If no job, expand to nothing */
+ if ((vp->val.i = j_async()) == 0)
+ vp->flag &= ~(ISSET|INTEGER);
+ break;
+ case '?':
+ vp->val.i = exstat;
+ break;
+ case '#':
+ vp->val.i = l->argc;
+ break;
+ case '-':
+ vp->flag &= ~INTEGER;
+ vp->val.s = getoptions();
+ break;
+ default:
+ vp->flag &= ~(ISSET|INTEGER);
+ }
+ return (vp);
+ }
+ for (l = e->loc; ; l = l->next) {
+ vp = ktsearch(&l->vars, n, h);
+ if (vp != NULL) {
+ if (array)
+ return (arraysearch(vp, val));
+ else
+ return (vp);
+ }
+ if (l->next == NULL)
+ break;
+ }
+ vp = ktenter(&l->vars, n, h);
+ if (array)
+ vp = arraysearch(vp, val);
+ vp->flag |= DEFINED;
+ if (special(n))
+ vp->flag |= SPECIAL;
+ return (vp);
+}
+
+/*
+ * Search for local variable, if not found create locally.
+ */
+struct tbl *
+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 */
+ n = array_index_calc(n, &array, &val);
+ h = hash(n);
+ if (!ksh_isalphx(*n)) {
+ vp = &vtemp;
+ vp->flag = DEFINED|RDONLY;
+ vp->type = 0;
+ vp->areap = ATEMP;
+ return (vp);
+ }
+ vp = ktenter(&l->vars, n, h);
+ if (copy && !(vp->flag & DEFINED)) {
+ struct block *ll = l;
+ struct tbl *vq = NULL;
+
+ while ((ll = ll->next) && !(vq = ktsearch(&ll->vars, n, h)))
+ ;
+ if (vq) {
+ vp->flag |= vq->flag &
+ (EXPORT | INTEGER | RDONLY | LJUST | RJUST |
+ ZEROFIL | LCASEV | UCASEV_AL | INT_U | INT_L);
+ if (vq->flag & INTEGER)
+ vp->type = vq->type;
+ vp->u2.field = vq->u2.field;
+ }
+ }
+ if (array)
+ vp = arraysearch(vp, 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))
+ s = null; /* special to dollar() */
+ else if (!(vp->flag&INTEGER)) /* string source */
+ s = vp->val.s + vp->type;
+ else { /* integer source */
+ /* 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;
+ mksh_uari_t n;
+ int base;
+
+ s = strbuf + sizeof(strbuf);
+ if (vp->flag & INT_U)
+ n = vp->val.u;
+ else
+ n = (vp->val.i < 0) ? -vp->val.i : vp->val.i;
+ base = (vp->type == 0) ? 10 : vp->type;
+
+ 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);
+}
+
+/* get variable integer value, with error checking */
+static mksh_ari_t
+intval(struct tbl *vp)
+{
+ mksh_ari_t num;
+ int base;
+
+ base = getint(vp, &num, false);
+ if (base == -1)
+ /* XXX check calls - is error here ok by POSIX? */
+ errorf("%s: bad number", str_val(vp));
+ return (num);
+}
+
+/* set variable to string value */
+int
+setstr(struct tbl *vq, const char *s, int error_ok)
+{
+ char *salloc = NULL;
+ int no_ro_check = error_ok & 0x4;
+
+ error_ok &= ~0x4;
+ if ((vq->flag & RDONLY) && !no_ro_check) {
+ warningf(true, "%s: is read only", vq->name);
+ if (!error_ok)
+ errorfz();
+ return (0);
+ }
+ if (!(vq->flag&INTEGER)) { /* string dest */
+ if ((vq->flag&ALLOC)) {
+ /* 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);
+ 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_t *nump, bool arith)
+{
+ char *s;
+ int c, base, neg;
+ bool have_base = false;
+ mksh_ari_t num;
+
+ if (vp->flag&SPECIAL)
+ getspec(vp);
+ /* XXX is it possible for ISSET to be set and val.s to be 0? */
+ if (!(vp->flag&ISSET) || (!(vp->flag&INTEGER) && vp->val.s == NULL))
+ return (-1);
+ if (vp->flag&INTEGER) {
+ *nump = vp->val.i;
+ return (vp->type);
+ }
+ s = vp->val.s + vp->type;
+ if (s == NULL) /* redundant given initial test */
+ s = null;
+ base = 10;
+ num = 0;
+ neg = 0;
+ if (arith && *s == '0' && *(s+1)) {
+ s++;
+ if (*s == 'x' || *s == 'X') {
+ s++;
+ base = 16;
+ } else if (vp->flag & ZEROFIL) {
+ while (*s == '0')
+ s++;
+ } else
+ base = 8;
+ have_base = true;
+ }
+ for (c = *s++; c ; c = *s++) {
+ if (c == '-') {
+ neg++;
+ continue;
+ } else if (c == '#') {
+ base = (int)num;
+ if (have_base || base < 1 || base > 36)
+ return (-1);
+ if (base == 1) {
+ unsigned int wc;
+
+ if (!UTFMODE)
+ wc = *(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 + *(unsigned char *)s;
+ *nump = (mksh_ari_t)wc;
+ return (1);
+ }
+ 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 < 0 || c >= base)
+ return (-1);
+ num = num * base + c;
+ }
+ if (neg)
+ num = -num;
+ *nump = 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_t num;
+
+ if ((base = getint(vp, &num, arith)) == -1)
+ return (NULL);
+ if (!(vq->flag & INTEGER) && (vq->flag & ALLOC)) {
+ vq->flag &= ~ALLOC;
+ afree(vq->val.s, vq->areap);
+ }
+ vq->val.i = num;
+ if (vq->type == 0) /* default base */
+ vq->type = base;
+ vq->flag |= ISSET|INTEGER;
+ if (vq->flag&SPECIAL)
+ setspec(vq);
+ return (vq);
+}
+
+static char *
+formatstr(struct tbl *vp, const char *s)
+{
+ int olen, nlen;
+ char *p, *q;
+ size_t psiz;
+
+ olen = 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[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
+exportprep(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;
+ int len;
+
+ /* check for valid variable name, search for value */
+ val = skip_varname(var, false);
+ if (val == var)
+ return (NULL);
+ mkssert(var != NULL);
+ mkssert(*var != 0);
+ if (*val == '[') {
+ if (set_refflag)
+ errorf("%s: reference variable cannot be an array",
+ var);
+ 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;
+ /* 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';
+ }
+
+ /* 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);
+ if (set_refflag == 2 && (vp->flag & (ARRAY|ASSOC)) == ASSOC)
+ vp->flag &= ~ASSOC;
+ else if (set_refflag == 1) {
+ 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(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) {
+ 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) {
+ 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)
+ 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)
+ 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
+ * NUL 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;
+ 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);
+ }
+ XPput(denv, NULL);
+ return ((char **)XPclose(denv));
+}
+
+/* Bob Jenkins' one-at-a-time hash */
+static uint32_t
+oaathash_update(register uint32_t h, register const uint8_t *cp,
+ register size_t n)
+{
+ while (n--) {
+ h += *cp++;
+ h += h << 10;
+ h ^= h >> 6;
+ }
+
+ return (h);
+}
+
+static uint32_t
+oaathash_finalise(register uint32_t h)
+{
+ h += h << 3;
+ h ^= h >> 11;
+ h += h << 15;
+
+ return (h);
+}
+
+uint32_t
+oaathash_full(register const uint8_t *bp)
+{
+ register uint32_t h = 0;
+ register uint8_t c;
+
+ while ((c = *bp++)) {
+ h += c;
+ h += h << 10;
+ h ^= h >> 6;
+ }
+
+ return (oaathash_finalise(h));
+}
+
+void
+change_random(const void *vp, size_t n)
+{
+ register uint32_t h = 0x100;
+#if defined(__OpenBSD__)
+ int mib[2];
+ uint8_t k[3];
+ size_t klen;
+#endif
+
+ kshstate_v.cr_dp = vp;
+ kshstate_v.cr_dsz = n;
+ gettimeofday(&kshstate_v.cr_tv, NULL);
+ h = oaathash_update(oaathash_update(h, (void *)&kshstate_v,
+ sizeof(kshstate_v)), vp, n);
+ kshstate_v.lcg_state_ = oaathash_finalise(h);
+
+#if defined(__OpenBSD__)
+ /* OpenBSD, MirBSD: proper kernel entropy comes at zero cost */
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_ARND;
+ klen = sizeof(k);
+ sysctl(mib, 2, k, &klen, &kshstate_v.lcg_state_,
+ sizeof(kshstate_v.lcg_state_));
+ /* we ignore failures and take in k anyway */
+ h = oaathash_update(h, k, sizeof(k));
+ kshstate_v.lcg_state_ = oaathash_finalise(h);
+#elif defined(MKSH_A4PB)
+ /* forced by the user to use arc4random_pushb(3) • Cygwin? */
+ {
+ uint32_t prv;
+
+ prv = arc4random_pushb(&kshstate_v.lcg_state_,
+ sizeof(kshstate_v.lcg_state_));
+ h = oaathash_update(h, &prv, sizeof(prv));
+ }
+ kshstate_v.lcg_state_ = oaathash_finalise(h);
+#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)
+{
+ register mksh_ari_t i;
+ int st;
+
+ switch ((st = special(vp->name))) {
+ 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) {
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+ i = tv.tv_sec - seconds;
+ } else
+ return;
+ break;
+ case V_RANDOM:
+ /*
+ * this is the same Linear Congruential PRNG as Borland
+ * C/C++ allegedly uses in its built-in rand() function
+ */
+ i = ((kshstate_v.lcg_state_ =
+ 22695477 * kshstate_v.lcg_state_ + 1) >> 16) & 0x7FFF;
+ break;
+ case V_HISTSIZE:
+ i = histsize;
+ break;
+ case V_OPTIND:
+ i = user_opt.uoptind;
+ break;
+ case V_LINENO:
+ i = current_lineno + user_lineno;
+ 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.
+ */
+ change_winsz();
+ i = st == V_COLUMNS ? x_cols : x_lins;
+ break;
+ default:
+ /* do nothing, do not touch vp at all */
+ return;
+ }
+ vp->flag &= ~SPECIAL;
+ setint(vp, i);
+ vp->flag |= SPECIAL;
+}
+
+static void
+setspec(struct tbl *vp)
+{
+ mksh_ari_t i;
+ char *s;
+ int st;
+
+ switch ((st = special(vp->name))) {
+ case V_PATH:
+ if (path)
+ afree(path, APERM);
+ s = str_val(vp);
+ strdupx(path, s, APERM);
+ flushcom(1); /* clear tracked aliases */
+ return;
+ case V_IFS:
+ setctypes(s = str_val(vp), C_IFS);
+ ifs0 = *s;
+ 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);
+ if (s[0] == '/' && access(s, W_OK|X_OK) == 0 &&
+ stat(s, &statb) == 0 && S_ISDIR(statb.st_mode))
+ strdupx(tmpdir, s, APERM);
+ }
+ break;
+#if HAVE_PERSISTENT_HISTORY
+ case V_HISTFILE:
+ sethistfile(str_val(vp));
+ break;
+#endif
+ 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;
+
+ /* common sub-cases */
+ case V_OPTIND:
+ case V_HISTSIZE:
+ case V_COLUMNS:
+ case V_LINES:
+ case V_RANDOM:
+ case V_SECONDS:
+ case V_LINENO:
+ vp->flag &= ~SPECIAL;
+ i = intval(vp);
+ 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_OPTIND:
+ getopts_reset((int)i);
+ break;
+ case V_HISTSIZE:
+ sethistsize((int)i);
+ break;
+ case V_COLUMNS:
+ if (i >= MIN_COLS)
+ x_cols = i;
+ break;
+ case V_LINES:
+ if (i >= MIN_LINS)
+ x_lins = i;
+ break;
+ case V_RANDOM:
+ /*
+ * mksh R39d+ no longer has the traditional repeatability
+ * of $RANDOM sequences, but always retains state
+ */
+ change_random(&i, sizeof(i));
+ break;
+ case V_SECONDS:
+ {
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+ seconds = tv.tv_sec - i;
+ }
+ break;
+ case V_LINENO:
+ /* The -1 is because line numbering starts at 1. */
+ user_lineno = (unsigned int)i - current_lineno - 1;
+ 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': 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, *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;
+ len = strlen(vp->name) + 1;
+ if (!news) {
+ 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.
+ */
+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 */
+mksh_uari_t
+set_array(const char *var, bool reset, const char **vals)
+{
+ struct tbl *vp, *vq;
+ mksh_uari_t i;
+ const char *ccp;
+#ifndef MKSH_SMALL
+ char *cp;
+ mksh_uari_t j;
+#endif
+
+ /* 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)
+ /* trash existing values and attributes */
+ unset(vp, 1);
+ /* todo: would be nice for assignment to completely succeed or
+ * completely fail. Only really effects integer arrays:
+ * evaluation of some of vals[] may fail...
+ */
+ i = 0;
+#ifndef MKSH_SMALL
+ j = 0;
+#else
+#define j i
+#endif
+ while ((ccp = vals[i])) {
+#ifndef MKSH_SMALL
+ 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++;
+#ifndef MKSH_SMALL
+ j++;
+#endif
+ }
+
+ return (i);
+}
+
+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 */
+ 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;
+
+#ifdef SIGWINCH
+ got_winch = 0;
+#endif
+}
+
+uint32_t
+evilhash(const char *s)
+{
+ register uint32_t h = 0x100;
+
+ h = oaathash_update(h, (void *)&kshstate_f, sizeof(kshstate_f));
+ kshstate_f.h = oaathash_full((const uint8_t *)s);
+ return (oaathash_finalise(oaathash_update(h,
+ (void *)&kshstate_f.h, sizeof(kshstate_f.h))));
+}
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