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IABSD.fr/src/bin/ksh/var.c
kn
- bin/ksh/var.c
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/* $OpenBSD: var.c,v 1.73 2023/07/23 23:42:03 kn Exp $ */ #include <sys/stat.h> #include <sys/time.h> #include <ctype.h> #include <errno.h> #include <inttypes.h> #include <limits.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <unistd.h> #ifndef SMALL # include <term.h> # include <curses.h> #endif #include "sh.h" /* * 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 export(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 struct tbl *arraysearch(struct tbl *, int); /* * create a new block for function calls and simple commands * assume caller has allocated and set up genv->loc */ void newblock(void) { struct block *l; static char *const empty[] = {null}; l = alloc(sizeof(struct block), ATEMP); l->flags = 0; ainit(&l->area); /* todo: could use genv->area (l->area => l->areap) */ if (!genv->loc) { l->argc = 0; l->argv = (char **) empty; } else { l->argc = genv->loc->argc; l->argv = genv->loc->argv; } l->exit = l->error = NULL; ktinit(&l->vars, &l->area, 0); ktinit(&l->funs, &l->area, 0); l->next = genv->loc; genv->loc = l; } /* * pop a block handling special variables */ void popblock(void) { struct block *l = genv->loc; struct tbl *vp, **vpp = l->vars.tbls, *vq; int i; genv->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 initialize variable data structures */ void initvar(void) { static const struct { const char *name; int v; } names[] = { { "COLUMNS", V_COLUMNS }, { "IFS", V_IFS }, { "OPTIND", V_OPTIND }, { "PATH", V_PATH }, { "POSIXLY_CORRECT", V_POSIXLY_CORRECT }, { "TMPDIR", V_TMPDIR }, { "HISTCONTROL", V_HISTCONTROL }, { "HISTFILE", V_HISTFILE }, { "HISTSIZE", V_HISTSIZE }, { "EDITOR", V_EDITOR }, { "VISUAL", V_VISUAL }, #ifndef SMALL { "MAIL", V_MAIL }, { "MAILCHECK", V_MAILCHECK }, { "MAILPATH", V_MAILPATH }, #endif /* SMALL */ { "RANDOM", V_RANDOM }, { "SECONDS", V_SECONDS }, { "TMOUT", V_TMOUT }, { "LINENO", V_LINENO }, { "TERM", V_TERM }, { NULL, 0 } }; int i; struct tbl *tp; ktinit(&specials, APERM, 32); /* must be 2^n (currently 19 specials) */ for (i = 0; names[i].name; i++) { tp = ktenter(&specials, names[i].name, hash(names[i].name)); tp->flag = DEFINED|ISSET; tp->type = names[i].v; } } /* Used to calculate an array index for global()/local(). Sets *arrayp to * non-zero 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, int *valp) { const char *p; int len; *arrayp = false; p = skip_varname(n, false); if (p != n && *p == '[' && (len = array_ref_len(p))) { char *sub, *tmp; int64_t rval; /* Calculate the value of the subscript */ *arrayp = true; tmp = str_nsave(p+1, len-2, ATEMP); sub = substitute(tmp, 0); afree(tmp, ATEMP); n = str_nsave(n, p - n, ATEMP); evaluate(sub, &rval, KSH_UNWIND_ERROR, true); if (rval < 0 || rval > INT_MAX) errorf("%s: subscript %" PRIi64 " out of range", n, rval); *valp = rval; afree(sub, ATEMP); } return n; } /* * Search for variable, if not found create globally. */ struct tbl * global(const char *n) { struct block *l = genv->loc; struct tbl *vp; long num; int c; unsigned int h; bool array; int val; /* Check to see if this is an array */ n = array_index_calc(n, &array, &val); h = hash(n); c = (unsigned char)n[0]; if (!letter(c)) { if (array) errorf("bad substitution"); vp = &vtemp; vp->flag = DEFINED; vp->type = 0; vp->areap = ATEMP; *vp->name = c; if (digit(c)) { errno = 0; num = strtol(n, NULL, 10); if (errno == 0 && num <= l->argc) /* setstr can't fail here */ setstr(vp, l->argv[num], 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 = genv->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 = genv->loc; struct tbl *vp; unsigned int h; bool array; int val; /* Check to see if this is an array */ n = array_index_calc(n, &array, &val); h = hash(n); if (!letter(*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, so use * minus base # number BITS(int64_t) NUL */ char strbuf[1 + 2 + 1 + BITS(int64_t) + 1]; const char *digits = (vp->flag & UCASEV_AL) ? "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" : "0123456789abcdefghijklmnopqrstuvwxyz"; uint64_t n; unsigned int base; s = strbuf + sizeof(strbuf); if (vp->flag & INT_U) n = (uint64_t) vp->val.i; else n = (vp->val.i < 0) ? -vp->val.i : vp->val.i; base = (vp->type == 0) ? 10 : vp->type; if (base < 2 || base > strlen(digits)) base = 10; *--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 s = str_save(s, ATEMP); } return s; } /* get variable integer value, with error checking */ int64_t intval(struct tbl *vp) { int64_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) { const char *fs = NULL; int no_ro_check = error_ok & KSH_IGNORE_RDONLY; error_ok &= ~KSH_IGNORE_RDONLY; if ((vq->flag & RDONLY) && !no_ro_check) { warningf(true, "%s: is read only", vq->name); if (!error_ok) errorf(NULL); 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("%s: %s=%s: assigning to self", __func__, 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))) fs = s = formatstr(vq, s); if ((vq->flag&EXPORT)) export(vq, s); else { vq->val.s = str_save(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((void *)fs, ATEMP); return 1; } /* set variable to integer */ void setint(struct tbl *vq, int64_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); } int getint(struct tbl *vp, int64_t *nump, bool arith) { char *s; int c; int base, neg; int have_base = 0; int64_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++; } for (c = (unsigned char)*s++; c ; c = (unsigned char)*s++) { if (c == '-') { neg++; } else if (c == '#') { base = (int) num; if (have_base || base < 2 || base > 36) return -1; num = 0; have_base = 1; } else if (letnum(c)) { if (isdigit(c)) c -= '0'; else if (islower(c)) c -= 'a' - 10; /* todo: assumes ascii */ else if (isupper(c)) c -= 'A' - 10; /* todo: assumes ascii */ else c = -1; /* _: force error */ if (c < 0 || c >= base) return -1; num = num * base + c; } else return -1; } 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; int64_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; olen = strlen(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(nlen + 1, ATEMP); if (vp->flag & (RJUST|LJUST)) { int slen; if (vp->flag & RJUST) { const char *r = s + olen; /* strip trailing spaces (at&t ksh uses r[-1] == ' ') */ while (r > s && isspace((unsigned char)r[-1])) --r; slen = r - s; if (slen > vp->u2.field) { s += slen - vp->u2.field; slen = vp->u2.field; } shf_snprintf(p, nlen + 1, ((vp->flag & ZEROFIL) && digit(*s)) ? "%0*s%.*s" : "%*s%.*s", vp->u2.field - slen, null, slen, s); } else { /* strip leading spaces/zeros */ while (isspace((unsigned char)*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, olen + 1); if (vp->flag & UCASEV_AL) { for (q = p; *q; q++) if (islower((unsigned char)*q)) *q = toupper((unsigned char)*q); } else if (vp->flag & LCASEV) { for (q = p; *q; q++) if (isupper((unsigned char)*q)) *q = tolower((unsigned char)*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); 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, int set, int 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 (!digit(val[i])) return NULL; } val += len; } if (*val == '=') tvar = str_nsave(var, val++ - var, ATEMP); else { /* Importing from original environment: must have an = */ if (set & IMPORT) return NULL; tvar = (char *) var; 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(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? */ errorf("%s: is read only", tvar); if (val) 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; int error_ok = KSH_RETURN_ERROR; 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; } if (!(t->flag & RDONLY) && (set & RDONLY)) { /* allow var to be initialized read-only */ error_ok |= KSH_IGNORE_RDONLY; } 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, error_ok)) { /* 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; } } afree(free_me, t->areap); } } if (!ok) errorf(NULL); } if (val != NULL) { if (vp->flag&INTEGER) { /* do not zero base before assignment */ setstr(vp, val, KSH_UNWIND_ERROR | KSH_IGNORE_RDONLY); /* 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 | KSH_IGNORE_RDONLY); } /* 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). */ char * skip_varname(const char *s, int aok) { int alen; if (s && letter(*s)) { while (*++s && letnum(*s)) ; if (aok && *s == '[' && (alen = array_ref_len(s))) s += alen; } return (char *) s; } /* Return a pointer to the first character past any legal variable name. */ char * skip_wdvarname(const char *s, int aok) /* skip array de-reference? */ { if (s[0] == CHAR && letter(s[1])) { do { s += 2; } while (s[0] == CHAR && letnum(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 (char *) s; } /* Check if coded string s is a variable name */ int is_wdvarname(const char *s, int aok) { 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) { 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 env; struct tbl *vp, **vpp; int i; XPinit(env, 64); for (l = genv->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(env, vp->val.s); } XPput(env, NULL); return (char **) XPclose(env); } /* * 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(void) { rand(); } /* * 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 struct timespec seconds; /* time SECONDS last set */ static int user_lineno; /* what user set $LINENO to */ static void getspec(struct tbl *vp) { switch (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 timespec difference, now; clock_gettime(CLOCK_MONOTONIC, &now); timespecsub(&now, &seconds, &difference); setint(vp, (int64_t)difference.tv_sec); } vp->flag |= SPECIAL; break; case V_RANDOM: vp->flag &= ~SPECIAL; setint(vp, (int64_t) (rand() & 0x7fff)); vp->flag |= SPECIAL; break; case V_HISTSIZE: vp->flag &= ~SPECIAL; setint(vp, (int64_t) histsize); vp->flag |= SPECIAL; break; case V_OPTIND: vp->flag &= ~SPECIAL; setint(vp, (int64_t) user_opt.uoptind); vp->flag |= SPECIAL; break; case V_LINENO: vp->flag &= ~SPECIAL; setint(vp, (int64_t) current_lineno + user_lineno); vp->flag |= SPECIAL; break; } } static void setspec(struct tbl *vp) { char *s; switch (special(vp->name)) { case V_PATH: afree(search_path, APERM); search_path = str_save(str_val(vp), 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_POSIXLY_CORRECT: change_flag(FPOSIX, OF_SPECIAL, 1); break; case V_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)) tmpdir = str_save(s, APERM); } break; case V_HISTCONTROL: sethistcontrol(str_val(vp)); break; case V_HISTSIZE: vp->flag &= ~SPECIAL; sethistsize((int) intval(vp)); vp->flag |= SPECIAL; break; case V_HISTFILE: sethistfile(str_val(vp)); break; case V_VISUAL: set_editmode(str_val(vp)); break; case V_EDITOR: if (!(global("VISUAL")->flag & ISSET)) set_editmode(str_val(vp)); break; case V_COLUMNS: { int64_t l; if (getint(vp, &l, false) == -1) { x_cols = MIN_COLS; break; } if (l <= MIN_COLS || l > INT_MAX) x_cols = MIN_COLS; else x_cols = l; } break; #ifndef SMALL case V_MAIL: mbset(str_val(vp)); break; case V_MAILPATH: mpset(str_val(vp)); break; case V_MAILCHECK: vp->flag &= ~SPECIAL; mcset(intval(vp)); vp->flag |= SPECIAL; break; #endif /* SMALL */ case V_RANDOM: vp->flag &= ~SPECIAL; srand_deterministic((unsigned int)intval(vp)); vp->flag |= SPECIAL; break; case V_SECONDS: vp->flag &= ~SPECIAL; clock_gettime(CLOCK_MONOTONIC, &seconds); seconds.tv_sec -= intval(vp); vp->flag |= SPECIAL; break; case V_TMOUT: /* Enforce integer to avoid command execution from initcoms[] */ vp->flag &= ~SPECIAL; intval(vp); vp->flag |= SPECIAL; /* 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; case V_TERM: #ifndef SMALL { int ret; vp->flag &= ~SPECIAL; if (setupterm(str_val(vp), shl_out->fd, &ret) == ERR) del_curterm(cur_term); vp->flag |= SPECIAL; } #endif break; } } static void unsetspec(struct tbl *vp) { switch (special(vp->name)) { case V_PATH: afree(search_path, APERM); search_path = str_save(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 */ afree(tmpdir, APERM); tmpdir = NULL; break; #ifndef SMALL case V_MAIL: mbset(NULL); break; case V_MAILPATH: mpset(NULL); break; #endif /* SMALL */ case V_HISTCONTROL: sethistcontrol(NULL); break; case V_LINENO: #ifndef SMALL case V_MAILCHECK: /* at&t ksh leaves previous value in place */ #endif /* SMALL */ 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: * MAIL, MAILPATH, HISTSIZE, HISTFILE, * Unsetting these in at&t ksh does not loose the `specialness': * no effect: IFS, COLUMNS, PATH, TMPDIR, * VISUAL, EDITOR, * pdkshisms: no effect: * POSIXLY_CORRECT (use set +o posix instead) */ } } /* * Search for (and possibly create) a table entry starting with * vp, indexed by val. */ static struct tbl * arraysearch(struct tbl *vp, int 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; if ((p = strchr(str, '[')) == 0) /* Shouldn't happen, but why worry? */ return (char *) str; return str_nsave(str, p - str, ATEMP); } /* Set (or overwrite, if !reset) the array variable var to the values in vals. */ void set_array(const char *var, int reset, char **vals) { struct tbl *vp, *vq; int 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); } }