ref: 28d864953c3d6a879b5c6d81524128851621d654
dir: /sys/src/ape/cmd/pdksh/var.c/
#include "sh.h" #include "ksh_time.h" #include "ksh_limval.h" #include "ksh_stat.h" #include <ctype.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 ARGS((struct tbl *vp, const char *s)); static void export ARGS((struct tbl *vp, const char *val)); static int special ARGS((const char *name)); static void unspecial ARGS((const char *name)); static void getspec ARGS((struct tbl *vp)); static void setspec ARGS((struct tbl *vp)); static void unsetspec ARGS((struct tbl *vp)); static struct tbl *arraysearch ARGS((struct tbl *, int)); /* * create a new block for function calls and simple commands * assume caller has allocated and set up e->loc */ void newblock() { register struct block *l; static char *const empty[] = {null}; l = (struct block *) 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 = (char **) empty; } else { l->argc = e->loc->argc; l->argv = e->loc->argv; } l->exit = l->error = NULL; tinit(&l->vars, &l->area, 0); tinit(&l->funs, &l->area, 0); l->next = e->loc; e->loc = l; } /* * pop a block handling special variables */ void popblock() { register struct block *l = e->loc; register struct tbl *vp, **vpp = l->vars.tbls, *vq; register 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 initialize variable data structures */ void initvar() { 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 }, #ifdef HISTORY { "HISTFILE", V_HISTFILE }, { "HISTSIZE", V_HISTSIZE }, #endif /* HISTORY */ #ifdef EDIT { "EDITOR", V_EDITOR }, { "VISUAL", V_VISUAL }, #endif /* EDIT */ #ifdef KSH { "MAIL", V_MAIL }, { "MAILCHECK", V_MAILCHECK }, { "MAILPATH", V_MAILPATH }, { "RANDOM", V_RANDOM }, { "SECONDS", V_SECONDS }, { "TMOUT", V_TMOUT }, #endif /* KSH */ { "LINENO", V_LINENO }, { (char *) 0, 0 } }; int i; struct tbl *tp; tinit(&specials, APERM, 32); /* must be 2^n (currently 17 specials) */ for (i = 0; names[i].name; i++) { tp = tenter(&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. */ const char * array_index_calc(const char *n, bool_t *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; long 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); if (rval < 0 || rval > ARRAYMAX) errorf("%s: subscript out of range", n); *valp = rval; afree(sub, ATEMP); } return n; } /* * Search for variable, if not found create globally. */ struct tbl * global(n) register const char *n; { register struct block *l = e->loc; register struct tbl *vp; register int c; unsigned h; bool_t array; int val; /* Check to see if this is an array */ n = array_index_calc(n, &array, &val); h = hash(n); c = 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)) { for (c = 0; digit(*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 = tsearch(&l->vars, n, h); if (vp != NULL) if (array) return arraysearch(vp, val); else return vp; if (l->next == NULL) break; } vp = tenter(&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(n, copy) register const char *n; bool_t copy; { register struct block *l = e->loc; register struct tbl *vp; unsigned h; bool_t 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 = tenter(&l->vars, n, h); if (copy && !(vp->flag & DEFINED)) { struct block *ll = l; struct tbl *vq = (struct tbl *) 0; while ((ll = ll->next) && !(vq = tsearch(&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(vp) register 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 BITS(long) */ /* minus base # number null */ static char strbuf[1 + 2 + 1 + BITS(long) + 1]; const char *digits = (vp->flag & UCASEV_AL) ? "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" : "0123456789abcdefghijklmnopqrstuvwxyz"; register unsigned long n; register int base; s = strbuf + sizeof(strbuf); if (vp->flag & INT_U) n = (unsigned long) vp->val.i; else n = (vp->val.i < 0) ? -vp->val.i : vp->val.i; base = (vp->type == 0) ? 10 : vp->type; *--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); } return s; } /* get variable integer value, with error checking */ long intval(vp) register struct tbl *vp; { long num; int base; base = getint(vp, &num); 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(vq, s, error_ok) register struct tbl *vq; const char *s; int error_ok; { if (vq->flag & RDONLY) { 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(TRUE, "setstr: %s=%s: assigning to self", vq->name, s); afree((void*)vq->val.s, vq->areap); } vq->flag &= ~(ISSET|ALLOC); vq->type = 0; if (s && (vq->flag & (UCASEV_AL|LCASEV|LJUST|RJUST))) s = formatstr(vq, s); if ((vq->flag&EXPORT)) export(vq, s); else { vq->val.s = str_save(s, vq->areap); if (vq->val.s) /* <sjg> don't lie */ vq->flag |= ALLOC; } } else /* integer dest */ if (!v_evaluate(vq, s, error_ok)) return 0; vq->flag |= ISSET; if ((vq->flag&SPECIAL)) setspec(vq); return 1; } /* set variable to integer */ void setint(vq, n) register struct tbl *vq; long n; { if (!(vq->flag&INTEGER)) { register 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(vp, nump) struct tbl *vp; long *nump; { register char *s; register int c; int base, neg; int have_base = 0; long 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) /* redundent given initial test */ s = null; base = 10; num = 0; neg = 0; for (c = *s++; c ; c = *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(vq, vp) register struct tbl *vq, *vp; { int base; long num; if ((base = getint(vp, &num)) == -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(vp, s) 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 = (char *) alloc(nlen + 1, ATEMP); if (vp->flag & (RJUST|LJUST)) { int slen; if (vp->flag & RJUST) { const char *q = s + olen; /* strip trailing spaces (at&t ksh uses q[-1] == ' ') */ while (q > s && isspace(q[-1])) --q; slen = q - 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(*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(*q)) *q = toupper(*q); } else if (vp->flag & LCASEV) { for (q = p; *q; q++) if (isupper(*q)) *q = tolower(*q); } return p; } /* * make vp->val.s be "name=value" for quick exporting. */ static void export(vp, val) register struct tbl *vp; const char *val; { register 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 = (char*)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((void*)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(var, set, clr, field, base) register const char *var; Tflag clr, set; int field, base; { register 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 envirnment: 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(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); 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; char UNINITIALIZED(*s); char UNINITIALIZED(*free_me); 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 = (char *) 0; } else { s = t->val.s + t->type; free_me = (t->flag & ALLOC) ? t->val.s : (char *) 0; } 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 varibale, but keep * the flag settings. */ ok = 0; if (t->flag & INTEGER) t->flag &= ~ISSET; else { if (t->flag & ALLOC) afree((void*) t->val.s, t->areap); t->flag &= ~(ISSET|ALLOC); t->type = 0; } } if (free_me) afree((void *) 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); /* 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); } /* 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(vp, array_ref) register struct tbl *vp; int array_ref; { if (vp->flag & ALLOC) afree((void*)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((void *) tmp->val.s, tmp->areap); afree(tmp, tmp->areap); } vp->u.array = (struct tbl *) 0; } /* 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(s, aok) 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(s, aok) 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(s, aok) 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(s) 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() { struct block *l = e->loc; XPtrV env; register struct tbl *vp, **vpp; register int i; XPinit(env, 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)) { register struct block *l2; register struct tbl *vp2; unsigned h = hash(vp->name); /* unexport any redefined instances */ for (l2 = l->next; l2 != NULL; l2 = l2->next) { vp2 = tsearch(&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() { rand(); } /* * handle special variables with side effects - PATH, SECONDS. */ /* Test if name is a special parameter */ static int special(name) register const char * name; { register struct tbl *tp; tp = tsearch(&specials, name, hash(name)); return tp && (tp->flag & ISSET) ? tp->type : V_NONE; } /* Make a variable non-special */ static void unspecial(name) register const char * name; { register struct tbl *tp; tp = tsearch(&specials, name, hash(name)); if (tp) tdelete(tp); } #ifdef KSH static time_t seconds; /* time SECONDS last set */ #endif /* KSH */ static int user_lineno; /* what user set $LINENO to */ static void getspec(vp) register struct tbl *vp; { switch (special(vp->name)) { #ifdef KSH 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) setint(vp, (long) (time((time_t *)0) - seconds)); vp->flag |= SPECIAL; break; case V_RANDOM: vp->flag &= ~SPECIAL; setint(vp, (long) (rand() & 0x7fff)); vp->flag |= SPECIAL; break; #endif /* KSH */ #ifdef HISTORY case V_HISTSIZE: vp->flag &= ~SPECIAL; setint(vp, (long) histsize); vp->flag |= SPECIAL; break; #endif /* HISTORY */ case V_OPTIND: vp->flag &= ~SPECIAL; setint(vp, (long) user_opt.uoptind); vp->flag |= SPECIAL; break; case V_LINENO: vp->flag &= ~SPECIAL; setint(vp, (long) current_lineno + user_lineno); vp->flag |= SPECIAL; break; } } static void setspec(vp) register struct tbl *vp; { char *s; switch (special(vp->name)) { case V_PATH: if (path) afree(path, APERM); 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: if (tmpdir) { afree(tmpdir, APERM); tmpdir = (char *) 0; } /* Use tmpdir iff it is an absolute path, is writable and * searchable and is a directory... */ { struct stat statb; s = str_val(vp); if (ISABSPATH(s) && eaccess(s, W_OK|X_OK) == 0 && stat(s, &statb) == 0 && S_ISDIR(statb.st_mode)) tmpdir = str_save(s, APERM); } break; #ifdef HISTORY case V_HISTSIZE: vp->flag &= ~SPECIAL; sethistsize((int) intval(vp)); vp->flag |= SPECIAL; break; case V_HISTFILE: sethistfile(str_val(vp)); break; #endif /* HISTORY */ #ifdef EDIT 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: if ((x_cols = intval(vp)) <= MIN_COLS) x_cols = MIN_COLS; break; #endif /* EDIT */ #ifdef KSH 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; case V_RANDOM: vp->flag &= ~SPECIAL; srand((unsigned int)intval(vp)); vp->flag |= SPECIAL; break; case V_SECONDS: vp->flag &= ~SPECIAL; seconds = time((time_t*) 0) - 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; #endif /* KSH */ 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(vp) register struct tbl *vp; { switch (special(vp->name)) { case V_PATH: if (path) afree(path, APERM); 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 */ if (tmpdir) { afree(tmpdir, APERM); tmpdir = (char *) 0; } break; #ifdef KSH case V_MAIL: mbset((char *) 0); break; case V_MAILPATH: mpset((char *) 0); break; #endif /* KSH */ case V_LINENO: #ifdef KSH case V_MAILCHECK: /* at&t ksh leaves previous value in place */ case V_RANDOM: case V_SECONDS: case V_TMOUT: /* at&t ksh leaves previous value in place */ #endif /* KSH */ 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(vp, val) struct tbl *vp; int val; { struct tbl *prev, *curr, *new; vp->flag |= ARRAY|DEFINED; /* The table entry is always [0] */ if (val == 0) { vp->index = 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 = (struct tbl *)alloc(sizeof(struct tbl)+strlen(vp->name)+1, vp->areap); strcpy(new->name, vp->name); 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(cp) 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(str) 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(var, reset, vals) 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); } }