var.c revision 194765
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/var.c 194765 2009-06-23 20:45:12Z jilles $"); 401556Srgrimes 4117987Speter#include <unistd.h> 4217987Speter#include <stdlib.h> 43114763Sobrien#include <paths.h> 4417987Speter 451556Srgrimes/* 461556Srgrimes * Shell variables. 471556Srgrimes */ 481556Srgrimes 4917525Sache#include <locale.h> 5017525Sache 511556Srgrimes#include "shell.h" 521556Srgrimes#include "output.h" 531556Srgrimes#include "expand.h" 541556Srgrimes#include "nodes.h" /* for other headers */ 551556Srgrimes#include "eval.h" /* defines cmdenviron */ 561556Srgrimes#include "exec.h" 571556Srgrimes#include "syntax.h" 581556Srgrimes#include "options.h" 591556Srgrimes#include "mail.h" 601556Srgrimes#include "var.h" 611556Srgrimes#include "memalloc.h" 621556Srgrimes#include "error.h" 631556Srgrimes#include "mystring.h" 6420425Ssteve#include "parser.h" 6517987Speter#ifndef NO_HISTORY 6617987Speter#include "myhistedit.h" 6717987Speter#endif 681556Srgrimes 691556Srgrimes 701556Srgrimes#define VTABSIZE 39 711556Srgrimes 721556Srgrimes 731556Srgrimesstruct varinit { 741556Srgrimes struct var *var; 751556Srgrimes int flags; 761556Srgrimes char *text; 7790111Simp void (*func)(const char *); 781556Srgrimes}; 791556Srgrimes 801556Srgrimes 8117987Speter#ifndef NO_HISTORY 821556Srgrimesstruct var vhistsize; 8317987Speter#endif 841556Srgrimesstruct var vifs; 851556Srgrimesstruct var vmail; 861556Srgrimesstruct var vmpath; 871556Srgrimesstruct var vpath; 8897689Stjrstruct var vppid; 891556Srgrimesstruct var vps1; 901556Srgrimesstruct var vps2; 91159632Sstefanfstruct var vps4; 921556Srgrimesstruct var vvers; 93117261SddsSTATIC struct var voptind; 941556Srgrimes 95117261SddsSTATIC const struct varinit varinit[] = { 9617987Speter#ifndef NO_HISTORY 9720425Ssteve { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=", 9820425Ssteve sethistsize }, 9917987Speter#endif 10020425Ssteve { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n", 10120425Ssteve NULL }, 10220425Ssteve { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=", 10320425Ssteve NULL }, 10420425Ssteve { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=", 10520425Ssteve NULL }, 106114763Sobrien { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=" _PATH_DEFPATH, 10720425Ssteve changepath }, 10897689Stjr { &vppid, VSTRFIXED|VTEXTFIXED|VUNSET, "PPID=", 10997689Stjr NULL }, 1108855Srgrimes /* 1111556Srgrimes * vps1 depends on uid 1121556Srgrimes */ 11320425Ssteve { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ", 11420425Ssteve NULL }, 115159632Sstefanf { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 116159632Sstefanf NULL }, 11720425Ssteve { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1", 11820425Ssteve getoptsreset }, 11920425Ssteve { NULL, 0, NULL, 12020425Ssteve NULL } 1211556Srgrimes}; 1221556Srgrimes 123117261SddsSTATIC struct var *vartab[VTABSIZE]; 1241556Srgrimes 12590111SimpSTATIC struct var **hashvar(char *); 12690111SimpSTATIC int varequal(char *, char *); 12790111SimpSTATIC int localevar(char *); 1281556Srgrimes 1291556Srgrimes/* 130155302Sschweikh * Initialize the variable symbol tables and import the environment. 1311556Srgrimes */ 1321556Srgrimes 1331556Srgrimes#ifdef mkinit 1341556SrgrimesINCLUDE "var.h" 1351556SrgrimesINIT { 1361556Srgrimes char **envp; 1371556Srgrimes extern char **environ; 1381556Srgrimes 1391556Srgrimes initvar(); 1401556Srgrimes for (envp = environ ; *envp ; envp++) { 1411556Srgrimes if (strchr(*envp, '=')) { 1421556Srgrimes setvareq(*envp, VEXPORT|VTEXTFIXED); 1431556Srgrimes } 1441556Srgrimes } 1451556Srgrimes} 1461556Srgrimes#endif 1471556Srgrimes 1481556Srgrimes 1491556Srgrimes/* 1501556Srgrimes * This routine initializes the builtin variables. It is called when the 1511556Srgrimes * shell is initialized and again when a shell procedure is spawned. 1521556Srgrimes */ 1531556Srgrimes 1541556Srgrimesvoid 15590111Simpinitvar(void) 15690111Simp{ 15797689Stjr char ppid[20]; 1581556Srgrimes const struct varinit *ip; 1591556Srgrimes struct var *vp; 1601556Srgrimes struct var **vpp; 1611556Srgrimes 1621556Srgrimes for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { 1631556Srgrimes if ((vp->flags & VEXPORT) == 0) { 1641556Srgrimes vpp = hashvar(ip->text); 1651556Srgrimes vp->next = *vpp; 1661556Srgrimes *vpp = vp; 1671556Srgrimes vp->text = ip->text; 1681556Srgrimes vp->flags = ip->flags; 16920425Ssteve vp->func = ip->func; 1701556Srgrimes } 1711556Srgrimes } 1721556Srgrimes /* 1731556Srgrimes * PS1 depends on uid 1741556Srgrimes */ 1751556Srgrimes if ((vps1.flags & VEXPORT) == 0) { 1761556Srgrimes vpp = hashvar("PS1="); 1771556Srgrimes vps1.next = *vpp; 1781556Srgrimes *vpp = &vps1; 1791556Srgrimes vps1.text = geteuid() ? "PS1=$ " : "PS1=# "; 1801556Srgrimes vps1.flags = VSTRFIXED|VTEXTFIXED; 1811556Srgrimes } 18297689Stjr if ((vppid.flags & VEXPORT) == 0) { 18397689Stjr fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); 18497689Stjr setvarsafe("PPID", ppid, 0); 18597689Stjr } 1861556Srgrimes} 1871556Srgrimes 1881556Srgrimes/* 18920425Ssteve * Safe version of setvar, returns 1 on success 0 on failure. 19020425Ssteve */ 19120425Ssteve 19220425Ssteveint 19390111Simpsetvarsafe(char *name, char *val, int flags) 19420425Ssteve{ 19520425Ssteve struct jmploc jmploc; 196194765Sjilles struct jmploc *const savehandler = handler; 19720425Ssteve int err = 0; 19820425Ssteve 19920425Ssteve if (setjmp(jmploc.loc)) 20020425Ssteve err = 1; 20120425Ssteve else { 20220425Ssteve handler = &jmploc; 20320425Ssteve setvar(name, val, flags); 20420425Ssteve } 20520425Ssteve handler = savehandler; 20620425Ssteve return err; 20720425Ssteve} 20820425Ssteve 20920425Ssteve/* 210155302Sschweikh * Set the value of a variable. The flags argument is stored with the 2111556Srgrimes * flags of the variable. If val is NULL, the variable is unset. 2121556Srgrimes */ 2131556Srgrimes 2141556Srgrimesvoid 21590111Simpsetvar(char *name, char *val, int flags) 21617987Speter{ 2171556Srgrimes char *p, *q; 2181556Srgrimes int len; 2191556Srgrimes int namelen; 2201556Srgrimes char *nameeq; 2211556Srgrimes int isbad; 2221556Srgrimes 2231556Srgrimes isbad = 0; 2241556Srgrimes p = name; 22517525Sache if (! is_name(*p)) 2261556Srgrimes isbad = 1; 22717525Sache p++; 2281556Srgrimes for (;;) { 2291556Srgrimes if (! is_in_name(*p)) { 2301556Srgrimes if (*p == '\0' || *p == '=') 2311556Srgrimes break; 2321556Srgrimes isbad = 1; 2331556Srgrimes } 2341556Srgrimes p++; 2351556Srgrimes } 2361556Srgrimes namelen = p - name; 2371556Srgrimes if (isbad) 2381556Srgrimes error("%.*s: bad variable name", namelen, name); 2391556Srgrimes len = namelen + 2; /* 2 is space for '=' and '\0' */ 2401556Srgrimes if (val == NULL) { 2411556Srgrimes flags |= VUNSET; 2421556Srgrimes } else { 2431556Srgrimes len += strlen(val); 2441556Srgrimes } 2451556Srgrimes p = nameeq = ckmalloc(len); 2461556Srgrimes q = name; 2471556Srgrimes while (--namelen >= 0) 2481556Srgrimes *p++ = *q++; 2491556Srgrimes *p++ = '='; 2501556Srgrimes *p = '\0'; 2511556Srgrimes if (val) 2521556Srgrimes scopy(val, p); 2531556Srgrimes setvareq(nameeq, flags); 2541556Srgrimes} 2551556Srgrimes 25617525SacheSTATIC int 25790111Simplocalevar(char *s) 25890111Simp{ 25917525Sache static char *lnames[7] = { 26017525Sache "ALL", "COLLATE", "CTYPE", "MONETARY", 26117525Sache "NUMERIC", "TIME", NULL 26217525Sache }; 26317525Sache char **ss; 2641556Srgrimes 26517525Sache if (*s != 'L') 26617525Sache return 0; 26717525Sache if (varequal(s + 1, "ANG")) 26817525Sache return 1; 26917525Sache if (strncmp(s + 1, "C_", 2) != 0) 27017525Sache return 0; 27117525Sache for (ss = lnames; *ss ; ss++) 27217525Sache if (varequal(s + 3, *ss)) 27317525Sache return 1; 27417525Sache return 0; 27517525Sache} 2761556Srgrimes 277171268Sscf 2781556Srgrimes/* 279171268Sscf * Sets/unsets an environment variable from a pointer that may actually be a 280171268Sscf * pointer into environ where the string should not be manipulated. 281171268Sscf */ 282171268Sscfstatic void 283171268Sscfchange_env(char *s, int set) 284171268Sscf{ 285171268Sscf char *eqp; 286171268Sscf char *ss; 287171268Sscf 288171268Sscf ss = savestr(s); 289171268Sscf if ((eqp = strchr(ss, '=')) != NULL) 290171268Sscf *eqp = '\0'; 291171268Sscf if (set && eqp != NULL) 292171268Sscf (void) setenv(ss, eqp + 1, 1); 293171268Sscf else 294171268Sscf (void) unsetenv(ss); 295171268Sscf ckfree(ss); 296171268Sscf 297171268Sscf return; 298171268Sscf} 299171268Sscf 300171268Sscf 301171268Sscf/* 3021556Srgrimes * Same as setvar except that the variable and value are passed in 3031556Srgrimes * the first argument as name=value. Since the first argument will 3041556Srgrimes * be actually stored in the table, it should not be a string that 3051556Srgrimes * will go away. 3061556Srgrimes */ 3071556Srgrimes 3081556Srgrimesvoid 30990111Simpsetvareq(char *s, int flags) 31017987Speter{ 3111556Srgrimes struct var *vp, **vpp; 31290112Simp int len; 3131556Srgrimes 31445263Scracauer if (aflag) 31545263Scracauer flags |= VEXPORT; 3161556Srgrimes vpp = hashvar(s); 3171556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 3181556Srgrimes if (varequal(s, vp->text)) { 3191556Srgrimes if (vp->flags & VREADONLY) { 32090112Simp len = strchr(s, '=') - s; 3211556Srgrimes error("%.*s: is read only", len, s); 3221556Srgrimes } 3231556Srgrimes INTOFF; 32420425Ssteve 32520425Ssteve if (vp->func && (flags & VNOFUNC) == 0) 32620425Ssteve (*vp->func)(strchr(s, '=') + 1); 32720425Ssteve 3281556Srgrimes if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) 3291556Srgrimes ckfree(vp->text); 33020425Ssteve 33120425Ssteve vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); 3321556Srgrimes vp->flags |= flags; 3331556Srgrimes vp->text = s; 33420425Ssteve 33520425Ssteve /* 33620425Ssteve * We could roll this to a function, to handle it as 33720425Ssteve * a regular variable function callback, but why bother? 33820425Ssteve */ 3391556Srgrimes if (vp == &vmpath || (vp == &vmail && ! mpathset())) 3401556Srgrimes chkmail(1); 34117525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 342171268Sscf change_env(s, 1); 34317525Sache (void) setlocale(LC_ALL, ""); 34417525Sache } 3451556Srgrimes INTON; 3461556Srgrimes return; 3471556Srgrimes } 3481556Srgrimes } 3491556Srgrimes /* not found */ 3501556Srgrimes vp = ckmalloc(sizeof (*vp)); 3511556Srgrimes vp->flags = flags; 3521556Srgrimes vp->text = s; 3531556Srgrimes vp->next = *vpp; 35420425Ssteve vp->func = NULL; 35517525Sache INTOFF; 3561556Srgrimes *vpp = vp; 35717525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 358171268Sscf change_env(s, 1); 35917525Sache (void) setlocale(LC_ALL, ""); 36017525Sache } 36117525Sache INTON; 3621556Srgrimes} 3631556Srgrimes 3641556Srgrimes 3651556Srgrimes 3661556Srgrimes/* 3671556Srgrimes * Process a linked list of variable assignments. 3681556Srgrimes */ 3691556Srgrimes 3701556Srgrimesvoid 37190111Simplistsetvar(struct strlist *list) 37290111Simp{ 3731556Srgrimes struct strlist *lp; 3741556Srgrimes 3751556Srgrimes INTOFF; 3761556Srgrimes for (lp = list ; lp ; lp = lp->next) { 3771556Srgrimes setvareq(savestr(lp->text), 0); 3781556Srgrimes } 3791556Srgrimes INTON; 3801556Srgrimes} 3811556Srgrimes 3821556Srgrimes 3831556Srgrimes 3841556Srgrimes/* 3851556Srgrimes * Find the value of a variable. Returns NULL if not set. 3861556Srgrimes */ 3871556Srgrimes 3881556Srgrimeschar * 38990111Simplookupvar(char *name) 39090111Simp{ 3911556Srgrimes struct var *v; 3921556Srgrimes 3931556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 3941556Srgrimes if (varequal(v->text, name)) { 3951556Srgrimes if (v->flags & VUNSET) 3961556Srgrimes return NULL; 3971556Srgrimes return strchr(v->text, '=') + 1; 3981556Srgrimes } 3991556Srgrimes } 4001556Srgrimes return NULL; 4011556Srgrimes} 4021556Srgrimes 4031556Srgrimes 4041556Srgrimes 4051556Srgrimes/* 4061556Srgrimes * Search the environment of a builtin command. If the second argument 4071556Srgrimes * is nonzero, return the value of a variable even if it hasn't been 4081556Srgrimes * exported. 4091556Srgrimes */ 4101556Srgrimes 4111556Srgrimeschar * 41290111Simpbltinlookup(char *name, int doall) 41317987Speter{ 4141556Srgrimes struct strlist *sp; 4151556Srgrimes struct var *v; 4161556Srgrimes 4171556Srgrimes for (sp = cmdenviron ; sp ; sp = sp->next) { 4181556Srgrimes if (varequal(sp->text, name)) 4191556Srgrimes return strchr(sp->text, '=') + 1; 4201556Srgrimes } 4211556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 4221556Srgrimes if (varequal(v->text, name)) { 42317987Speter if ((v->flags & VUNSET) 42417987Speter || (!doall && (v->flags & VEXPORT) == 0)) 4251556Srgrimes return NULL; 4261556Srgrimes return strchr(v->text, '=') + 1; 4271556Srgrimes } 4281556Srgrimes } 4291556Srgrimes return NULL; 4301556Srgrimes} 4311556Srgrimes 4321556Srgrimes 4331556Srgrimes 4341556Srgrimes/* 4351556Srgrimes * Generate a list of exported variables. This routine is used to construct 4361556Srgrimes * the third argument to execve when executing a program. 4371556Srgrimes */ 4381556Srgrimes 4391556Srgrimeschar ** 44090111Simpenvironment(void) 44190111Simp{ 4421556Srgrimes int nenv; 4431556Srgrimes struct var **vpp; 4441556Srgrimes struct var *vp; 4451556Srgrimes char **env, **ep; 4461556Srgrimes 4471556Srgrimes nenv = 0; 4481556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4491556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 4501556Srgrimes if (vp->flags & VEXPORT) 4511556Srgrimes nenv++; 4521556Srgrimes } 4531556Srgrimes ep = env = stalloc((nenv + 1) * sizeof *env); 4541556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4551556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 4561556Srgrimes if (vp->flags & VEXPORT) 4571556Srgrimes *ep++ = vp->text; 4581556Srgrimes } 4591556Srgrimes *ep = NULL; 4601556Srgrimes return env; 4611556Srgrimes} 4621556Srgrimes 4631556Srgrimes 4641556Srgrimes/* 4651556Srgrimes * Called when a shell procedure is invoked to clear out nonexported 4661556Srgrimes * variables. It is also necessary to reallocate variables of with 4671556Srgrimes * VSTACK set since these are currently allocated on the stack. 4681556Srgrimes */ 4691556Srgrimes 4701556Srgrimes#ifdef mkinit 471149016SstefanfMKINIT void shprocvar(void); 4721556Srgrimes 4731556SrgrimesSHELLPROC { 4741556Srgrimes shprocvar(); 4751556Srgrimes} 4761556Srgrimes#endif 4771556Srgrimes 4781556Srgrimesvoid 47990111Simpshprocvar(void) 48090111Simp{ 4811556Srgrimes struct var **vpp; 4821556Srgrimes struct var *vp, **prev; 4831556Srgrimes 4841556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4851556Srgrimes for (prev = vpp ; (vp = *prev) != NULL ; ) { 4861556Srgrimes if ((vp->flags & VEXPORT) == 0) { 4871556Srgrimes *prev = vp->next; 4881556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 4891556Srgrimes ckfree(vp->text); 4901556Srgrimes if ((vp->flags & VSTRFIXED) == 0) 4911556Srgrimes ckfree(vp); 4921556Srgrimes } else { 4931556Srgrimes if (vp->flags & VSTACK) { 4941556Srgrimes vp->text = savestr(vp->text); 4951556Srgrimes vp->flags &=~ VSTACK; 4961556Srgrimes } 4971556Srgrimes prev = &vp->next; 4981556Srgrimes } 4991556Srgrimes } 5001556Srgrimes } 5011556Srgrimes initvar(); 5021556Srgrimes} 5031556Srgrimes 5041556Srgrimes 505158145Sstefanfstatic int 506158145Sstefanfvar_compare(const void *a, const void *b) 507158145Sstefanf{ 508158145Sstefanf const char *const *sa, *const *sb; 5091556Srgrimes 510158145Sstefanf sa = a; 511158145Sstefanf sb = b; 512158145Sstefanf /* 513158145Sstefanf * This compares two var=value strings which creates a different 514158145Sstefanf * order from what you would probably expect. POSIX is somewhat 515158145Sstefanf * ambiguous on what should be sorted exactly. 516158145Sstefanf */ 517158145Sstefanf return strcoll(*sa, *sb); 518158145Sstefanf} 519158145Sstefanf 520158145Sstefanf 5211556Srgrimes/* 5221556Srgrimes * Command to list all variables which are set. Currently this command 5231556Srgrimes * is invoked from the set command when the set command is called without 5241556Srgrimes * any variables. 5251556Srgrimes */ 5261556Srgrimes 5271556Srgrimesint 52890111Simpshowvarscmd(int argc __unused, char **argv __unused) 52917987Speter{ 5301556Srgrimes struct var **vpp; 5311556Srgrimes struct var *vp; 53297915Stjr const char *s; 533158145Sstefanf const char **vars; 534158145Sstefanf int i, n; 5351556Srgrimes 536158145Sstefanf /* 537158145Sstefanf * POSIX requires us to sort the variables. 538158145Sstefanf */ 539158145Sstefanf n = 0; 540158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 541158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 542158145Sstefanf if (!(vp->flags & VUNSET)) 543158145Sstefanf n++; 5441556Srgrimes } 5451556Srgrimes } 546158145Sstefanf 547158145Sstefanf INTON; 548158145Sstefanf vars = ckmalloc(n * sizeof(*vars)); 549158145Sstefanf i = 0; 550158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 551158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 552158145Sstefanf if (!(vp->flags & VUNSET)) 553158145Sstefanf vars[i++] = vp->text; 554158145Sstefanf } 555158145Sstefanf } 556158145Sstefanf 557158145Sstefanf qsort(vars, n, sizeof(*vars), var_compare); 558158145Sstefanf for (i = 0; i < n; i++) { 559158145Sstefanf for (s = vars[i]; *s != '='; s++) 560158145Sstefanf out1c(*s); 561158145Sstefanf out1c('='); 562158145Sstefanf out1qstr(s + 1); 563158145Sstefanf out1c('\n'); 564158145Sstefanf } 565158145Sstefanf ckfree(vars); 566158145Sstefanf INTOFF; 567158145Sstefanf 5681556Srgrimes return 0; 5691556Srgrimes} 5701556Srgrimes 5711556Srgrimes 5721556Srgrimes 5731556Srgrimes/* 5741556Srgrimes * The export and readonly commands. 5751556Srgrimes */ 5761556Srgrimes 5771556Srgrimesint 57890111Simpexportcmd(int argc, char **argv) 57917987Speter{ 5801556Srgrimes struct var **vpp; 5811556Srgrimes struct var *vp; 5821556Srgrimes char *name; 5831556Srgrimes char *p; 58497914Stjr char *cmdname; 58597914Stjr int ch, values; 5861556Srgrimes int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; 5871556Srgrimes 58897914Stjr cmdname = argv[0]; 58997914Stjr optreset = optind = 1; 590100663Stjr opterr = 0; 59197914Stjr values = 0; 59297914Stjr while ((ch = getopt(argc, argv, "p")) != -1) { 59397914Stjr switch (ch) { 59497914Stjr case 'p': 59597914Stjr values = 1; 59697914Stjr break; 59797914Stjr case '?': 59897914Stjr default: 59997914Stjr error("unknown option: -%c", optopt); 60097914Stjr } 60197914Stjr } 60297914Stjr argc -= optind; 60397914Stjr argv += optind; 60497914Stjr 605149919Sstefanf if (values && argc != 0) 606149919Sstefanf error("-p requires no arguments"); 6071556Srgrimes listsetvar(cmdenviron); 60897914Stjr if (argc != 0) { 609149919Sstefanf while ((name = *argv++) != NULL) { 6101556Srgrimes if ((p = strchr(name, '=')) != NULL) { 6111556Srgrimes p++; 6121556Srgrimes } else { 6131556Srgrimes vpp = hashvar(name); 6141556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 6151556Srgrimes if (varequal(vp->text, name)) { 61690111Simp 6171556Srgrimes vp->flags |= flag; 61817525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 619171268Sscf change_env(vp->text, 1); 62017525Sache (void) setlocale(LC_ALL, ""); 62117525Sache } 6221556Srgrimes goto found; 6231556Srgrimes } 6241556Srgrimes } 6251556Srgrimes } 6261556Srgrimes setvar(name, p, flag); 6271556Srgrimesfound:; 6281556Srgrimes } 6291556Srgrimes } else { 6301556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 6311556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 6321556Srgrimes if (vp->flags & flag) { 63397914Stjr if (values) { 63497914Stjr out1str(cmdname); 63597914Stjr out1c(' '); 63697914Stjr } 6371556Srgrimes for (p = vp->text ; *p != '=' ; p++) 6381556Srgrimes out1c(*p); 63997914Stjr if (values && !(vp->flags & VUNSET)) { 64097914Stjr out1c('='); 64197914Stjr out1qstr(p + 1); 64297914Stjr } 6431556Srgrimes out1c('\n'); 6441556Srgrimes } 6451556Srgrimes } 6461556Srgrimes } 6471556Srgrimes } 6481556Srgrimes return 0; 6491556Srgrimes} 6501556Srgrimes 6511556Srgrimes 6521556Srgrimes/* 6531556Srgrimes * The "local" command. 6541556Srgrimes */ 6551556Srgrimes 65617987Speterint 65790111Simplocalcmd(int argc __unused, char **argv __unused) 65817987Speter{ 6591556Srgrimes char *name; 6601556Srgrimes 6611556Srgrimes if (! in_function()) 6621556Srgrimes error("Not in a function"); 6631556Srgrimes while ((name = *argptr++) != NULL) { 6641556Srgrimes mklocal(name); 6651556Srgrimes } 6661556Srgrimes return 0; 6671556Srgrimes} 6681556Srgrimes 6691556Srgrimes 6701556Srgrimes/* 6711556Srgrimes * Make a variable a local variable. When a variable is made local, it's 6721556Srgrimes * value and flags are saved in a localvar structure. The saved values 6731556Srgrimes * will be restored when the shell function returns. We handle the name 6741556Srgrimes * "-" as a special case. 6751556Srgrimes */ 6761556Srgrimes 6771556Srgrimesvoid 67890111Simpmklocal(char *name) 67990111Simp{ 6801556Srgrimes struct localvar *lvp; 6811556Srgrimes struct var **vpp; 6821556Srgrimes struct var *vp; 6831556Srgrimes 6841556Srgrimes INTOFF; 6851556Srgrimes lvp = ckmalloc(sizeof (struct localvar)); 6861556Srgrimes if (name[0] == '-' && name[1] == '\0') { 6871556Srgrimes lvp->text = ckmalloc(sizeof optlist); 68817987Speter memcpy(lvp->text, optlist, sizeof optlist); 6891556Srgrimes vp = NULL; 6901556Srgrimes } else { 6911556Srgrimes vpp = hashvar(name); 6921556Srgrimes for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next); 6931556Srgrimes if (vp == NULL) { 6941556Srgrimes if (strchr(name, '=')) 6951556Srgrimes setvareq(savestr(name), VSTRFIXED); 6961556Srgrimes else 6971556Srgrimes setvar(name, NULL, VSTRFIXED); 6981556Srgrimes vp = *vpp; /* the new variable */ 6991556Srgrimes lvp->text = NULL; 7001556Srgrimes lvp->flags = VUNSET; 7011556Srgrimes } else { 7021556Srgrimes lvp->text = vp->text; 7031556Srgrimes lvp->flags = vp->flags; 7041556Srgrimes vp->flags |= VSTRFIXED|VTEXTFIXED; 7051556Srgrimes if (strchr(name, '=')) 7061556Srgrimes setvareq(savestr(name), 0); 7071556Srgrimes } 7081556Srgrimes } 7091556Srgrimes lvp->vp = vp; 7101556Srgrimes lvp->next = localvars; 7111556Srgrimes localvars = lvp; 7121556Srgrimes INTON; 7131556Srgrimes} 7141556Srgrimes 7151556Srgrimes 7161556Srgrimes/* 7171556Srgrimes * Called after a function returns. 7181556Srgrimes */ 7191556Srgrimes 7201556Srgrimesvoid 72190111Simppoplocalvars(void) 72290111Simp{ 7231556Srgrimes struct localvar *lvp; 7241556Srgrimes struct var *vp; 7251556Srgrimes 7261556Srgrimes while ((lvp = localvars) != NULL) { 7271556Srgrimes localvars = lvp->next; 7281556Srgrimes vp = lvp->vp; 7291556Srgrimes if (vp == NULL) { /* $- saved */ 73017987Speter memcpy(optlist, lvp->text, sizeof optlist); 7311556Srgrimes ckfree(lvp->text); 7321556Srgrimes } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { 7331556Srgrimes (void)unsetvar(vp->text); 7341556Srgrimes } else { 7351556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 7361556Srgrimes ckfree(vp->text); 7371556Srgrimes vp->flags = lvp->flags; 7381556Srgrimes vp->text = lvp->text; 7391556Srgrimes } 7401556Srgrimes ckfree(lvp); 7411556Srgrimes } 7421556Srgrimes} 7431556Srgrimes 7441556Srgrimes 74517987Speterint 74690111Simpsetvarcmd(int argc, char **argv) 74717987Speter{ 7481556Srgrimes if (argc <= 2) 7491556Srgrimes return unsetcmd(argc, argv); 7501556Srgrimes else if (argc == 3) 7511556Srgrimes setvar(argv[1], argv[2], 0); 7521556Srgrimes else 7531556Srgrimes error("List assignment not implemented"); 7541556Srgrimes return 0; 7551556Srgrimes} 7561556Srgrimes 7571556Srgrimes 7581556Srgrimes/* 7591556Srgrimes * The unset builtin command. We unset the function before we unset the 7601556Srgrimes * variable to allow a function to be unset when there is a readonly variable 7611556Srgrimes * with the same name. 7621556Srgrimes */ 7631556Srgrimes 76417987Speterint 76590111Simpunsetcmd(int argc __unused, char **argv __unused) 76617987Speter{ 7671556Srgrimes char **ap; 7681556Srgrimes int i; 7691556Srgrimes int flg_func = 0; 7701556Srgrimes int flg_var = 0; 7711556Srgrimes int ret = 0; 7721556Srgrimes 7731556Srgrimes while ((i = nextopt("vf")) != '\0') { 7741556Srgrimes if (i == 'f') 7751556Srgrimes flg_func = 1; 7761556Srgrimes else 7771556Srgrimes flg_var = 1; 7781556Srgrimes } 7791556Srgrimes if (flg_func == 0 && flg_var == 0) 7801556Srgrimes flg_var = 1; 7818855Srgrimes 7821556Srgrimes for (ap = argptr; *ap ; ap++) { 7831556Srgrimes if (flg_func) 7841556Srgrimes ret |= unsetfunc(*ap); 7851556Srgrimes if (flg_var) 7861556Srgrimes ret |= unsetvar(*ap); 7871556Srgrimes } 7881556Srgrimes return ret; 7891556Srgrimes} 7901556Srgrimes 7911556Srgrimes 7921556Srgrimes/* 7931556Srgrimes * Unset the specified variable. 7941556Srgrimes */ 7951556Srgrimes 79620425Ssteveint 79790111Simpunsetvar(char *s) 79890111Simp{ 7991556Srgrimes struct var **vpp; 8001556Srgrimes struct var *vp; 8011556Srgrimes 8021556Srgrimes vpp = hashvar(s); 8031556Srgrimes for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { 8041556Srgrimes if (varequal(vp->text, s)) { 8051556Srgrimes if (vp->flags & VREADONLY) 8061556Srgrimes return (1); 8071556Srgrimes INTOFF; 8081556Srgrimes if (*(strchr(vp->text, '=') + 1) != '\0') 8091556Srgrimes setvar(s, nullstr, 0); 81017525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 811171268Sscf change_env(s, 0); 81217525Sache setlocale(LC_ALL, ""); 81317525Sache } 81420425Ssteve vp->flags &= ~VEXPORT; 8151556Srgrimes vp->flags |= VUNSET; 8161556Srgrimes if ((vp->flags & VSTRFIXED) == 0) { 8171556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 8181556Srgrimes ckfree(vp->text); 8191556Srgrimes *vpp = vp->next; 8201556Srgrimes ckfree(vp); 8211556Srgrimes } 8221556Srgrimes INTON; 8231556Srgrimes return (0); 8241556Srgrimes } 8251556Srgrimes } 8261556Srgrimes 827135856Sdes return (0); 8281556Srgrimes} 8291556Srgrimes 8301556Srgrimes 8311556Srgrimes 8321556Srgrimes/* 8331556Srgrimes * Find the appropriate entry in the hash table from the name. 8341556Srgrimes */ 8351556Srgrimes 8361556SrgrimesSTATIC struct var ** 83790111Simphashvar(char *p) 83890111Simp{ 8391556Srgrimes unsigned int hashval; 8401556Srgrimes 84120425Ssteve hashval = ((unsigned char) *p) << 4; 8421556Srgrimes while (*p && *p != '=') 84320425Ssteve hashval += (unsigned char) *p++; 8441556Srgrimes return &vartab[hashval % VTABSIZE]; 8451556Srgrimes} 8461556Srgrimes 8471556Srgrimes 8481556Srgrimes 8491556Srgrimes/* 8501556Srgrimes * Returns true if the two strings specify the same varable. The first 8511556Srgrimes * variable name is terminated by '='; the second may be terminated by 8521556Srgrimes * either '=' or '\0'. 8531556Srgrimes */ 8541556Srgrimes 8551556SrgrimesSTATIC int 85690111Simpvarequal(char *p, char *q) 85790111Simp{ 8581556Srgrimes while (*p == *q++) { 8591556Srgrimes if (*p++ == '=') 8601556Srgrimes return 1; 8611556Srgrimes } 8621556Srgrimes if (*p == '=' && *(q - 1) == '\0') 8631556Srgrimes return 1; 8641556Srgrimes return 0; 8651556Srgrimes} 866