var.c revision 90111
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 * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 351556Srgrimes */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836150Scharnier#if 0 3936150Scharnierstatic char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95"; 4036150Scharnier#endif 4136150Scharnierstatic const char rcsid[] = 4250471Speter "$FreeBSD: head/bin/sh/var.c 90111 2002-02-02 06:50:57Z imp $"; 431556Srgrimes#endif /* not lint */ 441556Srgrimes 4517987Speter#include <unistd.h> 4617987Speter#include <stdlib.h> 4717987Speter 481556Srgrimes/* 491556Srgrimes * Shell variables. 501556Srgrimes */ 511556Srgrimes 5217525Sache#include <locale.h> 5317525Sache 541556Srgrimes#include "shell.h" 551556Srgrimes#include "output.h" 561556Srgrimes#include "expand.h" 571556Srgrimes#include "nodes.h" /* for other headers */ 581556Srgrimes#include "eval.h" /* defines cmdenviron */ 591556Srgrimes#include "exec.h" 601556Srgrimes#include "syntax.h" 611556Srgrimes#include "options.h" 621556Srgrimes#include "mail.h" 631556Srgrimes#include "var.h" 641556Srgrimes#include "memalloc.h" 651556Srgrimes#include "error.h" 661556Srgrimes#include "mystring.h" 6720425Ssteve#include "parser.h" 6817987Speter#ifndef NO_HISTORY 6917987Speter#include "myhistedit.h" 7017987Speter#endif 711556Srgrimes 721556Srgrimes 731556Srgrimes#define VTABSIZE 39 741556Srgrimes 751556Srgrimes 761556Srgrimesstruct varinit { 771556Srgrimes struct var *var; 781556Srgrimes int flags; 791556Srgrimes char *text; 8090111Simp void (*func)(const char *); 811556Srgrimes}; 821556Srgrimes 831556Srgrimes 841556Srgrimes#if ATTY 851556Srgrimesstruct var vatty; 861556Srgrimes#endif 8717987Speter#ifndef NO_HISTORY 881556Srgrimesstruct var vhistsize; 8917987Speter#endif 901556Srgrimesstruct var vifs; 911556Srgrimesstruct var vmail; 921556Srgrimesstruct var vmpath; 931556Srgrimesstruct var vpath; 941556Srgrimesstruct var vps1; 951556Srgrimesstruct var vps2; 961556Srgrimesstruct var vvers; 971556Srgrimes#if ATTY 981556Srgrimesstruct var vterm; 991556Srgrimes#endif 10020425Sstevestruct var voptind; 1011556Srgrimes 1021556Srgrimesconst struct varinit varinit[] = { 1031556Srgrimes#if ATTY 10420425Ssteve { &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=", 10520425Ssteve NULL }, 1061556Srgrimes#endif 10717987Speter#ifndef NO_HISTORY 10820425Ssteve { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=", 10920425Ssteve sethistsize }, 11017987Speter#endif 11120425Ssteve { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n", 11220425Ssteve NULL }, 11320425Ssteve { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=", 11420425Ssteve NULL }, 11520425Ssteve { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=", 11620425Ssteve NULL }, 11720425Ssteve { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=/bin:/usr/bin", 11820425Ssteve changepath }, 1198855Srgrimes /* 1201556Srgrimes * vps1 depends on uid 1211556Srgrimes */ 12220425Ssteve { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ", 12320425Ssteve NULL }, 1241556Srgrimes#if ATTY 12520425Ssteve { &vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM=", 12620425Ssteve NULL }, 1271556Srgrimes#endif 12820425Ssteve { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1", 12920425Ssteve getoptsreset }, 13020425Ssteve { NULL, 0, NULL, 13120425Ssteve NULL } 1321556Srgrimes}; 1331556Srgrimes 1341556Srgrimesstruct var *vartab[VTABSIZE]; 1351556Srgrimes 13690111SimpSTATIC struct var **hashvar(char *); 13790111SimpSTATIC int varequal(char *, char *); 13890111SimpSTATIC int localevar(char *); 1391556Srgrimes 1401556Srgrimes/* 1411556Srgrimes * Initialize the varable symbol tables and import the environment 1421556Srgrimes */ 1431556Srgrimes 1441556Srgrimes#ifdef mkinit 1451556SrgrimesINCLUDE "var.h" 1461556SrgrimesINIT { 1471556Srgrimes char **envp; 1481556Srgrimes extern char **environ; 1491556Srgrimes 1501556Srgrimes initvar(); 1511556Srgrimes for (envp = environ ; *envp ; envp++) { 1521556Srgrimes if (strchr(*envp, '=')) { 1531556Srgrimes setvareq(*envp, VEXPORT|VTEXTFIXED); 1541556Srgrimes } 1551556Srgrimes } 1561556Srgrimes} 1571556Srgrimes#endif 1581556Srgrimes 1591556Srgrimes 1601556Srgrimes/* 1611556Srgrimes * This routine initializes the builtin variables. It is called when the 1621556Srgrimes * shell is initialized and again when a shell procedure is spawned. 1631556Srgrimes */ 1641556Srgrimes 1651556Srgrimesvoid 16690111Simpinitvar(void) 16790111Simp{ 1681556Srgrimes const struct varinit *ip; 1691556Srgrimes struct var *vp; 1701556Srgrimes struct var **vpp; 1711556Srgrimes 1721556Srgrimes for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { 1731556Srgrimes if ((vp->flags & VEXPORT) == 0) { 1741556Srgrimes vpp = hashvar(ip->text); 1751556Srgrimes vp->next = *vpp; 1761556Srgrimes *vpp = vp; 1771556Srgrimes vp->text = ip->text; 1781556Srgrimes vp->flags = ip->flags; 17920425Ssteve vp->func = ip->func; 1801556Srgrimes } 1811556Srgrimes } 1821556Srgrimes /* 1831556Srgrimes * PS1 depends on uid 1841556Srgrimes */ 1851556Srgrimes if ((vps1.flags & VEXPORT) == 0) { 1861556Srgrimes vpp = hashvar("PS1="); 1871556Srgrimes vps1.next = *vpp; 1881556Srgrimes *vpp = &vps1; 1891556Srgrimes vps1.text = geteuid() ? "PS1=$ " : "PS1=# "; 1901556Srgrimes vps1.flags = VSTRFIXED|VTEXTFIXED; 1911556Srgrimes } 1921556Srgrimes} 1931556Srgrimes 1941556Srgrimes/* 19520425Ssteve * Safe version of setvar, returns 1 on success 0 on failure. 19620425Ssteve */ 19720425Ssteve 19820425Ssteveint 19990111Simpsetvarsafe(char *name, char *val, int flags) 20020425Ssteve{ 20120425Ssteve struct jmploc jmploc; 20220425Ssteve struct jmploc *volatile savehandler = handler; 20320425Ssteve int err = 0; 20420425Ssteve#if __GNUC__ 20520425Ssteve /* Avoid longjmp clobbering */ 20620425Ssteve (void) &err; 20720425Ssteve#endif 20820425Ssteve 20920425Ssteve if (setjmp(jmploc.loc)) 21020425Ssteve err = 1; 21120425Ssteve else { 21220425Ssteve handler = &jmploc; 21320425Ssteve setvar(name, val, flags); 21420425Ssteve } 21520425Ssteve handler = savehandler; 21620425Ssteve return err; 21720425Ssteve} 21820425Ssteve 21920425Ssteve/* 22045621Scracauer * Set the value of a variable. The flags argument is tored with the 2211556Srgrimes * flags of the variable. If val is NULL, the variable is unset. 2221556Srgrimes */ 2231556Srgrimes 2241556Srgrimesvoid 22590111Simpsetvar(char *name, char *val, int flags) 22617987Speter{ 2271556Srgrimes char *p, *q; 2281556Srgrimes int len; 2291556Srgrimes int namelen; 2301556Srgrimes char *nameeq; 2311556Srgrimes int isbad; 2321556Srgrimes 2331556Srgrimes isbad = 0; 2341556Srgrimes p = name; 23517525Sache if (! is_name(*p)) 2361556Srgrimes isbad = 1; 23717525Sache p++; 2381556Srgrimes for (;;) { 2391556Srgrimes if (! is_in_name(*p)) { 2401556Srgrimes if (*p == '\0' || *p == '=') 2411556Srgrimes break; 2421556Srgrimes isbad = 1; 2431556Srgrimes } 2441556Srgrimes p++; 2451556Srgrimes } 2461556Srgrimes namelen = p - name; 2471556Srgrimes if (isbad) 2481556Srgrimes error("%.*s: bad variable name", namelen, name); 2491556Srgrimes len = namelen + 2; /* 2 is space for '=' and '\0' */ 2501556Srgrimes if (val == NULL) { 2511556Srgrimes flags |= VUNSET; 2521556Srgrimes } else { 2531556Srgrimes len += strlen(val); 2541556Srgrimes } 2551556Srgrimes p = nameeq = ckmalloc(len); 2561556Srgrimes q = name; 2571556Srgrimes while (--namelen >= 0) 2581556Srgrimes *p++ = *q++; 2591556Srgrimes *p++ = '='; 2601556Srgrimes *p = '\0'; 2611556Srgrimes if (val) 2621556Srgrimes scopy(val, p); 2631556Srgrimes setvareq(nameeq, flags); 2641556Srgrimes} 2651556Srgrimes 26617525SacheSTATIC int 26790111Simplocalevar(char *s) 26890111Simp{ 26917525Sache static char *lnames[7] = { 27017525Sache "ALL", "COLLATE", "CTYPE", "MONETARY", 27117525Sache "NUMERIC", "TIME", NULL 27217525Sache }; 27317525Sache char **ss; 2741556Srgrimes 27517525Sache if (*s != 'L') 27617525Sache return 0; 27717525Sache if (varequal(s + 1, "ANG")) 27817525Sache return 1; 27917525Sache if (strncmp(s + 1, "C_", 2) != 0) 28017525Sache return 0; 28117525Sache for (ss = lnames; *ss ; ss++) 28217525Sache if (varequal(s + 3, *ss)) 28317525Sache return 1; 28417525Sache return 0; 28517525Sache} 2861556Srgrimes 2871556Srgrimes/* 2881556Srgrimes * Same as setvar except that the variable and value are passed in 2891556Srgrimes * the first argument as name=value. Since the first argument will 2901556Srgrimes * be actually stored in the table, it should not be a string that 2911556Srgrimes * will go away. 2921556Srgrimes */ 2931556Srgrimes 2941556Srgrimesvoid 29590111Simpsetvareq(char *s, int flags) 29617987Speter{ 2971556Srgrimes struct var *vp, **vpp; 2981556Srgrimes 29945263Scracauer if (aflag) 30045263Scracauer flags |= VEXPORT; 3011556Srgrimes vpp = hashvar(s); 3021556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 3031556Srgrimes if (varequal(s, vp->text)) { 3041556Srgrimes if (vp->flags & VREADONLY) { 30520425Ssteve size_t len = strchr(s, '=') - s; 3061556Srgrimes error("%.*s: is read only", len, s); 3071556Srgrimes } 3081556Srgrimes INTOFF; 30920425Ssteve 31020425Ssteve if (vp->func && (flags & VNOFUNC) == 0) 31120425Ssteve (*vp->func)(strchr(s, '=') + 1); 31220425Ssteve 3131556Srgrimes if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) 3141556Srgrimes ckfree(vp->text); 31520425Ssteve 31620425Ssteve vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); 3171556Srgrimes vp->flags |= flags; 3181556Srgrimes vp->text = s; 31920425Ssteve 32020425Ssteve /* 32120425Ssteve * We could roll this to a function, to handle it as 32220425Ssteve * a regular variable function callback, but why bother? 32320425Ssteve */ 3241556Srgrimes if (vp == &vmpath || (vp == &vmail && ! mpathset())) 3251556Srgrimes chkmail(1); 32617525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 32717525Sache putenv(s); 32817525Sache (void) setlocale(LC_ALL, ""); 32917525Sache } 3301556Srgrimes INTON; 3311556Srgrimes return; 3321556Srgrimes } 3331556Srgrimes } 3341556Srgrimes /* not found */ 3351556Srgrimes vp = ckmalloc(sizeof (*vp)); 3361556Srgrimes vp->flags = flags; 3371556Srgrimes vp->text = s; 3381556Srgrimes vp->next = *vpp; 33920425Ssteve vp->func = NULL; 34017525Sache INTOFF; 3411556Srgrimes *vpp = vp; 34217525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 34317525Sache putenv(s); 34417525Sache (void) setlocale(LC_ALL, ""); 34517525Sache } 34617525Sache INTON; 3471556Srgrimes} 3481556Srgrimes 3491556Srgrimes 3501556Srgrimes 3511556Srgrimes/* 3521556Srgrimes * Process a linked list of variable assignments. 3531556Srgrimes */ 3541556Srgrimes 3551556Srgrimesvoid 35690111Simplistsetvar(struct strlist *list) 35790111Simp{ 3581556Srgrimes struct strlist *lp; 3591556Srgrimes 3601556Srgrimes INTOFF; 3611556Srgrimes for (lp = list ; lp ; lp = lp->next) { 3621556Srgrimes setvareq(savestr(lp->text), 0); 3631556Srgrimes } 3641556Srgrimes INTON; 3651556Srgrimes} 3661556Srgrimes 3671556Srgrimes 3681556Srgrimes 3691556Srgrimes/* 3701556Srgrimes * Find the value of a variable. Returns NULL if not set. 3711556Srgrimes */ 3721556Srgrimes 3731556Srgrimeschar * 37490111Simplookupvar(char *name) 37590111Simp{ 3761556Srgrimes struct var *v; 3771556Srgrimes 3781556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 3791556Srgrimes if (varequal(v->text, name)) { 3801556Srgrimes if (v->flags & VUNSET) 3811556Srgrimes return NULL; 3821556Srgrimes return strchr(v->text, '=') + 1; 3831556Srgrimes } 3841556Srgrimes } 3851556Srgrimes return NULL; 3861556Srgrimes} 3871556Srgrimes 3881556Srgrimes 3891556Srgrimes 3901556Srgrimes/* 3911556Srgrimes * Search the environment of a builtin command. If the second argument 3921556Srgrimes * is nonzero, return the value of a variable even if it hasn't been 3931556Srgrimes * exported. 3941556Srgrimes */ 3951556Srgrimes 3961556Srgrimeschar * 39790111Simpbltinlookup(char *name, int doall) 39817987Speter{ 3991556Srgrimes struct strlist *sp; 4001556Srgrimes struct var *v; 4011556Srgrimes 4021556Srgrimes for (sp = cmdenviron ; sp ; sp = sp->next) { 4031556Srgrimes if (varequal(sp->text, name)) 4041556Srgrimes return strchr(sp->text, '=') + 1; 4051556Srgrimes } 4061556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 4071556Srgrimes if (varequal(v->text, name)) { 40817987Speter if ((v->flags & VUNSET) 40917987Speter || (!doall && (v->flags & VEXPORT) == 0)) 4101556Srgrimes return NULL; 4111556Srgrimes return strchr(v->text, '=') + 1; 4121556Srgrimes } 4131556Srgrimes } 4141556Srgrimes return NULL; 4151556Srgrimes} 4161556Srgrimes 4171556Srgrimes 4181556Srgrimes 4191556Srgrimes/* 4201556Srgrimes * Generate a list of exported variables. This routine is used to construct 4211556Srgrimes * the third argument to execve when executing a program. 4221556Srgrimes */ 4231556Srgrimes 4241556Srgrimeschar ** 42590111Simpenvironment(void) 42690111Simp{ 4271556Srgrimes int nenv; 4281556Srgrimes struct var **vpp; 4291556Srgrimes struct var *vp; 4301556Srgrimes char **env, **ep; 4311556Srgrimes 4321556Srgrimes nenv = 0; 4331556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4341556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 4351556Srgrimes if (vp->flags & VEXPORT) 4361556Srgrimes nenv++; 4371556Srgrimes } 4381556Srgrimes ep = env = stalloc((nenv + 1) * sizeof *env); 4391556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4401556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 4411556Srgrimes if (vp->flags & VEXPORT) 4421556Srgrimes *ep++ = vp->text; 4431556Srgrimes } 4441556Srgrimes *ep = NULL; 4451556Srgrimes return env; 4461556Srgrimes} 4471556Srgrimes 4481556Srgrimes 4491556Srgrimes/* 4501556Srgrimes * Called when a shell procedure is invoked to clear out nonexported 4511556Srgrimes * variables. It is also necessary to reallocate variables of with 4521556Srgrimes * VSTACK set since these are currently allocated on the stack. 4531556Srgrimes */ 4541556Srgrimes 4551556Srgrimes#ifdef mkinit 4561556SrgrimesMKINIT void shprocvar(); 4571556Srgrimes 4581556SrgrimesSHELLPROC { 4591556Srgrimes shprocvar(); 4601556Srgrimes} 4611556Srgrimes#endif 4621556Srgrimes 4631556Srgrimesvoid 46490111Simpshprocvar(void) 46590111Simp{ 4661556Srgrimes struct var **vpp; 4671556Srgrimes struct var *vp, **prev; 4681556Srgrimes 4691556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 4701556Srgrimes for (prev = vpp ; (vp = *prev) != NULL ; ) { 4711556Srgrimes if ((vp->flags & VEXPORT) == 0) { 4721556Srgrimes *prev = vp->next; 4731556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 4741556Srgrimes ckfree(vp->text); 4751556Srgrimes if ((vp->flags & VSTRFIXED) == 0) 4761556Srgrimes ckfree(vp); 4771556Srgrimes } else { 4781556Srgrimes if (vp->flags & VSTACK) { 4791556Srgrimes vp->text = savestr(vp->text); 4801556Srgrimes vp->flags &=~ VSTACK; 4811556Srgrimes } 4821556Srgrimes prev = &vp->next; 4831556Srgrimes } 4841556Srgrimes } 4851556Srgrimes } 4861556Srgrimes initvar(); 4871556Srgrimes} 4881556Srgrimes 4891556Srgrimes 4901556Srgrimes 4911556Srgrimes/* 4921556Srgrimes * Command to list all variables which are set. Currently this command 4931556Srgrimes * is invoked from the set command when the set command is called without 4941556Srgrimes * any variables. 4951556Srgrimes */ 4961556Srgrimes 4971556Srgrimesint 49890111Simpshowvarscmd(int argc __unused, char **argv __unused) 49917987Speter{ 5001556Srgrimes struct var **vpp; 5011556Srgrimes struct var *vp; 5021556Srgrimes 5031556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5041556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 5051556Srgrimes if ((vp->flags & VUNSET) == 0) 5061556Srgrimes out1fmt("%s\n", vp->text); 5071556Srgrimes } 5081556Srgrimes } 5091556Srgrimes return 0; 5101556Srgrimes} 5111556Srgrimes 5121556Srgrimes 5131556Srgrimes 5141556Srgrimes/* 5151556Srgrimes * The export and readonly commands. 5161556Srgrimes */ 5171556Srgrimes 5181556Srgrimesint 51990111Simpexportcmd(int argc, char **argv) 52017987Speter{ 5211556Srgrimes struct var **vpp; 5221556Srgrimes struct var *vp; 5231556Srgrimes char *name; 5241556Srgrimes char *p; 5251556Srgrimes int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; 5261556Srgrimes 5271556Srgrimes listsetvar(cmdenviron); 5281556Srgrimes if (argc > 1) { 5291556Srgrimes while ((name = *argptr++) != NULL) { 5301556Srgrimes if ((p = strchr(name, '=')) != NULL) { 5311556Srgrimes p++; 5321556Srgrimes } else { 5331556Srgrimes vpp = hashvar(name); 5341556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 5351556Srgrimes if (varequal(vp->text, name)) { 53690111Simp 5371556Srgrimes vp->flags |= flag; 53817525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 53917525Sache putenv(vp->text); 54017525Sache (void) setlocale(LC_ALL, ""); 54117525Sache } 5421556Srgrimes goto found; 5431556Srgrimes } 5441556Srgrimes } 5451556Srgrimes } 5461556Srgrimes setvar(name, p, flag); 5471556Srgrimesfound:; 5481556Srgrimes } 5491556Srgrimes } else { 5501556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5511556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 5521556Srgrimes if (vp->flags & flag) { 5531556Srgrimes for (p = vp->text ; *p != '=' ; p++) 5541556Srgrimes out1c(*p); 5551556Srgrimes out1c('\n'); 5561556Srgrimes } 5571556Srgrimes } 5581556Srgrimes } 5591556Srgrimes } 5601556Srgrimes return 0; 5611556Srgrimes} 5621556Srgrimes 5631556Srgrimes 5641556Srgrimes/* 5651556Srgrimes * The "local" command. 5661556Srgrimes */ 5671556Srgrimes 56817987Speterint 56990111Simplocalcmd(int argc __unused, char **argv __unused) 57017987Speter{ 5711556Srgrimes char *name; 5721556Srgrimes 5731556Srgrimes if (! in_function()) 5741556Srgrimes error("Not in a function"); 5751556Srgrimes while ((name = *argptr++) != NULL) { 5761556Srgrimes mklocal(name); 5771556Srgrimes } 5781556Srgrimes return 0; 5791556Srgrimes} 5801556Srgrimes 5811556Srgrimes 5821556Srgrimes/* 5831556Srgrimes * Make a variable a local variable. When a variable is made local, it's 5841556Srgrimes * value and flags are saved in a localvar structure. The saved values 5851556Srgrimes * will be restored when the shell function returns. We handle the name 5861556Srgrimes * "-" as a special case. 5871556Srgrimes */ 5881556Srgrimes 5891556Srgrimesvoid 59090111Simpmklocal(char *name) 59190111Simp{ 5921556Srgrimes struct localvar *lvp; 5931556Srgrimes struct var **vpp; 5941556Srgrimes struct var *vp; 5951556Srgrimes 5961556Srgrimes INTOFF; 5971556Srgrimes lvp = ckmalloc(sizeof (struct localvar)); 5981556Srgrimes if (name[0] == '-' && name[1] == '\0') { 5991556Srgrimes lvp->text = ckmalloc(sizeof optlist); 60017987Speter memcpy(lvp->text, optlist, sizeof optlist); 6011556Srgrimes vp = NULL; 6021556Srgrimes } else { 6031556Srgrimes vpp = hashvar(name); 6041556Srgrimes for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next); 6051556Srgrimes if (vp == NULL) { 6061556Srgrimes if (strchr(name, '=')) 6071556Srgrimes setvareq(savestr(name), VSTRFIXED); 6081556Srgrimes else 6091556Srgrimes setvar(name, NULL, VSTRFIXED); 6101556Srgrimes vp = *vpp; /* the new variable */ 6111556Srgrimes lvp->text = NULL; 6121556Srgrimes lvp->flags = VUNSET; 6131556Srgrimes } else { 6141556Srgrimes lvp->text = vp->text; 6151556Srgrimes lvp->flags = vp->flags; 6161556Srgrimes vp->flags |= VSTRFIXED|VTEXTFIXED; 6171556Srgrimes if (strchr(name, '=')) 6181556Srgrimes setvareq(savestr(name), 0); 6191556Srgrimes } 6201556Srgrimes } 6211556Srgrimes lvp->vp = vp; 6221556Srgrimes lvp->next = localvars; 6231556Srgrimes localvars = lvp; 6241556Srgrimes INTON; 6251556Srgrimes} 6261556Srgrimes 6271556Srgrimes 6281556Srgrimes/* 6291556Srgrimes * Called after a function returns. 6301556Srgrimes */ 6311556Srgrimes 6321556Srgrimesvoid 63390111Simppoplocalvars(void) 63490111Simp{ 6351556Srgrimes struct localvar *lvp; 6361556Srgrimes struct var *vp; 6371556Srgrimes 6381556Srgrimes while ((lvp = localvars) != NULL) { 6391556Srgrimes localvars = lvp->next; 6401556Srgrimes vp = lvp->vp; 6411556Srgrimes if (vp == NULL) { /* $- saved */ 64217987Speter memcpy(optlist, lvp->text, sizeof optlist); 6431556Srgrimes ckfree(lvp->text); 6441556Srgrimes } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { 6451556Srgrimes (void)unsetvar(vp->text); 6461556Srgrimes } else { 6471556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 6481556Srgrimes ckfree(vp->text); 6491556Srgrimes vp->flags = lvp->flags; 6501556Srgrimes vp->text = lvp->text; 6511556Srgrimes } 6521556Srgrimes ckfree(lvp); 6531556Srgrimes } 6541556Srgrimes} 6551556Srgrimes 6561556Srgrimes 65717987Speterint 65890111Simpsetvarcmd(int argc, char **argv) 65917987Speter{ 6601556Srgrimes if (argc <= 2) 6611556Srgrimes return unsetcmd(argc, argv); 6621556Srgrimes else if (argc == 3) 6631556Srgrimes setvar(argv[1], argv[2], 0); 6641556Srgrimes else 6651556Srgrimes error("List assignment not implemented"); 6661556Srgrimes return 0; 6671556Srgrimes} 6681556Srgrimes 6691556Srgrimes 6701556Srgrimes/* 6711556Srgrimes * The unset builtin command. We unset the function before we unset the 6721556Srgrimes * variable to allow a function to be unset when there is a readonly variable 6731556Srgrimes * with the same name. 6741556Srgrimes */ 6751556Srgrimes 67617987Speterint 67790111Simpunsetcmd(int argc __unused, char **argv __unused) 67817987Speter{ 6791556Srgrimes char **ap; 6801556Srgrimes int i; 6811556Srgrimes int flg_func = 0; 6821556Srgrimes int flg_var = 0; 6831556Srgrimes int ret = 0; 6841556Srgrimes 6851556Srgrimes while ((i = nextopt("vf")) != '\0') { 6861556Srgrimes if (i == 'f') 6871556Srgrimes flg_func = 1; 6881556Srgrimes else 6891556Srgrimes flg_var = 1; 6901556Srgrimes } 6911556Srgrimes if (flg_func == 0 && flg_var == 0) 6921556Srgrimes flg_var = 1; 6938855Srgrimes 6941556Srgrimes for (ap = argptr; *ap ; ap++) { 6951556Srgrimes if (flg_func) 6961556Srgrimes ret |= unsetfunc(*ap); 6971556Srgrimes if (flg_var) 6981556Srgrimes ret |= unsetvar(*ap); 6991556Srgrimes } 7001556Srgrimes return ret; 7011556Srgrimes} 7021556Srgrimes 7031556Srgrimes 7041556Srgrimes/* 7051556Srgrimes * Unset the specified variable. 7061556Srgrimes */ 7071556Srgrimes 70820425Ssteveint 70990111Simpunsetvar(char *s) 71090111Simp{ 7111556Srgrimes struct var **vpp; 7121556Srgrimes struct var *vp; 7131556Srgrimes 7141556Srgrimes vpp = hashvar(s); 7151556Srgrimes for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { 7161556Srgrimes if (varequal(vp->text, s)) { 7171556Srgrimes if (vp->flags & VREADONLY) 7181556Srgrimes return (1); 7191556Srgrimes INTOFF; 7201556Srgrimes if (*(strchr(vp->text, '=') + 1) != '\0') 7211556Srgrimes setvar(s, nullstr, 0); 72217525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 72317525Sache unsetenv(s); 72417525Sache setlocale(LC_ALL, ""); 72517525Sache } 72620425Ssteve vp->flags &= ~VEXPORT; 7271556Srgrimes vp->flags |= VUNSET; 7281556Srgrimes if ((vp->flags & VSTRFIXED) == 0) { 7291556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 7301556Srgrimes ckfree(vp->text); 7311556Srgrimes *vpp = vp->next; 7321556Srgrimes ckfree(vp); 7331556Srgrimes } 7341556Srgrimes INTON; 7351556Srgrimes return (0); 7361556Srgrimes } 7371556Srgrimes } 7381556Srgrimes 7391556Srgrimes return (1); 7401556Srgrimes} 7411556Srgrimes 7421556Srgrimes 7431556Srgrimes 7441556Srgrimes/* 7451556Srgrimes * Find the appropriate entry in the hash table from the name. 7461556Srgrimes */ 7471556Srgrimes 7481556SrgrimesSTATIC struct var ** 74990111Simphashvar(char *p) 75090111Simp{ 7511556Srgrimes unsigned int hashval; 7521556Srgrimes 75320425Ssteve hashval = ((unsigned char) *p) << 4; 7541556Srgrimes while (*p && *p != '=') 75520425Ssteve hashval += (unsigned char) *p++; 7561556Srgrimes return &vartab[hashval % VTABSIZE]; 7571556Srgrimes} 7581556Srgrimes 7591556Srgrimes 7601556Srgrimes 7611556Srgrimes/* 7621556Srgrimes * Returns true if the two strings specify the same varable. The first 7631556Srgrimes * variable name is terminated by '='; the second may be terminated by 7641556Srgrimes * either '=' or '\0'. 7651556Srgrimes */ 7661556Srgrimes 7671556SrgrimesSTATIC int 76890111Simpvarequal(char *p, char *q) 76990111Simp{ 7701556Srgrimes while (*p == *q++) { 7711556Srgrimes if (*p++ == '=') 7721556Srgrimes return 1; 7731556Srgrimes } 7741556Srgrimes if (*p == '=' && *(q - 1) == '\0') 7751556Srgrimes return 1; 7761556Srgrimes return 0; 7771556Srgrimes} 778