var.c revision 212467
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 212467 2010-09-11 14:15:50Z 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; 76201056Sjilles const char *text; 7790111Simp void (*func)(const char *); 781556Srgrimes}; 791556Srgrimes 801556Srgrimes 8117987Speter#ifndef NO_HISTORY 821556Srgrimesstruct var vhistsize; 83208755Sjillesstruct var vterm; 8417987Speter#endif 851556Srgrimesstruct var vifs; 861556Srgrimesstruct var vmail; 871556Srgrimesstruct var vmpath; 881556Srgrimesstruct var vpath; 8997689Stjrstruct var vppid; 901556Srgrimesstruct var vps1; 911556Srgrimesstruct var vps2; 92159632Sstefanfstruct var vps4; 931556Srgrimesstruct var vvers; 94117261SddsSTATIC struct var voptind; 951556Srgrimes 96117261SddsSTATIC const struct varinit varinit[] = { 9717987Speter#ifndef NO_HISTORY 98201056Sjilles { &vhistsize, VUNSET, "HISTSIZE=", 9920425Ssteve sethistsize }, 10017987Speter#endif 101201056Sjilles { &vifs, 0, "IFS= \t\n", 10220425Ssteve NULL }, 103201056Sjilles { &vmail, VUNSET, "MAIL=", 10420425Ssteve NULL }, 105201056Sjilles { &vmpath, VUNSET, "MAILPATH=", 10620425Ssteve NULL }, 107201056Sjilles { &vpath, 0, "PATH=" _PATH_DEFPATH, 10820425Ssteve changepath }, 109201056Sjilles { &vppid, VUNSET, "PPID=", 11097689Stjr NULL }, 1118855Srgrimes /* 1121556Srgrimes * vps1 depends on uid 1131556Srgrimes */ 114201056Sjilles { &vps2, 0, "PS2=> ", 11520425Ssteve NULL }, 116201056Sjilles { &vps4, 0, "PS4=+ ", 117159632Sstefanf NULL }, 118208755Sjilles#ifndef NO_HISTORY 119208755Sjilles { &vterm, VUNSET, "TERM=", 120208755Sjilles setterm }, 121208755Sjilles#endif 122201056Sjilles { &voptind, 0, "OPTIND=1", 12320425Ssteve getoptsreset }, 12420425Ssteve { NULL, 0, NULL, 12520425Ssteve NULL } 1261556Srgrimes}; 1271556Srgrimes 128117261SddsSTATIC struct var *vartab[VTABSIZE]; 1291556Srgrimes 130207678SjillesSTATIC const char *const locale_names[7] = { 131207678Sjilles "LC_COLLATE", "LC_CTYPE", "LC_MONETARY", 132207678Sjilles "LC_NUMERIC", "LC_TIME", "LC_MESSAGES", NULL 133207678Sjilles}; 134207678SjillesSTATIC const int locale_categories[7] = { 135207678Sjilles LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME, LC_MESSAGES, 0 136207678Sjilles}; 137207678Sjilles 138200956SjillesSTATIC struct var **hashvar(const char *); 139200956SjillesSTATIC int varequal(const char *, const char *); 140200956SjillesSTATIC int localevar(const char *); 1411556Srgrimes 1421556Srgrimes/* 143155302Sschweikh * Initialize the variable symbol tables and import the environment. 1441556Srgrimes */ 1451556Srgrimes 1461556Srgrimes#ifdef mkinit 1471556SrgrimesINCLUDE "var.h" 148201053SjillesMKINIT char **environ; 1491556SrgrimesINIT { 1501556Srgrimes char **envp; 1511556Srgrimes 1521556Srgrimes initvar(); 1531556Srgrimes for (envp = environ ; *envp ; envp++) { 1541556Srgrimes if (strchr(*envp, '=')) { 1551556Srgrimes setvareq(*envp, VEXPORT|VTEXTFIXED); 1561556Srgrimes } 1571556Srgrimes } 1581556Srgrimes} 1591556Srgrimes#endif 1601556Srgrimes 1611556Srgrimes 1621556Srgrimes/* 1631556Srgrimes * This routine initializes the builtin variables. It is called when the 1641556Srgrimes * shell is initialized and again when a shell procedure is spawned. 1651556Srgrimes */ 1661556Srgrimes 1671556Srgrimesvoid 16890111Simpinitvar(void) 16990111Simp{ 17097689Stjr char ppid[20]; 1711556Srgrimes const struct varinit *ip; 1721556Srgrimes struct var *vp; 1731556Srgrimes struct var **vpp; 1741556Srgrimes 1751556Srgrimes for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { 1761556Srgrimes if ((vp->flags & VEXPORT) == 0) { 1771556Srgrimes vpp = hashvar(ip->text); 1781556Srgrimes vp->next = *vpp; 1791556Srgrimes *vpp = vp; 180201056Sjilles vp->text = __DECONST(char *, ip->text); 181201056Sjilles vp->flags = ip->flags | VSTRFIXED | VTEXTFIXED; 18220425Ssteve vp->func = ip->func; 1831556Srgrimes } 1841556Srgrimes } 1851556Srgrimes /* 1861556Srgrimes * PS1 depends on uid 1871556Srgrimes */ 1881556Srgrimes if ((vps1.flags & VEXPORT) == 0) { 1891556Srgrimes vpp = hashvar("PS1="); 1901556Srgrimes vps1.next = *vpp; 1911556Srgrimes *vpp = &vps1; 192201056Sjilles vps1.text = __DECONST(char *, geteuid() ? "PS1=$ " : "PS1=# "); 1931556Srgrimes vps1.flags = VSTRFIXED|VTEXTFIXED; 1941556Srgrimes } 19597689Stjr if ((vppid.flags & VEXPORT) == 0) { 19697689Stjr fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); 19797689Stjr setvarsafe("PPID", ppid, 0); 19897689Stjr } 1991556Srgrimes} 2001556Srgrimes 2011556Srgrimes/* 20220425Ssteve * Safe version of setvar, returns 1 on success 0 on failure. 20320425Ssteve */ 20420425Ssteve 20520425Ssteveint 206200956Sjillessetvarsafe(const char *name, const char *val, int flags) 20720425Ssteve{ 20820425Ssteve struct jmploc jmploc; 209194765Sjilles struct jmploc *const savehandler = handler; 21020425Ssteve int err = 0; 211199660Sjilles int inton; 21220425Ssteve 213199660Sjilles inton = is_int_on(); 21420425Ssteve if (setjmp(jmploc.loc)) 21520425Ssteve err = 1; 21620425Ssteve else { 21720425Ssteve handler = &jmploc; 21820425Ssteve setvar(name, val, flags); 21920425Ssteve } 22020425Ssteve handler = savehandler; 221199660Sjilles SETINTON(inton); 22220425Ssteve return err; 22320425Ssteve} 22420425Ssteve 22520425Ssteve/* 226155302Sschweikh * Set the value of a variable. The flags argument is stored with the 2271556Srgrimes * flags of the variable. If val is NULL, the variable is unset. 2281556Srgrimes */ 2291556Srgrimes 2301556Srgrimesvoid 231200956Sjillessetvar(const char *name, const char *val, int flags) 23217987Speter{ 233200956Sjilles const char *p; 2341556Srgrimes int len; 2351556Srgrimes int namelen; 2361556Srgrimes char *nameeq; 2371556Srgrimes int isbad; 2381556Srgrimes 2391556Srgrimes isbad = 0; 2401556Srgrimes p = name; 24117525Sache if (! is_name(*p)) 2421556Srgrimes isbad = 1; 24317525Sache p++; 2441556Srgrimes for (;;) { 2451556Srgrimes if (! is_in_name(*p)) { 2461556Srgrimes if (*p == '\0' || *p == '=') 2471556Srgrimes break; 2481556Srgrimes isbad = 1; 2491556Srgrimes } 2501556Srgrimes p++; 2511556Srgrimes } 2521556Srgrimes namelen = p - name; 2531556Srgrimes if (isbad) 2541556Srgrimes error("%.*s: bad variable name", namelen, name); 2551556Srgrimes len = namelen + 2; /* 2 is space for '=' and '\0' */ 2561556Srgrimes if (val == NULL) { 2571556Srgrimes flags |= VUNSET; 2581556Srgrimes } else { 2591556Srgrimes len += strlen(val); 2601556Srgrimes } 261200956Sjilles nameeq = ckmalloc(len); 262200956Sjilles memcpy(nameeq, name, namelen); 263200956Sjilles nameeq[namelen] = '='; 2641556Srgrimes if (val) 265200956Sjilles scopy(val, nameeq + namelen + 1); 266200956Sjilles else 267200956Sjilles nameeq[namelen + 1] = '\0'; 2681556Srgrimes setvareq(nameeq, flags); 2691556Srgrimes} 2701556Srgrimes 27117525SacheSTATIC int 272200956Sjilleslocalevar(const char *s) 27390111Simp{ 274207678Sjilles const char *const *ss; 2751556Srgrimes 27617525Sache if (*s != 'L') 27717525Sache return 0; 27817525Sache if (varequal(s + 1, "ANG")) 27917525Sache return 1; 28017525Sache if (strncmp(s + 1, "C_", 2) != 0) 28117525Sache return 0; 282207678Sjilles if (varequal(s + 3, "ALL")) 283207678Sjilles return 1; 284207678Sjilles for (ss = locale_names; *ss ; ss++) 285207678Sjilles if (varequal(s + 3, *ss + 3)) 28617525Sache return 1; 28717525Sache return 0; 28817525Sache} 2891556Srgrimes 290171268Sscf 2911556Srgrimes/* 292171268Sscf * Sets/unsets an environment variable from a pointer that may actually be a 293171268Sscf * pointer into environ where the string should not be manipulated. 294171268Sscf */ 295171268Sscfstatic void 296200956Sjilleschange_env(const char *s, int set) 297171268Sscf{ 298171268Sscf char *eqp; 299171268Sscf char *ss; 300171268Sscf 301171268Sscf ss = savestr(s); 302171268Sscf if ((eqp = strchr(ss, '=')) != NULL) 303171268Sscf *eqp = '\0'; 304171268Sscf if (set && eqp != NULL) 305171268Sscf (void) setenv(ss, eqp + 1, 1); 306171268Sscf else 307171268Sscf (void) unsetenv(ss); 308171268Sscf ckfree(ss); 309171268Sscf 310171268Sscf return; 311171268Sscf} 312171268Sscf 313171268Sscf 314171268Sscf/* 3151556Srgrimes * Same as setvar except that the variable and value are passed in 3161556Srgrimes * the first argument as name=value. Since the first argument will 3171556Srgrimes * be actually stored in the table, it should not be a string that 3181556Srgrimes * will go away. 3191556Srgrimes */ 3201556Srgrimes 3211556Srgrimesvoid 32290111Simpsetvareq(char *s, int flags) 32317987Speter{ 3241556Srgrimes struct var *vp, **vpp; 32590112Simp int len; 3261556Srgrimes 32745263Scracauer if (aflag) 32845263Scracauer flags |= VEXPORT; 3291556Srgrimes vpp = hashvar(s); 3301556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 3311556Srgrimes if (varequal(s, vp->text)) { 3321556Srgrimes if (vp->flags & VREADONLY) { 33390112Simp len = strchr(s, '=') - s; 3341556Srgrimes error("%.*s: is read only", len, s); 3351556Srgrimes } 3361556Srgrimes INTOFF; 33720425Ssteve 33820425Ssteve if (vp->func && (flags & VNOFUNC) == 0) 33920425Ssteve (*vp->func)(strchr(s, '=') + 1); 34020425Ssteve 3411556Srgrimes if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) 3421556Srgrimes ckfree(vp->text); 34320425Ssteve 34420425Ssteve vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); 3451556Srgrimes vp->flags |= flags; 3461556Srgrimes vp->text = s; 34720425Ssteve 34820425Ssteve /* 34920425Ssteve * We could roll this to a function, to handle it as 35020425Ssteve * a regular variable function callback, but why bother? 351203576Sjilles * 352203576Sjilles * Note: this assumes iflag is not set to 1 initially. 353203576Sjilles * As part of init(), this is called before arguments 354203576Sjilles * are looked at. 35520425Ssteve */ 356203576Sjilles if ((vp == &vmpath || (vp == &vmail && ! mpathset())) && 357203576Sjilles iflag == 1) 3581556Srgrimes chkmail(1); 35917525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 360171268Sscf change_env(s, 1); 36117525Sache (void) setlocale(LC_ALL, ""); 36217525Sache } 3631556Srgrimes INTON; 3641556Srgrimes return; 3651556Srgrimes } 3661556Srgrimes } 3671556Srgrimes /* not found */ 3681556Srgrimes vp = ckmalloc(sizeof (*vp)); 3691556Srgrimes vp->flags = flags; 3701556Srgrimes vp->text = s; 3711556Srgrimes vp->next = *vpp; 37220425Ssteve vp->func = NULL; 37317525Sache INTOFF; 3741556Srgrimes *vpp = vp; 37517525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 376171268Sscf change_env(s, 1); 37717525Sache (void) setlocale(LC_ALL, ""); 37817525Sache } 37917525Sache INTON; 3801556Srgrimes} 3811556Srgrimes 3821556Srgrimes 3831556Srgrimes 3841556Srgrimes/* 3851556Srgrimes * Process a linked list of variable assignments. 3861556Srgrimes */ 3871556Srgrimes 3881556Srgrimesvoid 38990111Simplistsetvar(struct strlist *list) 39090111Simp{ 3911556Srgrimes struct strlist *lp; 3921556Srgrimes 3931556Srgrimes INTOFF; 3941556Srgrimes for (lp = list ; lp ; lp = lp->next) { 3951556Srgrimes setvareq(savestr(lp->text), 0); 3961556Srgrimes } 3971556Srgrimes INTON; 3981556Srgrimes} 3991556Srgrimes 4001556Srgrimes 4011556Srgrimes 4021556Srgrimes/* 4031556Srgrimes * Find the value of a variable. Returns NULL if not set. 4041556Srgrimes */ 4051556Srgrimes 4061556Srgrimeschar * 407200956Sjilleslookupvar(const char *name) 40890111Simp{ 4091556Srgrimes struct var *v; 4101556Srgrimes 4111556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 4121556Srgrimes if (varequal(v->text, name)) { 4131556Srgrimes if (v->flags & VUNSET) 4141556Srgrimes return NULL; 4151556Srgrimes return strchr(v->text, '=') + 1; 4161556Srgrimes } 4171556Srgrimes } 4181556Srgrimes return NULL; 4191556Srgrimes} 4201556Srgrimes 4211556Srgrimes 4221556Srgrimes 4231556Srgrimes/* 4241556Srgrimes * Search the environment of a builtin command. If the second argument 4251556Srgrimes * is nonzero, return the value of a variable even if it hasn't been 4261556Srgrimes * exported. 4271556Srgrimes */ 4281556Srgrimes 4291556Srgrimeschar * 430200956Sjillesbltinlookup(const char *name, int doall) 43117987Speter{ 4321556Srgrimes struct strlist *sp; 4331556Srgrimes struct var *v; 434212467Sjilles char *result; 4351556Srgrimes 436212467Sjilles result = NULL; 4371556Srgrimes for (sp = cmdenviron ; sp ; sp = sp->next) { 4381556Srgrimes if (varequal(sp->text, name)) 439212467Sjilles result = strchr(sp->text, '=') + 1; 4401556Srgrimes } 441212467Sjilles if (result != NULL) 442212467Sjilles return result; 4431556Srgrimes for (v = *hashvar(name) ; v ; v = v->next) { 4441556Srgrimes if (varequal(v->text, name)) { 44517987Speter if ((v->flags & VUNSET) 44617987Speter || (!doall && (v->flags & VEXPORT) == 0)) 4471556Srgrimes return NULL; 4481556Srgrimes return strchr(v->text, '=') + 1; 4491556Srgrimes } 4501556Srgrimes } 4511556Srgrimes return NULL; 4521556Srgrimes} 4531556Srgrimes 4541556Srgrimes 455207678Sjilles/* 456207678Sjilles * Set up locale for a builtin (LANG/LC_* assignments). 457207678Sjilles */ 458207678Sjillesvoid 459207678Sjillesbltinsetlocale(void) 460207678Sjilles{ 461207678Sjilles struct strlist *lp; 462207678Sjilles int act = 0; 463207678Sjilles char *loc, *locdef; 464207678Sjilles int i; 4651556Srgrimes 466207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 467207678Sjilles if (localevar(lp->text)) { 468207678Sjilles act = 1; 469207678Sjilles break; 470207678Sjilles } 471207678Sjilles } 472207678Sjilles if (!act) 473207678Sjilles return; 474207678Sjilles loc = bltinlookup("LC_ALL", 0); 475207678Sjilles INTOFF; 476207678Sjilles if (loc != NULL) { 477207678Sjilles setlocale(LC_ALL, loc); 478207678Sjilles INTON; 479207678Sjilles return; 480207678Sjilles } 481207678Sjilles locdef = bltinlookup("LANG", 0); 482207678Sjilles for (i = 0; locale_names[i] != NULL; i++) { 483207678Sjilles loc = bltinlookup(locale_names[i], 0); 484207678Sjilles if (loc == NULL) 485207678Sjilles loc = locdef; 486207678Sjilles if (loc != NULL) 487207678Sjilles setlocale(locale_categories[i], loc); 488207678Sjilles } 489207678Sjilles INTON; 490207678Sjilles} 491207678Sjilles 4921556Srgrimes/* 493207678Sjilles * Undo the effect of bltinlocaleset(). 494207678Sjilles */ 495207678Sjillesvoid 496207678Sjillesbltinunsetlocale(void) 497207678Sjilles{ 498207678Sjilles struct strlist *lp; 499207678Sjilles 500207678Sjilles INTOFF; 501207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 502207678Sjilles if (localevar(lp->text)) { 503207678Sjilles setlocale(LC_ALL, ""); 504207678Sjilles return; 505207678Sjilles } 506207678Sjilles } 507207678Sjilles INTON; 508207678Sjilles} 509207678Sjilles 510207678Sjilles 511207678Sjilles/* 5121556Srgrimes * Generate a list of exported variables. This routine is used to construct 5131556Srgrimes * the third argument to execve when executing a program. 5141556Srgrimes */ 5151556Srgrimes 5161556Srgrimeschar ** 51790111Simpenvironment(void) 51890111Simp{ 5191556Srgrimes int nenv; 5201556Srgrimes struct var **vpp; 5211556Srgrimes struct var *vp; 5221556Srgrimes char **env, **ep; 5231556Srgrimes 5241556Srgrimes nenv = 0; 5251556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5261556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5271556Srgrimes if (vp->flags & VEXPORT) 5281556Srgrimes nenv++; 5291556Srgrimes } 5301556Srgrimes ep = env = stalloc((nenv + 1) * sizeof *env); 5311556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5321556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5331556Srgrimes if (vp->flags & VEXPORT) 5341556Srgrimes *ep++ = vp->text; 5351556Srgrimes } 5361556Srgrimes *ep = NULL; 5371556Srgrimes return env; 5381556Srgrimes} 5391556Srgrimes 5401556Srgrimes 5411556Srgrimes/* 5421556Srgrimes * Called when a shell procedure is invoked to clear out nonexported 5431556Srgrimes * variables. It is also necessary to reallocate variables of with 5441556Srgrimes * VSTACK set since these are currently allocated on the stack. 5451556Srgrimes */ 5461556Srgrimes 547149016SstefanfMKINIT void shprocvar(void); 5481556Srgrimes 549201053Sjilles#ifdef mkinit 5501556SrgrimesSHELLPROC { 5511556Srgrimes shprocvar(); 5521556Srgrimes} 5531556Srgrimes#endif 5541556Srgrimes 5551556Srgrimesvoid 55690111Simpshprocvar(void) 55790111Simp{ 5581556Srgrimes struct var **vpp; 5591556Srgrimes struct var *vp, **prev; 5601556Srgrimes 5611556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5621556Srgrimes for (prev = vpp ; (vp = *prev) != NULL ; ) { 5631556Srgrimes if ((vp->flags & VEXPORT) == 0) { 5641556Srgrimes *prev = vp->next; 5651556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 5661556Srgrimes ckfree(vp->text); 5671556Srgrimes if ((vp->flags & VSTRFIXED) == 0) 5681556Srgrimes ckfree(vp); 5691556Srgrimes } else { 5701556Srgrimes if (vp->flags & VSTACK) { 5711556Srgrimes vp->text = savestr(vp->text); 5721556Srgrimes vp->flags &=~ VSTACK; 5731556Srgrimes } 5741556Srgrimes prev = &vp->next; 5751556Srgrimes } 5761556Srgrimes } 5771556Srgrimes } 5781556Srgrimes initvar(); 5791556Srgrimes} 5801556Srgrimes 5811556Srgrimes 582158145Sstefanfstatic int 583158145Sstefanfvar_compare(const void *a, const void *b) 584158145Sstefanf{ 585158145Sstefanf const char *const *sa, *const *sb; 5861556Srgrimes 587158145Sstefanf sa = a; 588158145Sstefanf sb = b; 589158145Sstefanf /* 590158145Sstefanf * This compares two var=value strings which creates a different 591158145Sstefanf * order from what you would probably expect. POSIX is somewhat 592158145Sstefanf * ambiguous on what should be sorted exactly. 593158145Sstefanf */ 594158145Sstefanf return strcoll(*sa, *sb); 595158145Sstefanf} 596158145Sstefanf 597158145Sstefanf 5981556Srgrimes/* 5991556Srgrimes * Command to list all variables which are set. Currently this command 6001556Srgrimes * is invoked from the set command when the set command is called without 6011556Srgrimes * any variables. 6021556Srgrimes */ 6031556Srgrimes 6041556Srgrimesint 60590111Simpshowvarscmd(int argc __unused, char **argv __unused) 60617987Speter{ 6071556Srgrimes struct var **vpp; 6081556Srgrimes struct var *vp; 60997915Stjr const char *s; 610158145Sstefanf const char **vars; 611158145Sstefanf int i, n; 6121556Srgrimes 613158145Sstefanf /* 614158145Sstefanf * POSIX requires us to sort the variables. 615158145Sstefanf */ 616158145Sstefanf n = 0; 617158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 618158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 619158145Sstefanf if (!(vp->flags & VUNSET)) 620158145Sstefanf n++; 6211556Srgrimes } 6221556Srgrimes } 623158145Sstefanf 624158145Sstefanf INTON; 625158145Sstefanf vars = ckmalloc(n * sizeof(*vars)); 626158145Sstefanf i = 0; 627158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 628158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 629158145Sstefanf if (!(vp->flags & VUNSET)) 630158145Sstefanf vars[i++] = vp->text; 631158145Sstefanf } 632158145Sstefanf } 633158145Sstefanf 634158145Sstefanf qsort(vars, n, sizeof(*vars), var_compare); 635158145Sstefanf for (i = 0; i < n; i++) { 636158145Sstefanf for (s = vars[i]; *s != '='; s++) 637158145Sstefanf out1c(*s); 638158145Sstefanf out1c('='); 639158145Sstefanf out1qstr(s + 1); 640158145Sstefanf out1c('\n'); 641158145Sstefanf } 642158145Sstefanf ckfree(vars); 643158145Sstefanf INTOFF; 644158145Sstefanf 6451556Srgrimes return 0; 6461556Srgrimes} 6471556Srgrimes 6481556Srgrimes 6491556Srgrimes 6501556Srgrimes/* 6511556Srgrimes * The export and readonly commands. 6521556Srgrimes */ 6531556Srgrimes 6541556Srgrimesint 65590111Simpexportcmd(int argc, char **argv) 65617987Speter{ 6571556Srgrimes struct var **vpp; 6581556Srgrimes struct var *vp; 6591556Srgrimes char *name; 6601556Srgrimes char *p; 66197914Stjr char *cmdname; 66297914Stjr int ch, values; 6631556Srgrimes int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; 6641556Srgrimes 66597914Stjr cmdname = argv[0]; 66697914Stjr optreset = optind = 1; 667100663Stjr opterr = 0; 66897914Stjr values = 0; 66997914Stjr while ((ch = getopt(argc, argv, "p")) != -1) { 67097914Stjr switch (ch) { 67197914Stjr case 'p': 67297914Stjr values = 1; 67397914Stjr break; 67497914Stjr case '?': 67597914Stjr default: 67697914Stjr error("unknown option: -%c", optopt); 67797914Stjr } 67897914Stjr } 67997914Stjr argc -= optind; 68097914Stjr argv += optind; 68197914Stjr 682149919Sstefanf if (values && argc != 0) 683149919Sstefanf error("-p requires no arguments"); 68497914Stjr if (argc != 0) { 685149919Sstefanf while ((name = *argv++) != NULL) { 6861556Srgrimes if ((p = strchr(name, '=')) != NULL) { 6871556Srgrimes p++; 6881556Srgrimes } else { 6891556Srgrimes vpp = hashvar(name); 6901556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 6911556Srgrimes if (varequal(vp->text, name)) { 69290111Simp 6931556Srgrimes vp->flags |= flag; 69417525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 695171268Sscf change_env(vp->text, 1); 69617525Sache (void) setlocale(LC_ALL, ""); 69717525Sache } 6981556Srgrimes goto found; 6991556Srgrimes } 7001556Srgrimes } 7011556Srgrimes } 7021556Srgrimes setvar(name, p, flag); 7031556Srgrimesfound:; 7041556Srgrimes } 7051556Srgrimes } else { 7061556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 7071556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 7081556Srgrimes if (vp->flags & flag) { 70997914Stjr if (values) { 71097914Stjr out1str(cmdname); 71197914Stjr out1c(' '); 71297914Stjr } 7131556Srgrimes for (p = vp->text ; *p != '=' ; p++) 7141556Srgrimes out1c(*p); 71597914Stjr if (values && !(vp->flags & VUNSET)) { 71697914Stjr out1c('='); 71797914Stjr out1qstr(p + 1); 71897914Stjr } 7191556Srgrimes out1c('\n'); 7201556Srgrimes } 7211556Srgrimes } 7221556Srgrimes } 7231556Srgrimes } 7241556Srgrimes return 0; 7251556Srgrimes} 7261556Srgrimes 7271556Srgrimes 7281556Srgrimes/* 7291556Srgrimes * The "local" command. 7301556Srgrimes */ 7311556Srgrimes 73217987Speterint 73390111Simplocalcmd(int argc __unused, char **argv __unused) 73417987Speter{ 7351556Srgrimes char *name; 7361556Srgrimes 7371556Srgrimes if (! in_function()) 7381556Srgrimes error("Not in a function"); 7391556Srgrimes while ((name = *argptr++) != NULL) { 7401556Srgrimes mklocal(name); 7411556Srgrimes } 7421556Srgrimes return 0; 7431556Srgrimes} 7441556Srgrimes 7451556Srgrimes 7461556Srgrimes/* 7471556Srgrimes * Make a variable a local variable. When a variable is made local, it's 7481556Srgrimes * value and flags are saved in a localvar structure. The saved values 7491556Srgrimes * will be restored when the shell function returns. We handle the name 7501556Srgrimes * "-" as a special case. 7511556Srgrimes */ 7521556Srgrimes 7531556Srgrimesvoid 75490111Simpmklocal(char *name) 75590111Simp{ 7561556Srgrimes struct localvar *lvp; 7571556Srgrimes struct var **vpp; 7581556Srgrimes struct var *vp; 7591556Srgrimes 7601556Srgrimes INTOFF; 7611556Srgrimes lvp = ckmalloc(sizeof (struct localvar)); 7621556Srgrimes if (name[0] == '-' && name[1] == '\0') { 7631556Srgrimes lvp->text = ckmalloc(sizeof optlist); 76417987Speter memcpy(lvp->text, optlist, sizeof optlist); 7651556Srgrimes vp = NULL; 7661556Srgrimes } else { 7671556Srgrimes vpp = hashvar(name); 7681556Srgrimes for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next); 7691556Srgrimes if (vp == NULL) { 7701556Srgrimes if (strchr(name, '=')) 7711556Srgrimes setvareq(savestr(name), VSTRFIXED); 7721556Srgrimes else 7731556Srgrimes setvar(name, NULL, VSTRFIXED); 7741556Srgrimes vp = *vpp; /* the new variable */ 7751556Srgrimes lvp->text = NULL; 7761556Srgrimes lvp->flags = VUNSET; 7771556Srgrimes } else { 7781556Srgrimes lvp->text = vp->text; 7791556Srgrimes lvp->flags = vp->flags; 7801556Srgrimes vp->flags |= VSTRFIXED|VTEXTFIXED; 7811556Srgrimes if (strchr(name, '=')) 7821556Srgrimes setvareq(savestr(name), 0); 7831556Srgrimes } 7841556Srgrimes } 7851556Srgrimes lvp->vp = vp; 7861556Srgrimes lvp->next = localvars; 7871556Srgrimes localvars = lvp; 7881556Srgrimes INTON; 7891556Srgrimes} 7901556Srgrimes 7911556Srgrimes 7921556Srgrimes/* 7931556Srgrimes * Called after a function returns. 7941556Srgrimes */ 7951556Srgrimes 7961556Srgrimesvoid 79790111Simppoplocalvars(void) 79890111Simp{ 7991556Srgrimes struct localvar *lvp; 8001556Srgrimes struct var *vp; 8011556Srgrimes 8021556Srgrimes while ((lvp = localvars) != NULL) { 8031556Srgrimes localvars = lvp->next; 8041556Srgrimes vp = lvp->vp; 8051556Srgrimes if (vp == NULL) { /* $- saved */ 80617987Speter memcpy(optlist, lvp->text, sizeof optlist); 8071556Srgrimes ckfree(lvp->text); 8081556Srgrimes } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { 8091556Srgrimes (void)unsetvar(vp->text); 8101556Srgrimes } else { 8111556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 8121556Srgrimes ckfree(vp->text); 8131556Srgrimes vp->flags = lvp->flags; 8141556Srgrimes vp->text = lvp->text; 8151556Srgrimes } 8161556Srgrimes ckfree(lvp); 8171556Srgrimes } 8181556Srgrimes} 8191556Srgrimes 8201556Srgrimes 82117987Speterint 82290111Simpsetvarcmd(int argc, char **argv) 82317987Speter{ 8241556Srgrimes if (argc <= 2) 8251556Srgrimes return unsetcmd(argc, argv); 8261556Srgrimes else if (argc == 3) 8271556Srgrimes setvar(argv[1], argv[2], 0); 8281556Srgrimes else 8291556Srgrimes error("List assignment not implemented"); 8301556Srgrimes return 0; 8311556Srgrimes} 8321556Srgrimes 8331556Srgrimes 8341556Srgrimes/* 8351556Srgrimes * The unset builtin command. We unset the function before we unset the 8361556Srgrimes * variable to allow a function to be unset when there is a readonly variable 8371556Srgrimes * with the same name. 8381556Srgrimes */ 8391556Srgrimes 84017987Speterint 84190111Simpunsetcmd(int argc __unused, char **argv __unused) 84217987Speter{ 8431556Srgrimes char **ap; 8441556Srgrimes int i; 8451556Srgrimes int flg_func = 0; 8461556Srgrimes int flg_var = 0; 8471556Srgrimes int ret = 0; 8481556Srgrimes 8491556Srgrimes while ((i = nextopt("vf")) != '\0') { 8501556Srgrimes if (i == 'f') 8511556Srgrimes flg_func = 1; 8521556Srgrimes else 8531556Srgrimes flg_var = 1; 8541556Srgrimes } 8551556Srgrimes if (flg_func == 0 && flg_var == 0) 8561556Srgrimes flg_var = 1; 8578855Srgrimes 8581556Srgrimes for (ap = argptr; *ap ; ap++) { 8591556Srgrimes if (flg_func) 8601556Srgrimes ret |= unsetfunc(*ap); 8611556Srgrimes if (flg_var) 8621556Srgrimes ret |= unsetvar(*ap); 8631556Srgrimes } 8641556Srgrimes return ret; 8651556Srgrimes} 8661556Srgrimes 8671556Srgrimes 8681556Srgrimes/* 8691556Srgrimes * Unset the specified variable. 8701556Srgrimes */ 8711556Srgrimes 87220425Ssteveint 873200956Sjillesunsetvar(const char *s) 87490111Simp{ 8751556Srgrimes struct var **vpp; 8761556Srgrimes struct var *vp; 8771556Srgrimes 8781556Srgrimes vpp = hashvar(s); 8791556Srgrimes for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { 8801556Srgrimes if (varequal(vp->text, s)) { 8811556Srgrimes if (vp->flags & VREADONLY) 8821556Srgrimes return (1); 8831556Srgrimes INTOFF; 8841556Srgrimes if (*(strchr(vp->text, '=') + 1) != '\0') 8851556Srgrimes setvar(s, nullstr, 0); 88617525Sache if ((vp->flags & VEXPORT) && localevar(vp->text)) { 887171268Sscf change_env(s, 0); 88817525Sache setlocale(LC_ALL, ""); 88917525Sache } 89020425Ssteve vp->flags &= ~VEXPORT; 8911556Srgrimes vp->flags |= VUNSET; 8921556Srgrimes if ((vp->flags & VSTRFIXED) == 0) { 8931556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 8941556Srgrimes ckfree(vp->text); 8951556Srgrimes *vpp = vp->next; 8961556Srgrimes ckfree(vp); 8971556Srgrimes } 8981556Srgrimes INTON; 8991556Srgrimes return (0); 9001556Srgrimes } 9011556Srgrimes } 9021556Srgrimes 903135856Sdes return (0); 9041556Srgrimes} 9051556Srgrimes 9061556Srgrimes 9071556Srgrimes 9081556Srgrimes/* 9091556Srgrimes * Find the appropriate entry in the hash table from the name. 9101556Srgrimes */ 9111556Srgrimes 9121556SrgrimesSTATIC struct var ** 913200956Sjilleshashvar(const char *p) 91490111Simp{ 9151556Srgrimes unsigned int hashval; 9161556Srgrimes 91720425Ssteve hashval = ((unsigned char) *p) << 4; 9181556Srgrimes while (*p && *p != '=') 91920425Ssteve hashval += (unsigned char) *p++; 9201556Srgrimes return &vartab[hashval % VTABSIZE]; 9211556Srgrimes} 9221556Srgrimes 9231556Srgrimes 9241556Srgrimes 9251556Srgrimes/* 9261556Srgrimes * Returns true if the two strings specify the same varable. The first 9271556Srgrimes * variable name is terminated by '='; the second may be terminated by 9281556Srgrimes * either '=' or '\0'. 9291556Srgrimes */ 9301556Srgrimes 9311556SrgrimesSTATIC int 932200956Sjillesvarequal(const char *p, const char *q) 93390111Simp{ 9341556Srgrimes while (*p == *q++) { 9351556Srgrimes if (*p++ == '=') 9361556Srgrimes return 1; 9371556Srgrimes } 9381556Srgrimes if (*p == '=' && *(q - 1) == '\0') 9391556Srgrimes return 1; 9401556Srgrimes return 0; 9411556Srgrimes} 942