var.c revision 264643
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: stable/9/bin/sh/var.c 264643 2014-04-18 12:34:10Z 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> 50221559Sjilles#include <langinfo.h> 5117525Sache 521556Srgrimes#include "shell.h" 531556Srgrimes#include "output.h" 541556Srgrimes#include "expand.h" 551556Srgrimes#include "nodes.h" /* for other headers */ 561556Srgrimes#include "eval.h" /* defines cmdenviron */ 571556Srgrimes#include "exec.h" 581556Srgrimes#include "syntax.h" 591556Srgrimes#include "options.h" 601556Srgrimes#include "mail.h" 611556Srgrimes#include "var.h" 621556Srgrimes#include "memalloc.h" 631556Srgrimes#include "error.h" 641556Srgrimes#include "mystring.h" 6520425Ssteve#include "parser.h" 66223060Sjilles#include "builtins.h" 6717987Speter#ifndef NO_HISTORY 6817987Speter#include "myhistedit.h" 6917987Speter#endif 701556Srgrimes 711556Srgrimes 721556Srgrimes#define VTABSIZE 39 731556Srgrimes 741556Srgrimes 751556Srgrimesstruct varinit { 761556Srgrimes struct var *var; 771556Srgrimes int flags; 78201056Sjilles const char *text; 7990111Simp void (*func)(const char *); 801556Srgrimes}; 811556Srgrimes 821556Srgrimes 8317987Speter#ifndef NO_HISTORY 841556Srgrimesstruct var vhistsize; 85208755Sjillesstruct var vterm; 8617987Speter#endif 871556Srgrimesstruct var vifs; 881556Srgrimesstruct var vmail; 891556Srgrimesstruct var vmpath; 901556Srgrimesstruct var vpath; 9197689Stjrstruct var vppid; 921556Srgrimesstruct var vps1; 931556Srgrimesstruct var vps2; 94159632Sstefanfstruct var vps4; 951556Srgrimesstruct var vvers; 96213760Sobrienstatic struct var voptind; 97249242Sjillesstruct var vdisvfork; 981556Srgrimes 99223024Sjillesint forcelocal; 100223024Sjilles 101213760Sobrienstatic const struct varinit varinit[] = { 10217987Speter#ifndef NO_HISTORY 103201056Sjilles { &vhistsize, VUNSET, "HISTSIZE=", 10420425Ssteve sethistsize }, 10517987Speter#endif 106201056Sjilles { &vifs, 0, "IFS= \t\n", 10720425Ssteve NULL }, 108201056Sjilles { &vmail, VUNSET, "MAIL=", 10920425Ssteve NULL }, 110201056Sjilles { &vmpath, VUNSET, "MAILPATH=", 11120425Ssteve NULL }, 112201056Sjilles { &vpath, 0, "PATH=" _PATH_DEFPATH, 11320425Ssteve changepath }, 114201056Sjilles { &vppid, VUNSET, "PPID=", 11597689Stjr NULL }, 1168855Srgrimes /* 1171556Srgrimes * vps1 depends on uid 1181556Srgrimes */ 119201056Sjilles { &vps2, 0, "PS2=> ", 12020425Ssteve NULL }, 121201056Sjilles { &vps4, 0, "PS4=+ ", 122159632Sstefanf NULL }, 123208755Sjilles#ifndef NO_HISTORY 124208755Sjilles { &vterm, VUNSET, "TERM=", 125208755Sjilles setterm }, 126208755Sjilles#endif 127201056Sjilles { &voptind, 0, "OPTIND=1", 12820425Ssteve getoptsreset }, 129249242Sjilles { &vdisvfork, VUNSET, "SH_DISABLE_VFORK=", 130249242Sjilles NULL }, 13120425Ssteve { NULL, 0, NULL, 13220425Ssteve NULL } 1331556Srgrimes}; 1341556Srgrimes 135213760Sobrienstatic struct var *vartab[VTABSIZE]; 1361556Srgrimes 137213760Sobrienstatic const char *const locale_names[7] = { 138207678Sjilles "LC_COLLATE", "LC_CTYPE", "LC_MONETARY", 139207678Sjilles "LC_NUMERIC", "LC_TIME", "LC_MESSAGES", NULL 140207678Sjilles}; 141213760Sobrienstatic const int locale_categories[7] = { 142207678Sjilles LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME, LC_MESSAGES, 0 143207678Sjilles}; 144207678Sjilles 145213811Sobrienstatic int varequal(const char *, const char *); 146221668Sjillesstatic struct var *find_var(const char *, struct var ***, int *); 147213811Sobrienstatic int localevar(const char *); 1481556Srgrimes 1491556Srgrimes/* 150155302Sschweikh * Initialize the variable symbol tables and import the environment. 1511556Srgrimes */ 1521556Srgrimes 1531556Srgrimes#ifdef mkinit 1541556SrgrimesINCLUDE "var.h" 155201053SjillesMKINIT char **environ; 1561556SrgrimesINIT { 1571556Srgrimes char **envp; 1581556Srgrimes 1591556Srgrimes initvar(); 1601556Srgrimes for (envp = environ ; *envp ; envp++) { 1611556Srgrimes if (strchr(*envp, '=')) { 1621556Srgrimes setvareq(*envp, VEXPORT|VTEXTFIXED); 1631556Srgrimes } 1641556Srgrimes } 1651556Srgrimes} 1661556Srgrimes#endif 1671556Srgrimes 1681556Srgrimes 1691556Srgrimes/* 1701556Srgrimes * This routine initializes the builtin variables. It is called when the 171218306Sjilles * shell is initialized. 1721556Srgrimes */ 1731556Srgrimes 1741556Srgrimesvoid 17590111Simpinitvar(void) 17690111Simp{ 17797689Stjr char ppid[20]; 1781556Srgrimes const struct varinit *ip; 1791556Srgrimes struct var *vp; 1801556Srgrimes struct var **vpp; 1811556Srgrimes 1821556Srgrimes for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { 183221668Sjilles if (find_var(ip->text, &vpp, &vp->name_len) != NULL) 184221668Sjilles continue; 185221668Sjilles vp->next = *vpp; 186221668Sjilles *vpp = vp; 187221668Sjilles vp->text = __DECONST(char *, ip->text); 188221668Sjilles vp->flags = ip->flags | VSTRFIXED | VTEXTFIXED; 189221668Sjilles vp->func = ip->func; 1901556Srgrimes } 1911556Srgrimes /* 1921556Srgrimes * PS1 depends on uid 1931556Srgrimes */ 194221668Sjilles if (find_var("PS1", &vpp, &vps1.name_len) == NULL) { 1951556Srgrimes vps1.next = *vpp; 1961556Srgrimes *vpp = &vps1; 197201056Sjilles vps1.text = __DECONST(char *, geteuid() ? "PS1=$ " : "PS1=# "); 1981556Srgrimes vps1.flags = VSTRFIXED|VTEXTFIXED; 1991556Srgrimes } 20097689Stjr if ((vppid.flags & VEXPORT) == 0) { 20197689Stjr fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); 20297689Stjr setvarsafe("PPID", ppid, 0); 20397689Stjr } 2041556Srgrimes} 2051556Srgrimes 2061556Srgrimes/* 20720425Ssteve * Safe version of setvar, returns 1 on success 0 on failure. 20820425Ssteve */ 20920425Ssteve 21020425Ssteveint 211200956Sjillessetvarsafe(const char *name, const char *val, int flags) 21220425Ssteve{ 21320425Ssteve struct jmploc jmploc; 214194765Sjilles struct jmploc *const savehandler = handler; 21520425Ssteve int err = 0; 216199660Sjilles int inton; 21720425Ssteve 218199660Sjilles inton = is_int_on(); 21920425Ssteve if (setjmp(jmploc.loc)) 22020425Ssteve err = 1; 22120425Ssteve else { 22220425Ssteve handler = &jmploc; 22320425Ssteve setvar(name, val, flags); 22420425Ssteve } 22520425Ssteve handler = savehandler; 226199660Sjilles SETINTON(inton); 22720425Ssteve return err; 22820425Ssteve} 22920425Ssteve 23020425Ssteve/* 231155302Sschweikh * Set the value of a variable. The flags argument is stored with the 2321556Srgrimes * flags of the variable. If val is NULL, the variable is unset. 2331556Srgrimes */ 2341556Srgrimes 2351556Srgrimesvoid 236200956Sjillessetvar(const char *name, const char *val, int flags) 23717987Speter{ 238200956Sjilles const char *p; 2391556Srgrimes int len; 2401556Srgrimes int namelen; 2411556Srgrimes char *nameeq; 2421556Srgrimes int isbad; 2431556Srgrimes 2441556Srgrimes isbad = 0; 2451556Srgrimes p = name; 24617525Sache if (! is_name(*p)) 2471556Srgrimes isbad = 1; 24817525Sache p++; 2491556Srgrimes for (;;) { 2501556Srgrimes if (! is_in_name(*p)) { 2511556Srgrimes if (*p == '\0' || *p == '=') 2521556Srgrimes break; 2531556Srgrimes isbad = 1; 2541556Srgrimes } 2551556Srgrimes p++; 2561556Srgrimes } 2571556Srgrimes namelen = p - name; 2581556Srgrimes if (isbad) 2591556Srgrimes error("%.*s: bad variable name", namelen, name); 2601556Srgrimes len = namelen + 2; /* 2 is space for '=' and '\0' */ 2611556Srgrimes if (val == NULL) { 2621556Srgrimes flags |= VUNSET; 2631556Srgrimes } else { 2641556Srgrimes len += strlen(val); 2651556Srgrimes } 266264629Sjilles INTOFF; 267200956Sjilles nameeq = ckmalloc(len); 268200956Sjilles memcpy(nameeq, name, namelen); 269200956Sjilles nameeq[namelen] = '='; 2701556Srgrimes if (val) 271200956Sjilles scopy(val, nameeq + namelen + 1); 272200956Sjilles else 273200956Sjilles nameeq[namelen + 1] = '\0'; 2741556Srgrimes setvareq(nameeq, flags); 275264629Sjilles INTON; 2761556Srgrimes} 2771556Srgrimes 278213811Sobrienstatic int 279200956Sjilleslocalevar(const char *s) 28090111Simp{ 281207678Sjilles const char *const *ss; 2821556Srgrimes 28317525Sache if (*s != 'L') 28417525Sache return 0; 28517525Sache if (varequal(s + 1, "ANG")) 28617525Sache return 1; 28717525Sache if (strncmp(s + 1, "C_", 2) != 0) 28817525Sache return 0; 289207678Sjilles if (varequal(s + 3, "ALL")) 290207678Sjilles return 1; 291207678Sjilles for (ss = locale_names; *ss ; ss++) 292207678Sjilles if (varequal(s + 3, *ss + 3)) 29317525Sache return 1; 29417525Sache return 0; 29517525Sache} 2961556Srgrimes 297171268Sscf 2981556Srgrimes/* 299171268Sscf * Sets/unsets an environment variable from a pointer that may actually be a 300171268Sscf * pointer into environ where the string should not be manipulated. 301171268Sscf */ 302213811Sobrienstatic void 303200956Sjilleschange_env(const char *s, int set) 304171268Sscf{ 305171268Sscf char *eqp; 306171268Sscf char *ss; 307171268Sscf 308264629Sjilles INTOFF; 309171268Sscf ss = savestr(s); 310171268Sscf if ((eqp = strchr(ss, '=')) != NULL) 311171268Sscf *eqp = '\0'; 312171268Sscf if (set && eqp != NULL) 313171268Sscf (void) setenv(ss, eqp + 1, 1); 314171268Sscf else 315171268Sscf (void) unsetenv(ss); 316171268Sscf ckfree(ss); 317264629Sjilles INTON; 318171268Sscf 319171268Sscf return; 320171268Sscf} 321171268Sscf 322171268Sscf 323171268Sscf/* 3241556Srgrimes * Same as setvar except that the variable and value are passed in 3251556Srgrimes * the first argument as name=value. Since the first argument will 3261556Srgrimes * be actually stored in the table, it should not be a string that 3271556Srgrimes * will go away. 3281556Srgrimes */ 3291556Srgrimes 3301556Srgrimesvoid 33190111Simpsetvareq(char *s, int flags) 33217987Speter{ 3331556Srgrimes struct var *vp, **vpp; 334221668Sjilles int nlen; 3351556Srgrimes 33645263Scracauer if (aflag) 33745263Scracauer flags |= VEXPORT; 338223024Sjilles if (forcelocal && !(flags & (VNOSET | VNOLOCAL))) 339223024Sjilles mklocal(s); 340221668Sjilles vp = find_var(s, &vpp, &nlen); 341221668Sjilles if (vp != NULL) { 342264643Sjilles if (vp->flags & VREADONLY) { 343264643Sjilles if ((flags & (VTEXTFIXED|VSTACK)) == 0) 344264643Sjilles ckfree(s); 345221668Sjilles error("%.*s: is read only", vp->name_len, s); 346264643Sjilles } 347221668Sjilles if (flags & VNOSET) 348221668Sjilles return; 349221668Sjilles INTOFF; 35020425Ssteve 351221668Sjilles if (vp->func && (flags & VNOFUNC) == 0) 352221668Sjilles (*vp->func)(s + vp->name_len + 1); 35320425Ssteve 354221668Sjilles if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) 355221668Sjilles ckfree(vp->text); 35620425Ssteve 357221668Sjilles vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); 358221668Sjilles vp->flags |= flags; 359221668Sjilles vp->text = s; 36020425Ssteve 361221668Sjilles /* 362221668Sjilles * We could roll this to a function, to handle it as 363221668Sjilles * a regular variable function callback, but why bother? 364221668Sjilles * 365221668Sjilles * Note: this assumes iflag is not set to 1 initially. 366221668Sjilles * As part of init(), this is called before arguments 367221668Sjilles * are looked at. 368221668Sjilles */ 369221668Sjilles if ((vp == &vmpath || (vp == &vmail && ! mpathset())) && 370221668Sjilles iflag == 1) 371221668Sjilles chkmail(1); 372221668Sjilles if ((vp->flags & VEXPORT) && localevar(s)) { 373221668Sjilles change_env(s, 1); 374221668Sjilles (void) setlocale(LC_ALL, ""); 375221668Sjilles updatecharset(); 3761556Srgrimes } 377221668Sjilles INTON; 378221668Sjilles return; 3791556Srgrimes } 3801556Srgrimes /* not found */ 381216870Sjilles if (flags & VNOSET) 382216870Sjilles return; 383264629Sjilles INTOFF; 3841556Srgrimes vp = ckmalloc(sizeof (*vp)); 3851556Srgrimes vp->flags = flags; 3861556Srgrimes vp->text = s; 387221668Sjilles vp->name_len = nlen; 3881556Srgrimes vp->next = *vpp; 38920425Ssteve vp->func = NULL; 3901556Srgrimes *vpp = vp; 39117525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 392171268Sscf change_env(s, 1); 39317525Sache (void) setlocale(LC_ALL, ""); 394221559Sjilles updatecharset(); 39517525Sache } 39617525Sache INTON; 3971556Srgrimes} 3981556Srgrimes 3991556Srgrimes 4001556Srgrimes 4011556Srgrimes/* 4021556Srgrimes * Process a linked list of variable assignments. 4031556Srgrimes */ 4041556Srgrimes 4051556Srgrimesvoid 406216870Sjilleslistsetvar(struct strlist *list, int flags) 40790111Simp{ 4081556Srgrimes struct strlist *lp; 4091556Srgrimes 4101556Srgrimes INTOFF; 4111556Srgrimes for (lp = list ; lp ; lp = lp->next) { 412216870Sjilles setvareq(savestr(lp->text), flags); 4131556Srgrimes } 4141556Srgrimes INTON; 4151556Srgrimes} 4161556Srgrimes 4171556Srgrimes 4181556Srgrimes 4191556Srgrimes/* 4201556Srgrimes * Find the value of a variable. Returns NULL if not set. 4211556Srgrimes */ 4221556Srgrimes 4231556Srgrimeschar * 424200956Sjilleslookupvar(const char *name) 42590111Simp{ 4261556Srgrimes struct var *v; 4271556Srgrimes 428221668Sjilles v = find_var(name, NULL, NULL); 429221668Sjilles if (v == NULL || v->flags & VUNSET) 430221668Sjilles return NULL; 431221668Sjilles return v->text + v->name_len + 1; 4321556Srgrimes} 4331556Srgrimes 4341556Srgrimes 4351556Srgrimes 4361556Srgrimes/* 4371556Srgrimes * Search the environment of a builtin command. If the second argument 4381556Srgrimes * is nonzero, return the value of a variable even if it hasn't been 4391556Srgrimes * exported. 4401556Srgrimes */ 4411556Srgrimes 4421556Srgrimeschar * 443200956Sjillesbltinlookup(const char *name, int doall) 44417987Speter{ 4451556Srgrimes struct strlist *sp; 4461556Srgrimes struct var *v; 447212467Sjilles char *result; 4481556Srgrimes 449212467Sjilles result = NULL; 4501556Srgrimes for (sp = cmdenviron ; sp ; sp = sp->next) { 4511556Srgrimes if (varequal(sp->text, name)) 452212467Sjilles result = strchr(sp->text, '=') + 1; 4531556Srgrimes } 454212467Sjilles if (result != NULL) 455212467Sjilles return result; 456221668Sjilles 457221668Sjilles v = find_var(name, NULL, NULL); 458221668Sjilles if (v == NULL || v->flags & VUNSET || 459221668Sjilles (!doall && (v->flags & VEXPORT) == 0)) 460221668Sjilles return NULL; 461221668Sjilles return v->text + v->name_len + 1; 4621556Srgrimes} 4631556Srgrimes 4641556Srgrimes 465207678Sjilles/* 466207678Sjilles * Set up locale for a builtin (LANG/LC_* assignments). 467207678Sjilles */ 468207678Sjillesvoid 469207678Sjillesbltinsetlocale(void) 470207678Sjilles{ 471207678Sjilles struct strlist *lp; 472207678Sjilles int act = 0; 473207678Sjilles char *loc, *locdef; 474207678Sjilles int i; 4751556Srgrimes 476207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 477207678Sjilles if (localevar(lp->text)) { 478207678Sjilles act = 1; 479207678Sjilles break; 480207678Sjilles } 481207678Sjilles } 482207678Sjilles if (!act) 483207678Sjilles return; 484207678Sjilles loc = bltinlookup("LC_ALL", 0); 485207678Sjilles INTOFF; 486207678Sjilles if (loc != NULL) { 487207678Sjilles setlocale(LC_ALL, loc); 488207678Sjilles INTON; 489221559Sjilles updatecharset(); 490207678Sjilles return; 491207678Sjilles } 492207678Sjilles locdef = bltinlookup("LANG", 0); 493207678Sjilles for (i = 0; locale_names[i] != NULL; i++) { 494207678Sjilles loc = bltinlookup(locale_names[i], 0); 495207678Sjilles if (loc == NULL) 496207678Sjilles loc = locdef; 497207678Sjilles if (loc != NULL) 498207678Sjilles setlocale(locale_categories[i], loc); 499207678Sjilles } 500207678Sjilles INTON; 501221559Sjilles updatecharset(); 502207678Sjilles} 503207678Sjilles 5041556Srgrimes/* 505207678Sjilles * Undo the effect of bltinlocaleset(). 506207678Sjilles */ 507207678Sjillesvoid 508207678Sjillesbltinunsetlocale(void) 509207678Sjilles{ 510207678Sjilles struct strlist *lp; 511207678Sjilles 512207678Sjilles INTOFF; 513207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 514207678Sjilles if (localevar(lp->text)) { 515207678Sjilles setlocale(LC_ALL, ""); 516221559Sjilles updatecharset(); 517207678Sjilles return; 518207678Sjilles } 519207678Sjilles } 520207678Sjilles INTON; 521207678Sjilles} 522207678Sjilles 523221559Sjilles/* 524221559Sjilles * Update the localeisutf8 flag. 525221559Sjilles */ 526221559Sjillesvoid 527221559Sjillesupdatecharset(void) 528221559Sjilles{ 529221559Sjilles char *charset; 530207678Sjilles 531221559Sjilles charset = nl_langinfo(CODESET); 532221559Sjilles localeisutf8 = !strcmp(charset, "UTF-8"); 533221559Sjilles} 534221559Sjilles 535221669Sjillesvoid 536221669Sjillesinitcharset(void) 537221669Sjilles{ 538221669Sjilles updatecharset(); 539221669Sjilles initial_localeisutf8 = localeisutf8; 540221669Sjilles} 541221669Sjilles 542207678Sjilles/* 5431556Srgrimes * Generate a list of exported variables. This routine is used to construct 5441556Srgrimes * the third argument to execve when executing a program. 5451556Srgrimes */ 5461556Srgrimes 5471556Srgrimeschar ** 54890111Simpenvironment(void) 54990111Simp{ 5501556Srgrimes int nenv; 5511556Srgrimes struct var **vpp; 5521556Srgrimes struct var *vp; 5531556Srgrimes char **env, **ep; 5541556Srgrimes 5551556Srgrimes nenv = 0; 5561556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5571556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5581556Srgrimes if (vp->flags & VEXPORT) 5591556Srgrimes nenv++; 5601556Srgrimes } 5611556Srgrimes ep = env = stalloc((nenv + 1) * sizeof *env); 5621556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5631556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5641556Srgrimes if (vp->flags & VEXPORT) 5651556Srgrimes *ep++ = vp->text; 5661556Srgrimes } 5671556Srgrimes *ep = NULL; 5681556Srgrimes return env; 5691556Srgrimes} 5701556Srgrimes 5711556Srgrimes 572213811Sobrienstatic int 573158145Sstefanfvar_compare(const void *a, const void *b) 574158145Sstefanf{ 575158145Sstefanf const char *const *sa, *const *sb; 5761556Srgrimes 577158145Sstefanf sa = a; 578158145Sstefanf sb = b; 579158145Sstefanf /* 580158145Sstefanf * This compares two var=value strings which creates a different 581158145Sstefanf * order from what you would probably expect. POSIX is somewhat 582158145Sstefanf * ambiguous on what should be sorted exactly. 583158145Sstefanf */ 584158145Sstefanf return strcoll(*sa, *sb); 585158145Sstefanf} 586158145Sstefanf 587158145Sstefanf 5881556Srgrimes/* 589217847Sjilles * Command to list all variables which are set. This is invoked from the 590217847Sjilles * set command when it is called without any options or operands. 5911556Srgrimes */ 5921556Srgrimes 5931556Srgrimesint 59490111Simpshowvarscmd(int argc __unused, char **argv __unused) 59517987Speter{ 5961556Srgrimes struct var **vpp; 5971556Srgrimes struct var *vp; 59897915Stjr const char *s; 599158145Sstefanf const char **vars; 600158145Sstefanf int i, n; 6011556Srgrimes 602158145Sstefanf /* 603158145Sstefanf * POSIX requires us to sort the variables. 604158145Sstefanf */ 605158145Sstefanf n = 0; 606158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 607158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 608158145Sstefanf if (!(vp->flags & VUNSET)) 609158145Sstefanf n++; 6101556Srgrimes } 6111556Srgrimes } 612158145Sstefanf 613231529Sjilles INTOFF; 614158145Sstefanf vars = ckmalloc(n * sizeof(*vars)); 615158145Sstefanf i = 0; 616158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 617158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 618158145Sstefanf if (!(vp->flags & VUNSET)) 619158145Sstefanf vars[i++] = vp->text; 620158145Sstefanf } 621158145Sstefanf } 622158145Sstefanf 623158145Sstefanf qsort(vars, n, sizeof(*vars), var_compare); 624158145Sstefanf for (i = 0; i < n; i++) { 625223183Sjilles /* 626223183Sjilles * Skip improper variable names so the output remains usable as 627223183Sjilles * shell input. 628223183Sjilles */ 629223183Sjilles if (!isassignment(vars[i])) 630223183Sjilles continue; 631215567Sjilles s = strchr(vars[i], '='); 632215567Sjilles s++; 633215567Sjilles outbin(vars[i], s - vars[i], out1); 634215567Sjilles out1qstr(s); 635158145Sstefanf out1c('\n'); 636158145Sstefanf } 637158145Sstefanf ckfree(vars); 638231529Sjilles INTON; 639158145Sstefanf 6401556Srgrimes return 0; 6411556Srgrimes} 6421556Srgrimes 6431556Srgrimes 6441556Srgrimes 6451556Srgrimes/* 6461556Srgrimes * The export and readonly commands. 6471556Srgrimes */ 6481556Srgrimes 6491556Srgrimesint 65090111Simpexportcmd(int argc, char **argv) 65117987Speter{ 6521556Srgrimes struct var **vpp; 6531556Srgrimes struct var *vp; 6541556Srgrimes char *name; 6551556Srgrimes char *p; 65697914Stjr char *cmdname; 65797914Stjr int ch, values; 6581556Srgrimes int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; 6591556Srgrimes 66097914Stjr cmdname = argv[0]; 66197914Stjr optreset = optind = 1; 662100663Stjr opterr = 0; 66397914Stjr values = 0; 66497914Stjr while ((ch = getopt(argc, argv, "p")) != -1) { 66597914Stjr switch (ch) { 66697914Stjr case 'p': 66797914Stjr values = 1; 66897914Stjr break; 66997914Stjr case '?': 67097914Stjr default: 67197914Stjr error("unknown option: -%c", optopt); 67297914Stjr } 67397914Stjr } 67497914Stjr argc -= optind; 67597914Stjr argv += optind; 67697914Stjr 677149919Sstefanf if (values && argc != 0) 678149919Sstefanf error("-p requires no arguments"); 67997914Stjr if (argc != 0) { 680149919Sstefanf while ((name = *argv++) != NULL) { 6811556Srgrimes if ((p = strchr(name, '=')) != NULL) { 6821556Srgrimes p++; 6831556Srgrimes } else { 684221668Sjilles vp = find_var(name, NULL, NULL); 685221668Sjilles if (vp != NULL) { 686221668Sjilles vp->flags |= flag; 687221668Sjilles if ((vp->flags & VEXPORT) && localevar(vp->text)) { 688221668Sjilles change_env(vp->text, 1); 689221668Sjilles (void) setlocale(LC_ALL, ""); 690221668Sjilles updatecharset(); 6911556Srgrimes } 692221668Sjilles continue; 6931556Srgrimes } 6941556Srgrimes } 6951556Srgrimes setvar(name, p, flag); 6961556Srgrimes } 6971556Srgrimes } else { 6981556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 6991556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 7001556Srgrimes if (vp->flags & flag) { 70197914Stjr if (values) { 702223183Sjilles /* 703223183Sjilles * Skip improper variable names 704223183Sjilles * so the output remains usable 705223183Sjilles * as shell input. 706223183Sjilles */ 707223183Sjilles if (!isassignment(vp->text)) 708223183Sjilles continue; 70997914Stjr out1str(cmdname); 71097914Stjr out1c(' '); 71197914Stjr } 71297914Stjr if (values && !(vp->flags & VUNSET)) { 713221975Sjilles outbin(vp->text, 714221975Sjilles vp->name_len + 1, out1); 715221975Sjilles out1qstr(vp->text + 716221975Sjilles vp->name_len + 1); 717215567Sjilles } else 718221975Sjilles outbin(vp->text, vp->name_len, 719215567Sjilles out1); 7201556Srgrimes out1c('\n'); 7211556Srgrimes } 7221556Srgrimes } 7231556Srgrimes } 7241556Srgrimes } 7251556Srgrimes return 0; 7261556Srgrimes} 7271556Srgrimes 7281556Srgrimes 7291556Srgrimes/* 7301556Srgrimes * The "local" command. 7311556Srgrimes */ 7321556Srgrimes 73317987Speterint 73490111Simplocalcmd(int argc __unused, char **argv __unused) 73517987Speter{ 7361556Srgrimes char *name; 7371556Srgrimes 7381556Srgrimes if (! in_function()) 7391556Srgrimes error("Not in a function"); 7401556Srgrimes while ((name = *argptr++) != NULL) { 7411556Srgrimes mklocal(name); 7421556Srgrimes } 7431556Srgrimes return 0; 7441556Srgrimes} 7451556Srgrimes 7461556Srgrimes 7471556Srgrimes/* 7481556Srgrimes * Make a variable a local variable. When a variable is made local, it's 7491556Srgrimes * value and flags are saved in a localvar structure. The saved values 7501556Srgrimes * will be restored when the shell function returns. We handle the name 7511556Srgrimes * "-" as a special case. 7521556Srgrimes */ 7531556Srgrimes 7541556Srgrimesvoid 75590111Simpmklocal(char *name) 75690111Simp{ 7571556Srgrimes struct localvar *lvp; 7581556Srgrimes struct var **vpp; 7591556Srgrimes struct var *vp; 7601556Srgrimes 7611556Srgrimes INTOFF; 7621556Srgrimes lvp = ckmalloc(sizeof (struct localvar)); 7631556Srgrimes if (name[0] == '-' && name[1] == '\0') { 7641556Srgrimes lvp->text = ckmalloc(sizeof optlist); 76517987Speter memcpy(lvp->text, optlist, sizeof optlist); 7661556Srgrimes vp = NULL; 7671556Srgrimes } else { 768221668Sjilles vp = find_var(name, &vpp, NULL); 7691556Srgrimes if (vp == NULL) { 7701556Srgrimes if (strchr(name, '=')) 771223024Sjilles setvareq(savestr(name), VSTRFIXED | VNOLOCAL); 7721556Srgrimes else 773223024Sjilles setvar(name, NULL, VSTRFIXED | VNOLOCAL); 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; 781221668Sjilles if (name[vp->name_len] == '=') 782223024Sjilles setvareq(savestr(name), VNOLOCAL); 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 802264629Sjilles INTOFF; 8031556Srgrimes while ((lvp = localvars) != NULL) { 8041556Srgrimes localvars = lvp->next; 8051556Srgrimes vp = lvp->vp; 8061556Srgrimes if (vp == NULL) { /* $- saved */ 80717987Speter memcpy(optlist, lvp->text, sizeof optlist); 8081556Srgrimes ckfree(lvp->text); 809215266Sjilles optschanged(); 8101556Srgrimes } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { 8111556Srgrimes (void)unsetvar(vp->text); 8121556Srgrimes } else { 8131556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 8141556Srgrimes ckfree(vp->text); 8151556Srgrimes vp->flags = lvp->flags; 8161556Srgrimes vp->text = lvp->text; 8171556Srgrimes } 8181556Srgrimes ckfree(lvp); 8191556Srgrimes } 820264629Sjilles INTON; 8211556Srgrimes} 8221556Srgrimes 8231556Srgrimes 82417987Speterint 82590111Simpsetvarcmd(int argc, char **argv) 82617987Speter{ 8271556Srgrimes if (argc <= 2) 8281556Srgrimes return unsetcmd(argc, argv); 8291556Srgrimes else if (argc == 3) 8301556Srgrimes setvar(argv[1], argv[2], 0); 8311556Srgrimes else 832214538Sjilles error("too many arguments"); 8331556Srgrimes return 0; 8341556Srgrimes} 8351556Srgrimes 8361556Srgrimes 8371556Srgrimes/* 838217847Sjilles * The unset builtin command. 8391556Srgrimes */ 8401556Srgrimes 84117987Speterint 84290111Simpunsetcmd(int argc __unused, char **argv __unused) 84317987Speter{ 8441556Srgrimes char **ap; 8451556Srgrimes int i; 8461556Srgrimes int flg_func = 0; 8471556Srgrimes int flg_var = 0; 8481556Srgrimes int ret = 0; 8491556Srgrimes 8501556Srgrimes while ((i = nextopt("vf")) != '\0') { 8511556Srgrimes if (i == 'f') 8521556Srgrimes flg_func = 1; 8531556Srgrimes else 8541556Srgrimes flg_var = 1; 8551556Srgrimes } 8561556Srgrimes if (flg_func == 0 && flg_var == 0) 8571556Srgrimes flg_var = 1; 8588855Srgrimes 859264629Sjilles INTOFF; 8601556Srgrimes for (ap = argptr; *ap ; ap++) { 8611556Srgrimes if (flg_func) 8621556Srgrimes ret |= unsetfunc(*ap); 8631556Srgrimes if (flg_var) 8641556Srgrimes ret |= unsetvar(*ap); 8651556Srgrimes } 866264629Sjilles INTON; 8671556Srgrimes return ret; 8681556Srgrimes} 8691556Srgrimes 8701556Srgrimes 8711556Srgrimes/* 8721556Srgrimes * Unset the specified variable. 873264629Sjilles * Called with interrupts off. 8741556Srgrimes */ 8751556Srgrimes 87620425Ssteveint 877200956Sjillesunsetvar(const char *s) 87890111Simp{ 8791556Srgrimes struct var **vpp; 8801556Srgrimes struct var *vp; 8811556Srgrimes 882221668Sjilles vp = find_var(s, &vpp, NULL); 883221668Sjilles if (vp == NULL) 884221668Sjilles return (0); 885221668Sjilles if (vp->flags & VREADONLY) 886221668Sjilles return (1); 887221668Sjilles if (vp->text[vp->name_len + 1] != '\0') 888221668Sjilles setvar(s, nullstr, 0); 889221668Sjilles if ((vp->flags & VEXPORT) && localevar(vp->text)) { 890221668Sjilles change_env(s, 0); 891221668Sjilles setlocale(LC_ALL, ""); 892221668Sjilles updatecharset(); 8931556Srgrimes } 894221668Sjilles vp->flags &= ~VEXPORT; 895221668Sjilles vp->flags |= VUNSET; 896221668Sjilles if ((vp->flags & VSTRFIXED) == 0) { 897221668Sjilles if ((vp->flags & VTEXTFIXED) == 0) 898221668Sjilles ckfree(vp->text); 899221668Sjilles *vpp = vp->next; 900221668Sjilles ckfree(vp); 901221668Sjilles } 902135856Sdes return (0); 9031556Srgrimes} 9041556Srgrimes 9051556Srgrimes 9061556Srgrimes 9071556Srgrimes/* 9081556Srgrimes * Returns true if the two strings specify the same varable. The first 9091556Srgrimes * variable name is terminated by '='; the second may be terminated by 9101556Srgrimes * either '=' or '\0'. 9111556Srgrimes */ 9121556Srgrimes 913213811Sobrienstatic int 914200956Sjillesvarequal(const char *p, const char *q) 91590111Simp{ 9161556Srgrimes while (*p == *q++) { 9171556Srgrimes if (*p++ == '=') 9181556Srgrimes return 1; 9191556Srgrimes } 9201556Srgrimes if (*p == '=' && *(q - 1) == '\0') 9211556Srgrimes return 1; 9221556Srgrimes return 0; 9231556Srgrimes} 924221668Sjilles 925221668Sjilles/* 926221668Sjilles * Search for a variable. 927221668Sjilles * 'name' may be terminated by '=' or a NUL. 928221668Sjilles * vppp is set to the pointer to vp, or the list head if vp isn't found 929221668Sjilles * lenp is set to the number of charactets in 'name' 930221668Sjilles */ 931221668Sjilles 932221668Sjillesstatic struct var * 933221668Sjillesfind_var(const char *name, struct var ***vppp, int *lenp) 934221668Sjilles{ 935221668Sjilles unsigned int hashval; 936221668Sjilles int len; 937221668Sjilles struct var *vp, **vpp; 938221668Sjilles const char *p = name; 939221668Sjilles 940221668Sjilles hashval = 0; 941221668Sjilles while (*p && *p != '=') 942221668Sjilles hashval = 2 * hashval + (unsigned char)*p++; 943221668Sjilles len = p - name; 944221668Sjilles 945221668Sjilles if (lenp) 946221668Sjilles *lenp = len; 947221668Sjilles vpp = &vartab[hashval % VTABSIZE]; 948221668Sjilles if (vppp) 949221668Sjilles *vppp = vpp; 950221668Sjilles 951221668Sjilles for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { 952221668Sjilles if (vp->name_len != len) 953221668Sjilles continue; 954221668Sjilles if (memcmp(vp->text, name, len) != 0) 955221668Sjilles continue; 956221668Sjilles if (vppp) 957221668Sjilles *vppp = vpp; 958221668Sjilles return vp; 959221668Sjilles } 960221668Sjilles return NULL; 961221668Sjilles} 962