var.c revision 263847
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 263847 2014-03-27 22:57:23Z 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; 911556Srgrimesstruct var vps1; 921556Srgrimesstruct var vps2; 93159632Sstefanfstruct var vps4; 94213760Sobrienstatic struct var voptind; 95230998Sjillesstruct var vdisvfork; 961556Srgrimes 97223024Sjillesint forcelocal; 98223024Sjilles 99213760Sobrienstatic const struct varinit varinit[] = { 10017987Speter#ifndef NO_HISTORY 101201056Sjilles { &vhistsize, VUNSET, "HISTSIZE=", 10220425Ssteve sethistsize }, 10317987Speter#endif 104201056Sjilles { &vifs, 0, "IFS= \t\n", 10520425Ssteve NULL }, 106201056Sjilles { &vmail, VUNSET, "MAIL=", 10720425Ssteve NULL }, 108201056Sjilles { &vmpath, VUNSET, "MAILPATH=", 10920425Ssteve NULL }, 110201056Sjilles { &vpath, 0, "PATH=" _PATH_DEFPATH, 11120425Ssteve changepath }, 1128855Srgrimes /* 1131556Srgrimes * vps1 depends on uid 1141556Srgrimes */ 115201056Sjilles { &vps2, 0, "PS2=> ", 11620425Ssteve NULL }, 117201056Sjilles { &vps4, 0, "PS4=+ ", 118159632Sstefanf NULL }, 119208755Sjilles#ifndef NO_HISTORY 120208755Sjilles { &vterm, VUNSET, "TERM=", 121208755Sjilles setterm }, 122208755Sjilles#endif 123201056Sjilles { &voptind, 0, "OPTIND=1", 12420425Ssteve getoptsreset }, 125230998Sjilles { &vdisvfork, VUNSET, "SH_DISABLE_VFORK=", 126230998Sjilles NULL }, 12720425Ssteve { NULL, 0, NULL, 12820425Ssteve NULL } 1291556Srgrimes}; 1301556Srgrimes 131213760Sobrienstatic struct var *vartab[VTABSIZE]; 1321556Srgrimes 133213760Sobrienstatic const char *const locale_names[7] = { 134207678Sjilles "LC_COLLATE", "LC_CTYPE", "LC_MONETARY", 135207678Sjilles "LC_NUMERIC", "LC_TIME", "LC_MESSAGES", NULL 136207678Sjilles}; 137213760Sobrienstatic const int locale_categories[7] = { 138207678Sjilles LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME, LC_MESSAGES, 0 139207678Sjilles}; 140207678Sjilles 141213811Sobrienstatic int varequal(const char *, const char *); 142221668Sjillesstatic struct var *find_var(const char *, struct var ***, int *); 143213811Sobrienstatic int localevar(const char *); 1441556Srgrimes 145245689Sjillesextern char **environ; 1461556Srgrimes 1471556Srgrimes/* 148245689Sjilles * This routine initializes the builtin variables and imports the environment. 149245689Sjilles * It is called when the shell is initialized. 1501556Srgrimes */ 1511556Srgrimes 1521556Srgrimesvoid 15390111Simpinitvar(void) 15490111Simp{ 15597689Stjr char ppid[20]; 1561556Srgrimes const struct varinit *ip; 1571556Srgrimes struct var *vp; 1581556Srgrimes struct var **vpp; 159245689Sjilles char **envp; 1601556Srgrimes 1611556Srgrimes for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { 162221668Sjilles if (find_var(ip->text, &vpp, &vp->name_len) != NULL) 163221668Sjilles continue; 164221668Sjilles vp->next = *vpp; 165221668Sjilles *vpp = vp; 166221668Sjilles vp->text = __DECONST(char *, ip->text); 167221668Sjilles vp->flags = ip->flags | VSTRFIXED | VTEXTFIXED; 168221668Sjilles vp->func = ip->func; 1691556Srgrimes } 1701556Srgrimes /* 1711556Srgrimes * PS1 depends on uid 1721556Srgrimes */ 173221668Sjilles if (find_var("PS1", &vpp, &vps1.name_len) == NULL) { 1741556Srgrimes vps1.next = *vpp; 1751556Srgrimes *vpp = &vps1; 176201056Sjilles vps1.text = __DECONST(char *, geteuid() ? "PS1=$ " : "PS1=# "); 1771556Srgrimes vps1.flags = VSTRFIXED|VTEXTFIXED; 1781556Srgrimes } 179259874Sjilles fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); 180259874Sjilles setvarsafe("PPID", ppid, 0); 181245689Sjilles for (envp = environ ; *envp ; envp++) { 182245689Sjilles if (strchr(*envp, '=')) { 183245689Sjilles setvareq(*envp, VEXPORT|VTEXTFIXED); 184245689Sjilles } 185245689Sjilles } 186259846Sjilles setvareq("OPTIND=1", VTEXTFIXED); 1871556Srgrimes} 1881556Srgrimes 1891556Srgrimes/* 19020425Ssteve * Safe version of setvar, returns 1 on success 0 on failure. 19120425Ssteve */ 19220425Ssteve 19320425Ssteveint 194200956Sjillessetvarsafe(const char *name, const char *val, int flags) 19520425Ssteve{ 19620425Ssteve struct jmploc jmploc; 197194765Sjilles struct jmploc *const savehandler = handler; 19820425Ssteve int err = 0; 199199660Sjilles int inton; 20020425Ssteve 201199660Sjilles inton = is_int_on(); 20220425Ssteve if (setjmp(jmploc.loc)) 20320425Ssteve err = 1; 20420425Ssteve else { 20520425Ssteve handler = &jmploc; 20620425Ssteve setvar(name, val, flags); 20720425Ssteve } 20820425Ssteve handler = savehandler; 209199660Sjilles SETINTON(inton); 21020425Ssteve return err; 21120425Ssteve} 21220425Ssteve 21320425Ssteve/* 214155302Sschweikh * Set the value of a variable. The flags argument is stored with the 2151556Srgrimes * flags of the variable. If val is NULL, the variable is unset. 2161556Srgrimes */ 2171556Srgrimes 2181556Srgrimesvoid 219200956Sjillessetvar(const char *name, const char *val, int flags) 22017987Speter{ 221200956Sjilles const char *p; 222258776Sjilles size_t len; 223258776Sjilles size_t namelen; 224258776Sjilles size_t vallen; 2251556Srgrimes char *nameeq; 2261556Srgrimes int isbad; 2271556Srgrimes 2281556Srgrimes isbad = 0; 2291556Srgrimes p = name; 23017525Sache if (! is_name(*p)) 2311556Srgrimes isbad = 1; 23217525Sache p++; 2331556Srgrimes for (;;) { 2341556Srgrimes if (! is_in_name(*p)) { 2351556Srgrimes if (*p == '\0' || *p == '=') 2361556Srgrimes break; 2371556Srgrimes isbad = 1; 2381556Srgrimes } 2391556Srgrimes p++; 2401556Srgrimes } 2411556Srgrimes namelen = p - name; 2421556Srgrimes if (isbad) 243258776Sjilles error("%.*s: bad variable name", (int)namelen, name); 2441556Srgrimes len = namelen + 2; /* 2 is space for '=' and '\0' */ 2451556Srgrimes if (val == NULL) { 2461556Srgrimes flags |= VUNSET; 247258776Sjilles vallen = 0; 2481556Srgrimes } else { 249258776Sjilles vallen = strlen(val); 250258776Sjilles len += vallen; 2511556Srgrimes } 252263777Sjilles INTOFF; 253200956Sjilles nameeq = ckmalloc(len); 254200956Sjilles memcpy(nameeq, name, namelen); 255200956Sjilles nameeq[namelen] = '='; 2561556Srgrimes if (val) 257258776Sjilles memcpy(nameeq + namelen + 1, val, vallen + 1); 258200956Sjilles else 259200956Sjilles nameeq[namelen + 1] = '\0'; 2601556Srgrimes setvareq(nameeq, flags); 261263777Sjilles INTON; 2621556Srgrimes} 2631556Srgrimes 264213811Sobrienstatic int 265200956Sjilleslocalevar(const char *s) 26690111Simp{ 267207678Sjilles const char *const *ss; 2681556Srgrimes 26917525Sache if (*s != 'L') 27017525Sache return 0; 27117525Sache if (varequal(s + 1, "ANG")) 27217525Sache return 1; 27317525Sache if (strncmp(s + 1, "C_", 2) != 0) 27417525Sache return 0; 275207678Sjilles if (varequal(s + 3, "ALL")) 276207678Sjilles return 1; 277207678Sjilles for (ss = locale_names; *ss ; ss++) 278207678Sjilles if (varequal(s + 3, *ss + 3)) 27917525Sache return 1; 28017525Sache return 0; 28117525Sache} 2821556Srgrimes 283171268Sscf 2841556Srgrimes/* 285171268Sscf * Sets/unsets an environment variable from a pointer that may actually be a 286171268Sscf * pointer into environ where the string should not be manipulated. 287171268Sscf */ 288213811Sobrienstatic void 289200956Sjilleschange_env(const char *s, int set) 290171268Sscf{ 291171268Sscf char *eqp; 292171268Sscf char *ss; 293171268Sscf 294263777Sjilles INTOFF; 295171268Sscf ss = savestr(s); 296171268Sscf if ((eqp = strchr(ss, '=')) != NULL) 297171268Sscf *eqp = '\0'; 298171268Sscf if (set && eqp != NULL) 299171268Sscf (void) setenv(ss, eqp + 1, 1); 300171268Sscf else 301171268Sscf (void) unsetenv(ss); 302171268Sscf ckfree(ss); 303263777Sjilles INTON; 304171268Sscf 305171268Sscf return; 306171268Sscf} 307171268Sscf 308171268Sscf 309171268Sscf/* 3101556Srgrimes * Same as setvar except that the variable and value are passed in 3111556Srgrimes * the first argument as name=value. Since the first argument will 3121556Srgrimes * be actually stored in the table, it should not be a string that 3131556Srgrimes * will go away. 3141556Srgrimes */ 3151556Srgrimes 3161556Srgrimesvoid 31790111Simpsetvareq(char *s, int flags) 31817987Speter{ 3191556Srgrimes struct var *vp, **vpp; 320221668Sjilles int nlen; 3211556Srgrimes 32245263Scracauer if (aflag) 32345263Scracauer flags |= VEXPORT; 324223024Sjilles if (forcelocal && !(flags & (VNOSET | VNOLOCAL))) 325223024Sjilles mklocal(s); 326221668Sjilles vp = find_var(s, &vpp, &nlen); 327221668Sjilles if (vp != NULL) { 328263846Sjilles if (vp->flags & VREADONLY) { 329263846Sjilles if ((flags & (VTEXTFIXED|VSTACK)) == 0) 330263846Sjilles ckfree(s); 331221668Sjilles error("%.*s: is read only", vp->name_len, s); 332263846Sjilles } 333263847Sjilles if (flags & VNOSET) { 334263847Sjilles if ((flags & (VTEXTFIXED|VSTACK)) == 0) 335263847Sjilles ckfree(s); 336221668Sjilles return; 337263847Sjilles } 338221668Sjilles INTOFF; 33920425Ssteve 340221668Sjilles if (vp->func && (flags & VNOFUNC) == 0) 341221668Sjilles (*vp->func)(s + vp->name_len + 1); 34220425Ssteve 343221668Sjilles if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) 344221668Sjilles ckfree(vp->text); 34520425Ssteve 346221668Sjilles vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); 347221668Sjilles vp->flags |= flags; 348221668Sjilles vp->text = s; 34920425Ssteve 350221668Sjilles /* 351221668Sjilles * We could roll this to a function, to handle it as 352221668Sjilles * a regular variable function callback, but why bother? 353221668Sjilles * 354221668Sjilles * Note: this assumes iflag is not set to 1 initially. 355245689Sjilles * As part of initvar(), this is called before arguments 356221668Sjilles * are looked at. 357221668Sjilles */ 358221668Sjilles if ((vp == &vmpath || (vp == &vmail && ! mpathset())) && 359221668Sjilles iflag == 1) 360221668Sjilles chkmail(1); 361221668Sjilles if ((vp->flags & VEXPORT) && localevar(s)) { 362221668Sjilles change_env(s, 1); 363221668Sjilles (void) setlocale(LC_ALL, ""); 364221668Sjilles updatecharset(); 3651556Srgrimes } 366221668Sjilles INTON; 367221668Sjilles return; 3681556Srgrimes } 3691556Srgrimes /* not found */ 370263847Sjilles if (flags & VNOSET) { 371263847Sjilles if ((flags & (VTEXTFIXED|VSTACK)) == 0) 372263847Sjilles ckfree(s); 373216870Sjilles return; 374263847Sjilles } 375263777Sjilles INTOFF; 3761556Srgrimes vp = ckmalloc(sizeof (*vp)); 3771556Srgrimes vp->flags = flags; 3781556Srgrimes vp->text = s; 379221668Sjilles vp->name_len = nlen; 3801556Srgrimes vp->next = *vpp; 38120425Ssteve vp->func = NULL; 3821556Srgrimes *vpp = vp; 38317525Sache if ((vp->flags & VEXPORT) && localevar(s)) { 384171268Sscf change_env(s, 1); 38517525Sache (void) setlocale(LC_ALL, ""); 386221559Sjilles updatecharset(); 38717525Sache } 38817525Sache INTON; 3891556Srgrimes} 3901556Srgrimes 3911556Srgrimes 3921556Srgrimes 3931556Srgrimes/* 3941556Srgrimes * Process a linked list of variable assignments. 3951556Srgrimes */ 3961556Srgrimes 3971556Srgrimesvoid 398216870Sjilleslistsetvar(struct strlist *list, int flags) 39990111Simp{ 4001556Srgrimes struct strlist *lp; 4011556Srgrimes 4021556Srgrimes INTOFF; 4031556Srgrimes for (lp = list ; lp ; lp = lp->next) { 404216870Sjilles setvareq(savestr(lp->text), flags); 4051556Srgrimes } 4061556Srgrimes INTON; 4071556Srgrimes} 4081556Srgrimes 4091556Srgrimes 4101556Srgrimes 4111556Srgrimes/* 4121556Srgrimes * Find the value of a variable. Returns NULL if not set. 4131556Srgrimes */ 4141556Srgrimes 4151556Srgrimeschar * 416200956Sjilleslookupvar(const char *name) 41790111Simp{ 4181556Srgrimes struct var *v; 4191556Srgrimes 420221668Sjilles v = find_var(name, NULL, NULL); 421221668Sjilles if (v == NULL || v->flags & VUNSET) 422221668Sjilles return NULL; 423221668Sjilles return v->text + v->name_len + 1; 4241556Srgrimes} 4251556Srgrimes 4261556Srgrimes 4271556Srgrimes 4281556Srgrimes/* 4291556Srgrimes * Search the environment of a builtin command. If the second argument 4301556Srgrimes * is nonzero, return the value of a variable even if it hasn't been 4311556Srgrimes * exported. 4321556Srgrimes */ 4331556Srgrimes 4341556Srgrimeschar * 435200956Sjillesbltinlookup(const char *name, int doall) 43617987Speter{ 4371556Srgrimes struct strlist *sp; 4381556Srgrimes struct var *v; 439212467Sjilles char *result; 4401556Srgrimes 441212467Sjilles result = NULL; 4421556Srgrimes for (sp = cmdenviron ; sp ; sp = sp->next) { 4431556Srgrimes if (varequal(sp->text, name)) 444212467Sjilles result = strchr(sp->text, '=') + 1; 4451556Srgrimes } 446212467Sjilles if (result != NULL) 447212467Sjilles return result; 448221668Sjilles 449221668Sjilles v = find_var(name, NULL, NULL); 450221668Sjilles if (v == NULL || v->flags & VUNSET || 451221668Sjilles (!doall && (v->flags & VEXPORT) == 0)) 452221668Sjilles return NULL; 453221668Sjilles return v->text + v->name_len + 1; 4541556Srgrimes} 4551556Srgrimes 4561556Srgrimes 457207678Sjilles/* 458207678Sjilles * Set up locale for a builtin (LANG/LC_* assignments). 459207678Sjilles */ 460207678Sjillesvoid 461207678Sjillesbltinsetlocale(void) 462207678Sjilles{ 463207678Sjilles struct strlist *lp; 464207678Sjilles int act = 0; 465207678Sjilles char *loc, *locdef; 466207678Sjilles int i; 4671556Srgrimes 468207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 469207678Sjilles if (localevar(lp->text)) { 470207678Sjilles act = 1; 471207678Sjilles break; 472207678Sjilles } 473207678Sjilles } 474207678Sjilles if (!act) 475207678Sjilles return; 476207678Sjilles loc = bltinlookup("LC_ALL", 0); 477207678Sjilles INTOFF; 478207678Sjilles if (loc != NULL) { 479207678Sjilles setlocale(LC_ALL, loc); 480207678Sjilles INTON; 481221559Sjilles updatecharset(); 482207678Sjilles return; 483207678Sjilles } 484207678Sjilles locdef = bltinlookup("LANG", 0); 485207678Sjilles for (i = 0; locale_names[i] != NULL; i++) { 486207678Sjilles loc = bltinlookup(locale_names[i], 0); 487207678Sjilles if (loc == NULL) 488207678Sjilles loc = locdef; 489207678Sjilles if (loc != NULL) 490207678Sjilles setlocale(locale_categories[i], loc); 491207678Sjilles } 492207678Sjilles INTON; 493221559Sjilles updatecharset(); 494207678Sjilles} 495207678Sjilles 4961556Srgrimes/* 497207678Sjilles * Undo the effect of bltinlocaleset(). 498207678Sjilles */ 499207678Sjillesvoid 500207678Sjillesbltinunsetlocale(void) 501207678Sjilles{ 502207678Sjilles struct strlist *lp; 503207678Sjilles 504207678Sjilles INTOFF; 505207678Sjilles for (lp = cmdenviron ; lp ; lp = lp->next) { 506207678Sjilles if (localevar(lp->text)) { 507207678Sjilles setlocale(LC_ALL, ""); 508221559Sjilles updatecharset(); 509207678Sjilles return; 510207678Sjilles } 511207678Sjilles } 512207678Sjilles INTON; 513207678Sjilles} 514207678Sjilles 515221559Sjilles/* 516221559Sjilles * Update the localeisutf8 flag. 517221559Sjilles */ 518221559Sjillesvoid 519221559Sjillesupdatecharset(void) 520221559Sjilles{ 521221559Sjilles char *charset; 522207678Sjilles 523221559Sjilles charset = nl_langinfo(CODESET); 524221559Sjilles localeisutf8 = !strcmp(charset, "UTF-8"); 525221559Sjilles} 526221559Sjilles 527221669Sjillesvoid 528221669Sjillesinitcharset(void) 529221669Sjilles{ 530221669Sjilles updatecharset(); 531221669Sjilles initial_localeisutf8 = localeisutf8; 532221669Sjilles} 533221669Sjilles 534207678Sjilles/* 5351556Srgrimes * Generate a list of exported variables. This routine is used to construct 5361556Srgrimes * the third argument to execve when executing a program. 5371556Srgrimes */ 5381556Srgrimes 5391556Srgrimeschar ** 54090111Simpenvironment(void) 54190111Simp{ 5421556Srgrimes int nenv; 5431556Srgrimes struct var **vpp; 5441556Srgrimes struct var *vp; 5451556Srgrimes char **env, **ep; 5461556Srgrimes 5471556Srgrimes nenv = 0; 5481556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5491556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5501556Srgrimes if (vp->flags & VEXPORT) 5511556Srgrimes nenv++; 5521556Srgrimes } 5531556Srgrimes ep = env = stalloc((nenv + 1) * sizeof *env); 5541556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 5551556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) 5561556Srgrimes if (vp->flags & VEXPORT) 5571556Srgrimes *ep++ = vp->text; 5581556Srgrimes } 5591556Srgrimes *ep = NULL; 5601556Srgrimes return env; 5611556Srgrimes} 5621556Srgrimes 5631556Srgrimes 564213811Sobrienstatic int 565158145Sstefanfvar_compare(const void *a, const void *b) 566158145Sstefanf{ 567158145Sstefanf const char *const *sa, *const *sb; 5681556Srgrimes 569158145Sstefanf sa = a; 570158145Sstefanf sb = b; 571158145Sstefanf /* 572158145Sstefanf * This compares two var=value strings which creates a different 573158145Sstefanf * order from what you would probably expect. POSIX is somewhat 574158145Sstefanf * ambiguous on what should be sorted exactly. 575158145Sstefanf */ 576158145Sstefanf return strcoll(*sa, *sb); 577158145Sstefanf} 578158145Sstefanf 579158145Sstefanf 5801556Srgrimes/* 581217847Sjilles * Command to list all variables which are set. This is invoked from the 582217847Sjilles * set command when it is called without any options or operands. 5831556Srgrimes */ 5841556Srgrimes 5851556Srgrimesint 58690111Simpshowvarscmd(int argc __unused, char **argv __unused) 58717987Speter{ 5881556Srgrimes struct var **vpp; 5891556Srgrimes struct var *vp; 59097915Stjr const char *s; 591158145Sstefanf const char **vars; 592158145Sstefanf int i, n; 5931556Srgrimes 594158145Sstefanf /* 595158145Sstefanf * POSIX requires us to sort the variables. 596158145Sstefanf */ 597158145Sstefanf n = 0; 598158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 599158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 600158145Sstefanf if (!(vp->flags & VUNSET)) 601158145Sstefanf n++; 6021556Srgrimes } 6031556Srgrimes } 604158145Sstefanf 605231001Sjilles INTOFF; 606158145Sstefanf vars = ckmalloc(n * sizeof(*vars)); 607158145Sstefanf i = 0; 608158145Sstefanf for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { 609158145Sstefanf for (vp = *vpp; vp; vp = vp->next) { 610158145Sstefanf if (!(vp->flags & VUNSET)) 611158145Sstefanf vars[i++] = vp->text; 612158145Sstefanf } 613158145Sstefanf } 614158145Sstefanf 615158145Sstefanf qsort(vars, n, sizeof(*vars), var_compare); 616158145Sstefanf for (i = 0; i < n; i++) { 617223183Sjilles /* 618223183Sjilles * Skip improper variable names so the output remains usable as 619223183Sjilles * shell input. 620223183Sjilles */ 621223183Sjilles if (!isassignment(vars[i])) 622223183Sjilles continue; 623215567Sjilles s = strchr(vars[i], '='); 624215567Sjilles s++; 625215567Sjilles outbin(vars[i], s - vars[i], out1); 626215567Sjilles out1qstr(s); 627158145Sstefanf out1c('\n'); 628158145Sstefanf } 629158145Sstefanf ckfree(vars); 630231001Sjilles INTON; 631158145Sstefanf 6321556Srgrimes return 0; 6331556Srgrimes} 6341556Srgrimes 6351556Srgrimes 6361556Srgrimes 6371556Srgrimes/* 6381556Srgrimes * The export and readonly commands. 6391556Srgrimes */ 6401556Srgrimes 6411556Srgrimesint 642240541Sjillesexportcmd(int argc __unused, char **argv) 64317987Speter{ 6441556Srgrimes struct var **vpp; 6451556Srgrimes struct var *vp; 646240541Sjilles char **ap; 6471556Srgrimes char *name; 6481556Srgrimes char *p; 64997914Stjr char *cmdname; 65097914Stjr int ch, values; 6511556Srgrimes int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; 6521556Srgrimes 65397914Stjr cmdname = argv[0]; 65497914Stjr values = 0; 655240541Sjilles while ((ch = nextopt("p")) != '\0') { 65697914Stjr switch (ch) { 65797914Stjr case 'p': 65897914Stjr values = 1; 65997914Stjr break; 66097914Stjr } 66197914Stjr } 66297914Stjr 663240541Sjilles if (values && *argptr != NULL) 664149919Sstefanf error("-p requires no arguments"); 665240541Sjilles if (*argptr != NULL) { 666240541Sjilles for (ap = argptr; (name = *ap) != NULL; ap++) { 6671556Srgrimes if ((p = strchr(name, '=')) != NULL) { 6681556Srgrimes p++; 6691556Srgrimes } else { 670221668Sjilles vp = find_var(name, NULL, NULL); 671221668Sjilles if (vp != NULL) { 672221668Sjilles vp->flags |= flag; 673221668Sjilles if ((vp->flags & VEXPORT) && localevar(vp->text)) { 674221668Sjilles change_env(vp->text, 1); 675221668Sjilles (void) setlocale(LC_ALL, ""); 676221668Sjilles updatecharset(); 6771556Srgrimes } 678221668Sjilles continue; 6791556Srgrimes } 6801556Srgrimes } 6811556Srgrimes setvar(name, p, flag); 6821556Srgrimes } 6831556Srgrimes } else { 6841556Srgrimes for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { 6851556Srgrimes for (vp = *vpp ; vp ; vp = vp->next) { 6861556Srgrimes if (vp->flags & flag) { 68797914Stjr if (values) { 688223183Sjilles /* 689223183Sjilles * Skip improper variable names 690223183Sjilles * so the output remains usable 691223183Sjilles * as shell input. 692223183Sjilles */ 693223183Sjilles if (!isassignment(vp->text)) 694223183Sjilles continue; 69597914Stjr out1str(cmdname); 69697914Stjr out1c(' '); 69797914Stjr } 69897914Stjr if (values && !(vp->flags & VUNSET)) { 699221975Sjilles outbin(vp->text, 700221975Sjilles vp->name_len + 1, out1); 701221975Sjilles out1qstr(vp->text + 702221975Sjilles vp->name_len + 1); 703215567Sjilles } else 704221975Sjilles outbin(vp->text, vp->name_len, 705215567Sjilles out1); 7061556Srgrimes out1c('\n'); 7071556Srgrimes } 7081556Srgrimes } 7091556Srgrimes } 7101556Srgrimes } 7111556Srgrimes return 0; 7121556Srgrimes} 7131556Srgrimes 7141556Srgrimes 7151556Srgrimes/* 7161556Srgrimes * The "local" command. 7171556Srgrimes */ 7181556Srgrimes 71917987Speterint 72090111Simplocalcmd(int argc __unused, char **argv __unused) 72117987Speter{ 7221556Srgrimes char *name; 7231556Srgrimes 724254339Sjilles nextopt(""); 7251556Srgrimes if (! in_function()) 7261556Srgrimes error("Not in a function"); 7271556Srgrimes while ((name = *argptr++) != NULL) { 7281556Srgrimes mklocal(name); 7291556Srgrimes } 7301556Srgrimes return 0; 7311556Srgrimes} 7321556Srgrimes 7331556Srgrimes 7341556Srgrimes/* 7351556Srgrimes * Make a variable a local variable. When a variable is made local, it's 7361556Srgrimes * value and flags are saved in a localvar structure. The saved values 7371556Srgrimes * will be restored when the shell function returns. We handle the name 7381556Srgrimes * "-" as a special case. 7391556Srgrimes */ 7401556Srgrimes 7411556Srgrimesvoid 74290111Simpmklocal(char *name) 74390111Simp{ 7441556Srgrimes struct localvar *lvp; 7451556Srgrimes struct var **vpp; 7461556Srgrimes struct var *vp; 7471556Srgrimes 7481556Srgrimes INTOFF; 7491556Srgrimes lvp = ckmalloc(sizeof (struct localvar)); 7501556Srgrimes if (name[0] == '-' && name[1] == '\0') { 7511556Srgrimes lvp->text = ckmalloc(sizeof optlist); 75217987Speter memcpy(lvp->text, optlist, sizeof optlist); 7531556Srgrimes vp = NULL; 7541556Srgrimes } else { 755221668Sjilles vp = find_var(name, &vpp, NULL); 7561556Srgrimes if (vp == NULL) { 7571556Srgrimes if (strchr(name, '=')) 758223024Sjilles setvareq(savestr(name), VSTRFIXED | VNOLOCAL); 7591556Srgrimes else 760223024Sjilles setvar(name, NULL, VSTRFIXED | VNOLOCAL); 7611556Srgrimes vp = *vpp; /* the new variable */ 7621556Srgrimes lvp->text = NULL; 7631556Srgrimes lvp->flags = VUNSET; 7641556Srgrimes } else { 7651556Srgrimes lvp->text = vp->text; 7661556Srgrimes lvp->flags = vp->flags; 7671556Srgrimes vp->flags |= VSTRFIXED|VTEXTFIXED; 768221668Sjilles if (name[vp->name_len] == '=') 769223024Sjilles setvareq(savestr(name), VNOLOCAL); 7701556Srgrimes } 7711556Srgrimes } 7721556Srgrimes lvp->vp = vp; 7731556Srgrimes lvp->next = localvars; 7741556Srgrimes localvars = lvp; 7751556Srgrimes INTON; 7761556Srgrimes} 7771556Srgrimes 7781556Srgrimes 7791556Srgrimes/* 7801556Srgrimes * Called after a function returns. 7811556Srgrimes */ 7821556Srgrimes 7831556Srgrimesvoid 78490111Simppoplocalvars(void) 78590111Simp{ 7861556Srgrimes struct localvar *lvp; 7871556Srgrimes struct var *vp; 7881556Srgrimes 789263777Sjilles INTOFF; 7901556Srgrimes while ((lvp = localvars) != NULL) { 7911556Srgrimes localvars = lvp->next; 7921556Srgrimes vp = lvp->vp; 7931556Srgrimes if (vp == NULL) { /* $- saved */ 79417987Speter memcpy(optlist, lvp->text, sizeof optlist); 7951556Srgrimes ckfree(lvp->text); 796215266Sjilles optschanged(); 7971556Srgrimes } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { 7981556Srgrimes (void)unsetvar(vp->text); 7991556Srgrimes } else { 8001556Srgrimes if ((vp->flags & VTEXTFIXED) == 0) 8011556Srgrimes ckfree(vp->text); 8021556Srgrimes vp->flags = lvp->flags; 8031556Srgrimes vp->text = lvp->text; 8041556Srgrimes } 8051556Srgrimes ckfree(lvp); 8061556Srgrimes } 807263777Sjilles INTON; 8081556Srgrimes} 8091556Srgrimes 8101556Srgrimes 81117987Speterint 81290111Simpsetvarcmd(int argc, char **argv) 81317987Speter{ 8141556Srgrimes if (argc <= 2) 8151556Srgrimes return unsetcmd(argc, argv); 8161556Srgrimes else if (argc == 3) 8171556Srgrimes setvar(argv[1], argv[2], 0); 8181556Srgrimes else 819214538Sjilles error("too many arguments"); 8201556Srgrimes return 0; 8211556Srgrimes} 8221556Srgrimes 8231556Srgrimes 8241556Srgrimes/* 825217847Sjilles * The unset builtin command. 8261556Srgrimes */ 8271556Srgrimes 82817987Speterint 82990111Simpunsetcmd(int argc __unused, char **argv __unused) 83017987Speter{ 8311556Srgrimes char **ap; 8321556Srgrimes int i; 8331556Srgrimes int flg_func = 0; 8341556Srgrimes int flg_var = 0; 8351556Srgrimes int ret = 0; 8361556Srgrimes 8371556Srgrimes while ((i = nextopt("vf")) != '\0') { 8381556Srgrimes if (i == 'f') 8391556Srgrimes flg_func = 1; 8401556Srgrimes else 8411556Srgrimes flg_var = 1; 8421556Srgrimes } 8431556Srgrimes if (flg_func == 0 && flg_var == 0) 8441556Srgrimes flg_var = 1; 8458855Srgrimes 846263777Sjilles INTOFF; 8471556Srgrimes for (ap = argptr; *ap ; ap++) { 8481556Srgrimes if (flg_func) 8491556Srgrimes ret |= unsetfunc(*ap); 8501556Srgrimes if (flg_var) 8511556Srgrimes ret |= unsetvar(*ap); 8521556Srgrimes } 853263777Sjilles INTON; 8541556Srgrimes return ret; 8551556Srgrimes} 8561556Srgrimes 8571556Srgrimes 8581556Srgrimes/* 8591556Srgrimes * Unset the specified variable. 860263777Sjilles * Called with interrupts off. 8611556Srgrimes */ 8621556Srgrimes 86320425Ssteveint 864200956Sjillesunsetvar(const char *s) 86590111Simp{ 8661556Srgrimes struct var **vpp; 8671556Srgrimes struct var *vp; 8681556Srgrimes 869221668Sjilles vp = find_var(s, &vpp, NULL); 870221668Sjilles if (vp == NULL) 871221668Sjilles return (0); 872221668Sjilles if (vp->flags & VREADONLY) 873221668Sjilles return (1); 874221668Sjilles if (vp->text[vp->name_len + 1] != '\0') 875221668Sjilles setvar(s, nullstr, 0); 876221668Sjilles if ((vp->flags & VEXPORT) && localevar(vp->text)) { 877221668Sjilles change_env(s, 0); 878221668Sjilles setlocale(LC_ALL, ""); 879221668Sjilles updatecharset(); 8801556Srgrimes } 881221668Sjilles vp->flags &= ~VEXPORT; 882221668Sjilles vp->flags |= VUNSET; 883221668Sjilles if ((vp->flags & VSTRFIXED) == 0) { 884221668Sjilles if ((vp->flags & VTEXTFIXED) == 0) 885221668Sjilles ckfree(vp->text); 886221668Sjilles *vpp = vp->next; 887221668Sjilles ckfree(vp); 888221668Sjilles } 889135856Sdes return (0); 8901556Srgrimes} 8911556Srgrimes 8921556Srgrimes 8931556Srgrimes 8941556Srgrimes/* 895250422Seadler * Returns true if the two strings specify the same variable. The first 8961556Srgrimes * variable name is terminated by '='; the second may be terminated by 8971556Srgrimes * either '=' or '\0'. 8981556Srgrimes */ 8991556Srgrimes 900213811Sobrienstatic int 901200956Sjillesvarequal(const char *p, const char *q) 90290111Simp{ 9031556Srgrimes while (*p == *q++) { 9041556Srgrimes if (*p++ == '=') 9051556Srgrimes return 1; 9061556Srgrimes } 9071556Srgrimes if (*p == '=' && *(q - 1) == '\0') 9081556Srgrimes return 1; 9091556Srgrimes return 0; 9101556Srgrimes} 911221668Sjilles 912221668Sjilles/* 913221668Sjilles * Search for a variable. 914221668Sjilles * 'name' may be terminated by '=' or a NUL. 915221668Sjilles * vppp is set to the pointer to vp, or the list head if vp isn't found 916250422Seadler * lenp is set to the number of characters in 'name' 917221668Sjilles */ 918221668Sjilles 919221668Sjillesstatic struct var * 920221668Sjillesfind_var(const char *name, struct var ***vppp, int *lenp) 921221668Sjilles{ 922221668Sjilles unsigned int hashval; 923221668Sjilles int len; 924221668Sjilles struct var *vp, **vpp; 925221668Sjilles const char *p = name; 926221668Sjilles 927221668Sjilles hashval = 0; 928221668Sjilles while (*p && *p != '=') 929221668Sjilles hashval = 2 * hashval + (unsigned char)*p++; 930221668Sjilles len = p - name; 931221668Sjilles 932221668Sjilles if (lenp) 933221668Sjilles *lenp = len; 934221668Sjilles vpp = &vartab[hashval % VTABSIZE]; 935221668Sjilles if (vppp) 936221668Sjilles *vppp = vpp; 937221668Sjilles 938221668Sjilles for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { 939221668Sjilles if (vp->name_len != len) 940221668Sjilles continue; 941221668Sjilles if (memcmp(vp->text, name, len) != 0) 942221668Sjilles continue; 943221668Sjilles if (vppp) 944221668Sjilles *vppp = vpp; 945221668Sjilles return vp; 946221668Sjilles } 947221668Sjilles return NULL; 948221668Sjilles} 949