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Diffstat (limited to 'bin/sh/var.c')
| -rw-r--r-- | bin/sh/var.c | 1587 |
1 files changed, 0 insertions, 1587 deletions
diff --git a/bin/sh/var.c b/bin/sh/var.c deleted file mode 100644 index 378598c..0000000 --- a/bin/sh/var.c +++ /dev/null @@ -1,1587 +0,0 @@ -/* $NetBSD: var.c,v 1.75 2019/01/21 13:27:29 kre Exp $ */ - -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Kenneth Almquist. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -#ifndef lint -#if 0 -static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95"; -#else -__RCSID("$NetBSD: var.c,v 1.75 2019/01/21 13:27:29 kre Exp $"); -#endif -#endif /* not lint */ - -#include <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <string.h> -#include <paths.h> -#include <limits.h> -#include <time.h> -#include <pwd.h> -#include <fcntl.h> -#include <inttypes.h> - -/* - * Shell variables. - */ - -#include "shell.h" -#include "output.h" -#include "expand.h" -#include "nodes.h" /* for other headers */ -#include "eval.h" /* defines cmdenviron */ -#include "exec.h" -#include "syntax.h" -#include "options.h" -#include "builtins.h" -#include "mail.h" -#include "var.h" -#include "memalloc.h" -#include "error.h" -#include "mystring.h" -#include "parser.h" -#include "show.h" -#include "machdep.h" -#ifndef SMALL -#include "myhistedit.h" -#endif - -#ifdef SMALL -#define VTABSIZE 39 -#else -#define VTABSIZE 517 -#endif - - -struct varinit { - struct var *var; - int flags; - const char *text; - union var_func_union v_u; -}; -#define func v_u.set_func -#define rfunc v_u.ref_func - -char *get_lineno(struct var *); - -#ifndef SMALL -char *get_tod(struct var *); -char *get_hostname(struct var *); -char *get_seconds(struct var *); -char *get_euser(struct var *); -char *get_random(struct var *); -#endif - -struct localvar *localvars; - -#ifndef SMALL -struct var vhistsize; -struct var vterm; -struct var editrc; -struct var ps_lit; -#endif -struct var vifs; -struct var vmail; -struct var vmpath; -struct var vpath; -struct var vps1; -struct var vps2; -struct var vps4; -struct var vvers; -struct var voptind; -struct var line_num; -#ifndef SMALL -struct var tod; -struct var host_name; -struct var seconds; -struct var euname; -struct var random_num; - -intmax_t sh_start_time; -#endif - -struct var line_num; -int line_number; -int funclinebase = 0; -int funclineabs = 0; - -char ifs_default[] = " \t\n"; - -const struct varinit varinit[] = { -#ifndef SMALL - { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=", - { .set_func= sethistsize } }, -#endif - { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n", - { NULL } }, - { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=", - { NULL } }, - { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=", - { NULL } }, - { &vvers, VSTRFIXED|VTEXTFIXED|VNOEXPORT, "NETBSD_SHELL=", - { NULL } }, - { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=" _PATH_DEFPATH, - { .set_func= changepath } }, - /* - * vps1 depends on uid - */ - { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ", - { NULL } }, - { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ", - { NULL } }, -#ifndef SMALL - { &vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM=", - { .set_func= setterm } }, - { &editrc, VSTRFIXED|VTEXTFIXED|VUNSET, "EDITRC=", - { .set_func= set_editrc } }, - { &ps_lit, VSTRFIXED|VTEXTFIXED|VUNSET, "PSlit=", - { .set_func= set_prompt_lit } }, -#endif - { &voptind, VSTRFIXED|VTEXTFIXED|VNOFUNC, "OPTIND=1", - { .set_func= getoptsreset } }, - { &line_num, VSTRFIXED|VTEXTFIXED|VFUNCREF|VSPECIAL, "LINENO=1", - { .ref_func= get_lineno } }, -#ifndef SMALL - { &tod, VSTRFIXED|VTEXTFIXED|VFUNCREF, "ToD=", - { .ref_func= get_tod } }, - { &host_name, VSTRFIXED|VTEXTFIXED|VFUNCREF, "HOSTNAME=", - { .ref_func= get_hostname } }, - { &seconds, VSTRFIXED|VTEXTFIXED|VFUNCREF, "SECONDS=", - { .ref_func= get_seconds } }, - { &euname, VSTRFIXED|VTEXTFIXED|VFUNCREF, "EUSER=", - { .ref_func= get_euser } }, - { &random_num, VSTRFIXED|VTEXTFIXED|VFUNCREF|VSPECIAL, "RANDOM=", - { .ref_func= get_random } }, -#endif - { NULL, 0, NULL, - { NULL } } -}; - -struct var *vartab[VTABSIZE]; - -STATIC int strequal(const char *, const char *); -STATIC struct var *find_var(const char *, struct var ***, int *); -STATIC void showvar(struct var *, const char *, const char *, int); -static void export_usage(const char *) __dead; - -/* - * Initialize the varable symbol tables and import the environment - */ - -#ifdef mkinit -INCLUDE <stdio.h> -INCLUDE <unistd.h> -INCLUDE <time.h> -INCLUDE "var.h" -INCLUDE "version.h" -MKINIT char **environ; -INIT { - char **envp; - char buf[64]; - -#ifndef SMALL - sh_start_time = (intmax_t)time((time_t *)0); -#endif - /* - * Set up our default variables and their values. - */ - initvar(); - - /* - * Import variables from the environment, which will - * override anything initialised just previously. - */ - for (envp = environ ; *envp ; envp++) { - if (strchr(*envp, '=')) { - setvareq(*envp, VEXPORT|VTEXTFIXED); - } - } - - /* - * Set variables which override anything read from environment. - * - * PPID is readonly - * Always default IFS - * POSIX: "Whenever the shell is invoked, OPTIND shall - * be initialized to 1." - * PSc indicates the root/non-root status of this shell. - * START_TIME belongs only to this shell. - * NETBSD_SHELL is a constant (readonly), and is never exported - * LINENO is simply magic... - */ - snprintf(buf, sizeof(buf), "%d", (int)getppid()); - setvar("PPID", buf, VREADONLY); - setvar("IFS", ifs_default, VTEXTFIXED); - setvar("OPTIND", "1", VTEXTFIXED); - setvar("PSc", (geteuid() == 0 ? "#" : "$"), VTEXTFIXED); - -#ifndef SMALL - snprintf(buf, sizeof(buf), "%jd", sh_start_time); - setvar("START_TIME", buf, VTEXTFIXED); -#endif - - setvar("NETBSD_SHELL", NETBSD_SHELL -#ifdef BUILD_DATE - " BUILD:" BUILD_DATE -#endif -#ifdef DEBUG - " DEBUG" -#endif -#if !defined(JOBS) || JOBS == 0 - " -JOBS" -#endif -#ifndef DO_SHAREDVFORK - " -VFORK" -#endif -#ifdef SMALL - " SMALL" -#endif -#ifdef TINY - " TINY" -#endif -#ifdef OLD_TTY_DRIVER - " OLD_TTY" -#endif -#ifdef SYSV - " SYSV" -#endif -#ifndef BSD - " -BSD" -#endif -#ifdef BOGUS_NOT_COMMAND - " BOGUS_NOT" -#endif - , VTEXTFIXED|VREADONLY|VNOEXPORT); - - setvar("LINENO", "1", VTEXTFIXED); -} -#endif - - -/* - * This routine initializes the builtin variables. It is called when the - * shell is initialized and again when a shell procedure is spawned. - */ - -void -initvar(void) -{ - const struct varinit *ip; - struct var *vp; - struct var **vpp; - - for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { - if (find_var(ip->text, &vpp, &vp->name_len) != NULL) - continue; - vp->next = *vpp; - *vpp = vp; - vp->text = strdup(ip->text); - vp->flags = (ip->flags & ~VTEXTFIXED) | VSTRFIXED; - vp->v_u = ip->v_u; - } - /* - * PS1 depends on uid - */ - if (find_var("PS1", &vpp, &vps1.name_len) == NULL) { - vps1.next = *vpp; - *vpp = &vps1; - vps1.flags = VSTRFIXED; - vps1.text = NULL; - choose_ps1(); - } -} - -void -choose_ps1(void) -{ - uid_t u = geteuid(); - - if ((vps1.flags & (VTEXTFIXED|VSTACK)) == 0) - free(vps1.text); - vps1.text = strdup(u != 0 ? "PS1=$ " : "PS1=# "); - vps1.flags &= ~(VTEXTFIXED|VSTACK); - - /* - * Update PSc whenever we feel the need to update PS1 - */ - setvarsafe("PSc", (u == 0 ? "#" : "$"), 0); -} - -/* - * Validate a string as a valid variable name - * nb: not parameter - special params and such are "invalid" here. - * Name terminated by either \0 or the term param (usually '=' or '\0'). - * - * If not NULL, the length of the (intended) name is returned via len - */ - -int -validname(const char *name, int term, int *len) -{ - const char *p = name; - int ok = 1; - - if (p == NULL || *p == '\0' || *p == term) { - if (len != NULL) - *len = 0; - return 0; - } - - if (!is_name(*p)) - ok = 0; - p++; - for (;;) { - if (*p == '\0' || *p == term) - break; - if (!is_in_name(*p)) - ok = 0; - p++; - } - if (len != NULL) - *len = p - name; - - return ok; -} - -/* - * Safe version of setvar, returns 1 on success 0 on failure. - */ - -int -setvarsafe(const char *name, const char *val, int flags) -{ - struct jmploc jmploc; - struct jmploc * const savehandler = handler; - int volatile err = 0; - - if (setjmp(jmploc.loc)) - err = 1; - else { - handler = &jmploc; - setvar(name, val, flags); - } - handler = savehandler; - return err; -} - -/* - * Set the value of a variable. The flags argument is ored with the - * flags of the variable. If val is NULL, the variable is unset. - * - * This always copies name and val when setting a variable, so - * the source strings can be from anywhere, and are no longer needed - * after this function returns. The VTEXTFIXED and VSTACK flags should - * not be used (but just in case they were, clear them.) - */ - -void -setvar(const char *name, const char *val, int flags) -{ - const char *p; - const char *q; - char *d; - int len; - int namelen; - char *nameeq; - - p = name; - - if (!validname(p, '=', &namelen)) - error("%.*s: bad variable name", namelen, name); - len = namelen + 2; /* 2 is space for '=' and '\0' */ - if (val == NULL) { - flags |= VUNSET; - } else { - len += strlen(val); - } - d = nameeq = ckmalloc(len); - q = name; - while (--namelen >= 0) - *d++ = *q++; - *d++ = '='; - *d = '\0'; - if (val) - scopy(val, d); - setvareq(nameeq, flags & ~(VTEXTFIXED | VSTACK)); -} - - - -/* - * Same as setvar except that the variable and value are passed in - * the first argument as name=value. Since the first argument will - * be actually stored in the table, it should not be a string that - * will go away. The flags (VTEXTFIXED or VSTACK) can be used to - * indicate the source of the string (if neither is set, the string will - * eventually be free()d when a replacement value is assigned.) - */ - -void -setvareq(char *s, int flags) -{ - struct var *vp, **vpp; - int nlen; - - VTRACE(DBG_VARS, ("setvareq([%s],%#x) aflag=%d ", s, flags, aflag)); - if (aflag && !(flags & VNOEXPORT)) - flags |= VEXPORT; - vp = find_var(s, &vpp, &nlen); - if (vp != NULL) { - VTRACE(DBG_VARS, ("was [%s] fl:%#x\n", vp->text, - vp->flags)); - if (vp->flags & VREADONLY) { - if ((flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(s); - if (flags & VNOERROR) - return; - error("%.*s: is read only", vp->name_len, vp->text); - } - if (flags & VNOSET) { - if ((flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(s); - return; - } - - INTOFF; - - if (vp->func && !(vp->flags & VFUNCREF) && !(flags & VNOFUNC)) - (*vp->func)(s + vp->name_len + 1); - - if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); - - /* - * if we set a magic var, the magic dissipates, - * unless it is very special indeed. - */ - if (vp->rfunc && (vp->flags & (VFUNCREF|VSPECIAL)) == VFUNCREF) - vp->rfunc = NULL; - - vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); - if (flags & VNOEXPORT) - vp->flags &= ~VEXPORT; - if (flags & VDOEXPORT) - vp->flags &= ~VNOEXPORT; - if (vp->flags & VNOEXPORT) - flags &= ~VEXPORT; - vp->flags |= flags & ~(VNOFUNC | VDOEXPORT); - vp->text = s; - - /* - * We could roll this to a function, to handle it as - * a regular variable function callback, but why bother? - */ - if (vp == &vmpath || (vp == &vmail && ! mpathset())) - chkmail(1); - - INTON; - return; - } - /* not found */ - if (flags & VNOSET) { - VTRACE(DBG_VARS, ("new noset\n")); - if ((flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(s); - return; - } - vp = ckmalloc(sizeof (*vp)); - vp->flags = flags & ~(VNOFUNC|VFUNCREF|VDOEXPORT); - vp->text = s; - vp->name_len = nlen; - vp->func = NULL; - vp->next = *vpp; - *vpp = vp; - - VTRACE(DBG_VARS, ("new [%s] (%d) %#x\n", s, nlen, vp->flags)); -} - - - -/* - * Process a linked list of variable assignments. - */ - -void -listsetvar(struct strlist *list, int flags) -{ - struct strlist *lp; - - INTOFF; - for (lp = list ; lp ; lp = lp->next) { - setvareq(savestr(lp->text), flags); - } - INTON; -} - -void -listmklocal(struct strlist *list, int flags) -{ - struct strlist *lp; - - for (lp = list ; lp ; lp = lp->next) - mklocal(lp->text, flags); -} - - -/* - * Find the value of a variable. Returns NULL if not set. - */ - -char * -lookupvar(const char *name) -{ - struct var *v; - - v = find_var(name, NULL, NULL); - if (v == NULL || v->flags & VUNSET) - return NULL; - if (v->rfunc && (v->flags & VFUNCREF) != 0) - return (*v->rfunc)(v) + v->name_len + 1; - return v->text + v->name_len + 1; -} - - - -/* - * Search the environment of a builtin command. If the second argument - * is nonzero, return the value of a variable even if it hasn't been - * exported. - */ - -char * -bltinlookup(const char *name, int doall) -{ - struct strlist *sp; - struct var *v; - - for (sp = cmdenviron ; sp ; sp = sp->next) { - if (strequal(sp->text, name)) - return strchr(sp->text, '=') + 1; - } - - v = find_var(name, NULL, NULL); - - if (v == NULL || v->flags & VUNSET || (!doall && !(v->flags & VEXPORT))) - return NULL; - if (v->rfunc && (v->flags & VFUNCREF) != 0) - return (*v->rfunc)(v) + v->name_len + 1; - return v->text + v->name_len + 1; -} - - - -/* - * Generate a list of exported variables. This routine is used to construct - * the third argument to execve when executing a program. - */ - -char ** -environment(void) -{ - int nenv; - struct var **vpp; - struct var *vp; - char **env; - char **ep; - - nenv = 0; - for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { - for (vp = *vpp ; vp ; vp = vp->next) - if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT) - nenv++; - } - CTRACE(DBG_VARS, ("environment: %d vars to export\n", nenv)); - ep = env = stalloc((nenv + 1) * sizeof *env); - for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { - for (vp = *vpp ; vp ; vp = vp->next) - if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT) { - if (vp->rfunc && (vp->flags & VFUNCREF)) - *ep++ = (*vp->rfunc)(vp); - else - *ep++ = vp->text; - VTRACE(DBG_VARS, ("environment: %s\n", ep[-1])); - } - } - *ep = NULL; - return env; -} - - -/* - * Called when a shell procedure is invoked to clear out nonexported - * variables. It is also necessary to reallocate variables of with - * VSTACK set since these are currently allocated on the stack. - */ - -#ifdef mkinit -void shprocvar(void); - -SHELLPROC { - shprocvar(); -} -#endif - -void -shprocvar(void) -{ - struct var **vpp; - struct var *vp, **prev; - - for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { - for (prev = vpp ; (vp = *prev) != NULL ; ) { - if ((vp->flags & VEXPORT) == 0) { - *prev = vp->next; - if ((vp->flags & VTEXTFIXED) == 0) - ckfree(vp->text); - if ((vp->flags & VSTRFIXED) == 0) - ckfree(vp); - } else { - if (vp->flags & VSTACK) { - vp->text = savestr(vp->text); - vp->flags &=~ VSTACK; - } - prev = &vp->next; - } - } - } - initvar(); -} - - - -/* - * Command to list all variables which are set. Currently this command - * is invoked from the set command when the set command is called without - * any variables. - */ - -void -print_quoted(const char *p) -{ - const char *q; - - if (p[0] == '\0') { - out1fmt("''"); - return; - } - if (strcspn(p, "|&;<>()$`\\\"' \t\n*?[]#~=%") == strlen(p)) { - out1fmt("%s", p); - return; - } - while (*p) { - if (*p == '\'') { - out1fmt("\\'"); - p++; - continue; - } - q = strchr(p, '\''); - if (!q) { - out1fmt("'%s'", p ); - return; - } - out1fmt("'%.*s'", (int)(q - p), p ); - p = q; - } -} - -static int -sort_var(const void *v_v1, const void *v_v2) -{ - const struct var * const *v1 = v_v1; - const struct var * const *v2 = v_v2; - char *t1 = (*v1)->text, *t2 = (*v2)->text; - - if (*t1 == *t2) { - char *p, *s; - - STARTSTACKSTR(p); - - /* - * note: if lengths are equal, strings must be different - * so we don't care which string we pick for the \0 in - * that case. - */ - if ((strchr(t1, '=') - t1) <= (strchr(t2, '=') - t2)) { - s = t1; - t1 = p; - } else { - s = t2; - t2 = p; - } - - while (*s && *s != '=') { - STPUTC(*s, p); - s++; - } - STPUTC('\0', p); - } - - return strcoll(t1, t2); -} - -/* - * POSIX requires that 'set' (but not export or readonly) output the - * variables in lexicographic order - by the locale's collating order (sigh). - * Maybe we could keep them in an ordered balanced binary tree - * instead of hashed lists. - * For now just roll 'em through qsort for printing... - */ - -STATIC void -showvar(struct var *vp, const char *cmd, const char *xtra, int show_value) -{ - const char *p; - - if (cmd) - out1fmt("%s ", cmd); - if (xtra) - out1fmt("%s ", xtra); - p = vp->text; - if (vp->rfunc && (vp->flags & VFUNCREF) != 0) { - p = (*vp->rfunc)(vp); - if (p == NULL) - p = vp->text; - } - for ( ; *p != '=' ; p++) - out1c(*p); - if (!(vp->flags & VUNSET) && show_value) { - out1fmt("="); - print_quoted(++p); - } - out1c('\n'); -} - -int -showvars(const char *cmd, int flag, int show_value, const char *xtra) -{ - struct var **vpp; - struct var *vp; - - static struct var **list; /* static in case we are interrupted */ - static int list_len; - int count = 0; - - if (!list) { - list_len = 32; - list = ckmalloc(list_len * sizeof *list); - } - - for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { - for (vp = *vpp ; vp ; vp = vp->next) { - if (flag && !(vp->flags & flag)) - continue; - if (vp->flags & VUNSET && !(show_value & 2)) - continue; - if (count >= list_len) { - list = ckrealloc(list, - (list_len << 1) * sizeof *list); - list_len <<= 1; - } - list[count++] = vp; - } - } - - qsort(list, count, sizeof *list, sort_var); - - for (vpp = list; count--; vpp++) - showvar(*vpp, cmd, xtra, show_value); - - /* no free(list), will be used again next time ... */ - - return 0; -} - - - -/* - * The export and readonly commands. - */ - -static void __dead -export_usage(const char *cmd) -{ -#ifdef SMALL - if (*cmd == 'r') - error("Usage: %s [ -p | var[=val]... ]", cmd); - else - error("Usage: %s [ -p | [-n] var[=val]... ]", cmd); -#else - if (*cmd == 'r') - error("Usage: %s [-p [var...] | -q var... | var[=val]... ]", cmd); - else - error( - "Usage: %s [ -px [var...] | -q[x] var... | [-n|x] var[=val]... ]", - cmd); -#endif -} - -int -exportcmd(int argc, char **argv) -{ - struct var *vp; - char *name; - const char *p = argv[0]; - int flag = p[0] == 'r'? VREADONLY : VEXPORT; - int pflg = 0; - int nflg = 0; -#ifndef SMALL - int xflg = 0; - int qflg = 0; -#endif - int res; - int c; - int f; - -#ifdef SMALL -#define EXPORT_OPTS "np" -#else -#define EXPORT_OPTS "npqx" -#endif - - while ((c = nextopt(EXPORT_OPTS)) != '\0') { - -#undef EXPORT_OPTS - - switch (c) { - case 'n': - if (pflg || flag == VREADONLY -#ifndef SMALL - || qflg || xflg -#endif - ) - export_usage(p); - nflg = 1; - break; - case 'p': - if (nflg -#ifndef SMALL - || qflg -#endif - ) - export_usage(p); - pflg = 3; - break; -#ifndef SMALL - case 'q': - if (nflg || pflg) - export_usage(p); - qflg = 1; - break; - case 'x': - if (nflg || flag == VREADONLY) - export_usage(p); - flag = VNOEXPORT; - xflg = 1; - break; -#endif - } - } - - if ((nflg -#ifndef SMALL - || qflg -#endif - ) && *argptr == NULL) - export_usage(p); - -#ifndef SMALL - if (pflg && *argptr != NULL) { - while ((name = *argptr++) != NULL) { - int len; - - vp = find_var(name, NULL, &len); - if (name[len] == '=') - export_usage(p); - if (!goodname(name)) - error("%s: bad variable name", name); - - if (vp && vp->flags & flag) - showvar(vp, p, xflg ? "-x" : NULL, 1); - } - return 0; - } -#endif - - if (pflg || *argptr == NULL) - return showvars( pflg ? p : 0, flag, pflg, -#ifndef SMALL - pflg && xflg ? "-x" : -#endif - NULL ); - - res = 0; -#ifndef SMALL - if (qflg) { - while ((name = *argptr++) != NULL) { - int len; - - vp = find_var(name, NULL, &len); - if (name[len] == '=') - export_usage(p); - if (!goodname(name)) - error("%s: bad variable name", name); - - if (vp == NULL || !(vp->flags & flag)) - res = 1; - } - return res; - } -#endif - - while ((name = *argptr++) != NULL) { - int len; - - f = flag; - - vp = find_var(name, NULL, &len); - p = name + len; - if (*p++ != '=') - p = NULL; - - if (vp != NULL) { - if (nflg) - vp->flags &= ~flag; - else if (flag&VEXPORT && vp->flags&VNOEXPORT) { - /* note we go ahead and do any assignment */ - sh_warnx("%.*s: not available for export", - len, name); - res = 1; - } else { - if (flag == VNOEXPORT) - vp->flags &= ~VEXPORT; - - /* if not NULL will be done in setvar below */ - if (p == NULL) - vp->flags |= flag; - } - if (p == NULL) - continue; - } else if (nflg && p == NULL && !goodname(name)) - error("%s: bad variable name", name); - - if (!nflg || p != NULL) - setvar(name, p, f); - } - return res; -} - - -/* - * The "local" command. - */ - -int -localcmd(int argc, char **argv) -{ - char *name; - int c; - int flags = 0; /*XXX perhaps VUNSET from a -o option value */ - - if (! in_function()) - error("Not in a function"); - - /* upper case options, as bash stole all the good ones ... */ - while ((c = nextopt("INx")) != '\0') - switch (c) { - case 'I': flags &= ~VUNSET; break; - case 'N': flags |= VUNSET; break; - case 'x': flags |= VEXPORT; break; - } - - while ((name = *argptr++) != NULL) { - mklocal(name, flags); - } - return 0; -} - - -/* - * Make a variable a local variable. When a variable is made local, its - * value and flags are saved in a localvar structure. The saved values - * will be restored when the shell function returns. We handle the name - * "-" as a special case. - */ - -void -mklocal(const char *name, int flags) -{ - struct localvar *lvp; - struct var **vpp; - struct var *vp; - - INTOFF; - lvp = ckmalloc(sizeof (struct localvar)); - if (name[0] == '-' && name[1] == '\0') { - char *p; - p = ckmalloc(sizeof_optlist); - lvp->text = memcpy(p, optlist, sizeof_optlist); - lvp->rfunc = NULL; - vp = NULL; - xtrace_clone(0); - } else { - vp = find_var(name, &vpp, NULL); - if (vp == NULL) { - flags &= ~VNOEXPORT; - if (strchr(name, '=')) - setvareq(savestr(name), - VSTRFIXED | (flags & ~VUNSET)); - else - setvar(name, NULL, VSTRFIXED|flags); - vp = *vpp; /* the new variable */ - lvp->text = NULL; - lvp->flags = VUNSET; - lvp->rfunc = NULL; - } else { - lvp->text = vp->text; - lvp->flags = vp->flags; - lvp->v_u = vp->v_u; - vp->flags |= VSTRFIXED|VTEXTFIXED; - if (flags & (VDOEXPORT | VUNSET)) - vp->flags &= ~VNOEXPORT; - if (vp->flags & VNOEXPORT && - (flags & (VEXPORT|VDOEXPORT|VUNSET)) == VEXPORT) - flags &= ~VEXPORT; - if (flags & (VNOEXPORT | VUNSET)) - vp->flags &= ~VEXPORT; - flags &= ~VNOEXPORT; - if (name[vp->name_len] == '=') - setvareq(savestr(name), flags & ~VUNSET); - else if (flags & VUNSET) - unsetvar(name, 0); - else - vp->flags |= flags & (VUNSET|VEXPORT); - - if (vp == &line_num) { - if (name[vp->name_len] == '=') - funclinebase = funclineabs -1; - else - funclinebase = 0; - } - } - } - lvp->vp = vp; - lvp->next = localvars; - localvars = lvp; - INTON; -} - - -/* - * Called after a function returns. - */ - -void -poplocalvars(void) -{ - struct localvar *lvp; - struct var *vp; - - while ((lvp = localvars) != NULL) { - localvars = lvp->next; - vp = lvp->vp; - VTRACE(DBG_VARS, ("poplocalvar %s\n", vp ? vp->text : "-")); - if (vp == NULL) { /* $- saved */ - memcpy(optlist, lvp->text, sizeof_optlist); - ckfree(lvp->text); - xtrace_pop(); - optschanged(); - } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { - (void)unsetvar(vp->text, 0); - } else { - if (lvp->func && (lvp->flags & (VNOFUNC|VFUNCREF)) == 0) - (*lvp->func)(lvp->text + vp->name_len + 1); - if ((vp->flags & VTEXTFIXED) == 0) - ckfree(vp->text); - vp->flags = lvp->flags; - vp->text = lvp->text; - vp->v_u = lvp->v_u; - } - ckfree(lvp); - } -} - - -int -setvarcmd(int argc, char **argv) -{ - if (argc <= 2) - return unsetcmd(argc, argv); - else if (argc == 3) - setvar(argv[1], argv[2], 0); - else - error("List assignment not implemented"); - return 0; -} - - -/* - * The unset builtin command. We unset the function before we unset the - * variable to allow a function to be unset when there is a readonly variable - * with the same name. - */ - -int -unsetcmd(int argc, char **argv) -{ - char **ap; - int i; - int flg_func = 0; - int flg_var = 0; - int flg_x = 0; - int ret = 0; - - while ((i = nextopt("efvx")) != '\0') { - switch (i) { - case 'f': - flg_func = 1; - break; - case 'e': - case 'x': - flg_x = (2 >> (i == 'e')); - /* FALLTHROUGH */ - case 'v': - flg_var = 1; - break; - } - } - - if (flg_func == 0 && flg_var == 0) - flg_var = 1; - - for (ap = argptr; *ap ; ap++) { - if (flg_func) - ret |= unsetfunc(*ap); - if (flg_var) - ret |= unsetvar(*ap, flg_x); - } - return ret; -} - - -/* - * Unset the specified variable. - */ - -int -unsetvar(const char *s, int unexport) -{ - struct var **vpp; - struct var *vp; - - vp = find_var(s, &vpp, NULL); - if (vp == NULL) - return 0; - - if (vp->flags & VREADONLY && !(unexport & 1)) - return 1; - - INTOFF; - if (unexport & 1) { - vp->flags &= ~VEXPORT; - } else { - if (vp->text[vp->name_len + 1] != '\0') - setvar(s, nullstr, 0); - if (!(unexport & 2)) - vp->flags &= ~VEXPORT; - vp->flags |= VUNSET; - if ((vp->flags&(VEXPORT|VSTRFIXED|VREADONLY|VNOEXPORT)) == 0) { - if ((vp->flags & VTEXTFIXED) == 0) - ckfree(vp->text); - *vpp = vp->next; - ckfree(vp); - } - } - INTON; - return 0; -} - - -/* - * Returns true if the two strings specify the same varable. The first - * variable name is terminated by '='; the second may be terminated by - * either '=' or '\0'. - */ - -STATIC int -strequal(const char *p, const char *q) -{ - while (*p == *q++) { - if (*p++ == '=') - return 1; - } - if (*p == '=' && *(q - 1) == '\0') - return 1; - return 0; -} - -/* - * Search for a variable. - * 'name' may be terminated by '=' or a NUL. - * vppp is set to the pointer to vp, or the list head if vp isn't found - * lenp is set to the number of characters in 'name' - */ - -STATIC struct var * -find_var(const char *name, struct var ***vppp, int *lenp) -{ - unsigned int hashval; - int len; - struct var *vp, **vpp; - const char *p = name; - - hashval = 0; - while (*p && *p != '=') - hashval = 2 * hashval + (unsigned char)*p++; - - len = p - name; - if (lenp) - *lenp = len; - - vpp = &vartab[hashval % VTABSIZE]; - if (vppp) - *vppp = vpp; - - for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { - if (vp->name_len != len) - continue; - if (memcmp(vp->text, name, len) != 0) - continue; - if (vppp) - *vppp = vpp; - return vp; - } - return NULL; -} - -/* - * The following are the functions that create the values for - * shell variables that are dynamically produced when needed. - * - * The output strings cannot be malloc'd as there is nothing to - * free them - callers assume these are ordinary variables where - * the value returned is vp->text - * - * Each function needs its own storage space, as the results are - * used to create processes' environment, and (if exported) all - * the values will (might) be needed simultaneously. - * - * It is not a problem if a var is updated while nominally in use - * somewhere, all these are intended to be dynamic, the value they - * return is not guaranteed, an updated vaue is just as good. - * - * So, malloc a single buffer for the result of each function, - * grow, and even shrink, it as needed, but once we have one that - * is a suitable size for the actual usage, simply hold it forever. - * - * For a SMALL shell we implement only LINENO, none of the others, - * and give it just a fixed length static buffer for its result. - */ - -#ifndef SMALL - -struct space_reserved { /* record of space allocated for results */ - char *b; - int len; -}; - -/* rough (over-)estimate of the number of bytes needed to hold a number */ -static int -digits_in(intmax_t number) -{ - int res = 0; - - if (number & ~((1LL << 62) - 1)) - res = 64; /* enough for 2^200 and a bit more */ - else if (number & ~((1LL << 32) - 1)) - res = 20; /* enough for 2^64 */ - else if (number & ~((1 << 23) - 1)) - res = 10; /* enough for 2^32 */ - else - res = 8; /* enough for 2^23 or smaller */ - - return res; -} - -static int -make_space(struct space_reserved *m, int bytes) -{ - void *p; - - if (m->len >= bytes && m->len <= (bytes<<2)) - return 1; - - bytes = SHELL_ALIGN(bytes); - /* not ckrealloc() - we want failure, not error() here */ - p = realloc(m->b, bytes); - if (p == NULL) /* what we had should still be there */ - return 0; - - m->b = p; - m->len = bytes; - m->b[bytes - 1] = '\0'; - - return 1; -} -#endif - -char * -get_lineno(struct var *vp) -{ -#ifdef SMALL -#define length (8 + 10) /* 10 digits is enough for a 32 bit line num */ - static char result[length]; -#else - static struct space_reserved buf; -#define result buf.b -#define length buf.len -#endif - int ln = line_number; - - if (vp->flags & VUNSET) - return NULL; - - ln -= funclinebase; - -#ifndef SMALL - if (!make_space(&buf, vp->name_len + 2 + digits_in(ln))) - return vp->text; -#endif - - snprintf(result, length, "%.*s=%d", vp->name_len, vp->text, ln); - return result; -} -#undef result -#undef length - -#ifndef SMALL - -char * -get_hostname(struct var *vp) -{ - static struct space_reserved buf; - - if (vp->flags & VUNSET) - return NULL; - - if (!make_space(&buf, vp->name_len + 2 + 256)) - return vp->text; - - memcpy(buf.b, vp->text, vp->name_len + 1); /* include '=' */ - (void)gethostname(buf.b + vp->name_len + 1, - buf.len - vp->name_len - 3); - return buf.b; -} - -char * -get_tod(struct var *vp) -{ - static struct space_reserved buf; /* space for answers */ - static struct space_reserved tzs; /* remember TZ last used */ - static timezone_t last_zone; /* timezone data for tzs zone */ - const char *fmt; - char *tz; - time_t now; - struct tm tm_now, *tmp; - timezone_t zone = NULL; - static char t_err[] = "time error"; - int len; - - if (vp->flags & VUNSET) - return NULL; - - fmt = lookupvar("ToD_FORMAT"); - if (fmt == NULL) - fmt="%T"; - tz = lookupvar("TZ"); - (void)time(&now); - - if (tz != NULL) { - if (tzs.b == NULL || strcmp(tzs.b, tz) != 0) { - if (make_space(&tzs, strlen(tz) + 1)) { - INTOFF; - strcpy(tzs.b, tz); - if (last_zone) - tzfree(last_zone); - last_zone = zone = tzalloc(tz); - INTON; - } else - zone = tzalloc(tz); - } else - zone = last_zone; - - tmp = localtime_rz(zone, &now, &tm_now); - } else - tmp = localtime_r(&now, &tm_now); - - len = (strlen(fmt) * 4) + vp->name_len + 2; - while (make_space(&buf, len)) { - memcpy(buf.b, vp->text, vp->name_len+1); - if (tmp == NULL) { - if (buf.len >= vp->name_len+2+(int)(sizeof t_err - 1)) { - strcpy(buf.b + vp->name_len + 1, t_err); - if (zone && zone != last_zone) - tzfree(zone); - return buf.b; - } - len = vp->name_len + 4 + sizeof t_err - 1; - continue; - } - if (strftime_z(zone, buf.b + vp->name_len + 1, - buf.len - vp->name_len - 2, fmt, tmp)) { - if (zone && zone != last_zone) - tzfree(zone); - return buf.b; - } - if (len >= 4096) /* Let's be reasonable */ - break; - len <<= 1; - } - if (zone && zone != last_zone) - tzfree(zone); - return vp->text; -} - -char * -get_seconds(struct var *vp) -{ - static struct space_reserved buf; - intmax_t secs; - - if (vp->flags & VUNSET) - return NULL; - - secs = (intmax_t)time((time_t *)0) - sh_start_time; - if (!make_space(&buf, vp->name_len + 2 + digits_in(secs))) - return vp->text; - - snprintf(buf.b, buf.len, "%.*s=%jd", vp->name_len, vp->text, secs); - return buf.b; -} - -char * -get_euser(struct var *vp) -{ - static struct space_reserved buf; - static uid_t lastuid = 0; - uid_t euid; - struct passwd *pw; - - if (vp->flags & VUNSET) - return NULL; - - euid = geteuid(); - if (buf.b != NULL && lastuid == euid) - return buf.b; - - pw = getpwuid(euid); - if (pw == NULL) - return vp->text; - - if (make_space(&buf, vp->name_len + 2 + strlen(pw->pw_name))) { - lastuid = euid; - snprintf(buf.b, buf.len, "%.*s=%s", vp->name_len, vp->text, - pw->pw_name); - return buf.b; - } - - return vp->text; -} - -char * -get_random(struct var *vp) -{ - static struct space_reserved buf; - static intmax_t random_val = 0; - -#ifdef USE_LRAND48 -#define random lrand48 -#define srandom srand48 -#endif - - if (vp->flags & VUNSET) - return NULL; - - if (vp->text != buf.b) { - /* - * Either initialisation, or a new seed has been set - */ - if (vp->text[vp->name_len + 1] == '\0') { - int fd; - - /* - * initialisation (without pre-seeding), - * or explictly requesting a truly random seed. - */ - fd = open("/dev/urandom", 0); - if (fd == -1) { - out2str("RANDOM initialisation failed\n"); - random_val = (getpid()<<3) ^ time((time_t *)0); - } else { - int n; - - do { - n = read(fd,&random_val,sizeof random_val); - } while (n != sizeof random_val); - close(fd); - } - } else - /* good enough for today */ - random_val = strtoimax(vp->text+vp->name_len+1,NULL,0); - - srandom((long)random_val); - } - -#if 0 - random_val = (random_val + 1) & 0x7FFF; /* 15 bit "random" numbers */ -#else - random_val = (random() >> 5) & 0x7FFF; -#endif - - if (!make_space(&buf, vp->name_len + 2 + digits_in(random_val))) - return vp->text; - - snprintf(buf.b, buf.len, "%.*s=%jd", vp->name_len, vp->text, - random_val); - - if (buf.b != vp->text && (vp->flags & (VTEXTFIXED|VSTACK)) == 0) - free(vp->text); - vp->flags |= VTEXTFIXED; - vp->text = buf.b; - - return vp->text; -#undef random -#undef srandom -} - -#endif /* SMALL */ |