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Diffstat (limited to 'bin/dash/src/var.c')
| -rw-r--r-- | bin/dash/src/var.c | 676 |
1 files changed, 0 insertions, 676 deletions
diff --git a/bin/dash/src/var.c b/bin/dash/src/var.c deleted file mode 100644 index ca9504ef..00000000 --- a/bin/dash/src/var.c +++ /dev/null @@ -1,676 +0,0 @@ -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * Copyright (c) 1997-2005 - * Herbert Xu <herbert@gondor.apana.org.au>. 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 <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#ifdef HAVE_PATHS_H -#include <paths.h> -#endif - -/* - * Shell variables. - */ - -#include "shell.h" -#include "output.h" -#include "expand.h" -#include "nodes.h" /* for other headers */ -#include "exec.h" -#include "syntax.h" -#include "options.h" -#include "mail.h" -#include "var.h" -#include "memalloc.h" -#include "error.h" -#include "mystring.h" -#include "parser.h" -#include "show.h" -#ifndef SMALL -#include "myhistedit.h" -#endif -#include "system.h" - - -#define VTABSIZE 39 - - -struct localvar_list { - struct localvar_list *next; - struct localvar *lv; -}; - -MKINIT struct localvar_list *localvar_stack; - -const char defpathvar[] = - "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"; -char defifsvar[] = "IFS= \t\n"; -MKINIT char defoptindvar[] = "OPTIND=1"; - -int lineno; -char linenovar[sizeof("LINENO=")+sizeof(int)*CHAR_BIT/3+1] = "LINENO="; - -/* Some macros in var.h depend on the order, add new variables to the end. */ -struct var varinit[] = { -#if ATTY - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY\0", 0 }, -#endif - { 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail }, - { 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath }, - { 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "RPS1\0", 0 }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "RPS2\0", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, defoptindvar, getoptsreset }, -#ifdef WITH_LINENO - { 0, VSTRFIXED|VTEXTFIXED, linenovar, 0 }, -#endif -#ifndef SMALL - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM\0", 0 }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE\0", sethistsize }, -#endif -}; - -STATIC struct var *vartab[VTABSIZE]; - -STATIC struct var **hashvar(const char *); -STATIC int vpcmp(const void *, const void *); -STATIC struct var **findvar(struct var **, const char *); - -/* - * Initialize the varable symbol tables and import the environment - */ - -#ifdef mkinit -INCLUDE <unistd.h> -INCLUDE <sys/types.h> -INCLUDE <sys/stat.h> -INCLUDE "cd.h" -INCLUDE "output.h" -INCLUDE "var.h" -MKINIT char **environ; -INIT { - char **envp; - static char ppid[32] = "PPID="; - const char *p; - struct stat64 st1, st2; - - initvar(); - for (envp = environ ; *envp ; envp++) { - p = endofname(*envp); - if (p != *envp && *p == '=') { - setvareq(*envp, VEXPORT|VTEXTFIXED); - } - } - - setvareq(defifsvar, VTEXTFIXED); - setvareq(defoptindvar, VTEXTFIXED); - - fmtstr(ppid + 5, sizeof(ppid) - 5, "%ld", (long) getppid()); - setvareq(ppid, VTEXTFIXED); - - p = lookupvar("PWD"); - if (p) - if (*p != '/' || stat64(p, &st1) || stat64(".", &st2) || - st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) - p = 0; - setpwd(p, 0); -} - -RESET { - unwindlocalvars(0); -} -#endif - - -/* - * This routine initializes the builtin variables. It is called when the - * shell is initialized. - */ - -void -initvar(void) -{ - struct var *vp; - struct var *end; - struct var **vpp; - - vp = varinit; - end = vp + sizeof(varinit) / sizeof(varinit[0]); - do { - vpp = hashvar(vp->text); - vp->next = *vpp; - *vpp = vp; - } while (++vp < end); - /* - * PS1 depends on uid - */ - if (!geteuid()) - vps1.text = "PS1=# "; -} - -/* - * 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. - */ - -struct var *setvar(const char *name, const char *val, int flags) -{ - char *p, *q; - size_t namelen; - char *nameeq; - size_t vallen; - struct var *vp; - - q = endofname(name); - p = strchrnul(q, '='); - namelen = p - name; - if (!namelen || p != q) - sh_error("%.*s: bad variable name", namelen, name); - vallen = 0; - if (val == NULL) { - flags |= VUNSET; - } else { - vallen = strlen(val); - } - INTOFF; - p = mempcpy(nameeq = ckmalloc(namelen + vallen + 2), name, namelen); - if (val) { - *p++ = '='; - p = mempcpy(p, val, vallen); - } - *p = '\0'; - vp = setvareq(nameeq, flags | VNOSAVE); - INTON; - - return vp; -} - -/* - * Set the given integer as the value of a variable. The flags argument is - * ored with the flags of the variable. - */ - -intmax_t setvarint(const char *name, intmax_t val, int flags) -{ - int len = max_int_length(sizeof(val)); - char buf[len]; - - fmtstr(buf, len, "%" PRIdMAX, val); - setvar(name, buf, flags); - return val; -} - - - -/* - * 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. - * Called with interrupts off. - */ - -struct var *setvareq(char *s, int flags) -{ - struct var *vp, **vpp; - - vpp = hashvar(s); - flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); - vpp = findvar(vpp, s); - vp = *vpp; - if (vp) { - if (vp->flags & VREADONLY) { - const char *n; - - if (flags & VNOSAVE) - free(s); - n = vp->text; - sh_error("%.*s: is read only", strchrnul(n, '=') - n, - n); - } - - if (flags & VNOSET) - goto out; - - if (vp->func && (flags & VNOFUNC) == 0) - (*vp->func)(strchrnul(s, '=') + 1); - - if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); - - if (((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) | - (vp->flags & VSTRFIXED)) == VUNSET) { - *vpp = vp->next; - ckfree(vp); -out_free: - if ((flags & (VTEXTFIXED|VSTACK|VNOSAVE)) == VNOSAVE) - ckfree(s); - goto out; - } - - flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET); - } else { - if (flags & VNOSET) - goto out; - if ((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) == VUNSET) - goto out_free; - /* not found */ - vp = ckmalloc(sizeof (*vp)); - vp->next = *vpp; - vp->func = NULL; - *vpp = vp; - } - if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE))) - s = savestr(s); - vp->text = s; - vp->flags = flags; - -out: - return vp; -} - -/* - * Find the value of a variable. Returns NULL if not set. - */ - -char * -lookupvar(const char *name) -{ - struct var *v; - - if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) { -#ifdef WITH_LINENO - if (v == &vlineno && v->text == linenovar) { - fmtstr(linenovar+7, sizeof(linenovar)-7, "%d", lineno); - } -#endif - return strchrnul(v->text, '=') + 1; - } - return NULL; -} - -intmax_t lookupvarint(const char *name) -{ - return atomax(lookupvar(name) ?: nullstr, 0); -} - - - -/* - * Generate a list of variables satisfying the given conditions. - */ - -char ** -listvars(int on, int off, char ***end) -{ - struct var **vpp; - struct var *vp; - char **ep; - int mask; - - STARTSTACKSTR(ep); - vpp = vartab; - mask = on | off; - do { - for (vp = *vpp ; vp ; vp = vp->next) - if ((vp->flags & mask) == on) { - if (ep == stackstrend()) - ep = growstackstr(); - *ep++ = (char *) vp->text; - } - } while (++vpp < vartab + VTABSIZE); - if (ep == stackstrend()) - ep = growstackstr(); - if (end) - *end = ep; - *ep++ = NULL; - return grabstackstr(ep); -} - - - -/* - * 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... - */ - -int -showvars(const char *prefix, int on, int off) -{ - const char *sep; - char **ep, **epend; - - ep = listvars(on, off, &epend); - qsort(ep, epend - ep, sizeof(char *), vpcmp); - - sep = *prefix ? spcstr : prefix; - - for (; ep < epend; ep++) { - const char *p; - const char *q; - - p = strchrnul(*ep, '='); - q = nullstr; - if (*p) - q = single_quote(++p); - - out1fmt("%s%s%.*s%s\n", prefix, sep, (int)(p - *ep), *ep, q); - } - - return 0; -} - - - -/* - * The export and readonly commands. - */ - -int -exportcmd(int argc, char **argv) -{ - struct var *vp; - char *name; - const char *p; - char **aptr; - int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; - int notp; - - notp = nextopt("p") - 'p'; - if (notp && ((name = *(aptr = argptr)))) { - do { - if ((p = strchr(name, '=')) != NULL) { - p++; - } else { - if ((vp = *findvar(hashvar(name), name))) { - vp->flags |= flag; - continue; - } - } - setvar(name, p, flag); - } while ((name = *++aptr) != NULL); - } else { - showvars(argv[0], flag, 0); - } - return 0; -} - - -/* - * The "local" command. - */ - -int -localcmd(int argc, char **argv) -{ - char *name; - - if (!localvar_stack) - sh_error("not in a function"); - - argv = argptr; - while ((name = *argv++) != NULL) { - mklocal(name, 0); - } - return 0; -} - - -/* - * Make a variable a local variable. When a variable is made local, it's - * 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(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)); - vp = NULL; - } else { - char *eq; - - vpp = hashvar(name); - vp = *findvar(vpp, name); - eq = strchr(name, '='); - if (vp == NULL) { - if (eq) - vp = setvareq(name, VSTRFIXED | flags); - else - vp = setvar(name, NULL, VSTRFIXED | flags); - lvp->flags = VUNSET; - } else { - lvp->text = vp->text; - lvp->flags = vp->flags; - vp->flags |= VSTRFIXED|VTEXTFIXED; - if (eq) - setvareq(name, flags); - } - } - lvp->vp = vp; - lvp->next = localvar_stack->lv; - localvar_stack->lv = lvp; - INTON; -} - - -/* - * Called after a function returns. - * Interrupts must be off. - */ - -static void -poplocalvars(void) -{ - struct localvar_list *ll; - struct localvar *lvp, *next; - struct var *vp; - - INTOFF; - ll = localvar_stack; - localvar_stack = ll->next; - - next = ll->lv; - ckfree(ll); - - while ((lvp = next) != NULL) { - next = lvp->next; - vp = lvp->vp; - TRACE(("poplocalvar %s\n", vp ? vp->text : "-")); - if (vp == NULL) { /* $- saved */ - memcpy(optlist, lvp->text, sizeof(optlist)); - ckfree(lvp->text); - optschanged(); - } else if (lvp->flags == VUNSET) { - vp->flags &= ~(VSTRFIXED|VREADONLY); - unsetvar(vp->text); - } else { - if (vp->func) - (*vp->func)(strchrnul(lvp->text, '=') + 1); - if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) - ckfree(vp->text); - vp->flags = lvp->flags; - vp->text = lvp->text; - } - ckfree(lvp); - } - INTON; -} - - -/* - * Create a new localvar environment. - */ -struct localvar_list *pushlocalvars(int push) -{ - struct localvar_list *ll; - struct localvar_list *top; - - top = localvar_stack; - if (!push) - goto out; - - INTOFF; - ll = ckmalloc(sizeof(*ll)); - ll->lv = NULL; - ll->next = top; - localvar_stack = ll; - INTON; - -out: - return top; -} - - -void unwindlocalvars(struct localvar_list *stop) -{ - while (localvar_stack != stop) - poplocalvars(); -} - - -/* - * 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 flag = 0; - - while ((i = nextopt("vf")) != '\0') { - flag = i; - } - - for (ap = argptr; *ap ; ap++) { - if (flag != 'f') { - unsetvar(*ap); - continue; - } - if (flag != 'v') - unsetfunc(*ap); - } - return 0; -} - - -/* - * Unset the specified variable. - */ - -void unsetvar(const char *s) -{ - setvar(s, 0, 0); -} - - - -/* - * Find the appropriate entry in the hash table from the name. - */ - -STATIC struct var ** -hashvar(const char *p) -{ - unsigned int hashval; - - hashval = ((unsigned char) *p) << 4; - while (*p && *p != '=') - hashval += (unsigned char) *p++; - return &vartab[hashval % VTABSIZE]; -} - - - -/* - * Compares two strings up to the first = or '\0'. The first - * string must be terminated by '='; the second may be terminated by - * either '=' or '\0'. - */ - -int -varcmp(const char *p, const char *q) -{ - int c, d; - - while ((c = *p) == (d = *q)) { - if (!c || c == '=') - goto out; - p++; - q++; - } - if (c == '=') - c = 0; - if (d == '=') - d = 0; -out: - return c - d; -} - -STATIC int -vpcmp(const void *a, const void *b) -{ - return varcmp(*(const char **)a, *(const char **)b); -} - -STATIC struct var ** -findvar(struct var **vpp, const char *name) -{ - for (; *vpp; vpp = &(*vpp)->next) { - if (varequal((*vpp)->text, name)) { - break; - } - } - return vpp; -} |