--- /dev/null
+/*-
+ * 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.
+ * 4. 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.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <paths.h>
+
+/*
+ * Shell variables.
+ */
+
+#include <locale.h>
+#include <langinfo.h>
+
+#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 "mail.h"
+#include "var.h"
+#include "memalloc.h"
+#include "error.h"
+#include "mystring.h"
+#include "parser.h"
+#include "builtins.h"
+#ifndef NO_HISTORY
+#include "myhistedit.h"
+#endif
+
+
+#define VTABSIZE 39
+
+
+struct varinit {
+ struct var *var;
+ int flags;
+ const char *text;
+ void (*func)(const char *);
+};
+
+
+#ifndef NO_HISTORY
+struct var vhistsize;
+struct var vterm;
+#endif
+struct var vifs;
+struct var vmail;
+struct var vmpath;
+struct var vpath;
+struct var vps1;
+struct var vps2;
+struct var vps4;
+static struct var voptind;
+struct var vdisvfork;
+
+struct localvar *localvars;
+int forcelocal;
+
+static const struct varinit varinit[] = {
+#ifndef NO_HISTORY
+ { &vhistsize, VUNSET, "HISTSIZE=",
+ sethistsize },
+#endif
+ { &vifs, 0, "IFS= \t\n",
+ NULL },
+ { &vmail, VUNSET, "MAIL=",
+ NULL },
+ { &vmpath, VUNSET, "MAILPATH=",
+ NULL },
+ { &vpath, 0, "PATH=" _PATH_DEFPATH,
+ changepath },
+ /*
+ * vps1 depends on uid
+ */
+ { &vps2, 0, "PS2=> ",
+ NULL },
+ { &vps4, 0, "PS4=+ ",
+ NULL },
+#ifndef NO_HISTORY
+ { &vterm, VUNSET, "TERM=",
+ setterm },
+#endif
+ { &voptind, 0, "OPTIND=1",
+ getoptsreset },
+ { &vdisvfork, VUNSET, "SH_DISABLE_VFORK=",
+ NULL },
+ { NULL, 0, NULL,
+ NULL }
+};
+
+static struct var *vartab[VTABSIZE];
+
+static const char *const locale_names[7] = {
+ "LC_COLLATE", "LC_CTYPE", "LC_MONETARY",
+ "LC_NUMERIC", "LC_TIME", "LC_MESSAGES", NULL
+};
+static const int locale_categories[7] = {
+ LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME, LC_MESSAGES, 0
+};
+
+static int varequal(const char *, const char *);
+static struct var *find_var(const char *, struct var ***, int *);
+static int localevar(const char *);
+static void setvareq_const(const char *s, int flags);
+
+extern char **environ;
+
+/*
+ * This routine initializes the builtin variables and imports the environment.
+ * It is called when the shell is initialized.
+ */
+
+void
+initvar(void)
+{
+ char ppid[20];
+ const struct varinit *ip;
+ struct var *vp;
+ struct var **vpp;
+ char **envp;
+
+ 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 = __DECONST(char *, ip->text);
+ vp->flags = ip->flags | VSTRFIXED | VTEXTFIXED;
+ vp->func = ip->func;
+ }
+ /*
+ * PS1 depends on uid
+ */
+ if (find_var("PS1", &vpp, &vps1.name_len) == NULL) {
+ vps1.next = *vpp;
+ *vpp = &vps1;
+ vps1.text = __DECONST(char *, geteuid() ? "PS1=$ " : "PS1=# ");
+ vps1.flags = VSTRFIXED|VTEXTFIXED;
+ }
+ fmtstr(ppid, sizeof(ppid), "%d", (int)getppid());
+ setvarsafe("PPID", ppid, 0);
+ for (envp = environ ; *envp ; envp++) {
+ if (strchr(*envp, '=')) {
+ setvareq(*envp, VEXPORT|VTEXTFIXED);
+ }
+ }
+ setvareq_const("OPTIND=1", 0);
+}
+
+/*
+ * 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 err = 0;
+ int inton;
+
+ inton = is_int_on();
+ if (setjmp(jmploc.loc))
+ err = 1;
+ else {
+ handler = &jmploc;
+ setvar(name, val, flags);
+ }
+ handler = savehandler;
+ SETINTON(inton);
+ return err;
+}
+
+/*
+ * Set the value of a variable. The flags argument is stored with the
+ * flags of the variable. If val is NULL, the variable is unset.
+ */
+
+void
+setvar(const char *name, const char *val, int flags)
+{
+ const char *p;
+ size_t len;
+ size_t namelen;
+ size_t vallen;
+ char *nameeq;
+ int isbad;
+
+ isbad = 0;
+ p = name;
+ if (! is_name(*p))
+ isbad = 1;
+ p++;
+ for (;;) {
+ if (! is_in_name(*p)) {
+ if (*p == '\0' || *p == '=')
+ break;
+ isbad = 1;
+ }
+ p++;
+ }
+ namelen = p - name;
+ if (isbad)
+ error("%.*s: bad variable name", (int)namelen, name);
+ len = namelen + 2; /* 2 is space for '=' and '\0' */
+ if (val == NULL) {
+ flags |= VUNSET;
+ vallen = 0;
+ } else {
+ vallen = strlen(val);
+ len += vallen;
+ }
+ INTOFF;
+ nameeq = ckmalloc(len);
+ memcpy(nameeq, name, namelen);
+ nameeq[namelen] = '=';
+ if (val)
+ memcpy(nameeq + namelen + 1, val, vallen + 1);
+ else
+ nameeq[namelen + 1] = '\0';
+ setvareq(nameeq, flags);
+ INTON;
+}
+
+static int
+localevar(const char *s)
+{
+ const char *const *ss;
+
+ if (*s != 'L')
+ return 0;
+ if (varequal(s + 1, "ANG"))
+ return 1;
+ if (strncmp(s + 1, "C_", 2) != 0)
+ return 0;
+ if (varequal(s + 3, "ALL"))
+ return 1;
+ for (ss = locale_names; *ss ; ss++)
+ if (varequal(s + 3, *ss + 3))
+ return 1;
+ return 0;
+}
+
+
+/*
+ * Sets/unsets an environment variable from a pointer that may actually be a
+ * pointer into environ where the string should not be manipulated.
+ */
+static void
+change_env(const char *s, int set)
+{
+ char *eqp;
+ char *ss;
+
+ INTOFF;
+ ss = savestr(s);
+ if ((eqp = strchr(ss, '=')) != NULL)
+ *eqp = '\0';
+ if (set && eqp != NULL)
+ (void) setenv(ss, eqp + 1, 1);
+ else
+ (void) unsetenv(ss);
+ ckfree(ss);
+ INTON;
+
+ return;
+}
+
+
+/*
+ * 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.
+ */
+
+void
+setvareq(char *s, int flags)
+{
+ struct var *vp, **vpp;
+ int nlen;
+
+ if (aflag)
+ flags |= VEXPORT;
+ if (forcelocal && !(flags & (VNOSET | VNOLOCAL)))
+ mklocal(s);
+ vp = find_var(s, &vpp, &nlen);
+ if (vp != NULL) {
+ if (vp->flags & VREADONLY) {
+ if ((flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(s);
+ error("%.*s: is read only", vp->name_len, s);
+ }
+ if (flags & VNOSET) {
+ if ((flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(s);
+ return;
+ }
+ INTOFF;
+
+ if (vp->func && (flags & VNOFUNC) == 0)
+ (*vp->func)(s + vp->name_len + 1);
+
+ if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(vp->text);
+
+ vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
+ vp->flags |= flags;
+ vp->text = s;
+
+ /*
+ * We could roll this to a function, to handle it as
+ * a regular variable function callback, but why bother?
+ *
+ * Note: this assumes iflag is not set to 1 initially.
+ * As part of initvar(), this is called before arguments
+ * are looked at.
+ */
+ if ((vp == &vmpath || (vp == &vmail && ! mpathset())) &&
+ iflag == 1)
+ chkmail(1);
+ if ((vp->flags & VEXPORT) && localevar(s)) {
+ change_env(s, 1);
+ (void) setlocale(LC_ALL, "");
+ updatecharset();
+ }
+ INTON;
+ return;
+ }
+ /* not found */
+ if (flags & VNOSET) {
+ if ((flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(s);
+ return;
+ }
+ INTOFF;
+ vp = ckmalloc(sizeof (*vp));
+ vp->flags = flags;
+ vp->text = s;
+ vp->name_len = nlen;
+ vp->next = *vpp;
+ vp->func = NULL;
+ *vpp = vp;
+ if ((vp->flags & VEXPORT) && localevar(s)) {
+ change_env(s, 1);
+ (void) setlocale(LC_ALL, "");
+ updatecharset();
+ }
+ INTON;
+}
+
+
+static void
+setvareq_const(const char *s, int flags)
+{
+ setvareq(__DECONST(char *, s), flags | VTEXTFIXED);
+}
+
+
+/*
+ * 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;
+}
+
+
+
+/*
+ * 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;
+ 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;
+ char *result;
+
+ result = NULL;
+ for (sp = cmdenviron ; sp ; sp = sp->next) {
+ if (varequal(sp->text, name))
+ result = strchr(sp->text, '=') + 1;
+ }
+ if (result != NULL)
+ return result;
+
+ v = find_var(name, NULL, NULL);
+ if (v == NULL || v->flags & VUNSET ||
+ (!doall && (v->flags & VEXPORT) == 0))
+ return NULL;
+ return v->text + v->name_len + 1;
+}
+
+
+/*
+ * Set up locale for a builtin (LANG/LC_* assignments).
+ */
+void
+bltinsetlocale(void)
+{
+ struct strlist *lp;
+ int act = 0;
+ char *loc, *locdef;
+ int i;
+
+ for (lp = cmdenviron ; lp ; lp = lp->next) {
+ if (localevar(lp->text)) {
+ act = 1;
+ break;
+ }
+ }
+ if (!act)
+ return;
+ loc = bltinlookup("LC_ALL", 0);
+ INTOFF;
+ if (loc != NULL) {
+ setlocale(LC_ALL, loc);
+ INTON;
+ updatecharset();
+ return;
+ }
+ locdef = bltinlookup("LANG", 0);
+ for (i = 0; locale_names[i] != NULL; i++) {
+ loc = bltinlookup(locale_names[i], 0);
+ if (loc == NULL)
+ loc = locdef;
+ if (loc != NULL)
+ setlocale(locale_categories[i], loc);
+ }
+ INTON;
+ updatecharset();
+}
+
+/*
+ * Undo the effect of bltinlocaleset().
+ */
+void
+bltinunsetlocale(void)
+{
+ struct strlist *lp;
+
+ INTOFF;
+ for (lp = cmdenviron ; lp ; lp = lp->next) {
+ if (localevar(lp->text)) {
+ setlocale(LC_ALL, "");
+ updatecharset();
+ return;
+ }
+ }
+ INTON;
+}
+
+/*
+ * Update the localeisutf8 flag.
+ */
+void
+updatecharset(void)
+{
+ char *charset;
+
+ charset = nl_langinfo(CODESET);
+ localeisutf8 = !strcmp(charset, "UTF-8");
+}
+
+void
+initcharset(void)
+{
+ updatecharset();
+ initial_localeisutf8 = localeisutf8;
+}
+
+/*
+ * 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, **ep;
+
+ nenv = 0;
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next)
+ if (vp->flags & VEXPORT)
+ 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)
+ *ep++ = vp->text;
+ }
+ *ep = NULL;
+ return env;
+}
+
+
+static int
+var_compare(const void *a, const void *b)
+{
+ const char *const *sa, *const *sb;
+
+ sa = a;
+ sb = b;
+ /*
+ * This compares two var=value strings which creates a different
+ * order from what you would probably expect. POSIX is somewhat
+ * ambiguous on what should be sorted exactly.
+ */
+ return strcoll(*sa, *sb);
+}
+
+
+/*
+ * Command to list all variables which are set. This is invoked from the
+ * set command when it is called without any options or operands.
+ */
+
+int
+showvarscmd(int argc __unused, char **argv __unused)
+{
+ struct var **vpp;
+ struct var *vp;
+ const char *s;
+ const char **vars;
+ int i, n;
+
+ /*
+ * POSIX requires us to sort the variables.
+ */
+ n = 0;
+ for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
+ for (vp = *vpp; vp; vp = vp->next) {
+ if (!(vp->flags & VUNSET))
+ n++;
+ }
+ }
+
+ INTOFF;
+ vars = ckmalloc(n * sizeof(*vars));
+ i = 0;
+ for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
+ for (vp = *vpp; vp; vp = vp->next) {
+ if (!(vp->flags & VUNSET))
+ vars[i++] = vp->text;
+ }
+ }
+
+ qsort(vars, n, sizeof(*vars), var_compare);
+ for (i = 0; i < n; i++) {
+ /*
+ * Skip improper variable names so the output remains usable as
+ * shell input.
+ */
+ if (!isassignment(vars[i]))
+ continue;
+ s = strchr(vars[i], '=');
+ s++;
+ outbin(vars[i], s - vars[i], out1);
+ out1qstr(s);
+ out1c('\n');
+ }
+ ckfree(vars);
+ INTON;
+
+ return 0;
+}
+
+
+
+/*
+ * The export and readonly commands.
+ */
+
+int
+exportcmd(int argc __unused, char **argv)
+{
+ struct var **vpp;
+ struct var *vp;
+ char **ap;
+ char *name;
+ char *p;
+ char *cmdname;
+ int ch, values;
+ int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
+
+ cmdname = argv[0];
+ values = 0;
+ while ((ch = nextopt("p")) != '\0') {
+ switch (ch) {
+ case 'p':
+ values = 1;
+ break;
+ }
+ }
+
+ if (values && *argptr != NULL)
+ error("-p requires no arguments");
+ if (*argptr != NULL) {
+ for (ap = argptr; (name = *ap) != NULL; ap++) {
+ if ((p = strchr(name, '=')) != NULL) {
+ p++;
+ } else {
+ vp = find_var(name, NULL, NULL);
+ if (vp != NULL) {
+ vp->flags |= flag;
+ if ((vp->flags & VEXPORT) && localevar(vp->text)) {
+ change_env(vp->text, 1);
+ (void) setlocale(LC_ALL, "");
+ updatecharset();
+ }
+ continue;
+ }
+ }
+ setvar(name, p, flag);
+ }
+ } else {
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next) {
+ if (vp->flags & flag) {
+ if (values) {
+ /*
+ * Skip improper variable names
+ * so the output remains usable
+ * as shell input.
+ */
+ if (!isassignment(vp->text))
+ continue;
+ out1str(cmdname);
+ out1c(' ');
+ }
+ if (values && !(vp->flags & VUNSET)) {
+ outbin(vp->text,
+ vp->name_len + 1, out1);
+ out1qstr(vp->text +
+ vp->name_len + 1);
+ } else
+ outbin(vp->text, vp->name_len,
+ out1);
+ out1c('\n');
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+
+/*
+ * The "local" command.
+ */
+
+int
+localcmd(int argc __unused, char **argv __unused)
+{
+ char *name;
+
+ nextopt("");
+ if (! in_function())
+ error("Not in a function");
+ while ((name = *argptr++) != NULL) {
+ mklocal(name);
+ }
+ 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)
+{
+ struct localvar *lvp;
+ struct var **vpp;
+ struct var *vp;
+
+ INTOFF;
+ lvp = ckmalloc(sizeof (struct localvar));
+ if (name[0] == '-' && name[1] == '\0') {
+ lvp->text = ckmalloc(sizeof optlist);
+ memcpy(lvp->text, optlist, sizeof optlist);
+ vp = NULL;
+ } else {
+ vp = find_var(name, &vpp, NULL);
+ if (vp == NULL) {
+ if (strchr(name, '='))
+ setvareq(savestr(name), VSTRFIXED | VNOLOCAL);
+ else
+ setvar(name, NULL, VSTRFIXED | VNOLOCAL);
+ vp = *vpp; /* the new variable */
+ lvp->text = NULL;
+ lvp->flags = VUNSET;
+ } else {
+ lvp->text = vp->text;
+ lvp->flags = vp->flags;
+ vp->flags |= VSTRFIXED|VTEXTFIXED;
+ if (name[vp->name_len] == '=')
+ setvareq(savestr(name), VNOLOCAL);
+ }
+ }
+ lvp->vp = vp;
+ lvp->next = localvars;
+ localvars = lvp;
+ INTON;
+}
+
+
+/*
+ * Called after a function returns.
+ */
+
+void
+poplocalvars(void)
+{
+ struct localvar *lvp;
+ struct var *vp;
+
+ INTOFF;
+ while ((lvp = localvars) != NULL) {
+ localvars = lvp->next;
+ vp = lvp->vp;
+ if (vp == NULL) { /* $- saved */
+ memcpy(optlist, lvp->text, sizeof optlist);
+ ckfree(lvp->text);
+ optschanged();
+ } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
+ (void)unsetvar(vp->text);
+ } else {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ vp->flags = lvp->flags;
+ vp->text = lvp->text;
+ }
+ ckfree(lvp);
+ }
+ INTON;
+}
+
+
+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("too many arguments");
+ return 0;
+}
+
+
+/*
+ * The unset builtin command.
+ */
+
+int
+unsetcmd(int argc __unused, char **argv __unused)
+{
+ char **ap;
+ int i;
+ int flg_func = 0;
+ int flg_var = 0;
+ int ret = 0;
+
+ while ((i = nextopt("vf")) != '\0') {
+ if (i == 'f')
+ flg_func = 1;
+ else
+ flg_var = 1;
+ }
+ if (flg_func == 0 && flg_var == 0)
+ flg_var = 1;
+
+ INTOFF;
+ for (ap = argptr; *ap ; ap++) {
+ if (flg_func)
+ ret |= unsetfunc(*ap);
+ if (flg_var)
+ ret |= unsetvar(*ap);
+ }
+ INTON;
+ return ret;
+}
+
+
+/*
+ * Unset the specified variable.
+ * Called with interrupts off.
+ */
+
+int
+unsetvar(const char *s)
+{
+ struct var **vpp;
+ struct var *vp;
+
+ vp = find_var(s, &vpp, NULL);
+ if (vp == NULL)
+ return (0);
+ if (vp->flags & VREADONLY)
+ return (1);
+ if (vp->text[vp->name_len + 1] != '\0')
+ setvar(s, "", 0);
+ if ((vp->flags & VEXPORT) && localevar(vp->text)) {
+ change_env(s, 0);
+ setlocale(LC_ALL, "");
+ updatecharset();
+ }
+ vp->flags &= ~VEXPORT;
+ vp->flags |= VUNSET;
+ if ((vp->flags & VSTRFIXED) == 0) {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ *vpp = vp->next;
+ ckfree(vp);
+ }
+ return (0);
+}
+
+
+
+/*
+ * Returns true if the two strings specify the same variable. The first
+ * variable name is terminated by '='; the second may be terminated by
+ * either '=' or '\0'.
+ */
+
+static int
+varequal(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;
+}
projects / apple / shell_cmds.git / blobdiff