188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
/* $NetBSD: vars.c,v 1.14 2005/07/19 23:07:10 christos Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: vars.c,v 1.14 2005/07/19 23:07:10 christos Exp $");
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#endif
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#endif /* not lint */
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#include "rcv.h"
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#include "extern.h"
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/*
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* Mail -- a mail program
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*
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* Variable handling stuff.
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*/
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/*
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* Assign a value to a variable.
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*/
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void
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assign(const char name[], const char values[])
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{
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struct var *vp;
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int h;
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h = hash(name);
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vp = lookup(name);
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if (vp == NULL) {
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vp = (struct var *) calloc(1, sizeof *vp);
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if (vp == NULL)
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errx(1, "Out of memory");
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vp->v_name = vcopy(name);
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vp->v_link = variables[h];
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variables[h] = vp;
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}
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else
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v_free(vp->v_value);
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vp->v_value = vcopy(values);
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}
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/*
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* Free up a variable string. We do not bother to allocate
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* strings whose value is "" since they are expected to be frequent.
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* Thus, we cannot free same!
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*/
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void
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v_free(char *cp)
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{
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if (*cp)
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free(cp);
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}
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/*
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* Copy a variable value into permanent (ie, not collected after each
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* command) space. Do not bother to alloc space for ""
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*/
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char *
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vcopy(const char str[])
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{
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char *new;
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size_t len;
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if (*str == '\0')
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return strdup("");
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len = strlen(str) + 1;
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if ((new = malloc(len)) == NULL)
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errx(1, "Out of memory");
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(void)memmove(new, str, len);
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return new;
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}
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/*
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* Get the value of a variable and return it.
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* Look in the environment if its not available locally.
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*/
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char *
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value(const char name[])
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{
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struct var *vp;
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if ((vp = lookup(name)) == NULL)
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return(getenv(name));
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return(vp->v_value);
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}
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/*
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* Locate a variable and return its variable
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* node.
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*/
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struct var *
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lookup(const char name[])
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{
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struct var *vp;
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for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
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if (*vp->v_name == *name && equal(vp->v_name, name))
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return(vp);
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return(NULL);
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}
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/*
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* Locate a group name and return it.
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*/
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struct grouphead *
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findgroup(char name[])
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{
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struct grouphead *gh;
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for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
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if (*gh->g_name == *name && equal(gh->g_name, name))
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return(gh);
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return(NULL);
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}
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/*
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* Print a group out on stdout
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*/
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void
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printgroup(char name[])
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{
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struct grouphead *gh;
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struct group *gp;
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if ((gh = findgroup(name)) == NULL) {
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(void)printf("\"%s\": not a group\n", name);
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return;
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}
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(void)printf("%s\t", gh->g_name);
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for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
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(void)printf(" %s", gp->ge_name);
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(void)putchar('\n');
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}
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/*
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* Hash the passed string and return an index into
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* the variable or group hash table.
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*/
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int
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hash(const char *name)
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{
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int h = 0;
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while (*name) {
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h <<= 2;
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h += *name++;
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}
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if (h < 0 && (h = -h) < 0)
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h = 0;
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return (h % HSHSIZE);
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}
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