2.11BSD#431 - /usr/src/ucb/Mail/vars.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms, with or without
   6:  * modification, are permitted provided that the following conditions
   7:  * are met:
   8:  * 1. Redistributions of source code must retain the above copyright
   9:  *    notice, this list of conditions and the following disclaimer.
  10:  * 2. Redistributions in binary form must reproduce the above copyright
  11:  *    notice, this list of conditions and the following disclaimer in the
  12:  *    documentation and/or other materials provided with the distribution.
  13:  * 3. All advertising materials mentioning features or use of this software
  14:  *    must display the following acknowledgement:
  15:  *	This product includes software developed by the University of
  16:  *	California, Berkeley and its contributors.
  17:  * 4. Neither the name of the University nor the names of its contributors
  18:  *    may be used to endorse or promote products derived from this software
  19:  *    without specific prior written permission.
  20:  *
  21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31:  * SUCH DAMAGE.
  32:  */
  33: 
  34: #if !defined(lint) && defined(DOSCCS)
  35: static char sccsid[] = "@(#)vars.c	5.6 (Berkeley) 6/1/90";
  36: #endif
  37: 
  38: #include "rcv.h"
  39: 
  40: /*
  41:  * Mail -- a mail program
  42:  *
  43:  * Variable handling stuff.
  44:  */
  45: 
  46: /*
  47:  * Assign a value to a variable.
  48:  */
  49: 
  50: assign(name, value)
  51:     char name[], value[];
  52: {
  53:     register struct var *vp;
  54:     register int h;
  55: 
  56:     h = hash(name);
  57:     vp = lookup(name);
  58:     if (vp == NOVAR) {
  59:         vp = (struct var *) calloc(sizeof *vp, 1);
  60:         vp->v_name = vcopy(name);
  61:         vp->v_link = variables[h];
  62:         variables[h] = vp;
  63:     }
  64:     else
  65:         vfree(vp->v_value);
  66:     vp->v_value = vcopy(value);
  67: }
  68: 
  69: /*
  70:  * Free up a variable string.  We do not bother to allocate
  71:  * strings whose value is "" since they are expected to be frequent.
  72:  * Thus, we cannot free same!
  73:  */
  74: 
  75: vfree(cp)
  76:     char *cp;
  77: {
  78:     if (*cp)
  79:         free(cp);
  80: }
  81: 
  82: /*
  83:  * Copy a variable value into permanent (ie, not collected after each
  84:  * command) space.  Do not bother to alloc space for ""
  85:  */
  86: 
  87: char *
  88: vcopy(str)
  89:     char str[];
  90: {
  91:     char *new;
  92:     unsigned len;
  93: 
  94:     if (*str == '\0')
  95:         return "";
  96:     len = strlen(str) + 1;
  97:     if ((new = malloc(len)) == NULL)
  98:         panic("Out of memory");
  99:     bcopy(str, new, (int) len);
 100:     return new;
 101: }
 102: 
 103: /*
 104:  * Get the value of a variable and return it.
 105:  * Look in the environment if its not available locally.
 106:  */
 107: 
 108: char *
 109: value(name)
 110:     char name[];
 111: {
 112:     register struct var *vp;
 113: 
 114:     if ((vp = lookup(name)) == NOVAR)
 115:         return(getenv(name));
 116:     return(vp->v_value);
 117: }
 118: 
 119: /*
 120:  * Locate a variable and return its variable
 121:  * node.
 122:  */
 123: 
 124: struct var *
 125: lookup(name)
 126:     register char name[];
 127: {
 128:     register struct var *vp;
 129: 
 130:     for (vp = variables[hash(name)]; vp != NOVAR; vp = vp->v_link)
 131:         if (*vp->v_name == *name && equal(vp->v_name, name))
 132:             return(vp);
 133:     return(NOVAR);
 134: }
 135: 
 136: /*
 137:  * Locate a group name and return it.
 138:  */
 139: 
 140: struct grouphead *
 141: findgroup(name)
 142:     register char name[];
 143: {
 144:     register struct grouphead *gh;
 145: 
 146:     for (gh = groups[hash(name)]; gh != NOGRP; gh = gh->g_link)
 147:         if (*gh->g_name == *name && equal(gh->g_name, name))
 148:             return(gh);
 149:     return(NOGRP);
 150: }
 151: 
 152: /*
 153:  * Print a group out on stdout
 154:  */
 155: 
 156: printgroup(name)
 157:     char name[];
 158: {
 159:     register struct grouphead *gh;
 160:     register struct group *gp;
 161: 
 162:     if ((gh = findgroup(name)) == NOGRP) {
 163:         printf("\"%s\": not a group\n", name);
 164:         return;
 165:     }
 166:     printf("%s\t", gh->g_name);
 167:     for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link)
 168:         printf(" %s", gp->ge_name);
 169:     putchar('\n');
 170: }
 171: 
 172: /*
 173:  * Hash the passed string and return an index into
 174:  * the variable or group hash table.
 175:  */
 176: 
 177: hash(name)
 178:     register char *name;
 179: {
 180:     register h = 0;
 181: 
 182:     while (*name) {
 183:         h <<= 2;
 184:         h += *name++;
 185:     }
 186:     if (h < 0 && (h = -h) < 0)
 187:         h = 0;
 188:     return (h % HSHSIZE);
 189: }

Defined functions

Defined variables