Annotation of src/usr.bin/mail/vars.c, Revision 1.1
1.1 ! deraadt 1: /*
! 2: * Copyright (c) 1980, 1993
! 3: * The Regents of the University of California. 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: #ifndef lint
! 35: static char sccsid[] = "from: @(#)vars.c 8.1 (Berkeley) 6/6/93";
! 36: static char rcsid[] = "$Id: vars.c,v 1.3 1994/06/29 05:09:49 deraadt Exp $";
! 37: #endif /* not lint */
! 38:
! 39: #include "rcv.h"
! 40: #include "extern.h"
! 41:
! 42: /*
! 43: * Mail -- a mail program
! 44: *
! 45: * Variable handling stuff.
! 46: */
! 47:
! 48: /*
! 49: * Assign a value to a variable.
! 50: */
! 51: void
! 52: assign(name, value)
! 53: char name[], value[];
! 54: {
! 55: register struct var *vp;
! 56: register int h;
! 57:
! 58: h = hash(name);
! 59: vp = lookup(name);
! 60: if (vp == NOVAR) {
! 61: vp = (struct var *) calloc(sizeof *vp, 1);
! 62: vp->v_name = vcopy(name);
! 63: vp->v_link = variables[h];
! 64: variables[h] = vp;
! 65: }
! 66: else
! 67: vfree(vp->v_value);
! 68: vp->v_value = vcopy(value);
! 69: }
! 70:
! 71: /*
! 72: * Free up a variable string. We do not bother to allocate
! 73: * strings whose value is "" since they are expected to be frequent.
! 74: * Thus, we cannot free same!
! 75: */
! 76: void
! 77: vfree(cp)
! 78: char *cp;
! 79: {
! 80: if (*cp)
! 81: free(cp);
! 82: }
! 83:
! 84: /*
! 85: * Copy a variable value into permanent (ie, not collected after each
! 86: * command) space. Do not bother to alloc space for ""
! 87: */
! 88:
! 89: char *
! 90: vcopy(str)
! 91: char str[];
! 92: {
! 93: char *new;
! 94: unsigned len;
! 95:
! 96: if (*str == '\0')
! 97: return "";
! 98: len = strlen(str) + 1;
! 99: if ((new = malloc(len)) == NULL)
! 100: panic("Out of memory");
! 101: bcopy(str, new, (int) len);
! 102: return new;
! 103: }
! 104:
! 105: /*
! 106: * Get the value of a variable and return it.
! 107: * Look in the environment if its not available locally.
! 108: */
! 109:
! 110: char *
! 111: value(name)
! 112: char name[];
! 113: {
! 114: register struct var *vp;
! 115:
! 116: if ((vp = lookup(name)) == NOVAR)
! 117: return(getenv(name));
! 118: return(vp->v_value);
! 119: }
! 120:
! 121: /*
! 122: * Locate a variable and return its variable
! 123: * node.
! 124: */
! 125:
! 126: struct var *
! 127: lookup(name)
! 128: register char name[];
! 129: {
! 130: register struct var *vp;
! 131:
! 132: for (vp = variables[hash(name)]; vp != NOVAR; vp = vp->v_link)
! 133: if (*vp->v_name == *name && equal(vp->v_name, name))
! 134: return(vp);
! 135: return(NOVAR);
! 136: }
! 137:
! 138: /*
! 139: * Locate a group name and return it.
! 140: */
! 141:
! 142: struct grouphead *
! 143: findgroup(name)
! 144: register char name[];
! 145: {
! 146: register struct grouphead *gh;
! 147:
! 148: for (gh = groups[hash(name)]; gh != NOGRP; gh = gh->g_link)
! 149: if (*gh->g_name == *name && equal(gh->g_name, name))
! 150: return(gh);
! 151: return(NOGRP);
! 152: }
! 153:
! 154: /*
! 155: * Print a group out on stdout
! 156: */
! 157: void
! 158: printgroup(name)
! 159: char name[];
! 160: {
! 161: register struct grouphead *gh;
! 162: register struct group *gp;
! 163:
! 164: if ((gh = findgroup(name)) == NOGRP) {
! 165: printf("\"%s\": not a group\n", name);
! 166: return;
! 167: }
! 168: printf("%s\t", gh->g_name);
! 169: for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link)
! 170: printf(" %s", gp->ge_name);
! 171: putchar('\n');
! 172: }
! 173:
! 174: /*
! 175: * Hash the passed string and return an index into
! 176: * the variable or group hash table.
! 177: */
! 178: int
! 179: hash(name)
! 180: register char *name;
! 181: {
! 182: register h = 0;
! 183:
! 184: while (*name) {
! 185: h <<= 2;
! 186: h += *name++;
! 187: }
! 188: if (h < 0 && (h = -h) < 0)
! 189: h = 0;
! 190: return (h % HSHSIZE);
! 191: }
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