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Annotation of 43BSDReno/usr.bin/mail/vars.c, revision 1.1

1.1     ! root        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 are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)vars.c     5.6 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "rcv.h"
        !            25: 
        !            26: /*
        !            27:  * Mail -- a mail program
        !            28:  *
        !            29:  * Variable handling stuff.
        !            30:  */
        !            31: 
        !            32: /*
        !            33:  * Assign a value to a variable.
        !            34:  */
        !            35: 
        !            36: assign(name, value)
        !            37:        char name[], value[];
        !            38: {
        !            39:        register struct var *vp;
        !            40:        register int h;
        !            41: 
        !            42:        h = hash(name);
        !            43:        vp = lookup(name);
        !            44:        if (vp == NOVAR) {
        !            45:                vp = (struct var *) calloc(sizeof *vp, 1);
        !            46:                vp->v_name = vcopy(name);
        !            47:                vp->v_link = variables[h];
        !            48:                variables[h] = vp;
        !            49:        }
        !            50:        else
        !            51:                vfree(vp->v_value);
        !            52:        vp->v_value = vcopy(value);
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * Free up a variable string.  We do not bother to allocate
        !            57:  * strings whose value is "" since they are expected to be frequent.
        !            58:  * Thus, we cannot free same!
        !            59:  */
        !            60: 
        !            61: vfree(cp)
        !            62:        char *cp;
        !            63: {
        !            64:        if (*cp)
        !            65:                free(cp);
        !            66: }
        !            67: 
        !            68: /*
        !            69:  * Copy a variable value into permanent (ie, not collected after each
        !            70:  * command) space.  Do not bother to alloc space for ""
        !            71:  */
        !            72: 
        !            73: char *
        !            74: vcopy(str)
        !            75:        char str[];
        !            76: {
        !            77:        char *new;
        !            78:        unsigned len;
        !            79: 
        !            80:        if (*str == '\0')
        !            81:                return "";
        !            82:        len = strlen(str) + 1;
        !            83:        if ((new = malloc(len)) == NULL)
        !            84:                panic("Out of memory");
        !            85:        bcopy(str, new, (int) len);
        !            86:        return new;
        !            87: }
        !            88: 
        !            89: /*
        !            90:  * Get the value of a variable and return it.
        !            91:  * Look in the environment if its not available locally.
        !            92:  */
        !            93: 
        !            94: char *
        !            95: value(name)
        !            96:        char name[];
        !            97: {
        !            98:        register struct var *vp;
        !            99: 
        !           100:        if ((vp = lookup(name)) == NOVAR)
        !           101:                return(getenv(name));
        !           102:        return(vp->v_value);
        !           103: }
        !           104: 
        !           105: /*
        !           106:  * Locate a variable and return its variable
        !           107:  * node.
        !           108:  */
        !           109: 
        !           110: struct var *
        !           111: lookup(name)
        !           112:        register char name[];
        !           113: {
        !           114:        register struct var *vp;
        !           115: 
        !           116:        for (vp = variables[hash(name)]; vp != NOVAR; vp = vp->v_link)
        !           117:                if (*vp->v_name == *name && equal(vp->v_name, name))
        !           118:                        return(vp);
        !           119:        return(NOVAR);
        !           120: }
        !           121: 
        !           122: /*
        !           123:  * Locate a group name and return it.
        !           124:  */
        !           125: 
        !           126: struct grouphead *
        !           127: findgroup(name)
        !           128:        register char name[];
        !           129: {
        !           130:        register struct grouphead *gh;
        !           131: 
        !           132:        for (gh = groups[hash(name)]; gh != NOGRP; gh = gh->g_link)
        !           133:                if (*gh->g_name == *name && equal(gh->g_name, name))
        !           134:                        return(gh);
        !           135:        return(NOGRP);
        !           136: }
        !           137: 
        !           138: /*
        !           139:  * Print a group out on stdout
        !           140:  */
        !           141: 
        !           142: printgroup(name)
        !           143:        char name[];
        !           144: {
        !           145:        register struct grouphead *gh;
        !           146:        register struct group *gp;
        !           147: 
        !           148:        if ((gh = findgroup(name)) == NOGRP) {
        !           149:                printf("\"%s\": not a group\n", name);
        !           150:                return;
        !           151:        }
        !           152:        printf("%s\t", gh->g_name);
        !           153:        for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link)
        !           154:                printf(" %s", gp->ge_name);
        !           155:        putchar('\n');
        !           156: }
        !           157: 
        !           158: /*
        !           159:  * Hash the passed string and return an index into
        !           160:  * the variable or group hash table.
        !           161:  */
        !           162: 
        !           163: hash(name)
        !           164:        register char *name;
        !           165: {
        !           166:        register h = 0;
        !           167: 
        !           168:        while (*name) {
        !           169:                h <<= 2;
        !           170:                h += *name++;
        !           171:        }
        !           172:        if (h < 0 && (h = -h) < 0)
        !           173:                h = 0;
        !           174:        return (h % HSHSIZE);
        !           175: }

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