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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZGetVariable, ZSetVariable, and ZUnsetVariable
* functions.
*
* Created by: Robert French
*
* $Source$
* $Author$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
/* $Header$ */
#ifndef lint
static char rcsid_ZVariables_c[] = "$Header$";
#endif lint
#include <zephyr/mit-copyright.h>
#include <zephyr/zephyr_internal.h>
#include <ctype.h>
#include <pwd.h>
#define _toupper(c) (islower(c)?toupper(c):c)
char *ZGetVariable(var)
char *var;
{
char varfile[128],*ret;
char *get_varval();
if (get_localvarfile(varfile))
return ((char *)0);
if (ret = get_varval(varfile,var))
return (ret);
return (get_varval(DEFAULT_VARS_FILE,var));
}
Code_t ZSetVariable(var,value)
char *var;
char *value;
{
int written;
FILE *fpin,*fpout;
char varfile[128],varfilebackup[128],varbfr[512];
written = 0;
if (get_localvarfile(varfile))
return (ZERR_INTERNAL);
strcpy(varfilebackup,varfile);
strcat(varfilebackup,".backup");
if (!(fpout = fopen(varfilebackup,"w")))
return (errno);
if (fpin = fopen(varfile,"r")) {
while (fgets(varbfr,sizeof varbfr,fpin) != (char *) 0) {
if (varbfr[strlen(varbfr)-1] < ' ')
varbfr[strlen(varbfr)-1] = '\0';
if (varline(varbfr,var)) {
fprintf(fpout,"%s = %s\n",var,value);
written = 1;
}
else
fprintf(fpout,"%s\n",varbfr);
}
fclose(fpin);
}
if (!written)
fprintf(fpout,"%s = %s\n",var,value);
fclose(fpout);
if (rename(varfilebackup,varfile))
return (errno);
return (ZERR_NONE);
}
Code_t ZUnsetVariable(var)
char *var;
{
FILE *fpin,*fpout;
char varfile[128],varfilebackup[128],varbfr[512];
if (get_localvarfile(varfile))
return (ZERR_INTERNAL);
strcpy(varfilebackup,varfile);
strcat(varfilebackup,".backup");
if (!(fpout = fopen(varfilebackup,"w")))
return (errno);
if (fpin = fopen(varfile,"r")) {
while (fgets(varbfr,sizeof varbfr,fpin) != (char *) 0) {
if (varbfr[strlen(varbfr)-1] < ' ')
varbfr[strlen(varbfr)-1] = '\0';
if (!varline(varbfr,var))
fprintf(fpout,"%s\n",varbfr);
}
fclose(fpin);
}
fclose(fpout);
if (rename(varfilebackup,varfile))
return (errno);
return (ZERR_NONE);
}
static get_localvarfile(bfr)
char *bfr;
{
char *envptr;
struct passwd *pwd;
envptr = (char *)getenv("HOME");
if (envptr)
strcpy(bfr,envptr);
else {
if (!(pwd = getpwuid(getuid()))) {
fprintf(stderr,"Zephyr internal failure: Can't find your entry in /etc/passwd\n");
return (1);
}
strcpy(bfr,pwd->pw_dir);
}
strcat(bfr,"/");
strcat(bfr,".zephyr.vars");
return (0);
}
static char *get_varval(fn,var)
char *fn;
char *var;
{
FILE *fp;
char varbfr[512];
int i;
fp = fopen(fn,"r");
if (!fp)
return ((char *)0);
while (fgets(varbfr,sizeof varbfr,fp) != (char *) 0) {
if (varbfr[strlen(varbfr)-1] < ' ')
varbfr[strlen(varbfr)-1] = '\0';
if (!(i = varline(varbfr,var)))
continue;
fclose(fp);
return (varbfr+i);
}
fclose(fp);
return ((char *)0);
}
static int varline(bfr,var)
char *bfr;
char *var;
{
int i;
if (!bfr[0] || bfr[0] == '#')
return (0);
for (i = 0; bfr[i] && !isspace(bfr[i]) &&
bfr[i] != '='; i++)
if (_toupper(bfr[i]) != _toupper(var[i]))
break;
if ((!bfr[i] || !isspace(bfr[i])) && bfr[i] != '=')
return (0);
while (bfr[i] && isspace(bfr[i]))
i++;
if (bfr[i++] != '=')
return (0);
while (bfr[i] && isspace(bfr[i]))
i++;
return (i);
}
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