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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
*
* $Id: fb8c9e545abcfe21934828feead60242b7eaab5f $
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#ifndef lint
static const char rcsid_ZVariables_c[] = "$Id: fb8c9e545abcfe21934828feead60242b7eaab5f $";
#endif
#include <internal.h>
#include <ctype.h>
#include <pwd.h>
Code_t get_localvarfile(char *bfr);
static char *get_varval(char *fn, char *val);
static int varline(char *bfr, char *var);
char *
ZGetVariable(char *var)
{
char varfile[128], *ret;
Code_t code;
code = get_localvarfile(varfile);
if (code)
return ((char *)0);
if ((ret = get_varval(varfile, var)) != ZERR_NONE)
return (ret);
sprintf(varfile, "%s/zephyr/zephyr.vars", SYSCONFDIR);
return (get_varval(varfile, var));
}
Code_t
ZSetVariable(char *var, char *value)
{
int written;
FILE *fpin, *fpout;
char varfile[128], varfilebackup[128], varbfr[512];
Code_t code;
written = 0;
code = get_localvarfile(varfile);
if (code)
return code;
(void) strcpy(varfilebackup, varfile);
(void) strcat(varfilebackup, ".backup");
if (!(fpout = fopen(varfilebackup, "w")))
return (errno);
if ((fpin = fopen(varfile, "r")) != NULL) {
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);
}
(void) fclose(fpin); /* don't care about errs on input */
}
if (!written)
fprintf(fpout, "%s = %s\n", var, value);
if (fclose(fpout) == EOF)
return(EIO); /* can't rely on errno */
if (rename(varfilebackup, varfile))
return (errno);
return (ZERR_NONE);
}
Code_t
ZUnsetVariable(char *var)
{
FILE *fpin, *fpout;
char varfile[128], varfilebackup[128], varbfr[512];
Code_t code;
code = get_localvarfile(varfile);
if (code)
return code;
(void) strcpy(varfilebackup, varfile);
(void) strcat(varfilebackup, ".backup");
if (!(fpout = fopen(varfilebackup, "w")))
return (errno);
if ((fpin = fopen(varfile, "r")) != NULL) {
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);
}
(void) fclose(fpin); /* don't care about read close errs */
}
if (fclose(fpout) == EOF)
return(EIO); /* errno isn't reliable */
if (rename(varfilebackup, varfile))
return (errno);
return (ZERR_NONE);
}
Code_t
get_localvarfile(char *bfr)
{
char *envptr;
struct passwd *pwd;
envptr = getenv("ZEPHYR_VARS");
if (envptr)
(void) strcpy(bfr, envptr);
else {
envptr = getenv("HOME");
if (envptr)
(void) strcpy(bfr, envptr);
else {
if (!(pwd = getpwuid((int) getuid())))
return errno;
(void) strcpy(bfr, pwd->pw_dir);
}
(void) strcat(bfr, "/");
(void) strcat(bfr, ".zephyr.vars");
}
return (0);
}
static char *
get_varval(char *fn, char *var)
{
FILE *fp;
static 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;
(void) fclose(fp); /* open read-only, don't care */
return (varbfr+i);
}
(void) fclose(fp); /* open read-only, don't care */
return ((char *)0);
}
/* If the variable in the line bfr[] is the same as var, return index to
the variable value, else return 0. */
static int
varline(char *bfr, char *var)
{
register char *cp;
size_t namelen;
if (!bfr[0] || bfr[0] == '#') /* comment or null line */
return (0);
cp = bfr;
while (*cp && !isspace(*cp) && (*cp != '='))
cp++;
#define max(a,b) ((a > b) ? (a) : (b))
namelen = cp - bfr;
if (strncasecmp(bfr, var, max(strlen(var), namelen)))
return(0); /* var is not the var in
bfr ==> no match */
cp = strchr(bfr, '=');
if (!cp)
return(0);
cp++;
while (*cp && isspace(*cp)) /* space up to variable value */
cp++;
return (cp - bfr); /* return index */
}
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