116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/*
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* Copyright (c) 1985 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define SHELLS "/etc/shells"
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/*
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* Do not add local shells here. They should be added in /etc/shells
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*/
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static char *okshells[] =
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{ "/bin/sh", "/bin/csh", 0 };
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static char **shells, *strings;
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static char **curshell = NULL;
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static char **
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initshells()
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{
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register char **sp, *cp;
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register FILE *fp;
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struct stat statb;
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if (shells != NULL)
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free((char *)shells);
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shells = NULL;
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if (strings != NULL)
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free(strings);
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strings = NULL;
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if ((fp = fopen(SHELLS, "r")) == (FILE *)0)
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return(okshells);
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if (fstat(fileno(fp), &statb) == -1) {
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(void)fclose(fp);
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return(okshells);
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}
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if ((strings = malloc((unsigned)statb.st_size)) == NULL) {
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(void)fclose(fp);
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return(okshells);
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}
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shells = (char **)calloc((unsigned)statb.st_size / 3, sizeof (char *));
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if (shells == NULL) {
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(void)fclose(fp);
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free(strings);
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strings = NULL;
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return(okshells);
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}
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sp = shells;
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cp = strings;
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while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
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while (*cp != '#' && *cp != '/' && *cp != '\0')
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cp++;
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if (*cp == '#' || *cp == '\0')
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continue;
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*sp++ = cp;
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while (!isspace(*cp) && *cp != '#' && *cp != '\0')
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cp++;
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*cp++ = '\0';
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}
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*sp = (char *)0;
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(void)fclose(fp);
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return (shells);
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}
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/*
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* Get a list of shells from SHELLS, if it exists.
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*/
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char *
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getusershell()
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{
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char *ret;
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if (curshell == NULL)
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curshell = initshells();
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ret = *curshell;
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if (ret != NULL)
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curshell++;
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return (ret);
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}
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void
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endusershell()
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{
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if (shells != NULL)
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free((char *)shells);
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shells = NULL;
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if (strings != NULL)
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free(strings);
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strings = NULL;
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curshell = NULL;
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}
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void
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setusershell()
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{
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curshell = initshells();
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}
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