projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4a76e37c KM |
1 | /* |
| 2 | * Copyright (c) 1985 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | */ | |
| 6 | ||
| 2ce81398 DS |
7 | #if defined(LIBC_SCCS) && !defined(lint) |
| 8 | static char sccsid[] = "@(#)getusershell.c 5.2 (Berkeley) %G%"; | |
| 9 | #endif LIBC_SCCS and not lint | |
| 4a76e37c KM |
10 | |
| 11 | #include <sys/param.h> | |
| 12 | #include <sys/file.h> | |
| 13 | #include <sys/stat.h> | |
| 14 | #include <ctype.h> | |
| 15 | #include <stdio.h> | |
| 16 | ||
| 17 | #define SHELLS "/etc/shells" | |
| 18 | ||
| 19 | /* | |
| 20 | * Do not add local shells here. They should be added in /etc/shells | |
| 21 | */ | |
| 22 | static char *okshells[] = | |
| 23 | { "/bin/sh", "/bin/csh", 0 }; | |
| 24 | ||
| 25 | static int inprogress; | |
| 26 | static char **shells, *strings; | |
| 27 | extern char **initshells(); | |
| 28 | ||
| 29 | /* | |
| 30 | * Get a list of shells from SHELLS, if it exists. | |
| 31 | */ | |
| 32 | char * | |
| 33 | getusershell() | |
| 34 | { | |
| 35 | char *ret; | |
| 36 | static char **shells; | |
| 37 | ||
| 38 | if (!inprogress) | |
| 39 | shells = initshells(); | |
| 40 | ret = *shells; | |
| 41 | if (*shells != NULL) | |
| 42 | shells++; | |
| 43 | return (ret); | |
| 44 | } | |
| 45 | ||
| 46 | endusershell() | |
| 47 | { | |
| 48 | ||
| 49 | if (shells != NULL) | |
| 50 | free((char *)shells); | |
| 51 | shells = NULL; | |
| 52 | if (strings != NULL) | |
| 53 | free(strings); | |
| 54 | strings = NULL; | |
| 55 | inprogress = 0; | |
| 56 | } | |
| 57 | ||
| 58 | setusershell() | |
| 59 | { | |
| 60 | ||
| 61 | shells = initshells(); | |
| 62 | } | |
| 63 | ||
| 64 | static char ** | |
| 65 | initshells() | |
| 66 | { | |
| 67 | register char **sp, *cp; | |
| 68 | register FILE *fp; | |
| 69 | struct stat statb; | |
| 70 | extern char *malloc(), *calloc(); | |
| 71 | ||
| 72 | inprogress = 1; | |
| 73 | if (shells != NULL) | |
| 74 | free((char *)shells); | |
| 75 | shells = NULL; | |
| 76 | if (strings != NULL) | |
| 77 | free(strings); | |
| 78 | strings = NULL; | |
| 79 | if ((fp = fopen(SHELLS, "r")) == (FILE *)0) | |
| 80 | return(okshells); | |
| 81 | if (fstat(fileno(fp), &statb) == -1) { | |
| 82 | (void)fclose(fp); | |
| 83 | return(okshells); | |
| 84 | } | |
| 85 | if ((strings = malloc((unsigned)statb.st_size)) == NULL) { | |
| 86 | (void)fclose(fp); | |
| 87 | return(okshells); | |
| 88 | } | |
| 89 | shells = (char **)calloc((unsigned)statb.st_size / 3, sizeof (char *)); | |
| 90 | if (shells == NULL) { | |
| 91 | (void)fclose(fp); | |
| 92 | free(strings); | |
| 93 | strings = NULL; | |
| 94 | return(okshells); | |
| 95 | } | |
| 96 | sp = shells; | |
| 97 | cp = strings; | |
| 98 | while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { | |
| 99 | while (*cp != '/' && *cp != '\0') | |
| 100 | cp++; | |
| 101 | if (*cp == '\0') | |
| 102 | continue; | |
| 103 | *sp++ = cp; | |
| 104 | while (!isspace(*cp) && *cp != '#' && *cp != '\0') | |
| 105 | cp++; | |
| 106 | *cp++ = '\0'; | |
| 107 | } | |
| 108 | *sp = (char *)0; | |
| 109 | (void)fclose(fp); | |
| 110 | return (shells); | |
| 111 | } |