lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* setusershell(), getusershell(), endusershell() for uClibc. |
| 2 | * |
| 3 | * Copyright (C) 2010 Bernhard Reutner-Fischer <uclibc@uclibc.org> |
| 4 | * |
| 5 | * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in |
| 6 | * this tarball. |
| 7 | */ |
| 8 | /* My manpage reads: |
| 9 | * The getusershell() function returns the next line from the file |
| 10 | * /etc/shells, opening the file if necessary. The line should contain |
| 11 | * the pathname of a valid user shell. If /etc/shells does not exist |
| 12 | * or is unreadable, getusershell() behaves as if /bin/sh and /bin/csh |
| 13 | * were listed in the file. |
| 14 | * The getusershell() function returns a NULL pointer on end-of-file. |
| 15 | */ |
| 16 | #include <unistd.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <paths.h> |
| 19 | #include <string.h> |
| 20 | #include "internal/parse_config.h" |
| 21 | |
| 22 | #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) |
| 23 | |
| 24 | static const char * const defaultsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL}; |
| 25 | static char *shellb, **shells; |
| 26 | static parser_t *shellp; |
| 27 | |
| 28 | void endusershell(void) |
| 29 | { |
| 30 | if (shellp) { |
| 31 | shells = (char**) shellb; |
| 32 | while (shells && *shells) { |
| 33 | char*xxx = *shells++; |
| 34 | free(xxx); |
| 35 | } |
| 36 | config_close(shellp); |
| 37 | shellp = NULL; |
| 38 | } |
| 39 | free(shellb); |
| 40 | shellb = NULL; |
| 41 | shells = NULL; |
| 42 | } |
| 43 | libc_hidden_def(endusershell) |
| 44 | |
| 45 | void setusershell(void) |
| 46 | { |
| 47 | endusershell(); |
| 48 | shellp = config_open(_PATH_SHELLS); |
| 49 | if (shellp == NULL) |
| 50 | shells = (char **)defaultsh; |
| 51 | else { |
| 52 | char **shell = NULL; |
| 53 | int pos = 0; |
| 54 | |
| 55 | while (config_read(shellp, &shell, 1, 1, "# \t", PARSE_NORMAL)) |
| 56 | { |
| 57 | shellb = realloc(shellb, (pos + 2) * sizeof(char*)); |
| 58 | shells = (char**) shellb + pos++; |
| 59 | *shells++ = strdup(*shell); |
| 60 | *shells = NULL; |
| 61 | |
| 62 | } |
| 63 | shells = (char **)shellb; |
| 64 | } |
| 65 | } |
| 66 | libc_hidden_def(setusershell) |
| 67 | |
| 68 | char *getusershell(void) |
| 69 | { |
| 70 | char *sh; |
| 71 | if (shells == NULL) |
| 72 | setusershell(); |
| 73 | sh = *shells; |
| 74 | if (sh) |
| 75 | shells++; |
| 76 | return sh; |
| 77 | } |
| 78 | #endif |