diff options
Diffstat (limited to 'REORG.TODO/misc/getusershell.c')
| -rw-r--r-- | REORG.TODO/misc/getusershell.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/REORG.TODO/misc/getusershell.c b/REORG.TODO/misc/getusershell.c new file mode 100644 index 0000000000..fc2c43b771 --- /dev/null +++ b/REORG.TODO/misc/getusershell.c @@ -0,0 +1,143 @@ +/* + * Copyright (c) 1985, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/param.h> +#include <sys/file.h> +#include <sys/stat.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <ctype.h> +#include <stdlib.h> +#include <unistd.h> +#include <paths.h> + +/* + * Local shells should NOT be added here. They should be added in + * /etc/shells. + */ + +/* NB: we do not initialize okshells here. The initialization needs + relocations. These interfaces are used so rarely that this is not + justified. Instead explicitly initialize the array when it is + used. */ +#if 0 +static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; +#else +static const char *okshells[3]; +#endif +static char **curshell, **shells, *strings; +static char **initshells (void) __THROW; + +/* + * Get a list of shells from _PATH_SHELLS, if it exists. + */ +char * +getusershell (void) +{ + char *ret; + + if (curshell == NULL) + curshell = initshells(); + ret = *curshell; + if (ret != NULL) + curshell++; + return (ret); +} + +void +endusershell (void) +{ + + free(shells); + shells = NULL; + free(strings); + strings = NULL; + curshell = NULL; +} + +void +setusershell (void) +{ + + curshell = initshells(); +} + +static char ** +initshells (void) +{ + char **sp, *cp; + FILE *fp; + struct stat64 statb; + size_t flen; + + free(shells); + shells = NULL; + free(strings); + strings = NULL; + if ((fp = fopen(_PATH_SHELLS, "rce")) == NULL) + goto init_okshells_noclose; + if (fstat64(fileno(fp), &statb) == -1) { + init_okshells: + (void)fclose(fp); + init_okshells_noclose: + okshells[0] = _PATH_BSHELL; + okshells[1] = _PATH_CSHELL; + return (char **) okshells; + } + if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3) + goto init_okshells; + flen = statb.st_size + 3; + if ((strings = malloc(flen)) == NULL) + goto init_okshells; + shells = malloc(statb.st_size / 3 * sizeof (char *)); + if (shells == NULL) { + free(strings); + strings = NULL; + goto init_okshells; + } + sp = shells; + cp = strings; + while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) { + while (*cp != '#' && *cp != '/' && *cp != '\0') + cp++; + if (*cp == '#' || *cp == '\0' || cp[1] == '\0') + continue; + *sp++ = cp; + while (!isspace(*cp) && *cp != '#' && *cp != '\0') + cp++; + *cp++ = '\0'; + } + *sp = NULL; + (void)fclose(fp); + return (shells); +} |