diff options
Diffstat (limited to 'misc/getusershell.c')
| -rw-r--r-- | misc/getusershell.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/misc/getusershell.c b/misc/getusershell.c index 95f0eab..636da32 100644 --- a/misc/getusershell.c +++ b/misc/getusershell.c @@ -46,7 +46,15 @@ static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; * /etc/shells. */ -static const char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; +/* 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; @@ -70,11 +78,9 @@ void endusershell() { - if (shells != NULL) - free(shells); + free(shells); shells = NULL; - if (strings != NULL) - free(strings); + free(strings); strings = NULL; curshell = NULL; } @@ -92,40 +98,39 @@ initshells() register char **sp, *cp; register FILE *fp; struct stat64 statb; - int flen; + size_t flen; - if (shells != NULL) - free(shells); + free(shells); shells = NULL; - if (strings != NULL) - free(strings); + free(strings); strings = NULL; if ((fp = fopen(_PATH_SHELLS, "rc")) == NULL) - return (char **) okshells; + 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 ((strings = malloc((u_int)statb.st_size + 1)) == NULL) { - (void)fclose(fp); - return (char **) okshells; - } - shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); + if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3) + goto init_okshells; + if ((strings = malloc(statb.st_size + 2)) == NULL) + goto init_okshells; + shells = malloc(statb.st_size / 3 * sizeof (char *)); if (shells == NULL) { - (void)fclose(fp); free(strings); strings = NULL; - return (char **) okshells; + goto init_okshells; } - /* No threads using this stream. */ - __fsetlocking (fp, FSETLOCKING_BYCALLER); sp = shells; cp = strings; - flen = statb.st_size; + flen = statb.st_size + 2; while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) { while (*cp != '#' && *cp != '/' && *cp != '\0') cp++; - if (*cp == '#' || *cp == '\0') + if (*cp == '#' || *cp == '\0' || cp[1] == '\0') continue; *sp++ = cp; while (!isspace(*cp) && *cp != '#' && *cp != '\0') |