minix/commands/simple/mkdir.c
2009-11-09 10:26:00 +00:00

265 lines
5.4 KiB
C

/* mkdir - Make directories Author: V. Archer */
/* Copyright 1991 by Vincent Archer
* You may freely redistribute this software, in source or binary
* form, provided that you do not alter this copyright mention in any
* way.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <minix/minlib.h>
#include <limits.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
extern int optind, opterr;
extern char *optarg;
#define USR_MODES (S_ISUID|S_IRWXU)
#define GRP_MODES (S_ISGID|S_IRWXG)
#define EXE_MODES (S_IXUSR|S_IXGRP|S_IXOTH)
#ifdef S_ISVTX
#define ALL_MODES (USR_MODES|GRP_MODES|S_IRWXO|S_ISVTX)
#else
#define ALL_MODES (USR_MODES|GRP_MODES|S_IRWXO)
#endif
#define DEFAULT_MODE (S_IRWXU|S_IRWXG|S_IRWXO)
#define USER_WX (S_IWUSR|S_IXUSR)
/* Global variables */
int pflag;
char *symbolic;
mode_t u_mask;
struct stat st;
_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(mode_t parsemode, (char *symbolic, mode_t oldmode));
_PROTOTYPE(int makepath, (char *fordir));
_PROTOTYPE(int makedir, (char *dirname));
_PROTOTYPE(void usage, (void));
/* Parse a P1003.2 4.7.7-conformant symbolic mode. */
mode_t parsemode(char *symbolic, mode_t oldmode)
{
mode_t who, mask, newmode, tmpmask;
char action;
char *end;
unsigned long octalmode;
octalmode = strtoul(symbolic, &end, 010);
if (octalmode < ALL_MODES && *end == 0 && end != symbolic) return octalmode;
newmode = oldmode & ALL_MODES;
while (*symbolic) {
who = 0;
for (; *symbolic; symbolic++) {
if (*symbolic == 'a') {
who |= ALL_MODES;
continue;
}
if (*symbolic == 'u') {
who |= USR_MODES;
continue;
}
if (*symbolic == 'g') {
who |= GRP_MODES;
continue;
}
if (*symbolic == 'o') {
who |= S_IRWXO;
continue;
}
break;
}
if (!*symbolic || *symbolic == ',') usage();
while (*symbolic) {
if (*symbolic == ',') break;
switch (*symbolic) {
default:
usage();
case '+':
case '-':
case '=': action = *symbolic++;
}
mask = 0;
for (; *symbolic; symbolic++) {
if (*symbolic == 'u') {
tmpmask = newmode & S_IRWXU;
mask |= tmpmask | (tmpmask << 3) | (tmpmask << 6);
symbolic++;
break;
}
if (*symbolic == 'g') {
tmpmask = newmode & S_IRWXG;
mask |= tmpmask | (tmpmask >> 3) | (tmpmask << 3);
symbolic++;
break;
}
if (*symbolic == 'o') {
tmpmask = newmode & S_IRWXO;
mask |= tmpmask | (tmpmask >> 3) | (tmpmask >> 6);
symbolic++;
break;
}
if (*symbolic == 'r') {
mask |= S_IRUSR | S_IRGRP | S_IROTH;
continue;
}
if (*symbolic == 'w') {
mask |= S_IWUSR | S_IWGRP | S_IWOTH;
continue;
}
if (*symbolic == 'x') {
mask |= EXE_MODES;
continue;
}
if (*symbolic == 's') {
mask |= S_ISUID | S_ISGID;
continue;
}
if (*symbolic == 'X') {
if (S_ISDIR(oldmode) || (oldmode & EXE_MODES))
mask |= EXE_MODES;
continue;
}
#ifdef S_ISVTX
if (*symbolic == 't') {
mask |= S_ISVTX;
who |= S_ISVTX;
continue;
}
#endif
break;
}
switch (action) {
case '=':
if (who)
newmode &= ~who;
else
newmode = 0;
case '+':
if (who)
newmode |= who & mask;
else
newmode |= mask & (~u_mask);
break;
case '-':
if (who)
newmode &= ~(who & mask);
else
newmode &= ~mask | u_mask;
}
}
if (*symbolic) symbolic++;
}
return(newmode);
}
/* Main module. */
int main(argc, argv)
int argc;
char **argv;
{
int error, c;
opterr = 0;
pflag = 0;
symbolic = (char *) 0;
u_mask = umask(0);
umask(u_mask);
while ((c = getopt(argc, argv, "m:p")) != EOF) switch (c) {
case 'm': symbolic = optarg; break;
case 'p': pflag = 1; break;
default: usage();
}
if (optind >= argc) usage();
error = 0;
while (optind < argc) error |= makedir(argv[optind++]);
return(error);
}
/* P1003.2 requires that missing intermediate pathname components should be
* created if the -p option is specified (4.40.3).
*/
int makepath(fordir)
char *fordir;
{
char parent[PATH_MAX + 1], *end, *last;
strcpy(parent, fordir);
do {
if (!(end = strrchr(parent, '/'))) return(0);
*end = '\0';
if (!parent[0] || !strcmp(parent, ".")) return(0);
} while((last = strrchr(parent, '/')) && !strcmp(last+1, "."));
if (!stat(parent, &st)) {
if (S_ISDIR(st.st_mode)) return(0);
errno = ENOTDIR;
perror(parent);
return(1);
}
if (mkdir(parent, DEFAULT_MODE)) {
if (makepath(parent)) return(1);
if (mkdir(parent, DEFAULT_MODE)) {
perror(parent);
return(1);
}
}
/* P1003.2 states that, regardless of umask() value, intermediate paths
* should have at least write and search (x) permissions (4.40.10).
*/
if ((u_mask & USER_WX) &&
chmod(parent, ((~u_mask) | USER_WX)) & DEFAULT_MODE) {
perror(parent);
return(1);
}
return(0);
}
/* Actual directory creation, using a mkdir() system call. */
int makedir(dirname)
char *dirname;
{
if (mkdir(dirname, DEFAULT_MODE)) {
if (!pflag) {
perror(dirname);
return(1);
}
if (!stat(dirname, &st)) {
if (S_ISDIR(st.st_mode)) return(0);
errno = ENOTDIR;
perror(dirname);
return(1);
}
if (makepath(dirname)) return(1);
if (mkdir(dirname, DEFAULT_MODE)) {
perror(dirname);
return(1);
}
}
if (symbolic && (stat(dirname, &st) ||
chmod(dirname, parsemode(symbolic, st.st_mode)))) {
perror(dirname);
return(1);
}
return(0);
}
/* Posix command prototype. */
void usage()
{
std_err("Usage: mkdir [-p] [-m mode] dir...\n");
exit(1);
}