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symbolic chmod, thanks pancake

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This commit is contained in:
Connor Lane Smith
2011-06-11 00:30:07 +01:00
parent ea7a807a6d
commit 26723ba0dc
3 changed files with 138 additions and 24 deletions
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98
chmod.c
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@@ -7,15 +7,16 @@
#include "util.h"
static void chmodr(const char *);
static void parsemode(const char *);
static bool rflag = false;
static char oper = '=';
static mode_t mode = 0;
int
main(int argc, char *argv[])
{
char c;
int octal;
while((c = getopt(argc, argv, "Rr")) != -1)
switch(c) {
@@ -28,21 +29,8 @@ main(int argc, char *argv[])
}
if(optind == argc)
eprintf("usage: %s [-Rr] mode [file...]\n", argv[0]);
octal = estrtol(argv[optind++], 8);
/* posix doesn't specify modal bits */
if(octal & 04000) mode |= S_ISUID;
if(octal & 02000) mode |= S_ISGID;
if(octal & 00400) mode |= S_IRUSR;
if(octal & 00200) mode |= S_IWUSR;
if(octal & 00100) mode |= S_IXUSR;
if(octal & 00040) mode |= S_IRGRP;
if(octal & 00020) mode |= S_IWGRP;
if(octal & 00010) mode |= S_IXGRP;
if(octal & 00004) mode |= S_IROTH;
if(octal & 00002) mode |= S_IWOTH;
if(octal & 00001) mode |= S_IXOTH;
parsemode(argv[optind++]);
for(; optind < argc; optind++)
chmodr(argv[optind]);
return EXIT_SUCCESS;
@@ -51,8 +39,86 @@ main(int argc, char *argv[])
void
chmodr(const char *path)
{
if(chmod(path, mode) == -1)
struct stat st;
if(stat(path, &st) == -1)
eprintf("stat %s:", path);
switch(oper) {
case '+':
st.st_mode |= mode;
break;
case '-':
st.st_mode &= ~mode;
break;
}
if(chmod(path, st.st_mode) == -1)
eprintf("chmod %s:", path);
if(rflag)
recurse(path, chmodr);
}
void
parsemode(const char *str)
{
char *end;
const char *p;
int octal;
mode_t mask = 0;
octal = strtol(str, &end, 8);
if(*end == '\0') {
if(octal & 04000) mode |= S_ISUID;
if(octal & 02000) mode |= S_ISGID;
if(octal & 00400) mode |= S_IRUSR;
if(octal & 00200) mode |= S_IWUSR;
if(octal & 00100) mode |= S_IXUSR;
if(octal & 00040) mode |= S_IRGRP;
if(octal & 00020) mode |= S_IWGRP;
if(octal & 00010) mode |= S_IXGRP;
if(octal & 00004) mode |= S_IROTH;
if(octal & 00002) mode |= S_IWOTH;
if(octal & 00001) mode |= S_IXOTH;
return;
}
for(p = str; *p; p++)
switch(*p) {
/* masks */
case 'u':
mask |= S_IRWXU;
break;
case 'g':
mask |= S_IRWXG;
break;
case 'o':
mask |= S_IRWXO;
break;
case 'a':
mask |= S_IRWXU|S_IRWXG|S_IRWXO;
break;
/* opers */
case '+':
case '-':
case '=':
oper = *p;
break;
/* modes */
case 'r':
mode |= S_IRUSR|S_IRGRP|S_IROTH;
break;
case 'w':
mode |= S_IWUSR|S_IWGRP|S_IWOTH;
break;
case 'x':
mode |= S_IXUSR|S_IXGRP|S_IXOTH;
break;
case 's':
mode |= S_ISUID|S_ISGID;
break;
/* error */
default:
eprintf("%s: invalid mode\n", str);
}
if(mask)
mode &= mask;
}