sbase/chmod.c

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/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "util.h"
static void chmodr(const char *);
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static void parsemode(const char *);
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static bool rflag = false;
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static char oper = '=';
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static mode_t mode = 0;
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static void
usage(void)
{
eprintf("usage: %s [-r] mode [file...]\n", argv0);
}
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int
main(int argc, char *argv[])
{
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ARGBEGIN {
case 'r':
rflag = true;
break;
default:
usage();
} ARGEND;
if(argc < 1)
usage();
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parsemode(argv[0]);
for(++argv; argc > 0; argc--)
chmodr(argv[0]);
return 0;
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}
void
chmodr(const char *path)
{
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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;
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case '=':
st.st_mode = mode;
break;
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}
if(chmod(path, st.st_mode) == -1)
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eprintf("chmod %s:", path);
if(rflag)
recurse(path, chmodr);
}
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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;
}