102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include "../util.h"
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mode_t
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getumask(void)
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{
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mode_t mask = umask(0);
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umask(mask);
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return mask;
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}
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mode_t
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parsemode(const char *str, mode_t mode, mode_t mask)
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{
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char *end;
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const char *p;
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int octal, op = '+';
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mode_t gmask = 0, m = 0;
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octal = strtol(str, &end, 8);
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if(*end == '\0') {
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if(octal < 0 || octal > 07777) {
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eprintf("%s: invalid mode\n", str);
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return -1;
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}
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mode = 0;
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if(octal & 04000) mode |= S_ISUID;
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if(octal & 02000) mode |= S_ISGID;
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if(octal & 01000) mode |= S_ISVTX;
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if(octal & 00400) mode |= S_IRUSR;
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if(octal & 00200) mode |= S_IWUSR;
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if(octal & 00100) mode |= S_IXUSR;
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if(octal & 00040) mode |= S_IRGRP;
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if(octal & 00020) mode |= S_IWGRP;
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if(octal & 00010) mode |= S_IXGRP;
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if(octal & 00004) mode |= S_IROTH;
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if(octal & 00002) mode |= S_IWOTH;
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if(octal & 00001) mode |= S_IXOTH;
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return mode;
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}
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for(p = str; *p; p++) {
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switch(*p) {
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/* masks */
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case 'u':
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gmask |= S_IRWXU;
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break;
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case 'g':
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gmask |= S_IRWXG;
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break;
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case 'o':
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gmask |= S_IRWXO;
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break;
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case 'a':
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gmask |= S_IRWXU|S_IRWXG|S_IRWXO;
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break;
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/* opers */
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case '=':
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case '+':
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case '-':
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op = (int)*p;
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break;
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/* modes */
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case 'r':
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m |= S_IRUSR|S_IRGRP|S_IROTH;
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break;
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case 'w':
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m |= S_IWUSR|S_IWGRP|S_IWOTH;
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break;
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case 'x':
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m |= S_IXUSR|S_IXGRP|S_IXOTH;
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break;
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case 's':
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m |= S_ISUID|S_ISGID;
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break;
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case 't':
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m |= S_ISVTX;
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break;
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default:
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eprintf("%s: invalid mode\n", str);
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return -1;
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}
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/* apply */
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switch(op) {
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case '+':
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mode |= (m & ((~mask) & 0777));
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break;
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case '-':
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mode &= (~(m & ((~mask) & 0777)));
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break;
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case '=':
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mode = (m & ((~mask) & 0777));
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break;
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}
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}
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if(gmask && op != '=')
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mode &= ~gmask;
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return mode;
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}
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