96 lines
1.4 KiB
C
96 lines
1.4 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "parse_mode.h"
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#define U (S_ISUID | S_IRWXU)
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#define G (S_ISGID | S_IRWXG)
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#define O (S_IRWXO)
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#define A (U | G | O)
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#define WR_PERM (S_IWUSR | S_IWGRP | S_IWOTH)
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#define EX_PERM (S_IXUSR | S_IXGRP | S_IXOTH)
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#define RD_PERM (S_IRUSR | S_IRGRP | S_IROTH)
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#define SU_PERM (S_ISUID | S_ISGID | S_ISVTX)
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#define FULL_PERM (WR_PERM | EX_PERM | RD_PERM)
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mode_t mu_parse_mode(const char *s, mode_t cur_mode) {
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char *p = NULL;
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mode_t mode = (mode_t)strtol(s, &p, 8);
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if (!*p && mode < 07777U)
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return mode;
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else if (mode > 07777U)
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return 0;
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mode = 0;
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/* Default + */
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char append = 1;
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mode_t mask = 0;
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for (size_t i = 0; i < strlen(s); i++) {
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switch (s[i]) {
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case 'r':
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mode |= RD_PERM;
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break;
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case 'w':
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mode |= WR_PERM;
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break;
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case 'x':
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mode |= EX_PERM;
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break;
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case 's':
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mode |= SU_PERM;
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break;
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case '+':
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append = 1;
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break;
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case '-':
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append = 0;
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break;
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case '=':
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append = 2;
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break;
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case 'g':
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mask |= G;
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break;
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case 'u':
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mask |= U;
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break;
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case 'o':
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mask |= O;
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break;
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case 'a':
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mask |= A;
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break;
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default:
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return 0;
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}
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}
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if (mask == 0)
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mask = U;
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mask &= mode;
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if (append == 0)
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mode = ~mode;
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if (append == 2)
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return mode & mask;
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else
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return (cur_mode & ~mask) | (mode & mask);
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}
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