lib/libutil/gr_util.c

52 static size_t grmemlen(const struct group *, const char *, int *);
53 static struct group *grcopy(const struct group *gr, char *mem, const char *, int ndx);
59 gr_init(const char *dir, const char *group)
72 	if (group == NULL) {
75 		} else if (snprintf(group_file, sizeof(group_file), "%s/group",
81 		if (strlen(group) >= sizeof(group_file)) {
85 		strcpy(group_file, group);
93  * Lock the group file
107 				errx(1, "the group file is busy");
109 				err(1, "could not lock the group file: ");
123  * Create and open a presmuably safe temp file for editing group data
161  * Copy the group file from one descriptor to another, replacing, deleting
165 gr_copy(int ffd, int tfd, const struct group *gr, struct group *old_gr)
168 	struct group *fgr;
169 	const struct group *sgr;
178 	/* deleting a group */
186 	/* adding a group */
209 					warnx("group line too long");
259 		/* fgr is either a struct group for the current line,
327  * Regenerate the group file
341 	 * Make sure new group file is safe on disk. To improve performance we
378  * Compares two struct group's.
381 gr_equal(const struct group *gr1, const struct group *gr2)
429  * Make a group line out of a struct group.
432 gr_make(const struct group *gr)
441 	/* Calculate the length of the group line. */
451 	/* Create the group line and fill it. */
469  * Duplicate a struct group.
471 struct group *
472 gr_dup(const struct group *gr)
477  * Add a new member name to a struct group.
479 struct group *
480 gr_add(const struct group *gr, const char *newmember)
488 	/* Create new group and copy old group into it. */
495  * guarantee the gr_mem + strings are contiguous in the given struct group
496  * but compactify the new group into the following form.
499  * for a group with two members only.
505  * (gr_mem * newgrp + sizeof(struct group) + sizeof(**)) points to gr_mem area
517  * Copy the contents of a group plus given name to a preallocated group struct
519 static struct group *
520 grcopy(const struct group *gr, char *dst, const char *name, int ndx)
523 	struct group *newgr;
525 	newgr = (struct group *)(void *)dst;	/* avoid alignment warning */
544 	/* Original group struct might have a NULL gr_mem */
564  *  Calculate length of a struct group + given name
567 grmemlen(const struct group *gr, const char *name, int *num_mem)
574 	/* Calculate size of the group. */
600  * Scan a line and place it into a group structure.
603 __gr_scan(char *line, struct group *gr)
646  * Create a struct group from a line.
648 struct group *
651 	struct group gr;
653 	struct group *new_gr;