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libpwdgrp: fixes suggested by Tito, comment tweaks
function old new delta bb_internal_getpwent_r 100 121 +21 parse_common 202 203 +1 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -9,13 +9,13 @@
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* Rewrite of some parts. Main differences are:
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*
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* 1) the buffer for getpwuid, getgrgid, getpwnam, getgrnam is dynamically
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* allocated and reused by later calls.
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* allocated.
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* If ENABLE_FEATURE_CLEAN_UP is set the buffers are freed at program
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* exit using the atexit function to make valgrind happy.
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* 2) the passwd/group files:
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* a) must contain the expected number of fields (as per count of field
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* delimeters ":") or we will complain with a error message.
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* b) leading or trailing whitespace in fields is stripped.
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* b) leading and trailing whitespace in fields is stripped.
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* c) some fields are not allowed to be empty (e.g. username, uid/gid,
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* homedir, shell) and in this case NULL is returned and errno is
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* set to EINVAL. This behaviour could be easily changed by
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@ -23,7 +23,7 @@
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* makes a field mandatory).
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* d) the string representing uid/gid must be convertible by strtoXX
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* functions, or errno is set to EINVAL.
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* e) leading or trailing whitespace in group member names are stripped.
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* e) leading and trailing whitespace in group member names is stripped.
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* 3) the internal function for getgrouplist uses dynamically allocated buffer.
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* 4) at the moment only the functions really used by busybox code are
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* implemented, if you need a particular missing function it should be
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@ -34,15 +34,15 @@
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struct const_passdb {
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const char *filename;
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const char def[7 + 2*ENABLE_USE_BB_SHADOW];
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const uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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char def[7 + 2*ENABLE_USE_BB_SHADOW];
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uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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uint8_t numfields;
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uint8_t size_of;
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};
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struct passdb {
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const char *filename;
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const char def[7 + 2*ENABLE_USE_BB_SHADOW];
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const uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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char def[7 + 2*ENABLE_USE_BB_SHADOW];
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uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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uint8_t numfields;
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uint8_t size_of;
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FILE *fp;
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@ -105,7 +105,7 @@ static const struct const_passdb const_sp_db = {
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/* We avoid having big global data. */
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struct statics {
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/* It's ok to use same buffer (db[0].malloced) for getpwuid and getpwnam.
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/* We use same buffer (db[0].malloced) for getpwuid and getpwnam.
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* Manpage says:
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* "The return value may point to a static area, and may be overwritten
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* by subsequent calls to getpwent(), getpwnam(), or getpwuid()."
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@ -203,7 +203,7 @@ static char *parse_common(FILE *fp, struct passdb *db,
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goto free_and_next;
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}
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if (!key) {
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if (field_pos == -1) {
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/* no key specified: sequential read, return a record */
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break;
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}
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@ -292,7 +292,6 @@ static void *convert_to_struct(struct passdb *db,
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( ((intptr_t)S.tokenize_end + sizeof(members[0]))
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& -(intptr_t)sizeof(members[0])
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);
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((struct group *)result)->gr_mem = members;
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while (--i >= 0) {
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if (buffer[0]) {
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@ -391,7 +390,9 @@ static int FAST_FUNC getXXent_r(uintptr_t db_idx, char *buffer, size_t buflen,
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close_on_exec_on(fileno(db->fp));
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}
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buf = parse_common(db->fp, db, /*no search key:*/ NULL, 0);
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buf = parse_common(db->fp, db, /*no search key:*/ NULL, -1);
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if (!buf && !errno)
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errno = ENOENT;
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return massage_data_for_r_func(db, buffer, buflen, result, buf);
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}
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@ -493,7 +494,7 @@ static gid_t* FAST_FUNC getgrouplist_internal(int *ngroups_ptr,
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if (fp) {
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struct passdb *db = &get_S()->db[1];
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char *buf;
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while ((buf = parse_common(fp, db, NULL, 0)) != NULL) {
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while ((buf = parse_common(fp, db, NULL, -1)) != NULL) {
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char **m;
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struct group group;
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if (!convert_to_struct(db, buf, &group))
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@ -505,7 +506,7 @@ static gid_t* FAST_FUNC getgrouplist_internal(int *ngroups_ptr,
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continue;
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group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
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group_list[ngroups++] = group.gr_gid;
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break;
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goto next;
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}
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next:
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free(buf);
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