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@@ -727,66 +727,42 @@ os_lstat(const char* path, u_int64_t *dev, u_int64_t *ino, unsigned int *mode, u |
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727
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727
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char *
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728
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728
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os_file_author(const char *path)
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729
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729
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{
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730
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- int status;
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731
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- struct stat statbuf;
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732
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- char* author = NULL;
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733
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- bool nomem = false;
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734
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- size_t bufsize;
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735
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- char* buf = NULL;
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736
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- char* buf2 = NULL;
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730
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+ struct stat sb;
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731
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+ char initial[1024];
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732
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+ char *buffer, *obuffer;
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733
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+ size_t size;
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737
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734
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struct passwd pwd;
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738
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- struct passwd *result = NULL;
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739
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-
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740
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- status = stat(path, &statbuf);
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735
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+ struct passwd *ppwd;
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736
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+ char *result;
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741
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737
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742
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- if (status != 0) {
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738
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+ if (stat(path, &sb) != 0) {
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743
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739
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return NULL;
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744
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740
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}
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745
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-
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746
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- bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
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747
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-
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748
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- /*
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749
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- * If sysconf fails, just use a small initial buffer size that we
|
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750
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- * will keep growing up to some maximum size.
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751
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- */
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752
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- if (bufsize == -1) {
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753
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- bufsize = 1024;
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754
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- }
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755
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-
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756
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- while (1) {
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757
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- buf2 = realloc(buf, bufsize);
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758
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-
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759
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- if (buf2 == NULL) {
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760
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- result = NULL;
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761
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- nomem = true;
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762
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- break;
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763
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- }
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764
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-
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765
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- buf = buf2;
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766
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- status = getpwuid_r(statbuf.st_uid, &pwd, buf, bufsize, &result);
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767
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-
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768
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- if (status != 0) {
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769
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- result = NULL;
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770
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- }
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771
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- if ((result != NULL) || (status != ERANGE)) {
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772
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- break;
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773
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- }
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774
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- /* If bufsize exceeds some large size, give up. */
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775
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- if (bufsize > 16384) {
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776
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- nomem = true;
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777
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- break;
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741
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+ result = NULL;
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742
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+ buffer = initial;
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743
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+ size = ARRAYSIZE(initial);
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744
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+ assert(sysconf(_SC_GETPW_R_SIZE_MAX) <= 16384));
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745
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+ while (size <= 16384) {
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746
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+ switch (getpwuid_r(sb.st_uid, &pwd, buffer, size, &ppwd)) {
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747
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+ case 0:
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748
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+ /* Success, though we might not have a matching entry */
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749
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+ result = (ppwd == NULL) ? NULL : strdup(pwd.pw_name);
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750
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+ goto exit;
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751
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+ case ERANGE:
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752
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+ /* Buffer is too small, double its size and try again */
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753
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+ size *= 2;
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754
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+ obuffer = (buffer == initial) ? NULL : buffer;
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755
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+ if ((buffer = realloc(obuffer, size)) == NULL) {
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756
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+ free(obuffer);
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757
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+ goto exit;
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758
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+ }
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759
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+ continue;
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760
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+ default:
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761
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+ /* All other errors */
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762
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+ goto exit;
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778
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763
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}
|
|
779
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-
|
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780
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- bufsize <<= 1;
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781
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764
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}
|
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782
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-
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783
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- if (result) {
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784
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- author = strdup(result->pw_name);
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785
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- }
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786
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-
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787
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- if (buf) {
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788
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- free(buf);
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789
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- }
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790
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-
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791
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- return author;
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765
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+exit:
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766
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+ free(buffer);
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767
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+ return result;
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792
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768
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} |