Hard to hit. Nevertheless it seems better to error out than to crash in strcmp()
Index: seq.c =================================================================== RCS file: /cvs/src/usr.bin/seq/seq.c,v retrieving revision 1.3 diff -u -p -r1.3 seq.c --- seq.c 22 Feb 2022 16:14:38 -0000 1.3 +++ seq.c 22 Feb 2022 16:23:08 -0000 @@ -195,8 +195,9 @@ main(int argc, char *argv[]) * loop held true due to a rounding error and we still need to print * 'last'. */ - asprintf(&cur_print, fmt, cur); - asprintf(&last_print, fmt, last); + if (asprintf(&cur_print, fmt, cur) == -1 || + asprintf(&last_print, fmt, last) == -1) + err(1, "asprintf"); if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) { if (cur != first) fputs(sep, stdout);