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perf help: Fix bug when there's no perf-* command around 

main_cmds can be empty - fix util/help.c to handle this case
without segfaulting.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-06-03 20:09:11 +02:00
parent eed4dcd443
commit 051cdc3c2d
1 changed files with 16 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
Documentation/perf_counter/util/help.c
View File

@ -298,7 +298,7 @@ static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
const char *help_unknown_cmd(const char *cmd)
{
int i, n, best_similarity = 0;
int i, n = 0, best_similarity = 0;
struct cmdnames main_cmds, other_cmds;
memset(&main_cmds, 0, sizeof(main_cmds));
@ -315,20 +315,24 @@ const char *help_unknown_cmd(const char *cmd)
sizeof(main_cmds.names), cmdname_compare);
uniq(&main_cmds);
/* This reuses cmdname->len for similarity index */
for (i = 0; i < main_cmds.cnt; ++i)
main_cmds.names[i]->len =
levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
if (main_cmds.cnt) {
/* This reuses cmdname->len for similarity index */
for (i = 0; i < main_cmds.cnt; ++i)
main_cmds.names[i]->len =
levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
qsort(main_cmds.names, main_cmds.cnt,
sizeof(*main_cmds.names), levenshtein_compare);
qsort(main_cmds.names, main_cmds.cnt,
sizeof(*main_cmds.names), levenshtein_compare);
best_similarity = main_cmds.names[0]->len;
n = 1;
while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
++n;
}
best_similarity = main_cmds.names[0]->len;
n = 1;
while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
++n;
if (autocorrect && n == 1) {
const char *assumed = main_cmds.names[0]->name;
main_cmds.names[0] = NULL;
clean_cmdnames(&main_cmds);
fprintf(stderr, "WARNING: You called a Git program named '%s', "
@ -345,7 +349,7 @@ const char *help_unknown_cmd(const char *cmd)
fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
if (best_similarity < 6) {
if (main_cmds.cnt && best_similarity < 6) {
fprintf(stderr, "\nDid you mean %s?\n",
n < 2 ? "this": "one of these");