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http://sourceware.org/ml/gdb-patches/2013-06/msg00788.html
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Subject: [PATCH] "enable count" user input error handling (PR gdb/15678)
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Typing "enable count" by itself crashes GDB. Also, if you omit the
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breakpoint number/range, the error message is not very clear:
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(gdb) enable count 2
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warning: bad breakpoint number at or near ''
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(gdb) enable count
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Segmentation fault (core dumped)
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With this patch, the error messages are slightly more helpful:
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(gdb) enable count 2
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Argument required (one or more breakpoint numbers).
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(gdb) enable count
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Argument required (hit count).
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They are not as helpful to the user as I would like, but it's better
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than crashing. Suggestions are welcome.
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Simon
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gdb/ChangeLog:
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2013-06-26 Simon Marchi <simon.marchi@ericsson.com>
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* breakpoint.c (map_breakpoint_numbers): Check for empty args
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string.
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(enable_count_command): Check args for NULL value.
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gdb/testsuite/ChangeLog:
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2013-06-26 Simon Marchi <simon.marchi@ericsson.com>
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* gdb.base/ena-dis-br.exp: Test "enable count" for bad user input.
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---
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gdb/breakpoint.c | 9 +++++++--
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gdb/testsuite/gdb.base/ena-dis-br.exp | 8 ++++++++
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2 files changed, 15 insertions(+), 2 deletions(-)
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diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
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index ccd05d9..5a0c5ab 100644
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--- a/gdb/breakpoint.c
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+++ b/gdb/breakpoint.c
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@@ -14389,7 +14389,7 @@ map_breakpoint_numbers (char *args, void (*function) (struct breakpoint *,
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int match;
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struct get_number_or_range_state state;
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- if (args == 0)
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+ if (args == 0 || *args == '\0')
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error_no_arg (_("one or more breakpoint numbers"));
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init_number_or_range (&state, args);
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@@ -14713,7 +14713,12 @@ do_map_enable_count_breakpoint (struct breakpoint *bpt, void *countptr)
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static void
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enable_count_command (char *args, int from_tty)
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{
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- int count = get_number (&args);
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+ int count;
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+
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+ if (args == NULL)
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+ error_no_arg (_("hit count"));
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+
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+ count = get_number (&args);
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map_breakpoint_numbers (args, do_map_enable_count_breakpoint, &count);
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}
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diff --git a/gdb/testsuite/gdb.base/ena-dis-br.exp b/gdb/testsuite/gdb.base/ena-dis-br.exp
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index b08b709..82aef64 100644
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--- a/gdb/testsuite/gdb.base/ena-dis-br.exp
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+++ b/gdb/testsuite/gdb.base/ena-dis-br.exp
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@@ -173,6 +173,14 @@ set bp [break_at $bp_location7 "line $bp_location7"]
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set bp2 [break_at marker1 " line ($bp_location15|$bp_location16)"]
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+gdb_test "enable count" \
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+ "Argument required \\(hit count\\)\\." \
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+ "enable count missing arguments"
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+
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+gdb_test "enable count 2" \
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+ "Argument required \\(one or more breakpoint numbers\\)\\." \
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+ "enable count missing last argument"
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+
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gdb_test_no_output "enable count 2 $bp" "disable break with count"
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gdb_test "continue" \
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