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| author | Tom Tromey <tom@tromey.com> | 2018-02-14 20:11:16 -0700 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2018-03-14 09:44:34 -0600 |
| commit | 3ae9ce5dd7d1119ca2c94c63a07b04921048ebe3 (patch) | |
| tree | 9f4dd07f3fb68d454f5718f1c1816996a0a4441e /gdb | |
| parent | b8c2339b2f46d4885b933b832fc5b37c7ca101a6 (diff) | |
| download | gdb-3ae9ce5dd7d1119ca2c94c63a07b04921048ebe3.zip gdb-3ae9ce5dd7d1119ca2c94c63a07b04921048ebe3.tar.gz gdb-3ae9ce5dd7d1119ca2c94c63a07b04921048ebe3.tar.bz2 | |
Special case NULL when using printf's %s format
This changes the printf command's %s and %ls formats to special-case
NULL, and print "(null)" for these. This is PR cli/14977. This
behavior seems a bit friendlier; I was undecided on whether other
invalid pointers should be handled specially somehow, so for the time
being I've left those out.
gdb/ChangeLog
2018-03-14 Tom Tromey <tom@tromey.com>
PR cli/14977:
* printcmd.c (printf_c_string, printf_wide_c_string): Special case
for NULL.
gdb/gdbserver/ChangeLog
2018-03-14 Tom Tromey <tom@tromey.com>
PR cli/14977:
* ax.c (ax_printf): Special case for NULL.
gdb/testsuite/ChangeLog
2018-03-14 Tom Tromey <tom@tromey.com>
PR cli/14977:
* gdb.base/printcmds.exp (test_printf): Add printf test of %s with
a null pointer.
* gdb.base/wchar.exp: Likewise.
Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/ChangeLog | 6 | ||||
| -rw-r--r-- | gdb/gdbserver/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/gdbserver/ax.c | 5 | ||||
| -rw-r--r-- | gdb/printcmd.c | 10 | ||||
| -rw-r--r-- | gdb/testsuite/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/printcmds.exp | 3 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/wchar.exp | 3 |
7 files changed, 39 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index da59b39..a62255f 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,11 @@ 2018-03-14 Tom Tromey <tom@tromey.com> + PR cli/14977: + * printcmd.c (printf_c_string, printf_wide_c_string): Special case + for NULL. + +2018-03-14 Tom Tromey <tom@tromey.com> + PR cli/19918: * printcmd.c (printf_pointer): Allow "-" in format. diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 053cf17..2be87a6 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,8 @@ +2018-03-14 Tom Tromey <tom@tromey.com> + + PR cli/14977: + * ax.c (ax_printf): Special case for NULL. + 2018-03-08 Simon Marchi <simon.marchi@polymtl.ca> * linux-low.c (linux_qxfer_libraries_svr4): Use diff --git a/gdb/gdbserver/ax.c b/gdb/gdbserver/ax.c index b42ee54..c754383 100644 --- a/gdb/gdbserver/ax.c +++ b/gdb/gdbserver/ax.c @@ -847,6 +847,11 @@ ax_printf (CORE_ADDR fn, CORE_ADDR chan, const char *format, int j; tem = args[i]; + if (tem == 0) + { + printf (current_substring, "(null)"); + break; + } /* This is a %s argument. Find the length of the string. */ for (j = 0;; j++) diff --git a/gdb/printcmd.c b/gdb/printcmd.c index 17c67ee..9fb2e02 100644 --- a/gdb/printcmd.c +++ b/gdb/printcmd.c @@ -2220,6 +2220,11 @@ printf_c_string (struct ui_file *stream, const char *format, int j; tem = value_as_address (value); + if (tem == 0) + { + fprintf_filtered (stream, format, "(null)"); + return; + } /* This is a %s argument. Find the length of the string. */ for (j = 0;; j++) @@ -2260,6 +2265,11 @@ printf_wide_c_string (struct ui_file *stream, const char *format, gdb_byte *buf = (gdb_byte *) alloca (wcwidth); tem = value_as_address (value); + if (tem == 0) + { + fprintf_filtered (stream, format, "(null)"); + return; + } /* This is a %s argument. Find the length of the string. */ for (j = 0;; j += wcwidth) diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index abac29f..f31f91e 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,5 +1,12 @@ 2018-03-14 Tom Tromey <tom@tromey.com> + PR cli/14977: + * gdb.base/printcmds.exp (test_printf): Add printf test of %s with + a null pointer. + * gdb.base/wchar.exp: Likewise. + +2018-03-14 Tom Tromey <tom@tromey.com> + PR cli/19918: * gdb.base/printcmds.exp (test_printf): Add printf test using '-' flag. diff --git a/gdb/testsuite/gdb.base/printcmds.exp b/gdb/testsuite/gdb.base/printcmds.exp index 56cedb9..635bd62 100644 --- a/gdb/testsuite/gdb.base/printcmds.exp +++ b/gdb/testsuite/gdb.base/printcmds.exp @@ -780,6 +780,9 @@ proc test_printf {} { # PR cli/19918. gdb_test "printf \"%-16dq\\n\", 0" "0 q" gdb_test "printf \"%-16pq\\n\", 0" "\\(nil\\) q" + + # PR cli/14977. + gdb_test "printf \"%s\\n\", 0" "\\(null\\)" } #Test printing DFP values with printf diff --git a/gdb/testsuite/gdb.base/wchar.exp b/gdb/testsuite/gdb.base/wchar.exp index 80b6513..a4d9bce 100644 --- a/gdb/testsuite/gdb.base/wchar.exp +++ b/gdb/testsuite/gdb.base/wchar.exp @@ -69,3 +69,6 @@ gdb_test "print repeat" "= L\"A$cent$cent\"\.\.\." \ gdb_test "print repeat_p" "= $hex L\"A$cent$cent\"\.\.\." \ "print repeat_p (print elements 3)" + +# From PR cli/14977, but here because it requires wchar_t. +gdb_test "printf \"%ls\\n\", 0" "\\(null\\)" |