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libdivecomputer.c: Try not to pass NULL to fopen()

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C99 7.1.4, says nothing about passing NULL to fopen(),
which means that it isn't portable and there are no guaranties
that the return will be a NULL pointer or that that a library
implementation will not assert or SYSSEGV in the middle of the
fopen() branch.

libdivecomputer.c's 'dumpfile_name' and 'logfile_name' could
cause problems in that regard.

A possible fix for #411

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Lubomir I. Ivanov 2014-01-07 16:41:20 +02:00 committed by Dirk Hohndel
parent 3c794d0275
commit 4d8168cc57
1 changed files with 2 additions and 2 deletions
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4
libdivecomputer.c
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@ -676,7 +676,7 @@ static const char *do_device_import(device_data_t *data)
dc_buffer_t *buffer = dc_buffer_new (0);
rc = dc_device_dump (device, buffer);
if (rc == DC_STATUS_SUCCESS) {
if (rc == DC_STATUS_SUCCESS && dumpfile_name) {
FILE* fp = subsurface_fopen(dumpfile_name, "wb");
if (fp != NULL) {
fwrite (dc_buffer_get_data (buffer), 1, dc_buffer_get_size (buffer), fp);
@ -721,7 +721,7 @@ const char *do_libdivecomputer_import(device_data_t *data)
data->device = NULL;
data->context = NULL;
if (data->libdc_log)
if (data->libdc_log && logfile_name)
fp = subsurface_fopen(logfile_name, "w");
rc = dc_context_new(&data->context);