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Warnings: silence new gcc warnings in uemis-downloader.c

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Since upgrading to gcc 8.2 it produces noisy warnings about
potentially truncated strings. It doesn't recognize that
filenr can never become >4000. So clamp it down explicitly.

Do this by adding a function that does the assembly of the
filename path. Adding unnecessary code to silence compiler warnings
is dubious, but in this case it might be reasonable.

Fix a second instance by increasing the stack-allocated buffer
to 32 bytes. Hopefully nobody has more divespots than would
fit in a 9-decimal digit number!

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-11-18 11:33:50 +01:00 • committed by Dirk Hohndel
parent 0fc58f4534
commit 26a4fb5632
1 changed files with 22 additions and 13 deletions
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35
core/uemis-downloader.c
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@ -516,6 +516,22 @@ static void uemis_increased_timeout(int *timeout)
usleep(*timeout);
}
static char *build_ans_path(const char *path, int filenr)
{
char *intermediate, *ans_path, fl[13];
/* Clamp filenr into the 0..9999 range. This is never necessary,
* as filenr can never go above UEMIS_MAX_FILES, but gcc doesn't
* recognize that and produces very noisy warnings. */
filenr = filenr < 0 ? 0 : filenr % 10000;
snprintf(fl, 13, "ANS%d.TXT", filenr);
intermediate = build_filename(path, "ANS");
ans_path = build_filename(intermediate, fl);
free(intermediate);
return ans_path;
}
/* send a request to the dive computer and collect the answer */
static bool uemis_get_answer(const char *path, char *request, int n_param_in,
int n_param_out, const char **error_text)
@ -583,8 +599,7 @@ static bool uemis_get_answer(const char *path, char *request, int n_param_in,
if (import_thread_cancelled)
return false;
progress_bar_fraction = filenr / (double)UEMIS_MAX_FILES;
snprintf(fl, 13, "ANS%d.TXT", filenr - 1);
ans_path = build_filename(build_filename(path, "ANS"), fl);
ans_path = build_ans_path(path, filenr - 1);
ans_file = subsurface_open(ans_path, O_RDONLY, 0666);
if (ans_file < 0) {
*error_text = "can't open Uemis response file";
@ -648,10 +663,7 @@ static bool uemis_get_answer(const char *path, char *request, int n_param_in,
}
if (ismulti && more_files && tmp[0] == '1') {
int size;
snprintf(fl, 13, "ANS%d.TXT", assembling_mbuf ? filenr - 2 : filenr - 1);
char *intermediate = build_filename(path, "ANS");
ans_path = build_filename(intermediate, fl);
free(intermediate);
ans_path = build_ans_path(path, assembling_mbuf ? filenr - 2 : filenr - 1);
ans_file = subsurface_open(ans_path, O_RDONLY, 0666);
if (ans_file < 0) {
*error_text = "can't open Uemis response file";
@ -688,10 +700,7 @@ static bool uemis_get_answer(const char *path, char *request, int n_param_in,
char *buf = NULL;
if (!ismulti) {
snprintf(fl, 13, "ANS%d.TXT", filenr - 1);
char *intermediate = build_filename(path, "ANS");
ans_path = build_filename(intermediate, fl);
free(intermediate);
ans_path = build_ans_path(path, filenr - 1);
ans_file = subsurface_open(ans_path, O_RDONLY, 0666);
if (ans_file < 0) {
*error_text = "can't open Uemis response file";
@ -701,7 +710,6 @@ static bool uemis_get_answer(const char *path, char *request, int n_param_in,
return false;
}
free(ans_path);
size = bytes_available(ans_file);
if (size > 3) {
int r;
@ -716,10 +724,11 @@ static bool uemis_get_answer(const char *path, char *request, int n_param_in,
buffer_add(&mbuf, &mbuf_size, buf);
show_progress(buf, what);
#if UEMIS_DEBUG & 8
fprintf(debugfile, "::r %s \"%s\"\n", fl, buf);
fprintf(debugfile, "::r %s \"%s\"\n", ans_path, buf);
#endif
}
size -= 3;
free(ans_path);
close(ans_file);
} else {
ismulti = false;
@ -1157,7 +1166,7 @@ static void do_delete_dives(struct dive_table *td, int idx)
static bool load_uemis_divespot(const char *mountpath, int divespot_id)
{
char divespotnr[10];
char divespotnr[32];
snprintf(divespotnr, sizeof(divespotnr), "%d", divespot_id);
param_buff[2] = divespotnr;
#if UEMIS_DEBUG & 2