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uemis-downloader: make newmax an integer variable

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newmax was an integer variable kept as a string. Very ominous.

Moreover, memory management seems to be broken:

1) The string is never freed.

2) The string is passed as value from do_uemis_import() to
   get_matching_dives(), which passes it as reference to
   process_raw_buffer(), which may reallocate it, which means
   that do_uemis_import() now possesses a pointer to a free()d
   string.

Simplify all that by making newmax an integer variable and
passing it as a reference from do_uemis_import() to
get_matching_dives().

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-04-25 06:25:36 +02:00
parent 275d52c4a5
commit b5f0e18ca8
1 changed files with 19 additions and 22 deletions
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41
core/uemis-downloader.cpp
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@ -873,7 +873,7 @@ static bool uemis_delete_dive(device_data_t *devdata, uint32_t diveid)
* index into yet another data store that we read out later. In order to * index into yet another data store that we read out later. In order to
* correctly populate the location and gps data from that we need to remember * correctly populate the location and gps data from that we need to remember
* the addresses of those fields for every dive that references the dive spot. */ * the addresses of those fields for every dive that references the dive spot. */
static bool process_raw_buffer(device_data_t *devdata, uint32_t deviceid, char *inbuf, char **max_divenr, int *for_dive) static bool process_raw_buffer(device_data_t *devdata, uint32_t deviceid, char *inbuf, int &max_divenr, int *for_dive)
{ {
char *buf = strdup(inbuf); char *buf = strdup(inbuf);
char *tp, *bp, *tag, *type, *val; char *tp, *bp, *tag, *type, *val;
@ -978,9 +978,7 @@ static bool process_raw_buffer(device_data_t *devdata, uint32_t deviceid, char *
report_info("Parsed %s, %s, %s\n*************************\n", tag, type, val); report_info("Parsed %s, %s, %s\n*************************\n", tag, type, val);
#endif #endif
if (is_log && strcmp(tag, "object_id") == 0) { if (is_log && strcmp(tag, "object_id") == 0) {
free(*max_divenr); dive->dc.diveid = max_divenr = atoi(val);
*max_divenr = strdup(val);
dive->dc.diveid = atoi(val);
#if UEMIS_DEBUG % 2 #if UEMIS_DEBUG % 2
report_info("Adding new dive from log with object_id %d.\n", atoi(val)); report_info("Adding new dive from log with object_id %d.\n", atoi(val));
#endif #endif
@ -1030,11 +1028,10 @@ static bool process_raw_buffer(device_data_t *devdata, uint32_t deviceid, char *
return true; return true;
} }
static char *uemis_get_divenr(char *deviceidstr, struct dive_table *table, int force) static int uemis_get_divenr(char *deviceidstr, struct dive_table *table, int force)
{ {
uint32_t deviceid, maxdiveid = 0; uint32_t deviceid, maxdiveid = 0;
int i; int i;
char divenr[10];
deviceid = atoi(deviceidstr); deviceid = atoi(deviceidstr);
mindiveid = 0xFFFFFFFF; mindiveid = 0xFFFFFFFF;
@ -1066,8 +1063,7 @@ static char *uemis_get_divenr(char *deviceidstr, struct dive_table *table, int f
} }
} }
} }
snprintf(divenr, 10, "%d", maxdiveid); return maxdiveid;
return strdup(divenr);
} }
#if UEMIS_DEBUG #if UEMIS_DEBUG
@ -1211,7 +1207,7 @@ static void get_uemis_divespot(device_data_t *devdata, const char *mountpath, in
} }
} }
static bool get_matching_dive(int idx, char *newmax, int *uemis_mem_status, device_data_t *data, const char *mountpath, const char deviceidnr) static bool get_matching_dive(int idx, int &newmax, int *uemis_mem_status, device_data_t *data, const char *mountpath, const char deviceidnr)
{ {
struct dive *dive = data->log->dives->dives[idx]; struct dive *dive = data->log->dives->dives[idx];
char log_file_no_to_find[20]; char log_file_no_to_find[20];
@ -1249,7 +1245,7 @@ static bool get_matching_dive(int idx, char *newmax, int *uemis_mem_status, devi
* we mark the search successful even if the dive has been deleted. */ * we mark the search successful even if the dive has been deleted. */
found = true; found = true;
if (strstr(mbuf, "deleted{bool{true") == NULL) { if (strstr(mbuf, "deleted{bool{true") == NULL) {
process_raw_buffer(data, deviceidnr, mbuf, &newmax, NULL); process_raw_buffer(data, deviceidnr, mbuf, newmax, NULL);
/* remember the last log file number as it is very likely that subsequent dives /* remember the last log file number as it is very likely that subsequent dives
* have the same or higher logfile number. * have the same or higher logfile number.
* UEMIS unfortunately deletes dives by deleting the dive details and not the logs. */ * UEMIS unfortunately deletes dives by deleting the dive details and not the logs. */
@ -1271,7 +1267,7 @@ static bool get_matching_dive(int idx, char *newmax, int *uemis_mem_status, devi
/* mark this log entry as deleted and cleanup later, otherwise we mess up our array */ /* mark this log entry as deleted and cleanup later, otherwise we mess up our array */
dive->hidden_by_filter = true; dive->hidden_by_filter = true;
#if UEMIS_DEBUG & 2 #if UEMIS_DEBUG & 2
report_info("Deleted dive from %s, with id %d from table -- newmax is %s\n", d_time.c_str(), dive->dc.diveid, newmax); report_info("Deleted dive from %s, with id %d from table -- newmax is %d\n", d_time.c_str(), dive->dc.diveid, newmax);
#endif #endif
} }
} else { } else {
@ -1315,7 +1311,7 @@ const char *do_uemis_import(device_data_t *data)
{ {
const char *mountpath = data->devname; const char *mountpath = data->devname;
short force_download = data->force_download; short force_download = data->force_download;
char *newmax = NULL; int newmax = -1;
int first, start, end = -2; int first, start, end = -2;
uint32_t deviceidnr; uint32_t deviceidnr;
char *deviceid = NULL; char *deviceid = NULL;
@ -1361,9 +1357,9 @@ const char *do_uemis_import(device_data_t *data)
param_buff[1] = "notempty"; param_buff[1] = "notempty";
newmax = uemis_get_divenr(deviceid, data->log->dives, force_download); newmax = uemis_get_divenr(deviceid, data->log->dives, force_download);
if (verbose) if (verbose)
report_info("Uemis downloader: start looking at dive nr %s", newmax); report_info("Uemis downloader: start looking at dive nr %d", newmax);
first = start = atoi(newmax); first = start = newmax;
dive_to_read = (int)mindiveid < first ? first - mindiveid : first; dive_to_read = (int)mindiveid < first ? first - mindiveid : first;
if (dive_offset > 0) if (dive_offset > 0)
start += dive_offset; start += dive_offset;
@ -1372,12 +1368,13 @@ const char *do_uemis_import(device_data_t *data)
debug_round++; debug_round++;
#endif #endif
#if UEMIS_DEBUG & 4 #if UEMIS_DEBUG & 4
report_info("d_u_i inner loop start %d end %d newmax %s\n", start, end, newmax); report_info("d_u_i inner loop start %d end %d newmax %d\n", start, end, newmax);
#endif #endif
/* start at the last filled download table index */ /* start at the last filled download table index */
match_dive_and_log = data->log->dives->nr; match_dive_and_log = data->log->dives->nr;
sprintf(newmax, "%d", start); newmax = start;
param_buff[2] = newmax; std::string newmax_str = std::to_string(newmax);
param_buff[2] = newmax_str.c_str();
param_buff[3] = 0; param_buff[3] = 0;
success = uemis_get_answer(mountpath, "getDivelogs", 3, 0, &result); success = uemis_get_answer(mountpath, "getDivelogs", 3, 0, &result);
uemis_mem_status = get_memory(data->log->dives, UEMIS_CHECK_DETAILS); uemis_mem_status = get_memory(data->log->dives, UEMIS_CHECK_DETAILS);
@ -1390,7 +1387,7 @@ const char *do_uemis_import(device_data_t *data)
do_dump_buffer_to_file(realmbuf, "Dive logs"); do_dump_buffer_to_file(realmbuf, "Dive logs");
#endif #endif
/* process the buffer we have assembled */ /* process the buffer we have assembled */
if (!process_raw_buffer(data, deviceidnr, realmbuf, &newmax, NULL)) { if (!process_raw_buffer(data, deviceidnr, realmbuf, newmax, NULL)) {
/* if no dives were downloaded, mark end appropriately */ /* if no dives were downloaded, mark end appropriately */
if (end == -2) if (end == -2)
end = start - 1; end = start - 1;
@ -1408,9 +1405,9 @@ const char *do_uemis_import(device_data_t *data)
if (endptr) if (endptr)
*(endptr + 2) = '\0'; *(endptr + 2) = '\0';
/* last object_id we parsed */ /* last object_id we parsed */
sscanf(newmax, "%d", &end); end = newmax;
#if UEMIS_DEBUG & 4 #if UEMIS_DEBUG & 4
report_info("d_u_i after download and parse start %d end %d newmax %s progress %4.2f\n", start, end, newmax, progress_bar_fraction); report_info("d_u_i after download and parse start %d end %d newmax %d progress %4.2f\n", start, end, newmax, progress_bar_fraction);
#endif #endif
/* The way this works is that I am reading the current dive from what has been loaded during the getDiveLogs call to the UEMIS. /* The way this works is that I am reading the current dive from what has been loaded during the getDiveLogs call to the UEMIS.
* As the object_id of the dive log entry and the object_id of the dive details are not necessarily the same, the match needs * As the object_id of the dive log entry and the object_id of the dive details are not necessarily the same, the match needs
@ -1494,8 +1491,8 @@ const char *do_uemis_import(device_data_t *data)
} }
} }
if (end == -2 && sscanf(newmax, "%d", &end) != 1) if (end == -2)
end = start; end = newmax;
#if UEMIS_DEBUG & 2 #if UEMIS_DEBUG & 2
report_info("Done: read from object_id %d to %d\n", first, end); report_info("Done: read from object_id %d to %d\n", first, end);