add buffer size check in find_calibration

Drop find_calibration_by_model function that was occassionally,
as I suppose, marked not static.

src/dcp.c

@@ -12,8 +12,12 @@
 #endif
 
 bool
-find_calibration_by_model(char *conffile, char *model, const char *sensor)
+find_calibration(size_t size, char *conffile, const char *sensor)
 {
+        char model[512];
+        int model_found = libmegapixels_get_model(sizeof(model), model);
+        if(!model_found)
+                return false;
         static const char *paths[] = {
                 "config/%s,%s.dcp",
                 SYSCONFDIR "/megapixels/config/%s,%s.dcp",
@@ -21,27 +25,16 @@ find_calibration_by_model(char *conffile, char *model, const char *sensor)
                 NULL
         };
         for (const char *fmt = paths[0]; fmt; fmt++) {
-                sprintf(conffile, fmt, model, sensor);
+                snprintf(conffile, size, fmt, model, sensor);
                 if (access(conffile, F_OK) != -1) {
                         printf("Found calibration file at %s\n", conffile);
                         return true;
                 }
         }
-
         printf("No calibration found for %s,%s\n", model, sensor);
         return false;
 }
 
-bool
-find_calibration(char *conffile, const char *sensor)
-{
-        char model[512];
-        int model_found = libmegapixels_get_model(sizeof(model), model);
-        if (!model_found)
-            return false;
-        return find_calibration_by_model(conffile, model, sensor);
-}
-
 struct MPCameraCalibration
 parse_calibration_file(const char *path)
 {

src/dcp.h

@@ -19,4 +19,4 @@ struct MPCameraCalibration {
 
 struct MPCameraCalibration parse_calibration_file(const char *path);
 
-bool find_calibration(char *conffile, const char *sensor);
+bool find_calibration(size_t size, char *conffile, const char *sensor);

src/process_pipeline.c

@@ -1567,7 +1567,7 @@ update_state(MPPipeline *pipeline, const mp_state_proc *new_state)
 
         if (camera_changed) {
                 char cf[PATH_MAX];
-                if (find_calibration(cf, state_proc.camera->name)) {
+                if (find_calibration(sizeof(cf), cf, state_proc.camera->name)) {
                         state_proc.calibration = parse_calibration_file(cf);
                 } else {
                         fprintf(stderr, "No calibration for %s\n", state_proc.camera->name);