Fix up stream error handling

src/cubeit.c

@@ -393,7 +393,9 @@ static void *get_image(void *qp)
 
 	/* Get the next filename */
 	if ( read_chunk(qargs->fh, &image) == 1 ) {
-		ERROR("Failed to read chunk from the input stream.\n");
+		if ( ferror(qargs->fh) ) {
+			ERROR("Stream read error.\n");
+		}
 		return NULL;
 	}
 

src/partialator.c

@@ -262,6 +262,10 @@ int main(int argc, char *argv[])
 	}
 
 	n_total_patterns = count_patterns(fh);
+	if ( n_total_patterns == 0 ) {
+		ERROR("No patterns to process.\n");
+		return 1;
+	}
 	STATUS("There are %i patterns to process\n", n_total_patterns);
 
 	images = malloc(n_total_patterns * sizeof(struct image));
@@ -280,7 +284,9 @@ int main(int argc, char *argv[])
 		Reflection *refl;
 		RefListIterator *iter;
 
-		if ( read_chunk(fh, &images[i]) == 1 ) {
+		if ( read_chunk(fh, &images[i]) != 0 ) {
+			/* Should not happen, because we counted the patterns
+			 * earlier. */
 			ERROR("Failed to read chunk from the input stream.\n");
 			return 1;
 		}

src/process_hkl.c

@@ -307,7 +307,7 @@ static void merge_all(FILE *fh, RefList *model,
 
 		/* Get data from next chunk */
 		rval = read_chunk(fh, &image);
-		if ( rval ) continue;
+		if ( rval ) break;
 
 		n_patterns++;
 
@@ -509,6 +509,10 @@ int main(int argc, char *argv[])
 
 	/* Count the number of patterns in the file */
 	n_total_patterns = count_patterns(fh);
+	if ( n_total_patterns == 0 ) {
+		ERROR("No patterns to process.\n");
+		return 1;
+	}
 	STATUS("There are %i patterns to process\n", n_total_patterns);
 	rewind(fh);
 
@@ -536,6 +540,10 @@ int main(int argc, char *argv[])
 	          config_startafter, config_stopafter,
                   sym, n_total_patterns,
                   hist_vals, hist_h, hist_k, hist_l, &hist_i, 1);
+	if ( ferror(fh) ) {
+		ERROR("Stream read error.\n");
+		return 1;
+	}
 	rewind(fh);
 	if ( space_for_hist && (hist_i >= space_for_hist) ) {
 		ERROR("Histogram array was too small!\n");
@@ -552,6 +560,10 @@ int main(int argc, char *argv[])
 	merge_all(fh, model, config_maxonly, config_scale, 0,
 	          config_startafter, config_stopafter, sym, n_total_patterns,
 	          NULL, 0, 0, 0, NULL, 2);
+	if ( ferror(fh) ) {
+		ERROR("Stream read error.\n");
+		return 1;
+	}
 
 	write_reflist(output, model, cell);
 

src/stream.c

@@ -129,6 +129,11 @@ int count_patterns(FILE *fh)
 
 	} while ( rval != NULL );
 
+	if ( ferror(fh) ) {
+		ERROR("Read error while counting patterns.\n");
+		return 0;
+	}
+
 	return n_total_patterns;
 }
 
@@ -319,7 +324,7 @@ int read_chunk(FILE *fh, struct image *image)
 		rval = fgets(line, 1023, fh);
 
 		/* Trouble? */
-		if ( rval == NULL ) return 1;
+		if ( rval == NULL ) break;
 
 		chomp(line);
 
@@ -378,12 +383,16 @@ int read_chunk(FILE *fh, struct image *image)
 			}
 		}
 
-	} while ( strcmp(line, CHUNK_END_MARKER) != 0 );
+		if ( strcmp(line, CHUNK_END_MARKER) == 0 ) {
+			if ( have_filename && have_ev ) return 0;
+			ERROR("Incomplete chunk found in input file.\n");
+			return 1;
+		}
 
-	if ( have_filename && have_ev ) return 0;
+	} while ( 1 );
 
-	ERROR("Incomplete chunk found in input file.\n");
-	return 1;
+	return 1;  /* Either error or EOF, don't care because we will complain
+	            * on the terminal if it was an error. */
 }