Terminate error messages with newlines

CHANGELOG.md

@@ -4,6 +4,7 @@
 * Output dimension will be exactly `-s` instead of rounding `-s` to some multiple of swash count
 * Succeed even when swatch width is larger than 259 pixels
 * Improved compression
+* Terminate error messages with newlines
 
 ## [v2023.03.07] 2023-03-07
 Initial release

src/main/c/bitstream.c

@@ -36,7 +36,7 @@ void bitstream_extend(struct Bitstream *const this, const size_t min_capacity) {
 	if (this->bufferc < min_capacity) {
 		this->bufferv = realloc(this->bufferv, min_capacity);
 		if (! (this->bufferv)) {
-			fprintf(stderr, "memory allocation failure");
+			fprintf(stderr, "memory allocation failure\n");
 			exit(1);
 		}
 		for (size_t i = this->bufferc; i < min_capacity; i++) {

src/main/c/deflate.c

@@ -41,18 +41,18 @@ struct BitStrShort encode_fixed_huffman_code(uint16_t value) {
 		bitstr_reverse(&retval);
 		return retval;
 	} else {
-		fprintf(stderr, "Value error: encode_fixed_huffman_codes value exceeded 285");
+		fprintf(stderr, "Value error: encode_fixed_huffman_codes value exceeded 285\n");
 		exit(1);
 	}
 }
 
 struct BitStrShort encode_length(uint16_t value) {
 	if (value < 3) {
-		fprintf(stderr, "Value error: encode_length value less than 3");
+		fprintf(stderr, "Value error: encode_length value less than 3\n");
 		exit(1);
 	}
 	if (value > 258) {
-		fprintf(stderr, "Value error: encode_length value greater than 258");
+		fprintf(stderr, "Value error: encode_length value greater than 258\n");
 		exit(1);
 	}
 
@@ -73,7 +73,7 @@ struct BitStrShort encode_length(uint16_t value) {
 
 struct BitStrShort encode_offset(uint16_t value) {
 	if (value > 32768) {
-		fprintf(stderr, "Value error: encode_offset value greater than 32768");
+		fprintf(stderr, "Value error: encode_offset value greater than 32768\n");
 		exit(1);
 	}
 	uint16_t code = 0;

src/main/c/jasc-pal-thumbnailer.c

@@ -72,7 +72,7 @@ void parse_input(struct Palette *const retval, const char *const filename) {
 	if (filename) {
 		f = fopen(filename, "rb");
 		if (!f) {
-			fprintf(stderr, "Could not open file %s", filename);
+			fprintf(stderr, "Could not open file %s\n", filename);
 			exit(1);
 		}
 	} else {
@@ -151,7 +151,7 @@ void write_output(const struct Palette *const palette, const char *const filenam
 	if (filename) {
 		f = fopen(filename, "wb");
 		if (!f) {
-			fprintf(stderr, "Could not open file %s", filename);
+			fprintf(stderr, "Could not open file %s\n", filename);
 			exit(1);
 		}
 	} else {