tests: Improve on testing fexc

After all .fex files can be successfully compiled, let's also
test the opposite direction by decompiling the resulting .bin.
The output then has to pass an automated diff against the source
.fex (transformed via some preprocessing with "unify-fex").
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

tests/Makefile

@@ -7,7 +7,7 @@ BOARDS_DIR := sunxi-boards
 
 check: check_all_fex
 
-check_all_fex: $(BOARDS_DIR)/README
+check_all_fex: $(BOARDS_DIR)/README unify-fex
 	./test_all_fex.sh $(BOARDS_DIR)
 
 # Retrieve and extract sunxi-boards archive (containing all .fex)
@@ -20,5 +20,8 @@ $(BOARDS_DIR)/README: $(BOARDS_DIR).zip
 	touch -r $(BOARDS_DIR) $<
 	cat patches/*.patch | patch -p1
 
+unify-fex: unify-fex.c
+	$(CC) -Wall -Werror -o $@ $<
+
 clean:
-	rm -rf $(BOARDS_DIR).zip $(BOARDS_DIR)
+	rm -rf $(BOARDS_DIR).zip $(BOARDS_DIR) unify-fex

tests/fextest.sh

@@ -6,3 +6,14 @@ FEX=$1
 BIN=${FEX/%.fex/.bin}
 REVERSE=${FEX/%.fex/.new}
 ${FEX2BIN} ${FEX} ${BIN}
+${BIN2FEX} ${BIN} ${REVERSE}
+# preprocess .fex, compare it to the bin2fex output
+if ./unify-fex ${FEX} | diff -uwB - ${REVERSE}; then
+	# if successful, clean up the output files
+	rm -f ${BIN} ${REVERSE}
+else
+	echo '***'
+	echo "*** ERROR processing ${FEX}"
+	echo '***'
+	exit 1
+fi

tests/unify-fex.c

+/*
+ * Copyright (C) 2016  Bernhard Nortmann <bernhard.nortmann@web.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * unify-fex.c
+ *
+ * A utility program to do some standard transformations on .fex files,
+ * to allow simpler (diff) comparison with the output of bin2fex.
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* string macro to determine if str starts with a given literal */
+#define starts(str, literal) \
+	(strncmp(str, "" literal, sizeof(literal) - 1) == 0)
+
+int main(int argc, char **argv)
+{
+	FILE *input = stdin;
+	char line[1024];
+	char *c, *p;
+	long long num;
+
+	if (argc >= 2) {
+		input = fopen(argv[1], "r");
+		if (!input) {
+			perror("failed to open input file");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	/* loop over all input lines, output goes to stdout */
+	while (fgets(line, sizeof(line), input)) {
+
+		/* strip all whitespace (even CR/LF) from the input line */
+		for (c = p = line; *p; p++) {
+			if (!isspace(*p))
+				*c++ = *p;
+		}
+		*c = '\0';
+
+		if (*line == ';' || *line == '#')
+			/* This is a comment line, simply ignore it */
+			continue;
+		if (*line == ':')
+			continue; /* suspect malformed comment, ignore */
+
+		if ((p = strchr(line, '='))) {
+			/* This is a <key> = <value> line, reformat it */
+			c = strdup(p + 1);
+			sprintf(p, " = %s", c);
+			free(c);
+			p += 3; /* have p point to the beginning of <value> */
+
+			if (starts(p, "port:")) {
+				if (p[5] == 'P') { /* port:P... */
+					/* get pin number (including bank) */
+					num = ((p[6] - 'A') << 5) + strtoll(p + 7, &c, 10);
+					c = strdup(c);
+					sprintf(p, "port:P%c%02lld%s", 'A' + (int)(num >> 5), (num & 0x1F), c);
+					free(c);
+
+					/* check angle brackets to determine options count */
+					num = 0;
+					for (c = p + 9; *c; c++) {
+						if (*c == '<')
+							num++;
+					}
+					/* append "<default>" for missing options */
+					c = strrchr(p, '\0');
+					while (num < 4) {
+						c += sprintf(c, "<default>");
+						num++;
+					}
+				}
+			} else {
+				/*
+				 * fix formatting of numeric values, depending on the keyword
+				 * these are a bit nasty, since they vary wildly between hex
+				 * and decimal - see decompile_single_mode() in script_fex.c
+				 */
+				num = strtoll(p, NULL, 0);
+				if (num || *p == '0') {
+					int hex = starts(line, "csi_twi_addr");
+					hex |= starts(line, "ctp_twi_addr");
+					hex |= starts(line, "dram_baseaddr");
+					hex |= starts(line, "dram_emr");
+					hex |= starts(line, "dram_tpr");
+					hex |= starts(line, "dram_zq");
+					hex |= starts(line, "g2d_size");
+					hex |= starts(line, "gsensor_twi_addr");
+					hex |= starts(line, "lcd_gamma_tbl_");
+					hex |= starts(line, "rtp_press_threshold ");
+					hex |= starts(line, "rtp_sensitive_level");
+					hex |= starts(line, "tkey_twi_addr");
+
+					/* large decimals will be decompiled as negative */
+					if (!hex && num >= 2147483648LL)
+						num -= 4294967296LL;
+
+					sprintf(p, hex ? "0x%llx" : "%lld", num);
+				} else {
+					/*
+					 * We expect all other (= non-numeric) values
+					 * to be strings, always quote them.
+					 */
+					if (*p && (*p != '"')) {
+						c = strdup(p);
+						sprintf(p, "\"%s\"", c);
+						free(c);
+					}
+				}
+			}
+		}
+
+		puts(line);
+	}
+
+	if (ferror(input)) {
+		perror("file read error");
+		exit(EXIT_FAILURE);
+	}
+
+	fclose(input);
+	return EXIT_SUCCESS;
+}