From f624e289c5d4465d09219305f907f1f39ca23f5e Mon Sep 17 00:00:00 2001
From: startx2017 <vradu.startx@yandex.com>
Date: Tue, 1 Sep 2020 13:16:24 -0400
Subject: preprocessor for man pages

---
 src/man/Makefile.in |  17 ++++++
 src/man/preproc.c   | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 163 insertions(+)
 create mode 100644 src/man/Makefile.in
 create mode 100644 src/man/preproc.c

(limited to 'src/man')

diff --git a/src/man/Makefile.in b/src/man/Makefile.in
new file mode 100644
index 000000000..0180baee5
--- /dev/null
+++ b/src/man/Makefile.in
@@ -0,0 +1,17 @@
+all: firecfg.man firejail.man firejail-login.man firejail-users.man firejail-profile.man firemon.man
+
+include ../common.mk
+
+%.o : %.c $(H_FILE_LIST)
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(INCLUDE) -c $< -o $@
+
+preproc: $(OBJS)
+	$(CC)  $(LDFLAGS) -o $@ $(OBJS) $(LIBS) $(EXTRA_LDFLAGS)
+
+%.man: %.txt preproc
+	./preproc $(MANFLAGS) $<
+
+clean:; rm -fr *.o preproc *.gcov *.gcda *.gcno *.plist *.man alldone
+
+distclean: clean
+	rm -fr Makefile
diff --git a/src/man/preproc.c b/src/man/preproc.c
new file mode 100644
index 000000000..34a49d335
--- /dev/null
+++ b/src/man/preproc.c
@@ -0,0 +1,146 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define MAXBUF 4096
+#define MAXMACROS 64
+static char *macro[MAXMACROS] = {NULL};
+
+static void add_macro(char *m) {
+	assert(m);
+	int i;
+	for (i = 0; i < MAXMACROS && macro[i]; i++);
+	if (i == MAXMACROS) {
+		fprintf(stderr, "Error: maximum number of marcros (%d) exceeded\n", MAXMACROS);
+		exit(1);
+	}
+
+	macro[i] = m;
+}
+
+static char *find_macro(char *m) {
+	assert(m);
+	int i = 0;
+	while (i < MAXMACROS && macro[i]) {
+		if (strcmp(macro[i], m) == 0)
+			return m;
+		i++;
+	}
+
+	return NULL;
+}
+
+static void usage(void) {
+	printf("Simple preprocessor for man pages. It supports:\n");
+	printf("\t#if 0 ... #endif\n");
+	printf("\t#ifdef macro ... #endif\n");
+	printf("Usage: preproc [--help] [-Dmacro] manpage.txt\n");
+	return;
+}
+
+
+int main(int argc, char **argv) {
+	if (argc == 1) {
+		fprintf(stderr, "Error: no files/arguments provided\n");
+		usage();
+		exit(1);
+	}
+
+	int i;
+	for (i = 1; i < argc; i++) {
+		if (strncmp(argv[i], "-D", 2) == 0)
+			add_macro(argv[i] + 2);
+		else if (strcmp(argv[i], "--help") == 0) {
+			usage();
+			return 0;
+		}
+		else if (*argv[i] == '-') {
+			fprintf(stderr, "Error: invalid argument %s\n", argv[i]);
+			exit(1);
+		}
+		else
+			break;
+	}
+
+	char *ptr = strstr(argv[i], ".txt");
+	if (!ptr || strlen(ptr) != 4) {
+		fprintf(stderr, "Error: input file needs to have a .txt extension\n"),
+		exit(1);
+	}
+
+	FILE *fp = fopen(argv[i], "r");
+	if (!fp) {
+		fprintf(stderr, "Error: cannot open %s\n", argv[i]);
+		exit(1);
+	}
+	char *outfile = strdup(argv[i]);
+	if (!outfile)
+		goto errout;
+	ptr = strstr(outfile, ".txt");
+	assert(ptr);
+	strcpy(ptr, ".man");
+	FILE *fpout = fopen(outfile, "w");
+	if (!fpout)
+		goto errout;
+
+	char buf[MAXBUF];
+	int disabled = 0;
+	int enabled = 0;
+	int line = 0;;
+	while (fgets(buf, MAXBUF, fp)) {
+		line++;
+		if (disabled && strncmp(buf, "#if", 3) == 0) {
+			fprintf(stderr, "Error %d: already in a #if block on line %d\n", __LINE__, line);
+			exit(1);
+		}
+		if ((!disabled && !enabled) && strncmp(buf, "#endif", 6) == 0) {
+			fprintf(stderr, "Error %d: unmatched #endif on line %d\n", __LINE__, line);
+			exit(1);
+		}
+
+		char *ptr = strchr(buf, '\n');
+		if (ptr)
+			*ptr = '\0';
+
+		if (strncmp(buf, "#if 0", 5) == 0) {
+			disabled = 1;
+			continue;
+		}
+		if (strncmp(buf, "#ifdef", 6) == 0) {
+			char *ptr = buf + 6;
+			if (*ptr != ' ' && *ptr != '\t') {
+				fprintf(stderr, "Error %d: invalid macro on line %d\n", __LINE__, line);
+				exit(1);
+			}
+
+			while (*ptr == ' ' || *ptr == '\t')
+				ptr++;
+
+			if (!find_macro(ptr))
+				disabled = 1;
+			else
+				enabled = 1;
+			continue;
+		}
+
+		if (strncmp(buf, "#endif", 6) == 0) {
+			disabled = 0;
+			enabled = 1;
+			continue;
+		}
+
+		if (!disabled) {
+//			printf("%s\n", buf);
+			fprintf(fpout, "%s\n", buf);
+		}
+	}
+	fclose(fp);
+
+	return 0;
+
+errout:
+	fclose(fp);
+	fprintf(stderr, "Error: cannot open output file\n");
+	exit(1);
+}
-- 
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