+
−/*
+
− * This helper program generates the set of *.cfg header files, based on a
+
− * template file and environment variables for the non-constant settings.
+
− */
+
−
+
−#include <stdio.h>
+
−#include <stdlib.h>
+
−#include <unistd.h>
+
−#include <ctype.h>
+
−#include <string.h>
+
−#include <strings.h>
+
−
+
−char *infname;
+
−FILE *inf, *outf;
+
−char include_guard_symbol[32];
+
−char linebuf[256];
+
−int lineno;
+
−
+
−make_include_guard_symbol(fname)
+
−	char *fname;
+
−{
+
−	char *sp, *dp;
+
−	int c;
+
−
+
−	sp = fname;
+
−	dp = include_guard_symbol;
+
−	*dp++ = '_';
+
−	*dp++ = '_';
+
−	while (c = *sp++) {
+
−		if (islower(c))
+
−			c = toupper(c);
+
−		else if (c == '.')
+
−			c = '_';
+
−		*dp++ = c;
+
−	}
+
−	*dp++ = '_';
+
−	*dp++ = '_';
+
−	*dp = '\0';
+
−}
+
−
+
−close_output()
+
−{
+
−	if (outf) {
+
−		fprintf(outf, "#endif /* %s */\n", include_guard_symbol);
+
−		fclose(outf);
+
−		outf = 0;
+
−	}
+
−}
+
−
+
−bracket_line()
+
−{
+
−	char *cp;
+
−
+
−	close_output();
+
−	cp = index(linebuf+1, ']');
+
−	if (!cp) {
+
−		fprintf(stderr, "%s line %d: unterminated bracket line\n",
+
−			infname, lineno);
+
−		exit(1);
+
−	}
+
−	*cp = '\0';
+
−	outf = fopen(linebuf+1, "w");
+
−	if (!outf) {
+
−		perror(linebuf+1);
+
−		exit(1);
+
−	}
+
−	make_include_guard_symbol(linebuf+1);
+
−	fprintf(outf, "#ifndef %s\n", include_guard_symbol);
+
−	fprintf(outf, "#define %s\n", include_guard_symbol);
+
−}
+
−
+
−process_line()
+
−{
+
−	char *cp, *symbol, *value;
+
−
+
−	if (linebuf[0] == '[')
+
−		return bracket_line();
+
−	for (cp = linebuf; isspace(*cp); cp++)
+
−		;
+
−	if (*cp == '\0' || *cp == '#')
+
−		return;
+
−	for (symbol = cp; *cp && !isspace(*cp); cp++)
+
−		;
+
−	if (!*cp) {
+
−inv:		fprintf(stderr, "%s line %d: expected two fields\n",
+
−			infname, lineno);
+
−		exit(1);
+
−	}
+
−	*cp++ = '\0';
+
−	while (isspace(*cp))
+
−		cp++;
+
−	if (*cp == '\0' || *cp == '#')
+
−		goto inv;
+
−	for (value = cp; *cp && !isspace(*cp); cp++)
+
−		;
+
−	if (*cp)
+
−		*cp++ = '\0';
+
−	while (isspace(*cp))
+
−		cp++;
+
−	if (*cp != '\0' && *cp != '#')
+
−		goto inv;
+
−	if (!strcmp(value, "var")) {
+
−		value = getenv(symbol);
+
−		if (!value) {
+
−			fprintf(stderr,
+
−			"%s line %d: no environment variable named %s\n",
+
−				infname, lineno, symbol);
+
−			exit(1);
+
−		}
+
−	}
+
−	if (!outf) {
+
−		fprintf(stderr, "%s line %d: no open output file\n",
+
−			infname, lineno);
+
−		exit(1);
+
−	}
+
−	fprintf(outf, "#define %s %s\n", symbol, value);
+
−}
+
−
+
−main(argc, argv)
+
−	char **argv;
+
−{
+
−	if (argc != 3) {
+
−		fprintf(stderr, "usage: %s template-file output-dir\n",
+
−			argv[0]);
+
−		exit(1);
+
−	}
+
−	infname = argv[1];
+
−	inf = fopen(infname, "r");
+
−	if (!inf) {
+
−		perror(infname);
+
−		exit(1);
+
−	}
+
−	if (chdir(argv[2]) < 0) {
+
−		perror(argv[2]);
+
−		exit(1);
+
−	}
+
−	for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++)
+
−		process_line();
+
−	close_output();
+
−	exit(0);
+
−}