/* $OpenBSD: crunchgen.c,v 1.24 2006/02/06 16:49:31 jmc Exp $	 */

/*
 * Copyright (c) 1994 University of Maryland
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of U.M. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  U.M. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author: James da Silva, Systems Design and Analysis Group
 *			   Computer Science Department
 *			   University of Maryland at College Park
 */
/*
 * ========================================================================
 * crunchgen.c
 *
 * Generates a Makefile and main C file for a crunched executable,
 * from specs given in a .conf file.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>

#define CRUNCH_VERSION	"0.3"

#define MAXLINELEN	16384
#define MAXFIELDS 	 2048

/* XXX - This should be runtime configurable */
/*
 * We might have more than one makefile
 * name on any given platform. Make sure
 * default name is last though.
 */
char           *mf_name[] = {
#if defined(MF_NAMES)
	MF_NAMES,
#else
	"Makefile",
#endif
	NULL
};

/* internal representation of conf file: */

/* simple lists of strings suffice for most parms */

typedef struct strlst {
	struct strlst  *next;
	char           *str;
} strlst_t;

/* progs have structure, each field can be set with "special" or calculated */

typedef struct prog {
	struct prog    *next;
	char           *name, *ident, *mf_name;
	char           *srcdir, *objdir;
	strlst_t       *objs, *objpaths;
	strlst_t       *links;
	int             goterror;
} prog_t;

strlst_t       *srcdirs = NULL;
strlst_t       *libs = NULL;
strlst_t       *libdirs = NULL;
prog_t         *progs = NULL;

char            line[MAXLINELEN];

char            confname[MAXPATHLEN], infilename[MAXPATHLEN];
char            outmkname[MAXPATHLEN], outcfname[MAXPATHLEN];
char            cachename[MAXPATHLEN], curfilename[MAXPATHLEN];
char            topdir[MAXPATHLEN], execfname[MAXPATHLEN];
int             linenum = -1;
int             goterror = 0;

char           *progname = "crunchgen";

int             verbose, readcache, elf_names;	/* options */
int             reading_cache;

void            status(char *str);
void            out_of_memory(void);
void            add_string(strlst_t ** listp, char *str);
int             is_dir(char *pathname);
int             is_nonempty_file(char *pathname);
void            usage(void);
void            parse_conf_file(void);
void            gen_outputs(void);

int 
main(int argc, char *argv[])
{
	char           *p;
	int             optc;
	extern int      optind;
	extern char    *optarg;

	verbose = 1;
	readcache = 1;
	*outmkname = *outcfname = *execfname = '\0';

	if (argc > 0)
		progname = argv[0];

	while ((optc = getopt(argc, argv, "m:c:e:fqD:EL:")) != -1) {
		switch (optc) {
		case 'f':
			readcache = 0;
			break;
		case 'q':
			verbose = 0;
			break;

		case 'm':
			if (strlcpy(outmkname, optarg, sizeof(outmkname)) >=
			    sizeof(outmkname))
				usage();
			break;
		case 'c':
			if (strlcpy(outcfname, optarg, sizeof(outcfname)) >=
			    sizeof(outcfname))
				usage();
			break;
		case 'e':
			if (strlcpy(execfname, optarg, sizeof(execfname)) >=
			    sizeof(execfname))
				usage();
			break;

		case 'D':
			if (strlcpy(topdir, optarg, sizeof(topdir)) >= sizeof(topdir))
				usage();
			break;
		case 'E':
			elf_names = 1;
			break;
		case 'L':
			if (strlen(optarg) >= MAXPATHLEN)
				usage();
			add_string(&libdirs, optarg);
			break;
		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	if (argc != 1)
		usage();

	if (libdirs == NULL)
		add_string(&libdirs, "/usr/lib");
	/*
         * generate filenames
         */

	if (strlcpy(infilename, argv[0], sizeof(infilename)) >=
	    sizeof(infilename))
		usage();

	/* confname = `basename infilename .conf` */

	if ((p = strrchr(infilename, '/')) != NULL)
		strlcpy(confname, p + 1, sizeof confname);
	else
		strlcpy(confname, infilename, sizeof confname);
	if ((p = strrchr(confname, '.')) != NULL && !strcmp(p, ".conf"))
		*p = '\0';

	if (!*outmkname)
		snprintf(outmkname, sizeof(outmkname), "%s.mk", confname);
	if (!*outcfname)
		snprintf(outcfname, sizeof(outcfname), "%s.c", confname);
	if (!*execfname)
		snprintf(execfname, sizeof(execfname), "%s", confname);
	snprintf(cachename, sizeof(cachename), "%s.cache", confname);

	parse_conf_file();
	gen_outputs();

	exit(goterror);
}

void 
usage(void)
{
	fprintf(stderr, "%s [-Efq] [-c c-file-name] [-D src-root] [-e exec-file-name]\n"
	    "\t[-L lib-dir] [-m makefile-name] conf-file\n",
	    progname);
	exit(1);
}

void            parse_one_file(char *filename);
void            parse_line(char *line, int *fc, char **fv, int nf);
void            add_srcdirs(int argc, char **argv);
void            add_progs(int argc, char **argv);
void            add_link(int argc, char **argv);
void            add_libs(int argc, char **argv);
void            add_libdirs(int argc, char **argv);
void            add_special(int argc, char **argv);

prog_t         *find_prog(char *str);
void            add_prog(char *progname);

void 
parse_conf_file(void)
{
	if (!is_nonempty_file(infilename)) {
		fprintf(stderr, "%s: fatal: input file \"%s\" not found.\n",
		    progname, infilename);
		exit(1);
	}
	parse_one_file(infilename);
	if (readcache && is_nonempty_file(cachename)) {
		reading_cache = 1;
		parse_one_file(cachename);
	}
}

void 
parse_one_file(char *filename)
{
	char           *fieldv[MAXFIELDS];
	int             fieldc;
	void            (*f) (int c, char **v);
	FILE           *cf;

	snprintf(line, sizeof(line), "reading %s", filename);
	status(line);
	strlcpy(curfilename, filename, sizeof curfilename);

	if ((cf = fopen(curfilename, "r")) == NULL) {
		perror(curfilename);
		goterror = 1;
		return;
	}
	linenum = 0;
	while (fgets(line, MAXLINELEN, cf) != NULL) {
		linenum++;
		parse_line(line, &fieldc, fieldv, MAXFIELDS);
		if (fieldc < 1)
			continue;
		if (!strcmp(fieldv[0], "srcdirs"))
			f = add_srcdirs;
		else if (!strcmp(fieldv[0], "progs"))
			f = add_progs;
		else if (!strcmp(fieldv[0], "ln"))
			f = add_link;
		else if (!strcmp(fieldv[0], "libs"))
			f = add_libs;
		else if (!strcmp(fieldv[0], "special"))
			f = add_special;
		else if (!strcmp(fieldv[0], "libdirs"))
			f = add_libdirs;
		else {
			fprintf(stderr, "%s:%d: skipping unknown command `%s'.\n",
			    curfilename, linenum, fieldv[0]);
			goterror = 1;
			continue;
		}
		if (fieldc < 2) {
			fprintf(stderr,
			    "%s:%d: %s command needs at least 1 "
		  	    "argument, skipping.\n",
			    curfilename, linenum, fieldv[0]);
			goterror = 1;
			continue;
		}
		f(fieldc, fieldv);
	}

	if (ferror(cf)) {
		perror(curfilename);
		goterror = 1;
	}
	fclose(cf);
}

void 
parse_line(char *line, int *fc, char **fv, int nf)
{
	char           *p;

	p = line;
	*fc = 0;
	while (1) {
		while (isspace(*p))
			p++;
		if (*p == '\0' || *p == '#')
			break;

		if (*fc < nf)
			fv[(*fc)++] = p;
		while (*p && !isspace(*p) && *p != '#')
			p++;
		if (*p == '\0' || *p == '#')
			break;
		*p++ = '\0';
	}
	if (*p)
		*p = '\0';	/* needed for '#' case */
}

void 
add_srcdirs(int argc, char **argv)
{
	int             i;
	char            tmppath[MAXPATHLEN];
	int             overflow;

	for (i = 1; i < argc; i++) {
		overflow = 0;
		if (argv[i][0] == '/' || topdir[0] == '\0') {
			if (strlcpy(tmppath, argv[i], sizeof(tmppath)) >=
			    sizeof(tmppath))
				overflow = 1;
		} else {
			if (strlcpy(tmppath, topdir, sizeof(tmppath)) >=
			    sizeof(tmppath) ||
			    strlcat(tmppath, "/", sizeof(tmppath)) >=
			    sizeof(tmppath) ||
			    strlcat(tmppath, argv[i], sizeof(tmppath)) >=
			    sizeof(tmppath))
				overflow = 1;
		}
		if (overflow) {
			goterror = 1;
			fprintf(stderr, "%s:%d: `%.40s...' is too long, skipping it.\n",
			    curfilename, linenum, argv[i]);
			continue;
		}
		if (is_dir(tmppath))
			add_string(&srcdirs, tmppath);
		else {
			fprintf(stderr, "%s:%d: `%s' is not a directory, skipping it.\n",
			    curfilename, linenum, tmppath);
			goterror = 1;
		}
	}
}

void 
add_libdirs(int argc, char **argv)
{
	int             i;
	char            tmppath[MAXPATHLEN];
	char            tmppath2[MAXPATHLEN];
	int             overflow;

	for (i = 1; i < argc; i++) {
		overflow = 0;
		if (argv[i][0] == '/' || topdir[0] == '\0') {
			if (strlcpy(tmppath, argv[i], sizeof(tmppath)) >=
			    sizeof(tmppath))
				overflow = 1;
		} else {
			if (strlcpy(tmppath, topdir, sizeof(tmppath)) >=
			    sizeof(tmppath) ||
			    strlcat(tmppath, "/", sizeof(tmppath)) >=
			    sizeof(tmppath) ||
			    strlcat(tmppath, argv[i], sizeof(tmppath)) >=
			    sizeof(tmppath))
				overflow = 1;
		}
		if (overflow) {
			goterror = 1;
			fprintf(stderr, "%s:%d: `%.40s...' is too long, skipping it.\n",
			    curfilename, linenum, argv[i]);
			continue;
		}
		if (is_dir(tmppath)) {
			snprintf(tmppath2, sizeof(tmppath2), "%s/obj", tmppath);
			if (is_dir(tmppath2))
				add_string(&libdirs, tmppath2);
			else {
				snprintf(tmppath2, sizeof(tmppath2), 
				    "%s/obj.%s", tmppath, MACHINE);
				if (is_dir(tmppath2))
					add_string(&libdirs, tmppath2);
				else
					add_string(&libdirs, tmppath);
			}
		}
		else {
			fprintf(stderr, "%s:%d: `%s' is not a directory, skipping it.\n",
			    curfilename, linenum, tmppath);
			goterror = 1;
		}
	}
}


void 
add_progs(int argc, char **argv)
{
	int             i;

	for (i = 1; i < argc; i++)
		add_prog(argv[i]);
}

void 
add_prog(char *progname)
{
	prog_t         *p1, *p2;

	/* add to end, but be smart about dups */

	for (p1 = NULL, p2 = progs; p2 != NULL; p1 = p2, p2 = p2->next)
		if (!strcmp(p2->name, progname))
			return;

	p2 = calloc(1, sizeof(prog_t));
	if (p2)
		p2->name = strdup(progname);
	if (!p2 || !p2->name)
		out_of_memory();

	p2->next = NULL;
	if (p1 == NULL)
		progs = p2;
	else
		p1->next = p2;

	p2->ident = p2->srcdir = p2->objdir = NULL;
	p2->links = p2->objs = NULL;
	p2->goterror = 0;
}

void 
add_link(int argc, char **argv)
{
	int             i;
	prog_t         *p = find_prog(argv[1]);

	if (p == NULL) {
		fprintf(stderr,
		    "%s:%d: no prog %s previously declared, skipping link.\n",
		    curfilename, linenum, argv[1]);
		goterror = 1;
		return;
	}
	for (i = 2; i < argc; i++)
		add_string(&p->links, argv[i]);
}

void 
add_libs(int argc, char **argv)
{
	int             i;

	for (i = 1; i < argc; i++)
		add_string(&libs, argv[i]);
}

void 
add_special(int argc, char **argv)
{
	int             i;
	prog_t         *p = find_prog(argv[1]);

	if (p == NULL) {
		if (reading_cache)
			return;
		fprintf(stderr,
		    "%s:%d: no prog %s previously declared, skipping special.\n",
		    curfilename, linenum, argv[1]);
		goterror = 1;
		return;
	}
	if (!strcmp(argv[2], "ident")) {
		if (argc != 4)
			goto argcount;
		if ((p->ident = strdup(argv[3])) == NULL)
			out_of_memory();
	} else if (!strcmp(argv[2], "srcdir")) {
		if (argc != 4)
			goto argcount;
		if ((p->srcdir = strdup(argv[3])) == NULL)
			out_of_memory();
	} else if (!strcmp(argv[2], "mf_name")) {
		if (argc != 4)
			goto argcount;
		if ((p->mf_name = strdup(argv[3])) == NULL)
			out_of_memory();
	} else if (!strcmp(argv[2], "objdir")) {
		if (argc != 4)
			goto argcount;
		if ((p->objdir = strdup(argv[3])) == NULL)
			out_of_memory();
	} else if (!strcmp(argv[2], "objs")) {
		p->objs = NULL;
		for (i = 3; i < argc; i++)
			add_string(&p->objs, argv[i]);
	} else if (!strcmp(argv[2], "objpaths")) {
		p->objpaths = NULL;
		for (i = 3; i < argc; i++)
			add_string(&p->objpaths, argv[i]);
	} else {
		fprintf(stderr, "%s:%d: bad parameter name `%s', skipping line.\n",
		    curfilename, linenum, argv[2]);
		goterror = 1;
	}
	return;

argcount:
	fprintf(stderr,
	    "%s:%d: too %s arguments, expected \"special %s %s <string>\".\n",
	    curfilename, linenum, argc < 4 ? "few" : "many", argv[1], argv[2]);
	goterror = 1;
}

prog_t  *
find_prog(char *str)
{
	prog_t         *p;

	for (p = progs; p != NULL; p = p->next)
		if (!strcmp(p->name, str))
			return p;
	return NULL;
}

void            remove_error_progs(void);
void            fillin_program(prog_t * p);
void            gen_specials_cache(void);
void            gen_output_makefile(void);
void            gen_output_cfile(void);

void            fillin_program_objs(prog_t * p, char *path);
void            top_makefile_rules(FILE * outmk);
void            prog_makefile_rules(FILE * outmk, prog_t * p);
void            output_strlst(FILE * outf, strlst_t * lst);
char           *genident(char *str);
char           *dir_search(char *progname);

void 
gen_outputs(void)
{
	prog_t         *p;

	for (p = progs; p != NULL; p = p->next)
		fillin_program(p);

	remove_error_progs();
	gen_specials_cache();
	gen_output_cfile();
	gen_output_makefile();
	status("");
	fprintf(stderr,
	    "Run \"make -f %s objs exe\" to build crunched binary.\n",
	    outmkname);
}

void 
fillin_program(prog_t * p)
{
	char            path[MAXPATHLEN];
	char           *srcparent;
	strlst_t       *s;
	int             i;

	snprintf(line, sizeof(line), "filling in parms for %s", p->name);
	status(line);

	if (!p->ident)
		p->ident = genident(p->name);
	if (!p->srcdir) {
		srcparent = dir_search(p->name);
		if (srcparent)
			snprintf(path, sizeof(path), "%s/%s", srcparent, p->name);
		if (is_dir(path))
			p->srcdir = strdup(path);
	}
	if (!p->objdir && p->srcdir) {
		snprintf(path, sizeof(path), "%s/obj", p->srcdir);
		if (is_dir(path))
			p->objdir = strdup(path);
		else {
			snprintf(path, sizeof(path), "%s/obj.%s", p->srcdir, MACHINE);
			if (is_dir(path))
				p->objdir = strdup(path);
			else
				p->objdir = p->srcdir;
		}
	}
	/* We have a sourcedir and no explicit objs, try */
	/* to find makefile and get objs from it. */
	if (p->srcdir && !p->objs) {
		for (i = 0; mf_name[i] != NULL; i++) {
			snprintf(path, sizeof(path), "%s/%s", p->srcdir, mf_name[i]);
			if (is_nonempty_file(path)) {
				p->mf_name = mf_name[i];
				fillin_program_objs(p, path);
				break;
			}
		}
	}
	if (!p->objpaths && p->objdir && p->objs)
		for (s = p->objs; s != NULL; s = s->next) {
			snprintf(line, sizeof(line), "%s/%s", p->objdir, s->str);
			add_string(&p->objpaths, line);
		}

	if (!p->srcdir && verbose)
		fprintf(stderr, "%s: %s: warning: could not find source directory.\n",
		    infilename, p->name);
	if (!p->objs && verbose)
		fprintf(stderr, "%s: %s: warning: could not find any .o files.\n",
		    infilename, p->name);

	if (!p->objpaths) {
		fprintf(stderr,
		    "%s: %s: error: no objpaths specified or calculated.\n",
		    infilename, p->name);
		p->goterror = goterror = 1;
	}
}

void 
fillin_program_objs(prog_t * p, char *path)
{
	char           *cp, *obj, tempfname[MAXPATHLEN];
	int             fd, rc;
	FILE           *f;

	/* discover the objs from the srcdir Makefile */

	snprintf(tempfname, sizeof(tempfname), ".tmp_%sXXXXXXXXXX", confname);
	if ((fd = mkstemp(tempfname)) == -1 || (f = fdopen(fd, "w")) == NULL) {
		if (fd != -1)
			close(fd);
		perror(tempfname);
		goterror = 1;
		return;
	}
	fprintf(f, ".include \"%s\"\n", path);
	fprintf(f, ".if defined(PROG) && !defined(OBJS)\n");
	fprintf(f, "OBJS=${PROG}.o\n");
	fprintf(f, ".endif\n");
	fprintf(f, "crunchgen_objs:\n\t@echo 'OBJS= '${OBJS}\n");
	fclose(f);

	snprintf(line, sizeof(line), "make -f %s crunchgen_objs 2>&1", tempfname);
	if ((f = popen(line, "r")) == NULL) {
		perror("submake pipe");
		goterror = 1;
		return;
	}
	while (fgets(line, MAXLINELEN, f)) {
		if (strncmp(line, "OBJS= ", 6)) {
			if (strcmp(line,
			    "sh: warning: running as root with dot in PATH\n") == 0)
				continue;
			fprintf(stderr, "make error: %s", line);
			goterror = 1;
			continue;
		}
		cp = line + 6;
		while (isspace(*cp))
			cp++;
		while (*cp) {
			obj = cp;
			while (*cp && !isspace(*cp))
				cp++;
			if (*cp)
				*cp++ = '\0';
			add_string(&p->objs, obj);
			while (isspace(*cp))
				cp++;
		}
	}
	if ((rc = pclose(f)) != 0) {
		fprintf(stderr, "make error: make returned %d\n", rc);
		goterror = 1;
	}
	unlink(tempfname);
}

void 
remove_error_progs(void)
{
	prog_t         *p1, *p2;

	p1 = NULL;
	p2 = progs;
	while (p2 != NULL) {
		if (!p2->goterror)
			p1 = p2, p2 = p2->next;
		else {
			/* delete it from linked list */
			fprintf(stderr, "%s: %s: ignoring program because of errors.\n",
			    infilename, p2->name);
			if (p1)
				p1->next = p2->next;
			else
				progs = p2->next;
			p2 = p2->next;
		}
	}
}

void 
gen_specials_cache(void)
{
	FILE           *cachef;
	prog_t         *p;

	snprintf(line, sizeof(line), "generating %s", cachename);
	status(line);

	if ((cachef = fopen(cachename, "w")) == NULL) {
		perror(cachename);
		goterror = 1;
		return;
	}
	fprintf(cachef, "# %s - parm cache generated from %s by crunchgen %s\n\n",
	    cachename, infilename, CRUNCH_VERSION);

	for (p = progs; p != NULL; p = p->next) {
		fprintf(cachef, "\n");
		if (p->srcdir)
			fprintf(cachef, "special %s srcdir %s\n", p->name, p->srcdir);
		if (p->mf_name)
			fprintf(cachef, "special %s mf_name %s\n", p->name, p->mf_name);
		if (p->objdir)
			fprintf(cachef, "special %s objdir %s\n", p->name, p->objdir);
		if (p->objs) {
			fprintf(cachef, "special %s objs", p->name);
			output_strlst(cachef, p->objs);
		}
		fprintf(cachef, "special %s objpaths", p->name);
		output_strlst(cachef, p->objpaths);
	}
	fclose(cachef);
}

void 
gen_output_makefile(void)
{
	prog_t         *p;
	FILE           *outmk;

	snprintf(line, sizeof(line), "generating %s", outmkname);
	status(line);

	if ((outmk = fopen(outmkname, "w")) == NULL) {
		perror(outmkname);
		goterror = 1;
		return;
	}
	fprintf(outmk, "# %s - generated from %s by crunchgen %s\n\n",
	    outmkname, infilename, CRUNCH_VERSION);

	top_makefile_rules(outmk);

	for (p = progs; p != NULL; p = p->next)
		prog_makefile_rules(outmk, p);

	fprintf(outmk, "\n# ========\n");
	fclose(outmk);
}

void 
gen_output_cfile(void)
{
	extern char    *crunched_skel[];
	char          **cp;
	FILE           *outcf;
	prog_t         *p;
	strlst_t       *s;

	snprintf(line, sizeof(line), "generating %s", outcfname);
	status(line);

	if ((outcf = fopen(outcfname, "w")) == NULL) {
		perror(outcfname);
		goterror = 1;
		return;
	}
	fprintf(outcf, "/* %s - generated from %s by crunchgen %s */\n",
	    outcfname, infilename, CRUNCH_VERSION);

	fprintf(outcf, "#define EXECNAME \"%s\"\n", execfname);
	for (cp = crunched_skel; *cp != NULL; cp++)
		fprintf(outcf, "%s\n", *cp);

	for (p = progs; p != NULL; p = p->next)
		fprintf(outcf, "extern int _crunched_%s_stub();\n", p->ident);

	fprintf(outcf, "\nstruct stub entry_points[] = {\n");
	for (p = progs; p != NULL; p = p->next) {
		fprintf(outcf, "\t{ \"%s\", _crunched_%s_stub },\n",
			p->name, p->ident);
		for (s = p->links; s != NULL; s = s->next)
			fprintf(outcf, "\t{ \"%s\", _crunched_%s_stub },\n",
				s->str, p->ident);
	}

	fprintf(outcf, "\t{ EXECNAME, crunched_main },\n");
	fprintf(outcf, "\t{ NULL, NULL }\n};\n");
	fclose(outcf);
}

char           *
genident(char *str)
{
	char           *n, *s, *d;

	/*
         * generates a Makefile/C identifier from a program name, mapping '-' to
         * '_' and ignoring all other non-identifier characters.  This leads to
         * programs named "foo.bar" and "foobar" to map to the same identifier.
         */

	if ((n = strdup(str)) == NULL)
		return NULL;
	for (d = s = n; *s != '\0'; s++) {
		if (*s == '-')
			*d++ = '_';
		else if (*s == '_' || isalnum(*s))
			*d++ = *s;
	}
	*d = '\0';
	return n;
}

char           *
dir_search(char *progname)
{
	char            path[MAXPATHLEN];
	strlst_t       *dir;

	for (dir = srcdirs; dir != NULL; dir = dir->next) {
		snprintf(path, sizeof(path), "%s/%s", dir->str, progname);
		if (is_dir(path))
			return dir->str;
	}
	return NULL;
}

void 
top_makefile_rules(FILE * outmk)
{
	prog_t         *p;
	strlst_t       *l;


	fprintf(outmk, "STRIP=strip\n");
	fprintf(outmk, "LINK=$(LD) -dc -r\n");
	fprintf(outmk, "LIBS=");
	for (l = libdirs; l != NULL; l = l->next)
		fprintf(outmk, " -L%s", l->str);
	output_strlst(outmk, libs);

	fprintf(outmk, "CRUNCHED_OBJS=");
	for (p = progs; p != NULL; p = p->next)
		fprintf(outmk, " %s.lo", p->name);
	fprintf(outmk, "\n");

	fprintf(outmk, "SUBMAKE_TARGETS=");
	for (p = progs; p != NULL; p = p->next)
		fprintf(outmk, " %s_make", p->ident);
	fprintf(outmk, "\n\n");

	fprintf(outmk, "%s: %s.o $(CRUNCHED_OBJS)\n",
	    execfname, execfname);
	fprintf(outmk, "\t$(CC) -static -o $@ %s.o $(CRUNCHED_OBJS) $(LIBS)\n",
	    execfname);
	fprintf(outmk, "\t$(STRIP) %s\n", execfname);
	fprintf(outmk, "all: objs exe\nobjs: $(SUBMAKE_TARGETS)\n");
	fprintf(outmk, "exe: %s\n", execfname);
	fprintf(outmk, "clean:\n\trm -f %s *.lo *.o *_stub.c\n",
	    execfname);
	fprintf(outmk, ".PHONY: all objs exe clean $(SUBMAKE_TARGETS)\n\n");
}

void 
prog_makefile_rules(FILE * outmk, prog_t * p)
{
	fprintf(outmk, "\n# -------- %s\n\n", p->name);

	if (p->srcdir && p->objs) {
		fprintf(outmk, "%s_SRCDIR=%s\n", p->ident, p->srcdir);
		fprintf(outmk, "%s_OBJS=", p->ident);
		output_strlst(outmk, p->objs);
		fprintf(outmk, "%s_make:\n", p->ident);
		fprintf(outmk, "\tcd $(%s_SRCDIR) && exec $(MAKE) -f %s $(%s_OBJS)\n\n",
		    p->ident, p->mf_name, p->ident);
	} else
		fprintf(outmk, "%s_make:\n\t@echo \"** cannot make objs for %s\"\n\n",
		    p->ident, p->name);

	fprintf(outmk, "%s_OBJPATHS=", p->ident);
	output_strlst(outmk, p->objpaths);

	fprintf(outmk, "%s_stub.c:\n", p->name);
	fprintf(outmk, "\techo \""
	    "int _crunched_%s_stub(int argc, char **argv, char **envp)"
	    "{return main(argc,argv,envp);}\" >$@\n",
	    p->ident);
	fprintf(outmk, "%s.lo: %s_stub.o $(%s_OBJPATHS)\n",
	    p->name, p->name, p->ident);
	fprintf(outmk, "\t$(LINK) -o $@ %s_stub.o $(%s_OBJPATHS)\n",
	    p->name, p->ident);
	fprintf(outmk, "\tcrunchide -k %s_crunched_%s_stub $@\n",
	    elf_names ? "" : "_", p->ident);
}

void 
output_strlst(FILE * outf, strlst_t * lst)
{
	for (; lst != NULL; lst = lst->next)
		fprintf(outf, " %s", lst->str);
	fprintf(outf, "\n");
}

void 
status(char *str)
{
	static int      lastlen = 0;
	int             len, spaces;

	if (!verbose)
		return;

	len = strlen(str);
	spaces = lastlen - len;
	if (spaces < 1)
		spaces = 1;

	fprintf(stderr, " [%s]%*.*s\r", str, spaces, spaces, " ");
	fflush(stderr);
	lastlen = len;
}

void 
out_of_memory(void)
{
	fprintf(stderr, "%s: %d: out of memory, stopping.\n", infilename, linenum);
	exit(1);
}

void 
add_string(strlst_t ** listp, char *str)
{
	strlst_t       *p1, *p2;

	/* add to end, but be smart about dups */

	for (p1 = NULL, p2 = *listp; p2 != NULL; p1 = p2, p2 = p2->next)
		if (!strcmp(p2->str, str))
			return;

	p2 = calloc(1, sizeof(strlst_t));
	if (p2)
		p2->str = strdup(str);
	if (!p2 || !p2->str)
		out_of_memory();

	p2->next = NULL;
	if (p1 == NULL)
		*listp = p2;
	else
		p1->next = p2;
}

int 
is_dir(char *pathname)
{
	struct stat     buf;

	if (stat(pathname, &buf) == -1)
		return 0;
	return S_ISDIR(buf.st_mode);
}

int 
is_nonempty_file(char *pathname)
{
	struct stat     buf;

	if (stat(pathname, &buf) == -1)
		return 0;

	return S_ISREG(buf.st_mode) && buf.st_size > 0;
}