X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=tools%2Fdepends.c;h=ee39a12f134e4405c98f45f10cefe9fff829752a;hp=1360cc3931de3767415fa7c6021ec2b8935abc1f;hb=fee8416f9d5c23f05d0c4fc57cfb56aaf91c0769;hpb=b0f7eb297643941bd96eb209f35fbe223cd24e10

diff --git a/tools/depends.c b/tools/depends.c
index 1360cc39..ee39a12f 100644
--- a/tools/depends.c
+++ b/tools/depends.c
@@ -2,14 +2,18 @@
 #include <ccan/str/str.h>
 #include <ccan/grab_file/grab_file.h>
 #include <ccan/str_talloc/str_talloc.h>
+#include <ccan/read_write_all/read_write_all.h>
 #include "tools.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <err.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <errno.h>
 
-static char ** __attribute__((format(printf, 3, 4)))
-lines_from_cmd(const void *ctx, unsigned int *num, char *format, ...)
+static char ** __attribute__((format(printf, 2, 3)))
+lines_from_cmd(const void *ctx, char *format, ...)
 {
 	va_list ap;
 	char *cmd, *buffer;
@@ -28,42 +32,59 @@ lines_from_cmd(const void *ctx, unsigned int *num, char *format, ...)
 		err(1, "Reading from '%s'", cmd);
 	pclose(p);
 
-	return strsplit(ctx, buffer, "\n", num);
+	return strsplit(ctx, buffer, "\n");
 }
 
-static int unlink_info(char *infofile)
+/* Be careful about trying to compile over running programs (parallel make).
+ * temp_file helps here. */
+static char *compile_info(const void *ctx, const char *dir)
 {
-	unlink(infofile);
-	return 0;
-}
+	char *info_c_file, *info, *ccandir, *compiled, *output;
+	size_t len;
+	int fd;
 
-/* Be careful about trying to compile over running programs (parallel make) */
-static char *compile_info(const void *ctx, const char *dir, const char *name)
-{
-	char *infofile = talloc_asprintf(ctx, "%s/info.%u", dir, getpid());
-	char *cmd = talloc_asprintf(ctx, "cc " CFLAGS
-				    " -o %s -x c %s/%s/_info",
-				    infofile, dir, name);
-	talloc_set_destructor(infofile, unlink_info);
-	if (system(cmd) != 0)
+	/* Copy it to a file with proper .c suffix. */
+	info = grab_file(ctx, talloc_asprintf(ctx, "%s/_info", dir), &len);
+	if (!info)
+		return NULL;
+
+	info_c_file = maybe_temp_file(ctx, ".c", false, "_info");
+	fd = open(info_c_file, O_WRONLY|O_CREAT|O_EXCL, 0600);
+	if (fd < 0)
+		return NULL;
+	if (!write_all(fd, info, len))
 		return NULL;
 
-	return infofile;
+	if (close(fd) != 0)
+		return NULL;
+
+	ccandir = talloc_dirname(ctx, dir);
+	*strrchr(ccandir, '/') = '\0';
+
+	compiled = maybe_temp_file(ctx, "", false, "info");
+	if (compile_and_link(ctx, info_c_file, ccandir, "", "", "",
+			     compiled, &output))
+		return compiled;
+	return NULL;
 }
 
 static char **get_one_deps(const void *ctx, const char *dir,
-			   const char *name, unsigned int *num)
+			   unsigned int *num, char **infofile)
 {
-	char **deps, *cmd, *infofile;
+	char **deps, *cmd;
 
-	infofile = compile_info(ctx, dir, name);
-	if (!infofile)
-		errx(1, "Could not compile _info for '%s'", name);
+	if (!*infofile) {
+		*infofile = compile_info(ctx, dir);
+		if (!*infofile)
+			errx(1, "Could not compile _info for '%s'", dir);
+	}
 
-	cmd = talloc_asprintf(ctx, "%s depends", infofile);
-	deps = lines_from_cmd(cmd, num, "%s", cmd);
+	cmd = talloc_asprintf(ctx, "%s depends", *infofile);
+	deps = lines_from_cmd(cmd, "%s", cmd);
 	if (!deps)
 		err(1, "Could not run '%s'", cmd);
+	/* FIXME: Do we need num arg? */
+	*num = talloc_array_length(deps) - 1;
 	return deps;
 }
 
@@ -96,21 +117,22 @@ static char *replace(const void *ctx, const char *src,
 
 /* This is a terrible hack.  We scan for ccan/ strings. */
 static char **get_one_safe_deps(const void *ctx,
-				const char *dir, const char *name,
-				unsigned int *num)
+				const char *dir,
+				unsigned int *num,
+				char **infofile)
 {
 	char **deps, **lines, *raw, *fname;
-	unsigned int i, n = 0;
+	unsigned int i, n;
 
-	fname = talloc_asprintf(ctx, "%s/%s/_info", dir, name);
+	fname = talloc_asprintf(ctx, "%s/_info", dir);
 	raw = grab_file(fname, fname, NULL);
 	if (!raw)
 		errx(1, "Could not open %s", fname);
 
 	/* Replace \n by actual line breaks, and split it. */
-	lines = strsplit(raw, replace(raw, raw, "\\n", "\n"), "\n", &n);
+	lines = strsplit(raw, replace(raw, raw, "\\n", "\n"), "\n");
 
-	deps = talloc_array(ctx, char *, n+1);
+	deps = talloc_array(ctx, char *, talloc_array_length(lines));
 
 	for (n = i = 0; lines[i]; i++) {
 		char *str;
@@ -154,23 +176,28 @@ static bool have_dep(char **deps, unsigned int num, const char *dep)
 
 /* Gets all the dependencies, recursively. */
 static char **
-get_all_deps(const void *ctx, const char *dir, const char *name,
-	     char **(*get_one)(const void *, const char *, const char *,
-			       unsigned int *))
+get_all_deps(const void *ctx, const char *dir,
+	     char **infofile,
+	     char **(*get_one)(const void *, const char *,
+			       unsigned int *, char **))
 {
 	char **deps;
 	unsigned int i, num;
 
-	deps = get_one(ctx, dir, name, &num);
+	deps = get_one(ctx, dir, &num, infofile);
 	for (i = 0; i < num; i++) {
 		char **newdeps;
 		unsigned int j, newnum;
+		char *subinfo = NULL;
+		char *subdir;
 
 		if (!strstarts(deps[i], "ccan/"))
 			continue;
 
-		newdeps = get_one(ctx, dir, deps[i] + strlen("ccan/"),
-				  &newnum);
+		subdir = talloc_asprintf(ctx, "%s/%s",
+					 talloc_dirname(ctx, dir),
+					 deps[i] + strlen("ccan/"));
+		newdeps = get_one(ctx, subdir, &newnum, &subinfo);
 
 		/* Should be short, so brute-force out dups. */
 		for (j = 0; j < newnum; j++) {
@@ -185,59 +212,52 @@ get_all_deps(const void *ctx, const char *dir, const char *name,
 	return deps;
 }
 
-char **get_deps(const void *ctx, const char *dir, const char *name,
-		bool recurse)
+char **get_libs(const void *ctx, const char *dir,
+		unsigned int *num, char **infofile)
 {
-	if (!recurse) {
-		unsigned int num;
-		return get_one_deps(ctx, dir, name, &num);
-	}
-	return get_all_deps(ctx, dir, name, get_one_deps);
-}
+	char **libs, *cmd;
 
-char **get_safe_ccan_deps(const void *ctx, const char *dir,
-			  const char *name, bool recurse)
-{
-	if (!recurse) {
-		unsigned int num;
-		return get_one_safe_deps(ctx, dir, name, &num);
+	if (!*infofile) {
+		*infofile = compile_info(ctx, dir);
+		if (!*infofile)
+			errx(1, "Could not compile _info for '%s'", dir);
 	}
-	return get_all_deps(ctx, dir, name, get_one_safe_deps);
-}
-	
-char *talloc_basename(const void *ctx, const char *dir)
-{
-	char *p = strrchr(dir, '/');
 
-	if (!p)
-		return (char *)dir;
-	return talloc_strdup(ctx, p+1);
+	cmd = talloc_asprintf(ctx, "%s libs", *infofile);
+	libs = lines_from_cmd(cmd, "%s", cmd);
+	if (!libs)
+		err(1, "Could not run '%s'", cmd);
+	/* FIXME: Do we need num arg? */
+	*num = talloc_array_length(libs) - 1;
+	return libs;
 }
 
-char *talloc_dirname(const void *ctx, const char *dir)
+char **get_deps(const void *ctx, const char *dir,
+		bool recurse, char **infofile)
 {
-	char *p = strrchr(dir, '/');
+	char *temp = NULL, **ret;
+	if (!infofile)
+		infofile = &temp;
 
-	if (!p)
-		return talloc_strdup(ctx, ".");
-	return talloc_strndup(ctx, dir, p - dir);
+	if (!recurse) {
+		unsigned int num;
+		ret = get_one_deps(ctx, dir, &num, infofile);
+	} else
+		ret = get_all_deps(ctx, dir, infofile, get_one_deps);
+
+	if (infofile == &temp && temp) {
+		unlink(temp);
+		talloc_free(temp);
+	}
+	return ret;
 }
 
-char *talloc_getcwd(const void *ctx)
+char **get_safe_ccan_deps(const void *ctx, const char *dir,
+			  bool recurse, char **infofile)
 {
-	unsigned int len;
-	char *cwd;
-
-	/* *This* is why people hate C. */
-	len = 32;
-	cwd = talloc_array(ctx, char, len);
-	while (!getcwd(cwd, len)) {
-		if (errno != ERANGE) {
-			talloc_free(cwd);
-			return NULL;
-		}
-		cwd = talloc_realloc(ctx, cwd, char, len *= 2);
+	if (!recurse) {
+		unsigned int num;
+		return get_one_safe_deps(ctx, dir, &num, infofile);
 	}
-	return cwd;
+	return get_all_deps(ctx, dir, infofile, get_one_safe_deps);
 }
-