X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=tools%2Fdepends.c;h=f1e45c50ebc5fb37c1cf8a44becfbd8141c56f2d;hp=c9cf88164cd81e37b4981e1e7da1f5a51756609d;hb=0959991a0cae77bd404dee266aaf0667e51a459e;hpb=570c9c555f076e74f46141bb42b5d1d7ac89f632

diff --git a/tools/depends.c b/tools/depends.c
index c9cf8816..f1e45c50 100644
--- a/tools/depends.c
+++ b/tools/depends.c
@@ -1,14 +1,19 @@
-#include <ccan/talloc/talloc.h>
 #include <ccan/str/str.h>
+#include <ccan/talloc/talloc.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, const char *format, ...)
 {
 	va_list ap;
 	char *cmd, *buffer;
@@ -27,38 +32,56 @@ 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);
-}
-
-static int unlink_info(char *infofile)
-{
-	unlink(infofile);
-	return 0;
+	return strsplit(ctx, buffer, "\n");
 }
 
-/* Be careful about trying to compile over running programs (parallel make) */
+/* 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)
 {
-	char *infofile = talloc_asprintf(ctx, "%s/info.%u", dir, getpid());
-	char *cmd = talloc_asprintf(ctx, "cc " CFLAGS " -o %s -x c %s/_info",
-				    infofile, dir);
-	talloc_set_destructor(infofile, unlink_info);
-	if (system(cmd) != 0)
+	char *info_c_file, *info, *ccandir, *compiled, *output;
+	size_t len;
+	int fd;
+
+	/* Copy it to a file with proper .c suffix. */
+	info = grab_file(ctx, talloc_asprintf(ctx, "%s/_info", dir), &len);
+	if (!info)
 		return NULL;
 
-	return infofile;
+	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;
+
+	if (close(fd) != 0)
+		return NULL;
+
+	ccandir = talloc_dirname(ctx, dir);
+	if (strrchr(ccandir, '/'))
+		*strrchr(ccandir, '/') = '\0';
+
+	compiled = maybe_temp_file(ctx, "", false, "info");
+	if (compile_and_link(ctx, info_c_file, ccandir, "",
+			     CCAN_COMPILER, CCAN_CFLAGS " -I.", "",
+			     compiled, &output))
+		return compiled;
+	return NULL;
 }
 
-static char **get_one_deps(const void *ctx, const char *dir, unsigned int *num)
+static char **get_one_deps(const void *ctx, const char *dir, char **infofile)
 {
-	char **deps, *cmd, *infofile;
+	char **deps, *cmd;
 
-	infofile = compile_info(ctx, dir);
-	if (!infofile)
-		errx(1, "Could not compile _info for '%s'", dir);
+	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);
 	return deps;
@@ -93,10 +116,11 @@ 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, unsigned int *num)
+				const char *dir,
+				char **infofile)
 {
 	char **deps, **lines, *raw, *fname;
-	unsigned int i, n = 0;
+	unsigned int i, n;
 
 	fname = talloc_asprintf(ctx, "%s/_info", dir);
 	raw = grab_file(fname, fname, NULL);
@@ -104,9 +128,9 @@ static char **get_one_safe_deps(const void *ctx,
 		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;
@@ -133,67 +157,130 @@ static char **get_one_safe_deps(const void *ctx,
 	}
 	deps[n] = NULL;
 	talloc_free(fname);
-	if (num)
-		*num = n;
-	return deps;
+
+	/* Make sure talloc_array_length() works */
+	return talloc_realloc(NULL, deps, char *, n + 1);
 }
 
-static bool have_dep(char **deps, unsigned int num, const char *dep)
+static bool have_dep(char **deps, const char *dep)
 {
 	unsigned int i;
 
-	for (i = 0; i < num; i++)
+	for (i = 0; deps[i]; i++)
 		if (streq(deps[i], dep))
 			return true;
 	return false;
 }
 
+
+
 /* Gets all the dependencies, recursively. */
 static char **
 get_all_deps(const void *ctx, const char *dir,
-	     char **(*get_one)(const void *, const char *, unsigned int *))
+	     char **infofile,
+	     char **(*get_one)(const void *, const char *, char **))
 {
 	char **deps;
-	unsigned int i, num;
+	unsigned int i;
 
-	deps = get_one(ctx, dir, &num);
-	for (i = 0; i < num; i++) {
+	deps = get_one(ctx, dir, infofile);
+	for (i = 0; i < talloc_array_length(deps)-1; i++) {
 		char **newdeps;
-		unsigned int j, newnum;
+		unsigned int j;
+		char *subinfo = NULL;
+		char *subdir;
 
 		if (!strstarts(deps[i], "ccan/"))
 			continue;
 
-		newdeps = get_one(ctx, deps[i], &newnum);
+		subdir = talloc_asprintf(ctx, "%s/%s",
+					 talloc_dirname(ctx, dir),
+					 deps[i] + strlen("ccan/"));
+		newdeps = get_one(ctx, subdir, &subinfo);
 
 		/* Should be short, so brute-force out dups. */
-		for (j = 0; j < newnum; j++) {
-			if (have_dep(deps, num, newdeps[j]))
+		for (j = 0; j < talloc_array_length(newdeps)-1; j++) {
+			unsigned int num;
+
+			if (have_dep(deps, newdeps[j]))
 				continue;
 
+			num = talloc_array_length(deps)-1;
 			deps = talloc_realloc(NULL, deps, char *, num + 2);
-			deps[num++] = newdeps[j];
-			deps[num] = NULL;
+			deps[num] = newdeps[j];
+			deps[num+1] = NULL;
 		}
 	}
 	return deps;
 }
 
-char **get_deps(const void *ctx, const char *dir, bool recurse)
+char **get_libs(const void *ctx, const char *dir,
+		unsigned int *num, char **infofile)
+{
+	char **libs, *cmd;
+
+	if (!*infofile) {
+		*infofile = compile_info(ctx, dir);
+		if (!*infofile)
+			errx(1, "Could not compile _info for '%s'", dir);
+	}
+
+	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;
+}
+
+/* FIXME: This is O(n^2), which is dumb. */
+static char **uniquify_deps(char **deps)
 {
+	unsigned int i, j, num;
+
+	num = talloc_array_length(deps) - 1;
+	for (i = 0; i < num; i++) {
+		for (j = i + 1; j < num; j++) {
+			if (streq(deps[i], deps[j])) {
+				memmove(&deps[j], &deps[j+1],
+					(num - j - 1) * sizeof(char *));
+				num--;
+			}
+		}
+	}
+	deps[num] = NULL;
+	/* Make sure talloc_array_length() works */
+	return talloc_realloc(NULL, deps, char *, num + 1);
+}
+
+char **get_deps(const void *ctx, const char *dir,
+		bool recurse, char **infofile)
+{
+	char *temp = NULL, **ret;
+	if (!infofile)
+		infofile = &temp;
+
 	if (!recurse) {
-		unsigned int num;
-		return get_one_deps(ctx, dir, &num);
+		ret = get_one_deps(ctx, dir, infofile);
+	} else
+		ret = get_all_deps(ctx, dir, infofile, get_one_deps);
+
+	if (infofile == &temp && temp) {
+		unlink(temp);
+		talloc_free(temp);
 	}
-	return get_all_deps(ctx, dir, get_one_deps);
+	return uniquify_deps(ret);
 }
 
-char **get_safe_ccan_deps(const void *ctx, const char *dir, bool recurse)
+char **get_safe_ccan_deps(const void *ctx, const char *dir,
+			  bool recurse)
 {
+	char **ret;
 	if (!recurse) {
-		unsigned int num;
-		return get_one_safe_deps(ctx, dir, &num);
+		ret = get_one_safe_deps(ctx, dir, NULL);
+	} else {
+		ret = get_all_deps(ctx, dir, NULL, get_one_safe_deps);
 	}
-	return get_all_deps(ctx, dir, get_one_safe_deps);
+	return uniquify_deps(ret);
 }
-