X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=tools%2Fdepends.c;h=c107f4b330c28a2a2473da87aea02cb267a43d6b;hp=aaae03a94a655d4c9fe8a3d0c686253fb21d0777;hb=6a8d296f9383dd25ec381e2ab136a33823d140e5;hpb=437fa285d12183a0f1e7450b3a01cbe5620a3507

diff --git a/tools/depends.c b/tools/depends.c
index aaae03a9..c107f4b3 100644
--- a/tools/depends.c
+++ b/tools/depends.c
@@ -1,9 +1,19 @@
-#include "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, 2, 3)))
-lines_from_cmd(const void *ctx, char *format, ...)
+lines_from_cmd(const void *ctx, const char *format, ...)
 {
 	va_list ap;
 	char *cmd, *buffer;
@@ -17,35 +27,260 @@ lines_from_cmd(const void *ctx, char *format, ...)
 	if (!p)
 		err(1, "Executing '%s'", cmd);
 
-	buffer = grab_fd(ctx, fileno(p));
+	buffer = grab_fd(ctx, fileno(p), NULL);
 	if (!buffer)
 		err(1, "Reading from '%s'", cmd);
 	pclose(p);
 
-	return split(ctx, buffer, "\n", NULL);
+	return strsplit(ctx, buffer, "\n");
 }
 
-static char *build_info(const void *ctx, const char *dir)
+/* 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 *file, *cfile, *cmd;
+	char *info_c_file, *info, *ccandir, *compiled, *output;
+	size_t len;
+	int fd;
 
-	cfile = talloc_asprintf(ctx, "%s/%s", dir, "_info.c");
-	file = talloc_asprintf(cfile, "%s/%s", dir, "_info");
-	cmd = talloc_asprintf(file, "gcc " CFLAGS " -o %s %s", file, cfile);
-	if (system(cmd) != 0)
-		errx(1, "Failed to compile %s", file);
+	/* 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 file;
+	info_c_file = temp_file(ctx, ".c", "_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 = temp_file(ctx, "", "info");
+	if (compile_and_link(ctx, info_c_file, ccandir, "",
+			     CCAN_COMPILER, CCAN_CFLAGS " -I.", "",
+			     compiled, &output))
+		return compiled;
+	return NULL;
 }
 
-char **get_deps(const void *ctx, const char *dir)
+static char **get_one_deps(const void *ctx, const char *dir, char **infofile)
 {
 	char **deps, *cmd;
 
-	cmd = talloc_asprintf(ctx, "%s depends", build_info(ctx, dir));
-	deps = lines_from_cmd(cmd, cmd);
+	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, "%s", cmd);
 	if (!deps)
 		err(1, "Could not run '%s'", cmd);
 	return deps;
 }
 
+/* Make copy of src, replacing "from" with "to". */
+static char *replace(const void *ctx, const char *src,
+		     const char *from, const char *to)
+{
+	char *ret = talloc_strdup(ctx, "");
+	unsigned int rlen, len, add;
+
+	rlen = len = 0;
+	for (;;) {
+		const char *next = strstr(src+len, from);
+		if (!next)
+			add = strlen(src+len) + 1;
+		else
+			add = next - (src+len);
+
+		ret = talloc_realloc(ctx, ret, char, rlen + add + strlen(to)+1);
+		memcpy(ret+rlen, src+len, add);
+		if (!next)
+			return ret;
+		len += add;
+		rlen += add;
+		strcpy(ret+rlen, to);
+		rlen += strlen(to);
+		len += strlen(from);
+	}
+}
+
+/* This is a terrible hack.  We scan for ccan/ strings. */
+static char **get_one_safe_deps(const void *ctx,
+				const char *dir,
+				char **infofile)
+{
+	char **deps, **lines, *raw, *fname;
+	unsigned int i, n;
+
+	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");
+
+	deps = talloc_array(ctx, char *, talloc_array_length(lines));
+
+	for (n = i = 0; lines[i]; i++) {
+		char *str;
+		unsigned int len;
+
+		/* Ignore lines starting with # (e.g. #include) */
+		if (lines[i][0] == '#')
+			continue;
+
+		/* Start of line, or after ". */
+		if (strstarts(lines[i], "ccan/"))
+			str = lines[i];
+		else {
+			str = strstr(lines[i], "\"ccan/");
+			if (!str)
+				continue;
+			str++;
+		}
+		
+		len = strspn(str, "/abcdefghijklmnopqrstuvxwyz12345678980_");
+		if (len == 5)
+			continue;
+		deps[n++] = talloc_strndup(deps, str, len);
+	}
+	deps[n] = NULL;
+	talloc_free(fname);
+
+	/* Make sure talloc_array_length() works */
+	return talloc_realloc(NULL, deps, char *, n + 1);
+}
+
+static bool have_dep(char **deps, const char *dep)
+{
+	unsigned int 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 **infofile,
+	     char **(*get_one)(const void *, const char *, char **))
+{
+	char **deps;
+	unsigned int i;
+
+	deps = get_one(ctx, dir, infofile);
+	for (i = 0; i < talloc_array_length(deps)-1; i++) {
+		char **newdeps;
+		unsigned int j;
+		char *subinfo = NULL;
+		char *subdir;
+
+		if (!strstarts(deps[i], "ccan/"))
+			continue;
+
+		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 < 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+1] = NULL;
+		}
+	}
+	return deps;
+}
+
+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) {
+		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 uniquify_deps(ret);
+}
+
+char **get_safe_ccan_deps(const void *ctx, const char *dir,
+			  bool recurse)
+{
+	char **ret;
+	if (!recurse) {
+		ret = get_one_safe_deps(ctx, dir, NULL);
+	} else {
+		ret = get_all_deps(ctx, dir, NULL, get_one_safe_deps);
+	}
+	return uniquify_deps(ret);
+}