Add modinfo by Andre Renaud.

1 files changed, 105 insertions, 0 deletions

diff --git a/toys/modinfo.c b/toys/modinfo.c
new file mode 100644
index 00000000..0e32fc66
--- /dev/null
+++ b/toys/modinfo.c
@@ -0,0 +1,105 @@
+/* vi: set sw=4 ts=4:
+ *
+ * modinfo.c - Display module info
+ *
+ * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
+ *
+
+USE_MODINFO(NEWTOY(modinfo, "<1F:0", TOYFLAG_BIN))
+
+config MODINFO
+	bool "modinfo"
+	default y
+	help
+	  usage: modinfo [-0] [-F field] [modulename...]
+*/
+
+#include "toys.h"
+
+#define FLAG_0  (1 << 0)
+
+DEFINE_GLOBALS(
+    char *field;
+)
+#define TT this.modinfo
+
+static const char *modinfo_tags[] = {
+    "alias", "license", "description", "author", "vermagic",
+    "srcversion", "intree", "parm", "depends",
+};
+
+static void output_field(const char *field, const char *value)
+{
+    int len;
+
+    if (TT.field && strcmp(TT.field, field) != 0)
+        return;
+
+    len = strlen(field);
+
+    if (TT.field)
+        xprintf("%s", value);
+    else
+        xprintf("%s:%*s%s",
+                field, 15 - len, "", value);
+    if (toys.optflags & FLAG_0)
+        xwrite(fileno(stdout), "\0", 1);
+    else
+        xputs("");
+}
+
+
+static void modinfo_file(struct dirtree *dir)
+{
+    int fd, len, i;
+    char *buf, *pos;
+    char *full_name;
+
+    full_name = dirtree_path(dir, NULL);
+
+    output_field("filename", full_name);
+    fd = xopen(full_name, O_RDONLY);
+    len = fdlength(fd);
+    buf = xmalloc(len);
+    xreadall(fd, buf, len);
+
+    for (pos = buf; pos < buf + len + 10; pos++) {
+        if (*pos)
+            continue;
+
+        for (i = 0; i < sizeof(modinfo_tags) / sizeof(modinfo_tags[0]); i++) {
+            const char *str = modinfo_tags[i];
+            int len = strlen(str); 
+            if (strncmp(pos + 1, str, len) == 0 && pos[len + 1] == '=')
+                output_field(str, &pos[len + 2]);
+        }
+    }
+
+    free(full_name);
+    free(buf);
+    close(fd);
+}
+
+static int check_module(struct dirtree *new)
+{
+    if (S_ISREG(new->st.st_mode)) {
+        char **s;
+        for (s = toys.optargs; *s; s++) {
+            int len = strlen(*s);
+            if (strncmp(*s, new->name, len) == 0 &&
+                    strcmp(&new->name[len], ".ko") == 0)
+                modinfo_file(new);
+        }
+    }
+
+    return dirtree_notdotdot(new);
+}
+
+void modinfo_main(void)
+{
+    struct utsname uts;
+    if (uname(&uts) < 0)
+        perror_exit("unable to determine uname");
+    sprintf(toybuf, "/lib/modules/%s", uts.release);
+    dirtree_read(toybuf, check_module);
+}