gen_init_cpio: Add the ability to add files to the cpio image.

diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
index a6024fa..6f17ea0 100644 (file)
--- a/usr/gen_init_cpio.c
+++ b/usr/gen_init_cpio.c
@@ -5,10 +5,28 @@
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
+#include <fcntl.h>
 
 static unsigned int offset;
 static unsigned int ino = 721;
 
+static void push_string(const char *name)
+{
+       unsigned int name_len = strlen(name) + 1;
+
+       fputs(name, stdout);
+       putchar(0);
+       offset += name_len;
+}
+
+static void push_pad (void)
+{
+       while (offset & 3) {
+               putchar(0);
+               offset++;
+       }
+}
+
 static void push_rest(const char *name)
 {
        unsigned int name_len = strlen(name) + 1;
@@ -120,6 +138,78 @@ static void cpio_mknod(const char *name, unsigned int mode,
        push_rest(name);
 }
 
+/* Not marked static to keep the compiler quiet, as no one uses this yet... */
+void cpio_mkfile(const char *filename, const char *location,
+                       unsigned int mode, uid_t uid, gid_t gid)
+{
+       char s[256];
+       char *filebuf;
+       struct stat buf;
+       int file;
+       int retval;
+       int i;
+
+       mode |= S_IFREG;
+
+       retval = stat (filename, &buf);
+       if (retval) {
+               fprintf (stderr, "Filename %s could not be located\n", filename);
+               goto error;
+       }
+
+       file = open (filename, O_RDONLY);
+       if (file < 0) {
+               fprintf (stderr, "Filename %s could not be opened for reading\n", filename);
+               goto error;
+       }
+
+       filebuf = malloc(buf.st_size);
+       if (!filebuf) {
+               fprintf (stderr, "out of memory\n");
+               goto error_close;
+       }
+
+       retval = read (file, filebuf, buf.st_size);
+       if (retval < 0) {
+               fprintf (stderr, "Can not read %s file\n", filename);
+               goto error_free;
+       }
+
+       sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
+              "%08X%08X%08X%08X%08X%08X%08X",
+               "070701",               /* magic */
+               ino++,                  /* ino */
+               mode,                   /* mode */
+               (long) uid,             /* uid */
+               (long) gid,             /* gid */
+               1,                      /* nlink */
+               (long) buf.st_mtime,    /* mtime */
+               (int) buf.st_size,      /* filesize */
+               3,                      /* major */
+               1,                      /* minor */
+               0,                      /* rmajor */
+               0,                      /* rminor */
+               strlen(location) + 1,   /* namesize */
+               0);                     /* chksum */
+       push_hdr(s);
+       push_string(location);
+       push_pad();
+
+       for (i = 0; i < buf.st_size; ++i)
+               fputc(filebuf[i], stdout);
+       close(file);
+       free(filebuf);
+       push_pad();
+       return;
+       
+error_free:
+       free(filebuf);
+error_close:
+       close(file);
+error:
+       exit(-1);
+}
+
 int main (int argc, char *argv[])
 {
        cpio_mkdir("/dev", 0700, 0, 0);