init: builtins: Add 'copy' command to init.rc parser

Signed-off-by: San Mehat <san@google.com>

init/builtins.c

@@ -427,6 +427,68 @@ int do_write(int nargs, char **args)
     return write_file(args[1], args[2]);
 }
 
+int do_copy(int nargs, char **args)
+{
+    char *buffer = NULL;
+    int rc = 0;
+    int fd1 = -1, fd2 = -1;
+    struct stat info;
+    int brtw, brtr;
+    char *p;
+
+    if (nargs != 3)
+        return -1;
+
+    if (stat(args[1], &info) < 0) 
+        return -1;
+
+    if ((fd1 = open(args[1], O_RDONLY)) < 0) 
+        goto out_err;
+
+    if ((fd2 = open(args[2], O_WRONLY|O_CREAT, 0660)) < 0)
+        goto out_err;
+
+    if (!(buffer = malloc(info.st_size)))
+        goto out_err;
+
+    p = buffer;
+    brtr = info.st_size;
+    while(brtr) {
+        rc = read(fd1, p, brtr);
+        if (rc < 0)
+            goto out_err;
+        if (rc == 0)
+            break;
+        p += rc;
+        brtr -= rc;
+    }
+
+    p = buffer;
+    brtw = info.st_size;
+    while(brtw) {
+        rc = write(fd2, p, brtw);
+        if (rc < 0)
+            goto out_err;
+        if (rc == 0)
+            break;
+        p += rc;
+        brtw -= rc;
+    }
+
+    rc = 0;
+    goto out;
+out_err:
+    rc = -1;
+out:
+    if (buffer)
+        free(buffer);
+    if (fd1 >= 0)
+        close(fd1);
+    if (fd2 >= 0)
+        close(fd2);
+    return rc;
+}
+
 int do_chown(int nargs, char **args) {
     /* GID is optional. */
     if (nargs == 3) {

init/keywords.h

@@ -21,6 +21,7 @@ int do_trigger(int nargs, char **args);
 int do_symlink(int nargs, char **args);
 int do_sysclktz(int nargs, char **args);
 int do_write(int nargs, char **args);
+int do_copy(int nargs, char **args);
 int do_chown(int nargs, char **args);
 int do_chmod(int nargs, char **args);
 int do_loglevel(int nargs, char **args);
@@ -65,6 +66,7 @@ enum {
     KEYWORD(sysclktz,    COMMAND, 1, do_sysclktz)
     KEYWORD(user,        OPTION,  0, 0)
     KEYWORD(write,       COMMAND, 2, do_write)
+    KEYWORD(copy,        COMMAND, 2, do_copy)
     KEYWORD(chown,       COMMAND, 2, do_chown)
     KEYWORD(chmod,       COMMAND, 2, do_chmod)
     KEYWORD(loglevel,    COMMAND, 1, do_loglevel)

init/parser.c

@@ -127,6 +127,7 @@ int lookup_keyword(const char *s)
 {
     switch (*s++) {
     case 'c':
+	if (!strcmp(s, "opy")) return K_copy;
         if (!strcmp(s, "apability")) return K_capability;
         if (!strcmp(s, "lass")) return K_class;
         if (!strcmp(s, "lass_start")) return K_class_start;