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94 lines
1.9 KiB
94 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* /proc/bootconfig - Extra boot configuration |
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*/ |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/printk.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/bootconfig.h> |
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#include <linux/slab.h> |
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static char *saved_boot_config; |
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static int boot_config_proc_show(struct seq_file *m, void *v) |
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{ |
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if (saved_boot_config) |
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seq_puts(m, saved_boot_config); |
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return 0; |
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} |
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/* Rest size of buffer */ |
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#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) |
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/* Return the needed total length if @size is 0 */ |
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static int __init copy_xbc_key_value_list(char *dst, size_t size) |
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{ |
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struct xbc_node *leaf, *vnode; |
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char *key, *end = dst + size; |
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const char *val; |
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char q; |
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int ret = 0; |
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key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL); |
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xbc_for_each_key_value(leaf, val) { |
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ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX); |
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if (ret < 0) |
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break; |
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ret = snprintf(dst, rest(dst, end), "%s = ", key); |
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if (ret < 0) |
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break; |
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dst += ret; |
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vnode = xbc_node_get_child(leaf); |
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if (vnode) { |
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xbc_array_for_each_value(vnode, val) { |
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if (strchr(val, '"')) |
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q = '\''; |
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else |
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q = '"'; |
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ret = snprintf(dst, rest(dst, end), "%c%s%c%s", |
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q, val, q, vnode->next ? ", " : "\n"); |
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if (ret < 0) |
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goto out; |
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dst += ret; |
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} |
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} else { |
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ret = snprintf(dst, rest(dst, end), "\"\"\n"); |
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if (ret < 0) |
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break; |
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dst += ret; |
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} |
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} |
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out: |
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kfree(key); |
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return ret < 0 ? ret : dst - (end - size); |
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} |
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static int __init proc_boot_config_init(void) |
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{ |
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int len; |
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len = copy_xbc_key_value_list(NULL, 0); |
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if (len < 0) |
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return len; |
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if (len > 0) { |
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saved_boot_config = kzalloc(len + 1, GFP_KERNEL); |
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if (!saved_boot_config) |
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return -ENOMEM; |
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len = copy_xbc_key_value_list(saved_boot_config, len + 1); |
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if (len < 0) { |
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kfree(saved_boot_config); |
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return len; |
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} |
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} |
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proc_create_single("bootconfig", 0, NULL, boot_config_proc_show); |
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return 0; |
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} |
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fs_initcall(proc_boot_config_init);
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