LXR linux-old/fs/hfsplus/options.c

   1/*
   2 *  linux/fs/hfsplus/options.c
   3 *
   4 * Copyright (C) 2001
   5 * Brad Boyer (flar@allandria.com)
   6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7 *
   8 * Option parsing
   9 */
  10
  11#include <linux/string.h>
  12#include <linux/kernel.h>
  13#include <linux/sched.h>
  14#include "hfsplus_fs.h"
  15
  16/* Initialize an options object to reasonable defaults */
  17void fill_defaults(struct hfsplus_sb_info *opts)
  18{
  19        if (!opts)
  20                return;
  21
  22        opts->creator = HFSPLUS_DEF_CR_TYPE;
  23        opts->type = HFSPLUS_DEF_CR_TYPE;
  24        opts->charcase = HFSPLUS_CASE_ASIS;
  25        opts->fork = HFSPLUS_FORK_RAW;
  26        opts->namemap = HFSPLUS_NAMES_TRIVIAL;
  27        opts->umask = current->fs->umask;
  28        opts->uid = current->uid;
  29        opts->gid = current->gid;
  30}
  31
  32#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
  33/* Copy settings from one hfsplus_sb_info object to another */
  34void fill_current(struct hfsplus_sb_info *curopts,
  35                  struct hfsplus_sb_info *opts)
  36{
  37        if (!curopts || !opts)
  38                return;
  39
  40        opts->creator = curopts->creator;
  41        opts->type = curopts->type;
  42        opts->charcase = curopts->charcase;
  43        opts->fork = curopts->fork;
  44        opts->namemap = curopts->namemap;
  45        opts->umask = curopts->umask;
  46        opts->uid = curopts->uid;
  47        opts->gid = curopts->gid;
  48}
  49#endif
  50
  51/* convert a "four byte character" to a 32 bit int with error checks */
  52static int fill_fourchar(u32 *result, char *input)
  53{
  54        u32 out;
  55        int i;
  56
  57        if (!result || !input || !*input || (strlen(input) != 4))
  58                return 0;
  59
  60        for (out = 0, i = 0; i < 4; i++) {
  61                out <<= 8;
  62                out |= ((int)(input[i])) & 0xFF;
  63        }
  64        *result = out;
  65        return 1;
  66}
  67
  68/* convert a string to int with error checks */
  69static int fill_int(int *result, char *input, int base)
  70{
  71        char *tmp = input;
  72        int intval;
  73
  74        if (!result || !input || !*input)
  75                return 0;
  76
  77        intval = simple_strtoul(tmp, &tmp, base);
  78        if (*tmp)
  79                return 0;
  80
  81        *result = intval;
  82        return 1;
  83}
  84
  85/* Parse options from mount. Returns 0 on failure */
  86/* input is the options passed to mount() as a string */
  87int parse_options(char *input, struct hfsplus_sb_info *results)
  88{
  89        char *curropt, *value;
  90        int tmp;
  91
  92        if (!input)
  93                return 1;
  94
  95        while ((curropt = strsep(&input,",")) != NULL) {
  96                if (!*curropt)
  97                        continue;
  98
  99                if ((value = strchr(curropt, '=')) != NULL)
 100                        *value++ = '\0';
 101
 102                if (!strcmp(curropt, "creator")) {
 103                        if (!fill_fourchar(&(results->creator), value)) {
 104                                printk("HFS+-fs: creator requires a 4 character value\n");
 105                                return 0;
 106                        }
 107                } else if (!strcmp(curropt, "type")) {
 108                        if (!fill_fourchar(&(results->type), value)) {
 109                                printk("HFS+-fs: type requires a 4 character value\n");
 110                                return 0;
 111                        }
 112                } else if (!strcmp(curropt, "case")) {
 113                } else if (!strcmp(curropt, "fork")) {
 114                } else if (!strcmp(curropt, "names")) {
 115                } else if (!strcmp(curropt, "umask")) {
 116                        if (!fill_int(&tmp, value, 8)) {
 117                                printk("HFS+-fs: umask requires a value\n");
 118                                return 0;
 119                        }
 120                        results->umask = (umode_t)tmp;
 121                } else if (!strcmp(curropt, "uid")) {
 122                        if (!fill_int(&tmp, value, 0)) {
 123                                printk("HFS+-fs: uid requires an argument\n");
 124                                return 0;
 125                        }
 126                        results->uid = (uid_t)tmp;
 127                } else if (!strcmp(curropt, "gid")) {
 128                        if (!fill_int(&tmp, value, 0)) {
 129                                printk("HFS+-fs: gid requires an argument\n");
 130                                return 0;
 131                        }
 132                        results->gid = (gid_t)tmp;
 133                } else {
 134                        printk("HFS+-fs: unknown option %s\n", curropt);
 135                        return 0;
 136                }
 137        }
 138
 139        return 1;
 140}
 141