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authorTejun Heo <htejun@gmail.com>2009-08-16 21:02:36 +0900
committerJeff Garzik <jgarzik@redhat.com>2009-09-08 21:17:48 -0400
commit3e5cd1f2576c720f1d0705fdd7ba64f27e8836b7 (patch)
tree631d41c950d2dc93c110ca86e779cb749c9a8987 /drivers/firmware/dmi_scan.c
parent02c24fa87724bb3af969463cd74dc3b3feb24740 (diff)
downloadlinux-3e5cd1f2576c720f1d0705fdd7ba64f27e8836b7.tar.bz2
dmi: extend dmi_get_year() to dmi_get_date()
There are cases where full date information is required instead of just the year. Add month and day parsing to dmi_get_year() and rename it to dmi_get_date(). As the original function only required '/' followed by any number of parseable characters at the end of the string, keep that behavior to avoid upsetting existing users. The new function takes dates of format [mm[/dd]]/yy[yy]. Year, month and date are checked to be in the ranges of [1-9999], [1-12] and [1-31] respectively and any invalid or out-of-range component is returned as zero. The dummy implementation is updated accordingly but the return value is updated to indicate field not found which is consistent with how other dummy functions behave. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/firmware/dmi_scan.c')
-rw-r--r--drivers/firmware/dmi_scan.c76
1 files changed, 58 insertions, 18 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 531e621677ce..938100f14b16 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -568,36 +568,76 @@ const struct dmi_device * dmi_find_device(int type, const char *name,
EXPORT_SYMBOL(dmi_find_device);
/**
- * dmi_get_year - Return year of a DMI date
- * @field: data index (like dmi_get_system_info)
+ * dmi_get_date - parse a DMI date
+ * @field: data index (see enum dmi_field)
+ * @yearp: optional out parameter for the year
+ * @monthp: optional out parameter for the month
+ * @dayp: optional out parameter for the day
*
- * Returns -1 when the field doesn't exist. 0 when it is broken.
+ * The date field is assumed to be in the form resembling
+ * [mm[/dd]]/yy[yy] and the result is stored in the out
+ * parameters any or all of which can be omitted.
+ *
+ * If the field doesn't exist, all out parameters are set to zero
+ * and false is returned. Otherwise, true is returned with any
+ * invalid part of date set to zero.
+ *
+ * On return, year, month and day are guaranteed to be in the
+ * range of [0,9999], [0,12] and [0,31] respectively.
*/
-int dmi_get_year(int field)
+bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
{
- int year;
- const char *s = dmi_get_system_info(field);
+ int year = 0, month = 0, day = 0;
+ bool exists;
+ const char *s, *y;
char *e;
- if (!s)
- return -1;
- if (*s == '\0')
- return 0;
- s = strrchr(s, '/');
- if (!s)
- return 0;
+ s = dmi_get_system_info(field);
+ exists = s;
+ if (!exists)
+ goto out;
- s += 1;
- year = simple_strtoul(s, &e, 10);
- if (s != e && year < 100) { /* 2-digit year */
+ /*
+ * Determine year first. We assume the date string resembles
+ * mm/dd/yy[yy] but the original code extracted only the year
+ * from the end. Keep the behavior in the spirit of no
+ * surprises.
+ */
+ y = strrchr(s, '/');
+ if (!y)
+ goto out;
+
+ y++;
+ year = simple_strtoul(y, &e, 10);
+ if (y != e && year < 100) { /* 2-digit year */
year += 1900;
if (year < 1996) /* no dates < spec 1.0 */
year += 100;
}
+ if (year > 9999) /* year should fit in %04d */
+ year = 0;
+
+ /* parse the mm and dd */
+ month = simple_strtoul(s, &e, 10);
+ if (s == e || *e != '/' || !month || month > 12) {
+ month = 0;
+ goto out;
+ }
- return year;
+ s = e + 1;
+ day = simple_strtoul(s, &e, 10);
+ if (s == y || s == e || *e != '/' || day > 31)
+ day = 0;
+out:
+ if (yearp)
+ *yearp = year;
+ if (monthp)
+ *monthp = month;
+ if (dayp)
+ *dayp = day;
+ return exists;
}
-EXPORT_SYMBOL(dmi_get_year);
+EXPORT_SYMBOL(dmi_get_date);
/**
* dmi_walk - Walk the DMI table and get called back for every record