From 0e949ff304a7ca07db38c17fbbf3ead1085d7bbf Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sun, 12 Feb 2006 22:47:04 +0900 Subject: [PATCH] [PATCH] libata: implement ata_dev_id_c_string() ata_dev_id_c_string() reads ATA string from the specified offset of the given IDENTIFY PAGE and puts it in the specified buffer in trimmed and NULL-terminated form. The caller must supply a buffer which is one byte larger than the maximum size of the target ID string. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/scsi/libata-core.c | 29 +++++++++++++++++++++++++++++ include/linux/libata.h | 2 ++ 2 files changed, 31 insertions(+) diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 9ddb568267..7e410299d6 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -519,6 +519,34 @@ void ata_dev_id_string(const u16 *id, unsigned char *s, } } +/** + * ata_dev_id_c_string - Convert IDENTIFY DEVICE page into C string + * @id: IDENTIFY DEVICE results we will examine + * @s: string into which data is output + * @ofs: offset into identify device page + * @len: length of string to return. must be an odd number. + * + * This function is identical to ata_dev_id_string except that it + * trims trailing spaces and terminates the resulting string with + * null. @len must be actual maximum length (even number) + 1. + * + * LOCKING: + * caller. + */ +void ata_dev_id_c_string(const u16 *id, unsigned char *s, + unsigned int ofs, unsigned int len) +{ + unsigned char *p; + + WARN_ON(!(len & 1)); + + ata_dev_id_string(id, s, ofs, len - 1); + + p = s + strnlen(s, len - 1); + while (p > s && p[-1] == ' ') + p--; + *p = '\0'; +} /** * ata_noop_dev_select - Select device 0/1 on ATA bus @@ -4905,6 +4933,7 @@ EXPORT_SYMBOL_GPL(ata_scsi_release); EXPORT_SYMBOL_GPL(ata_host_intr); EXPORT_SYMBOL_GPL(ata_dev_classify); EXPORT_SYMBOL_GPL(ata_dev_id_string); +EXPORT_SYMBOL_GPL(ata_dev_id_c_string); EXPORT_SYMBOL_GPL(ata_dev_config); EXPORT_SYMBOL_GPL(ata_scsi_simulate); EXPORT_SYMBOL_GPL(ata_eh_qc_complete); diff --git a/include/linux/libata.h b/include/linux/libata.h index 83a1f2ead8..0853032673 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -540,6 +540,8 @@ extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, extern unsigned int ata_dev_classify(const struct ata_taskfile *tf); extern void ata_dev_id_string(const u16 *id, unsigned char *s, unsigned int ofs, unsigned int len); +extern void ata_dev_id_c_string(const u16 *id, unsigned char *s, + unsigned int ofs, unsigned int len); extern void ata_dev_config(struct ata_port *ap, unsigned int i); extern void ata_bmdma_setup (struct ata_queued_cmd *qc); extern void ata_bmdma_start (struct ata_queued_cmd *qc); -- 2.39.2