env: Add env_export() wrapper

Implement env_export() wrapper, so that all implementers of saveenv() don't
have to call hexport_r(), crc32() etc. sequence . This trims down a bit of
code duplication.

Signed-off-by: Marek Vasut <marex@denx.de>

common/env_common.c

@@ -172,6 +172,23 @@ int env_import(const char *buf, int check)
 	return 0;
 }
 
+/* Emport the environment and generate CRC for it. */
+int env_export(env_t *env_out)
+{
+	char *res;
+	ssize_t	len;
+
+	res = (char *)env_out->data;
+	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (len < 0) {
+		error("Cannot export environment: errno = %d\n", errno);
+		return 1;
+	}
+	env_out->crc = crc32(0, env_out->data, ENV_SIZE);
+
+	return 0;
+}
+
 void env_relocate(void)
 {
 #if defined(CONFIG_NEEDS_MANUAL_RELOC)

common/env_dataflash.c

@@ -57,16 +57,11 @@ void env_relocate_spec(void)
 int saveenv(void)
 {
 	env_t env_new;
-	ssize_t	len;
+	int ret;
-	char	*res;
 
-	res = (char *)&env_new.data;
+	ret = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 	return write_dataflash(CONFIG_ENV_ADDR,
 				(unsigned long)&env_new,

common/env_eeprom.c

@@ -98,8 +98,6 @@ void env_relocate_spec(void)
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
-	char	*res;
 	int	rc;
 	unsigned int off	= CONFIG_ENV_OFFSET;
 #ifdef CONFIG_ENV_OFFSET_REDUND
@@ -109,13 +107,9 @@ int saveenv(void)
 
 	BUG_ON(env_ptr != NULL);
 
-	res = (char *)&env_new.data;
+	rc = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (rc)
-	if (len < 0) {
+		return rc;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	if (gd->env_valid == 1) {

common/env_fat.c

@@ -37,19 +37,14 @@ int env_init(void)
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
-	char	*res;
 	block_dev_desc_t *dev_desc = NULL;
 	int dev = FAT_ENV_DEVICE;
 	int part = FAT_ENV_PART;
 	int err;
 
-	res = (char *)&env_new.data;
+	err = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (err)
-	if (len < 0) {
+		return err;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
 
 #ifdef CONFIG_MMC
 	if (strcmp(FAT_ENV_INTERFACE, "mmc") == 0) {
@@ -79,7 +74,6 @@ int saveenv(void)
 		return 1;
 	}
 
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 	err = file_fat_write(FAT_ENV_FILE, (void *)&env_new, sizeof(env_t));
 	if (err == -1) {
 		printf("\n** Unable to write \"%s\" from %s%d:%d **\n",

common/env_flash.c

@@ -106,8 +106,7 @@ int env_init(void)
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
+	char	*saved_data = NULL;
-	char	*res, *saved_data = NULL;
 	char	flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 	int	rc = 1;
 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
@@ -125,13 +124,9 @@ int saveenv(void)
 	if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 		goto done;
 
-	res = (char *)&env_new.data;
+	rc = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (rc)
-	if (len < 0) {
+		return rc;
-		error("Cannot export environment: errno = %d\n", errno);
-		goto done;
-	}
-	env_new.crc	= crc32(0, env_new.data, ENV_SIZE);
 	env_new.flags	= new_flag;
 
 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
@@ -258,13 +253,9 @@ int saveenv(void)
 	if (flash_sect_protect(0, (long)flash_addr, end_addr))
 		goto done;
 
-	res = (char *)&env_new.data;
+	rc = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (rc)
-	if (len < 0) {
-		error("Cannot export environment: errno = %d\n", errno);
 		goto done;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 	puts("Erasing Flash...");
 	if (flash_sect_erase((long)flash_addr, end_addr))

common/env_mmc.c

@@ -118,8 +118,6 @@ static unsigned char env_flags;
 int saveenv(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
-	ssize_t	len;
-	char	*res;
 	struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 	u32	offset;
 	int	ret, copy = 0;
@@ -127,15 +125,9 @@ int saveenv(void)
 	if (init_mmc_for_env(mmc))
 		return 1;
 
-	res = (char *)&env_new->data;
+	ret = env_export(env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
-		error("Cannot export environment: errno = %d\n", errno);
-		ret = 1;
 		goto fini;
-	}
-
-	env_new->crc = crc32(0, &env_new->data[0], ENV_SIZE);
 
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	env_new->flags	= ++env_flags; /* increase the serial */

common/env_nand.c

@@ -181,8 +181,6 @@ int saveenv(void)
 {
 	int	ret = 0;
 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
-	ssize_t	len;
-	char	*res;
 	int	env_idx = 0;
 	static const struct env_location location[] = {
 		{
@@ -207,13 +205,10 @@ int saveenv(void)
 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 		return 1;
 
-	res = (char *)&env_new->data;
+	ret = env_export(env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
+
-		return 1;
-	}
-	env_new->crc   = crc32(0, env_new->data, ENV_SIZE);
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	env_new->flags = ++env_flags; /* increase the serial */
 	env_idx = (gd->env_valid == 1);

common/env_nvram.c

@@ -69,17 +69,11 @@ void env_relocate_spec(void)
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
-	char	*res;
 	int	rcode = 0;
 
-	res = (char *)&env_new.data;
+	rcode = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (rcode)
-	if (len < 0) {
+		return rcode;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
 	nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);

common/env_onenand.c

@@ -66,8 +66,7 @@ void env_relocate_spec(void)
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
+	int ret;
-	char	*res;
 	struct mtd_info *mtd = &onenand_mtd;
 #ifdef CONFIG_ENV_ADDR_FLEX
 	struct onenand_chip *this = &onenand_chip;
@@ -78,13 +77,9 @@ int saveenv(void)
 		.callback	= NULL,
 	};
 
-	res = (char *)&env_new.data;
+	ret = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 	instr.len = CONFIG_ENV_SIZE;
 #ifdef CONFIG_ENV_ADDR_FLEX

common/env_sf.c

@@ -47,8 +47,7 @@ static struct spi_flash *env_flash;
 int saveenv(void)
 {
 	env_t	env_new;
-	ssize_t	len;
+	char	*saved_buffer = NULL, flag = OBSOLETE_FLAG;
-	char	*res, *saved_buffer = NULL, flag = OBSOLETE_FLAG;
 	u32	saved_size, saved_offset, sector = 1;
 	int	ret;
 
@@ -62,13 +61,9 @@ int saveenv(void)
 		}
 	}
 
-	res = (char *)&env_new.data;
+	ret = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
-	env_new.crc	= crc32(0, env_new.data, ENV_SIZE);
 	env_new.flags	= ACTIVE_FLAG;
 
 	if (gd->env_valid == 1) {
@@ -225,10 +220,9 @@ out:
 int saveenv(void)
 {
 	u32	saved_size, saved_offset, sector = 1;
-	char	*res, *saved_buffer = NULL;
+	char	*saved_buffer = NULL;
 	int	ret = 1;
 	env_t	env_new;
-	ssize_t	len;
 
 	if (!env_flash) {
 		env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
@@ -260,13 +254,9 @@ int saveenv(void)
 			sector++;
 	}
 
-	res = (char *)&env_new.data;
+	ret = env_export(&env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
-		error("Cannot export environment: errno = %d\n", errno);
 		goto done;
-	}
-	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 
 	puts("Erasing SPI flash...");
 	ret = spi_flash_erase(env_flash, CONFIG_ENV_OFFSET,

common/env_ubi.c

@@ -37,15 +37,11 @@ static unsigned char env_flags;
 int saveenv(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
-	ssize_t	len;
+	int ret;
-	char *res;
 
-	res = (char *)&env_new->data;
+	ret = env_export(env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
 
 	if (ubi_part(CONFIG_ENV_UBI_PART, NULL)) {
 		printf("\n** Cannot find mtd partition \"%s\"\n",
@@ -53,7 +49,6 @@ int saveenv(void)
 		return 1;
 	}
 
-	env_new->crc = crc32(0, env_new->data, ENV_SIZE);
 	env_new->flags = ++env_flags; /* increase the serial */
 
 	if (gd->env_valid == 1) {
@@ -86,15 +81,11 @@ int saveenv(void)
 int saveenv(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
-	ssize_t	len;
+	int ret;
-	char *res;
 
-	res = (char *)&env_new->data;
+	ret = env_export(env_new);
-	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (ret)
-	if (len < 0) {
+		return ret;
-		error("Cannot export environment: errno = %d\n", errno);
-		return 1;
-	}
 
 	if (ubi_part(CONFIG_ENV_UBI_PART, NULL)) {
 		printf("\n** Cannot find mtd partition \"%s\"\n",
@@ -102,8 +93,6 @@ int saveenv(void)
 		return 1;
 	}
 
-	env_new->crc = crc32(0, env_new->data, ENV_SIZE);
-
 	if (ubi_volume_write(CONFIG_ENV_UBI_VOLUME, (void *)env_new,
 			     CONFIG_ENV_SIZE)) {
 		printf("\n** Unable to write env to %s:%s **\n",

include/environment.h

@@ -201,6 +201,9 @@ int set_default_vars(int nvars, char * const vars[]);
 /* Import from binary representation into hash table */
 int env_import(const char *buf, int check);
 
+/* Export from hash table into binary representation */
+int env_export(env_t *env_out);
+
 #endif /* DO_DEPS_ONLY */
 
 #endif /* _ENVIRONMENT_H_ */