Tools: set multiple variable with fw_setenv utility
Add a sort of batch mode to fw_setenv, allowing to set
multiple variables in one shot, without updating the flash after
each set as now. It is added the possibility to pass
a config file with a list of pairs <variable, value> to be set,
separated by a TAB character.
Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index a46205d..04f3bf0 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -45,8 +45,7 @@
#include "fw_env.h"
-#define CMD_GETENV "fw_printenv"
-#define CMD_SETENV "fw_setenv"
+#define WHITESPACE(c) ((c == '\t') || (c == ' '))
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
@@ -210,7 +209,6 @@
static int flash_io (int mode);
static char *envmatch (char * s1, char * s2);
-static int env_init (void);
static int parse_config (void);
#if defined(CONFIG_FILE)
@@ -225,6 +223,22 @@
return rc;
}
+static char *fw_string_blank(char *s, int noblank)
+{
+ int i;
+ int len = strlen(s);
+
+ for (i = 0; i < len; i++, s++) {
+ if ((noblank && !WHITESPACE(*s)) ||
+ (!noblank && WHITESPACE(*s)))
+ break;
+ }
+ if (i == len)
+ return NULL;
+
+ return s;
+}
+
/*
* Search the environment for a variable.
* Return the value, if found, or NULL, if not found.
@@ -233,7 +247,7 @@
{
char *env, *nxt;
- if (env_init ())
+ if (fw_env_open())
return NULL;
for (env = environment.data; *env; env = nxt + 1) {
@@ -264,7 +278,7 @@
int i, n_flag;
int rc = 0;
- if (env_init ())
+ if (fw_env_open())
return -1;
if (argc == 1) { /* Print all env variables */
@@ -327,30 +341,34 @@
return rc;
}
-/*
- * Deletes or sets environment variables. Returns -1 and sets errno error codes:
- * 0 - OK
- * EINVAL - need at least 1 argument
- * EROFS - certain variables ("ethaddr", "serial#") cannot be
- * modified or deleted
- *
- */
-int fw_setenv (int argc, char *argv[])
+int fw_env_close(void)
{
- int i, len;
- char *env, *nxt;
- char *oldval = NULL;
- char *name;
+ /*
+ * Update CRC
+ */
+ *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
- if (argc < 2) {
- errno = EINVAL;
- return -1;
+ /* write environment back to flash */
+ if (flash_io(O_RDWR)) {
+ fprintf(stderr,
+ "Error: can't write fw_env to flash\n");
+ return -1;
}
- if (env_init ())
- return -1;
+ return 0;
+}
- name = argv[1];
+
+/*
+ * Set/Clear a single variable in the environment.
+ * This is called in sequence to update the environment
+ * in RAM without updating the copy in flash after each set
+ */
+int fw_env_write(char *name, char *value)
+{
+ int len;
+ char *env, *nxt;
+ char *oldval = NULL;
/*
* search if variable with this name already exists
@@ -358,7 +376,7 @@
for (nxt = env = environment.data; *env; env = nxt + 1) {
for (nxt = env; *nxt; ++nxt) {
if (nxt >= &environment.data[ENV_SIZE]) {
- fprintf (stderr, "## Error: "
+ fprintf(stderr, "## Error: "
"environment not terminated\n");
errno = EINVAL;
return -1;
@@ -396,8 +414,8 @@
}
/* Delete only ? */
- if (argc < 3)
- goto WRITE_FLASH;
+ if (!value || !strlen(value))
+ return 0;
/*
* Append new definition at the end
@@ -411,41 +429,202 @@
*/
len = strlen (name) + 2;
/* add '=' for first arg, ' ' for all others */
- for (i = 2; i < argc; ++i) {
- len += strlen (argv[i]) + 1;
- }
+ len += strlen(value) + 1;
+
if (len > (&environment.data[ENV_SIZE] - env)) {
fprintf (stderr,
"Error: environment overflow, \"%s\" deleted\n",
name);
return -1;
}
+
while ((*env = *name++) != '\0')
env++;
- for (i = 2; i < argc; ++i) {
- char *val = argv[i];
-
- *env = (i == 2) ? '=' : ' ';
- while ((*++env = *val++) != '\0');
- }
+ *env = '=';
+ while ((*++env = *value++) != '\0')
+ ;
/* end is marked with double '\0' */
*++env = '\0';
- WRITE_FLASH:
+ return 0;
+}
- /*
- * Update CRC
- */
- *environment.crc = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
+/*
+ * Deletes or sets environment variables. Returns -1 and sets errno error codes:
+ * 0 - OK
+ * EINVAL - need at least 1 argument
+ * EROFS - certain variables ("ethaddr", "serial#") cannot be
+ * modified or deleted
+ *
+ */
+int fw_setenv(int argc, char *argv[])
+{
+ int i, len;
+ char *name;
+ char *value = NULL;
+ char *tmpval = NULL;
- /* write environment back to flash */
- if (flash_io (O_RDWR)) {
- fprintf (stderr, "Error: can't write fw_env to flash\n");
+ if (argc < 2) {
+ errno = EINVAL;
return -1;
}
- return 0;
+ if (fw_env_open()) {
+ fprintf(stderr, "Error: environment not initialized\n");
+ return -1;
+ }
+
+ name = argv[1];
+
+ len = strlen(name) + 2;
+ for (i = 2; i < argc; ++i)
+ len += strlen(argv[i]) + 1;
+
+ /* Allocate enough place to the data string */
+ for (i = 2; i < argc; ++i) {
+ char *val = argv[i];
+ if (!value) {
+ value = (char *)malloc(len - strlen(name));
+ if (!value) {
+ fprintf(stderr,
+ "Cannot malloc %u bytes: %s\n",
+ len - strlen(name), strerror(errno));
+ return -1;
+ }
+ memset(value, 0, len - strlen(name));
+ tmpval = value;
+ }
+ if (i != 2)
+ *tmpval++ = ' ';
+ while (*val != '\0')
+ *tmpval++ = *val++;
+ }
+
+ fw_env_write(name, value);
+
+ if (value)
+ free(value);
+
+ return fw_env_close();
+}
+
+/*
+ * Parse a file and configure the u-boot variables.
+ * The script file has a very simple format, as follows:
+ *
+ * Each line has a couple with name, value:
+ * <white spaces>variable_name<white spaces>variable_value
+ *
+ * Both variable_name and variable_value are interpreted as strings.
+ * Any character after <white spaces> and before ending \r\n is interpreted
+ * as variable's value (no comment allowed on these lines !)
+ *
+ * Comments are allowed if the first character in the line is #
+ *
+ * Returns -1 and sets errno error codes:
+ * 0 - OK
+ * -1 - Error
+ */
+int fw_parse_script(char *fname)
+{
+ FILE *fp;
+ char dump[1024]; /* Maximum line length in the file */
+ char *name;
+ char *val;
+ int lineno = 0;
+ int len;
+ int ret = 0;
+
+ if (fw_env_open()) {
+ fprintf(stderr, "Error: environment not initialized\n");
+ return -1;
+ }
+
+ if (strcmp(fname, "-") == 0)
+ fp = stdin;
+ else {
+ fp = fopen(fname, "r");
+ if (fp == NULL) {
+ fprintf(stderr, "I cannot open %s for reading\n",
+ fname);
+ return -1;
+ }
+ }
+
+ while (fgets(dump, sizeof(dump), fp)) {
+ lineno++;
+ len = strlen(dump);
+
+ /*
+ * Read a whole line from the file. If the line is too long
+ * or is not terminated, reports an error and exit.
+ */
+ if (dump[len - 1] != '\n') {
+ fprintf(stderr,
+ "Line %d not corrected terminated or too long\n",
+ lineno);
+ ret = -1;
+ break;
+ }
+
+ /* Drop ending line feed / carriage return */
+ while (len > 0 && (dump[len - 1] == '\n' ||
+ dump[len - 1] == '\r')) {
+ dump[len - 1] = '\0';
+ len--;
+ }
+
+ /* Skip comment or empty lines */
+ if ((len == 0) || dump[0] == '#')
+ continue;
+
+ /*
+ * Search for variable's name,
+ * remove leading whitespaces
+ */
+ name = fw_string_blank(dump, 1);
+ if (!name)
+ continue;
+
+ /* The first white space is the end of variable name */
+ val = fw_string_blank(name, 0);
+ len = strlen(name);
+ if (val) {
+ *val++ = '\0';
+ if ((val - name) < len)
+ val = fw_string_blank(val, 1);
+ else
+ val = NULL;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr, "Setting %s : %s\n",
+ name, val ? val : " removed");
+#endif
+
+ /*
+ * If there is an error setting a variable,
+ * try to save the environment and returns an error
+ */
+ if (fw_env_write(name, val)) {
+ fprintf(stderr,
+ "fw_env_write returns with error : %s\n",
+ strerror(errno));
+ ret = -1;
+ break;
+ }
+
+ }
+
+ /* Close file if not stdin */
+ if (strcmp(fname, "-") != 0)
+ fclose(fp);
+
+ ret |= fw_env_close();
+
+ return ret;
+
}
/*
@@ -880,7 +1059,7 @@
/*
* Prevent confusion if running from erased flash memory
*/
-static int env_init (void)
+int fw_env_open(void)
{
int crc0, crc0_ok;
char flag0;