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env: add env_delete() 

Change-Id: I3a94942b1670e641c8558c64dabca0155e53e2ea
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
This commit is contained in:
Joseph Chen 2018-01-31 15:39:31 +08:00 committed by Kever Yang
parent 736ece61eb
commit 3c9ee70130
2 changed files with 40 additions and 0 deletions
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31
cmd/nvedit.c
View File

@ -533,6 +533,37 @@ int env_exist(const char *varname, const char *varvalue)
return ret;
}
int env_delete(const char *varname, const char *varvalue)
{
const char *str;
char *value, *start;
/* before import into hashtable */
if (!(gd->flags & GD_FLG_ENV_READY) || !varname)
return 1;
value = env_get(varname);
if (value) {
start = strstr(value, varvalue);
if (start) {
/* varvalue is not the last property */
str = strstr(start, " ");
if (str) {
/* Terminate, so cmdline can be dest for strcat() */
*start = '\0';
/* +1 to skip white space */
strcat((char *)value, (str + 1));
/* varvalue is the last property */
} else {
/* skip white space */
*(start - 1) = '\0';
}
}
}
return 0;
}
/**
* Set an environment variable to an integer value
*

9
include/common.h
View File

@ -349,6 +349,15 @@ int env_update(const char *varname, const char *varvalue);
*/
int env_exist(const char *varname, const char *varvalue);
/**
* env_delete() - delete sub value of an environment variable
*
* @varname: Variable to look up
* @value: Item head of value to delete
* @return 0 if ok, 1 on error
*/
int env_delete(const char *varname, const char *varvalue);
/**
* env_set_ulong() - set an environment variable to an integer
*