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authorSimon Glass <sjg@chromium.org>2011-10-14 13:25:18 +0000
committerWolfgang Denk <wd@denx.de>2011-10-23 23:32:45 +0200
commit4a9b413108f4bd274973398356b45c0346238bc9 (patch)
treedae25295771bffb5d81b5bfb84d3dba5d1cd7e94
parent3668d8fa0417a3082aa57dd5e0db8fbe887c31e0 (diff)
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Add getenv_ulong() to read an integer from an environment variable
This is not an uncommon operation in U-Boot, so let's put it in a common function. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--common/cmd_nvedit.c20
-rw-r--r--include/common.h1
2 files changed, 21 insertions, 0 deletions
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 101bc49..fa99c44 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -540,6 +540,26 @@ int getenv_f(const char *name, char *buf, unsigned len)
return -1;
}
+/**
+ * Decode the integer value of an environment variable and return it.
+ *
+ * @param name Name of environemnt variable
+ * @param base Number base to use (normally 10, or 16 for hex)
+ * @param default_val Default value to return if the variable is not
+ * found
+ * @return the decoded value, or default_val if not found
+ */
+ulong getenv_ulong(const char *name, int base, ulong default_val)
+{
+ /*
+ * We can use getenv() here, even before relocation, since the
+ * environment variable value is an integer and thus short.
+ */
+ const char *str = getenv(name);
+
+ return str ? simple_strtoul(str, NULL, base) : default_val;
+}
+
#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
diff --git a/include/common.h b/include/common.h
index db1c7d0..a1683a2 100644
--- a/include/common.h
+++ b/include/common.h
@@ -297,6 +297,7 @@ void env_relocate (void);
int envmatch (uchar *, int);
char *getenv (const char *);
int getenv_f (const char *name, char *buf, unsigned len);
+ulong getenv_ulong(const char *name, int base, ulong default_val);
int saveenv (void);
#ifdef CONFIG_PPC /* ARM version to be fixed! */
int inline setenv (const char *, const char *);