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bootstd: Add support for updating elements of the cmdline

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Add a bootflow command to update the command line more easily. This allows
changing a particular parameter rather than editing a very long strings.
It is also easier to handle with scripting.

The new 'bootflow cmdline' command allows getting and setting single
parameters.

Fix up the example output while we are here, since there are a few new
items.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2023-07-12 09:04:39 -06:00 • committed by Bin Meng
parent d07861cc7a
commit 82c0938f1d
5 changed files with 293 additions and 2 deletions
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53
boot/bootflow.c
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@ -801,3 +801,56 @@ int cmdline_set_arg(char *buf, int maxlen, const char *cmdline,
return to - buf;
}
int bootflow_cmdline_set_arg(struct bootflow *bflow, const char *set_arg,
const char *new_val, bool set_env)
{
char buf[2048];
char *cmd = NULL;
int ret;
ret = cmdline_set_arg(buf, sizeof(buf), bflow->cmdline, set_arg,
new_val, NULL);
if (ret < 0)
return ret;
ret = bootflow_cmdline_set(bflow, buf);
if (*buf) {
cmd = strdup(buf);
if (!cmd)
return -ENOMEM;
}
free(bflow->cmdline);
bflow->cmdline = cmd;
if (set_env) {
ret = env_set("bootargs", bflow->cmdline);
if (ret)
return ret;
}
return 0;
}
int cmdline_get_arg(const char *cmdline, const char *arg, int *posp)
{
int ret;
ret = cmdline_set_arg(NULL, 1, cmdline, arg, NULL, posp);
return ret;
}
int bootflow_cmdline_get_arg(struct bootflow *bflow, const char *arg,
const char **val)
{
int ret;
int pos;
ret = cmdline_get_arg(bflow->cmdline, arg, &pos);
if (ret < 0)
return ret;
*val = bflow->cmdline + pos;
return ret;
}