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cli: Support macro processing with a fixed-size buffer

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At present cli_simple_process_macros() requires that the caller provide
an output buffer that is exactly CONFIG_SYS_CBSIZE bytes in length. This
makes sense since it is designed to be used from the command line. But we
also want to use it for bootargs substitution.

Update the function to allow the caller to specify the buffer size. Also
return an error if the buffer is exhausted. The caller can ignore that if
preferred.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-11-05 10:33:47 -07:00 committed by Tom Rini
parent 488d89afb8
commit 1a62d64c7d
3 changed files with 19 additions and 8 deletions
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6
cmd/pxe_utils.c
View file

@ -322,7 +322,8 @@ static int label_localboot(struct pxe_label *label)
if (label->append) {
char bootargs[CONFIG_SYS_CBSIZE];
cli_simple_process_macros(label->append, bootargs);
cli_simple_process_macros(label->append, bootargs,
sizeof(bootargs));
env_set("bootargs", bootargs);
}
@ -430,7 +431,8 @@ static int label_boot(struct cmd_tbl *cmdtp, struct pxe_label *label)
strcat(bootargs, ip_str);
strcat(bootargs, mac_str);
cli_simple_process_macros(bootargs, finalbootargs);
cli_simple_process_macros(bootargs, finalbootargs,
sizeof(finalbootargs));
env_set("bootargs", finalbootargs);
printf("append: %s\n", finalbootargs);
}

17
common/cli_simple.c
View file

@ -60,13 +60,14 @@ int cli_simple_parse_line(char *line, char *argv[])
return nargs;
}
void cli_simple_process_macros(const char *input, char *output)
int cli_simple_process_macros(const char *input, char *output, int max_size)
{
char c, prev;
const char *varname_start = NULL;
int inputcnt = strlen(input);
int outputcnt = CONFIG_SYS_CBSIZE;
int outputcnt = max_size;
int state = 0; /* 0 = waiting for '$' */
int ret;
/* 1 = waiting for '(' or '{' */
/* 2 = waiting for ')' or '}' */
@ -157,13 +158,18 @@ void cli_simple_process_macros(const char *input, char *output)
prev = c;
}
if (outputcnt)
ret = inputcnt ? -ENOSPC : 0;
if (outputcnt) {
*output = 0;
else
} else {
*(output - 1) = 0;
ret = -ENOSPC;
}
debug_parser("[PROCESS_MACROS] OUTPUT len %zd: \"%s\"\n",
strlen(output_start), output_start);
return ret;
}
/*
@ -239,7 +245,8 @@ int cli_simple_run_command(const char *cmd, int flag)
debug_parser("token: \"%s\"\n", token);
/* find macros in this token and replace them */
cli_simple_process_macros(token, finaltoken);
cli_simple_process_macros(token, finaltoken,
sizeof(finaltoken));
/* Extract arguments */
argc = cli_simple_parse_line(finaltoken, argv);

4
include/cli.h
View file

@ -34,8 +34,10 @@ int cli_simple_run_command(const char *cmd, int flag);
*
* @param input Input string possible containing $() / ${} vars
* @param output Output string with $() / ${} vars expanded
* @param max_size Maximum size of @output (including terminator)
* @return 0 if OK, -ENOSPC if we ran out of space in @output
*/
void cli_simple_process_macros(const char *input, char *output);
int cli_simple_process_macros(const char *input, char *output, int max_size);
/**
* cli_simple_run_command_list() - Execute a list of command