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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
285 lines
7.7 KiB
C
285 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* An inteface for configuring a hardware via u-boot environment.
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*
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* Copyright (c) 2009 MontaVista Software, Inc.
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*/
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#ifndef HWCONFIG_TEST
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#include <config.h>
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#include <common.h>
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#include <exports.h>
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#include <hwconfig.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#define min(a, b) (((a) < (b)) ? (a) : (b))
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#endif /* HWCONFIG_TEST */
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DECLARE_GLOBAL_DATA_PTR;
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static const char *hwconfig_parse(const char *opts, size_t maxlen,
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const char *opt, char *stopchs, char eqch,
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size_t *arglen)
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{
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size_t optlen = strlen(opt);
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char *str;
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const char *start = opts;
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const char *end;
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next:
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str = strstr(opts, opt);
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end = str + optlen;
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if (end - start > maxlen)
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return NULL;
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if (str && (str == opts || strpbrk(str - 1, stopchs) == str - 1) &&
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(strpbrk(end, stopchs) == end || *end == eqch ||
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*end == '\0')) {
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const char *arg_end;
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if (!arglen)
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return str;
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if (*end != eqch)
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return NULL;
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arg_end = strpbrk(str, stopchs);
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if (!arg_end)
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*arglen = min(maxlen, strlen(str)) - optlen - 1;
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else
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*arglen = arg_end - end - 1;
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return end + 1;
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} else if (str) {
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opts = end;
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goto next;
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}
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return NULL;
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}
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const char cpu_hwconfig[] __attribute__((weak)) = "";
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const char board_hwconfig[] __attribute__((weak)) = "";
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static const char *__hwconfig(const char *opt, size_t *arglen,
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const char *env_hwconfig)
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{
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const char *ret;
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/* if we are passed a buffer use it, otherwise try the environment */
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if (!env_hwconfig) {
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if (!(gd->flags & GD_FLG_ENV_READY)) {
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printf("WARNING: Calling __hwconfig without a buffer "
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"and before environment is ready\n");
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return NULL;
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}
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env_hwconfig = env_get("hwconfig");
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}
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if (env_hwconfig) {
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ret = hwconfig_parse(env_hwconfig, strlen(env_hwconfig),
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opt, ";", ':', arglen);
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if (ret)
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return ret;
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}
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ret = hwconfig_parse(board_hwconfig, strlen(board_hwconfig),
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opt, ";", ':', arglen);
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if (ret)
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return ret;
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return hwconfig_parse(cpu_hwconfig, strlen(cpu_hwconfig),
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opt, ";", ':', arglen);
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}
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/*
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* hwconfig_f - query if a particular hwconfig option is specified
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* @opt: a string representing an option
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call can be used to find out whether U-Boot should configure
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* a particular hardware option.
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*
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* Returns non-zero value if the hardware option can be used and thus
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* should be configured, 0 otherwise.
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*
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* This function also returns non-zero value if CONFIG_HWCONFIG is
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* undefined.
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*
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* Returning non-zero value without CONFIG_HWCONFIG has its crucial
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* purpose: the hwconfig() call should be a "transparent" interface,
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* e.g. if a board doesn't need hwconfig facility, then we assume
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* that the board file only calls things that are actually used, so
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* hwconfig() will always return true result.
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*/
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int hwconfig_f(const char *opt, char *buf)
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{
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return !!__hwconfig(opt, NULL, buf);
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}
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/*
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* hwconfig_arg_f - get hwconfig option's argument
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* @opt: a string representing an option
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* @arglen: a pointer to an allocated size_t variable
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* Unlike hwconfig_f() function, this function returns a pointer to the
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* start of the hwconfig arguments, if option is not found or it has
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* no specified arguments, the function returns NULL pointer.
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*
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* If CONFIG_HWCONFIG is undefined, the function returns "", and
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* arglen is set to 0.
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*/
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const char *hwconfig_arg_f(const char *opt, size_t *arglen, char *buf)
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{
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return __hwconfig(opt, arglen, buf);
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}
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/*
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* hwconfig_arg_cmp_f - compare hwconfig option's argument
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* @opt: a string representing an option
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* @arg: a string for comparing an option's argument
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_f, but instead of returning
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* hwconfig argument and its length, it is comparing it to @arg.
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*
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* Returns non-zero value if @arg matches, 0 otherwise.
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*
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* If CONFIG_HWCONFIG is undefined, the function returns a non-zero
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* value, i.e. the argument matches.
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*/
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int hwconfig_arg_cmp_f(const char *opt, const char *arg, char *buf)
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{
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const char *argstr;
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size_t arglen;
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argstr = hwconfig_arg_f(opt, &arglen, buf);
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if (!argstr || arglen != strlen(arg))
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return 0;
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return !strncmp(argstr, arg, arglen);
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}
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/*
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* hwconfig_sub_f - query if a particular hwconfig sub-option is specified
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_f(), except that it takes additional
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* argument @subopt. In this example:
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* "dr_usb:mode=peripheral"
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* "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its
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* argument.
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*/
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int hwconfig_sub_f(const char *opt, const char *subopt, char *buf)
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{
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size_t arglen;
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const char *arg;
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arg = __hwconfig(opt, &arglen, buf);
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if (!arg)
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return 0;
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return !!hwconfig_parse(arg, arglen, subopt, ",;", '=', NULL);
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}
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/*
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* hwconfig_subarg_f - get hwconfig sub-option's argument
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @subarglen: a pointer to an allocated size_t variable
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_f(), except that it takes an
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* additional argument @subopt, and so works with sub-options.
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*/
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const char *hwconfig_subarg_f(const char *opt, const char *subopt,
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size_t *subarglen, char *buf)
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{
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size_t arglen;
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const char *arg;
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arg = __hwconfig(opt, &arglen, buf);
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if (!arg)
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return NULL;
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return hwconfig_parse(arg, arglen, subopt, ",;", '=', subarglen);
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}
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/*
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* hwconfig_arg_cmp_f - compare hwconfig sub-option's argument
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @subarg: a string for comparing an sub-option's argument
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_cmp_f, except that it takes an
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* additional argument @subopt, and so works with sub-options.
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*/
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int hwconfig_subarg_cmp_f(const char *opt, const char *subopt,
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const char *subarg, char *buf)
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{
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const char *argstr;
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size_t arglen;
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argstr = hwconfig_subarg_f(opt, subopt, &arglen, buf);
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if (!argstr || arglen != strlen(subarg))
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return 0;
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return !strncmp(argstr, subarg, arglen);
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}
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#ifdef HWCONFIG_TEST
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int main()
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{
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const char *ret;
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size_t len;
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env_set("hwconfig", "key1:subkey1=value1,subkey2=value2;key2:value3;;;;"
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"key3;:,:=;key4", 1);
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ret = hwconfig_arg("key1", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 29);
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assert(hwconfig_arg_cmp("key1", "subkey1=value1,subkey2=value2"));
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assert(!strncmp(ret, "subkey1=value1,subkey2=value2", len));
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ret = hwconfig_subarg("key1", "subkey1", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_subarg_cmp("key1", "subkey1", "value1"));
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assert(!strncmp(ret, "value1", len));
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ret = hwconfig_subarg("key1", "subkey2", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_subarg_cmp("key1", "subkey2", "value2"));
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assert(!strncmp(ret, "value2", len));
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ret = hwconfig_arg("key2", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_arg_cmp("key2", "value3"));
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assert(!strncmp(ret, "value3", len));
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assert(hwconfig("key3"));
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assert(hwconfig_arg("key4", &len) == NULL);
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assert(hwconfig_arg("bogus", &len) == NULL);
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unenv_set("hwconfig");
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assert(hwconfig(NULL) == 0);
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assert(hwconfig("") == 0);
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assert(hwconfig("key3") == 0);
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return 0;
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}
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#endif /* HWCONFIG_TEST */
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