u-boot/env/attr.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
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>
2018-05-07 09:34:12 -04:00

309 lines
6.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012
* Joe Hershberger, National Instruments, joe.hershberger@ni.com
*/
#ifdef USE_HOSTCC /* Eliminate "ANSI does not permit..." warnings */
#include <stdint.h>
#include <stdio.h>
#include <linux/linux_string.h>
#else
#include <common.h>
#include <slre.h>
#endif
#include <env_attr.h>
#include <errno.h>
#include <linux/string.h>
#include <malloc.h>
/*
* Iterate through the whole list calling the callback for each found element.
* "attr_list" takes the form:
* attributes = [^,:\s]*
* entry = name[:attributes]
* list = entry[,list]
*/
int env_attr_walk(const char *attr_list,
int (*callback)(const char *name, const char *attributes, void *priv),
void *priv)
{
const char *entry, *entry_end;
char *name, *attributes;
if (!attr_list)
/* list not found */
return 1;
entry = attr_list;
do {
char *entry_cpy = NULL;
entry_end = strchr(entry, ENV_ATTR_LIST_DELIM);
/* check if this is the last entry in the list */
if (entry_end == NULL) {
int entry_len = strlen(entry);
if (entry_len) {
/*
* allocate memory to copy the entry into since
* we will need to inject '\0' chars and squash
* white-space before calling the callback
*/
entry_cpy = malloc(entry_len + 1);
if (entry_cpy)
/* copy the rest of the list */
strcpy(entry_cpy, entry);
else
return -ENOMEM;
}
} else {
int entry_len = entry_end - entry;
if (entry_len) {
/*
* allocate memory to copy the entry into since
* we will need to inject '\0' chars and squash
* white-space before calling the callback
*/
entry_cpy = malloc(entry_len + 1);
if (entry_cpy) {
/* copy just this entry and null term */
strncpy(entry_cpy, entry, entry_len);
entry_cpy[entry_len] = '\0';
} else
return -ENOMEM;
}
}
/* check if there is anything to process (e.g. not ",,,") */
if (entry_cpy != NULL) {
attributes = strchr(entry_cpy, ENV_ATTR_SEP);
/* check if there is a ':' */
if (attributes != NULL) {
/* replace the ':' with '\0' to term name */
*attributes++ = '\0';
/* remove white-space from attributes */
attributes = strim(attributes);
}
/* remove white-space from name */
name = strim(entry_cpy);
/* only call the callback if there is a name */
if (strlen(name) != 0) {
int retval = 0;
retval = callback(name, attributes, priv);
if (retval) {
free(entry_cpy);
return retval;
}
}
}
free(entry_cpy);
entry = entry_end + 1;
} while (entry_end != NULL);
return 0;
}
#if defined(CONFIG_REGEX)
struct regex_callback_priv {
const char *searched_for;
char *regex;
char *attributes;
};
static int regex_callback(const char *name, const char *attributes, void *priv)
{
int retval = 0;
struct regex_callback_priv *cbp = (struct regex_callback_priv *)priv;
struct slre slre;
char regex[strlen(name) + 3];
/* Require the whole string to be described by the regex */
sprintf(regex, "^%s$", name);
if (slre_compile(&slre, regex)) {
struct cap caps[slre.num_caps + 2];
if (slre_match(&slre, cbp->searched_for,
strlen(cbp->searched_for), caps)) {
free(cbp->regex);
if (!attributes) {
retval = -EINVAL;
goto done;
}
cbp->regex = malloc(strlen(regex) + 1);
if (cbp->regex) {
strcpy(cbp->regex, regex);
} else {
retval = -ENOMEM;
goto done;
}
free(cbp->attributes);
cbp->attributes = malloc(strlen(attributes) + 1);
if (cbp->attributes) {
strcpy(cbp->attributes, attributes);
} else {
retval = -ENOMEM;
free(cbp->regex);
cbp->regex = NULL;
goto done;
}
}
} else {
printf("Error compiling regex: %s\n", slre.err_str);
retval = -EINVAL;
}
done:
return retval;
}
/*
* Retrieve the attributes string associated with a single name in the list
* There is no protection on attributes being too small for the value
*/
int env_attr_lookup(const char *attr_list, const char *name, char *attributes)
{
if (!attributes)
/* bad parameter */
return -EINVAL;
if (!attr_list)
/* list not found */
return -EINVAL;
struct regex_callback_priv priv;
int retval;
priv.searched_for = name;
priv.regex = NULL;
priv.attributes = NULL;
retval = env_attr_walk(attr_list, regex_callback, &priv);
if (retval)
return retval; /* error */
if (priv.regex) {
strcpy(attributes, priv.attributes);
free(priv.attributes);
free(priv.regex);
/* success */
return 0;
}
return -ENOENT; /* not found in list */
}
#else
/*
* Search for the last exactly matching name in an attribute list
*/
static int reverse_name_search(const char *searched, const char *search_for,
const char **result)
{
int result_size = 0;
const char *cur_searched = searched;
if (result)
*result = NULL;
if (*search_for == '\0') {
if (result)
*result = searched;
return strlen(searched);
}
for (;;) {
const char *match = strstr(cur_searched, search_for);
const char *prevch;
const char *nextch;
/* Stop looking if no new match is found */
if (match == NULL)
break;
prevch = match - 1;
nextch = match + strlen(search_for);
/* Skip spaces */
while (*prevch == ' ' && prevch >= searched)
prevch--;
while (*nextch == ' ')
nextch++;
/* Start looking past the current match so last is found */
cur_searched = match + 1;
/* Check for an exact match */
if (match != searched &&
*prevch != ENV_ATTR_LIST_DELIM &&
prevch != searched - 1)
continue;
if (*nextch != ENV_ATTR_SEP &&
*nextch != ENV_ATTR_LIST_DELIM &&
*nextch != '\0')
continue;
if (result)
*result = match;
result_size = strlen(search_for);
}
return result_size;
}
/*
* Retrieve the attributes string associated with a single name in the list
* There is no protection on attributes being too small for the value
*/
int env_attr_lookup(const char *attr_list, const char *name, char *attributes)
{
const char *entry = NULL;
int entry_len;
if (!attributes)
/* bad parameter */
return -EINVAL;
if (!attr_list)
/* list not found */
return -EINVAL;
entry_len = reverse_name_search(attr_list, name, &entry);
if (entry != NULL) {
int len;
/* skip the name */
entry += entry_len;
/* skip spaces */
while (*entry == ' ')
entry++;
if (*entry != ENV_ATTR_SEP)
len = 0;
else {
const char *delim;
static const char delims[] = {
ENV_ATTR_LIST_DELIM, ' ', '\0'};
/* skip the attr sep */
entry += 1;
/* skip spaces */
while (*entry == ' ')
entry++;
delim = strpbrk(entry, delims);
if (delim == NULL)
len = strlen(entry);
else
len = delim - entry;
memcpy(attributes, entry, len);
}
attributes[len] = '\0';
/* success */
return 0;
}
/* not found in list */
return -ENOENT;
}
#endif