#include <linux/linux_string.h>
#else
#include <common.h>
+#include <slre.h>
#endif
#include <env_attr.h>
* list = entry[,list]
*/
int env_attr_walk(const char *attr_list,
- int (*callback)(const char *name, const char *attributes))
+ int (*callback)(const char *name, const char *attributes, void *priv),
+ void *priv)
{
const char *entry, *entry_end;
char *name, *attributes;
if (strlen(name) != 0) {
int retval = 0;
- retval = callback(name, attributes);
+ retval = callback(name, attributes, priv);
if (retval) {
free(entry_cpy);
return retval;
return 0;
}
-/*
- * Search for the last matching string in another string with the option to
- * start looking at a certain point (i.e. ignore anything beyond that point).
- */
-static char *reverse_strstr(const char *searched, const char *search_for,
- const char *searched_start)
+#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)
{
- char *result = NULL;
+ int retval = 0;
+ struct regex_callback_priv *cbp = (struct regex_callback_priv *)priv;
+ struct slre slre;
+ char regex[strlen(name) + 3];
- if (*search_for == '\0')
- return (char *)searched;
+ /* 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];
- for (;;) {
- char *match = strstr(searched, search_for);
-
- /*
- * Stop looking if no new match is found or looking past the
- * searched_start pointer
- */
- if (match == NULL || (searched_start != NULL &&
- match + strlen(search_for) > searched_start))
- break;
+ if (slre_match(&slre, cbp->searched_for,
+ strlen(cbp->searched_for), caps)) {
+ free(cbp->regex);
+ cbp->regex = malloc(strlen(regex) + 1);
+ if (cbp->regex) {
+ strcpy(cbp->regex, regex);
+ } else {
+ retval = -ENOMEM;
+ goto done;
+ }
- result = match;
- searched = match + 1;
+ 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;
}
-
- return result;
+done:
+ return retval;
}
/*
*/
int env_attr_lookup(const char *attr_list, const char *name, char *attributes)
{
- const char *entry = NULL;
-
if (!attributes)
/* bad parameter */
- return -1;
+ return -EINVAL;
if (!attr_list)
/* list not found */
- return 1;
+ return -EINVAL;
+
+ struct regex_callback_priv priv;
+ int retval;
- entry = reverse_strstr(attr_list, name, NULL);
- while (entry != NULL) {
- const char *prevch = entry - 1;
- const char *nextch = entry + strlen(name);
+ 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 == ' ')
+ while (*prevch == ' ' && prevch >= searched)
prevch--;
while (*nextch == ' ')
nextch++;
- /* check for an exact match */
- if ((entry == attr_list ||
- *prevch == ENV_ATTR_LIST_DELIM) &&
- (*nextch == ENV_ATTR_SEP ||
- *nextch == ENV_ATTR_LIST_DELIM ||
- *nextch == '\0'))
- break;
+ /* 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;
- entry = reverse_strstr(attr_list, name, entry);
+ 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 += strlen(name);
+ entry += entry_len;
/* skip spaces */
while (*entry == ' ')
entry++;
}
/* not found in list */
- return 2;
+ return -ENOENT;
}
+#endif
projects / karo-tx-uboot.git / blobdiff