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jshn: use an avl tree for env variables to speed up processing of bigger json files

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
This commit is contained in:
Felix Fietkau 2016-03-05 18:51:31 +01:00
parent 5326ce1046
commit dfe446e2a9
1 changed files with 57 additions and 4 deletions
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61
jshn.c
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@ -27,11 +27,13 @@
#include <getopt.h>
#include "list.h"
#include "avl.h"
#include "blob.h"
#include "blobmsg_json.h"
#define MAX_VARLEN 256
static struct avl_tree env_vars;
static struct blob_buf b = { 0 };
static const char *var_prefix = "";
@ -39,6 +41,11 @@ static int var_prefix_len = 0;
static int add_json_element(const char *key, json_object *obj);
struct env_var {
struct avl_node avl;
char *val;
};
static int add_json_object(json_object *obj)
{
int ret = 0;
@ -175,13 +182,19 @@ static int jshn_parse(const char *str)
return 0;
}
static char *getenv_avl(const char *key)
{
struct env_var *var = avl_find_element(&env_vars, key, var, avl);
return var ? var->val : NULL;
}
static char *get_keys(const char *prefix)
{
char *keys;
keys = alloca(var_prefix_len + strlen(prefix) + sizeof("K_") + 1);
sprintf(keys, "%sK_%s", var_prefix, prefix);
return getenv(keys);
return getenv_avl(keys);
}
static void get_var(const char *prefix, const char **name, char **var, char **type)
@ -191,13 +204,13 @@ static void get_var(const char *prefix, const char **name, char **var, char **ty
tmpname = alloca(var_prefix_len + strlen(prefix) + 1 + strlen(*name) + 1 + sizeof("T_"));
sprintf(tmpname, "%s%s_%s", var_prefix, prefix, *name);
*var = getenv(tmpname);
*var = getenv_avl(tmpname);
sprintf(tmpname, "%sT_%s_%s", var_prefix, prefix, *name);
*type = getenv(tmpname);
*type = getenv_avl(tmpname);
sprintf(tmpname, "%sN_%s_%s", var_prefix, prefix, *name);
varname = getenv(tmpname);
varname = getenv_avl(tmpname);
if (varname)
*name = varname;
}
@ -291,12 +304,52 @@ static int usage(const char *progname)
return 2;
}
static int avl_strcmp_var(const void *k1, const void *k2, void *ptr)
{
const char *s1 = k1;
const char *s2 = k2;
char c1, c2;
while (*s1 && *s1 == *s2) {
s1++;
s2++;
}
c1 = *s1;
c2 = *s2;
if (c1 == '=')
c1 = 0;
if (c2 == '=')
c2 = 0;
return c1 - c2;
}
int main(int argc, char **argv)
{
extern char **environ;
bool no_newline = false;
bool indent = false;
struct env_var *vars;
int i;
int ch;
avl_init(&env_vars, avl_strcmp_var, false, NULL);
for (i = 0; environ[i]; i++);
vars = calloc(i, sizeof(*vars));
for (i = 0; environ[i]; i++) {
char *c;
vars[i].avl.key = environ[i];
c = strchr(environ[i], '=');
if (!c)
continue;
vars[i].val = c + 1;
avl_insert(&env_vars, &vars[i].avl);
}
while ((ch = getopt(argc, argv, "p:nir:w")) != -1) {
switch(ch) {
case 'p':