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/**
* @file config.c
* @brief Simple key=value configuration file parser implementation.
*/
#include "config.h"
#include <open62541/plugin/log_stdout.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Enough for typical config files; doubles on overflow. */
#define CONFIG_INITIAL_CAPACITY 16
/* Sufficient for file paths and URIs. */
#define CONFIG_LINE_MAX 1024
/* ========================================================================
* Static Helpers
* ======================================================================== */
/**
* @brief Trims leading and trailing whitespace in place.
*
* Modifies the string by writing a NUL terminator after the last
* non-whitespace character and returns a pointer past any leading
* whitespace.
*/
static char *
_s_trim (char *s)
{
while (*s == ' ' || *s == '\t')
s++;
size_t len = strlen (s);
while (len > 0 && (s[len - 1] == ' ' || s[len - 1] == '\t'))
len--;
s[len] = '\0';
return s;
}
/**
* @brief Appends a key-value pair to the config's dynamic array.
*
* Grows the array by doubling capacity when full.
*
* @return 0 on success, -1 on allocation failure.
*/
static int
_s_config_append (config *cfg, const char *key, const char *value)
{
if (cfg->count == cfg->capacity)
{
size_t new_cap = cfg->capacity * 2;
config_entry *tmp
= realloc (cfg->entries, new_cap * sizeof (config_entry));
if (!tmp)
{
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: out of memory");
return -1;
}
cfg->entries = tmp;
cfg->capacity = new_cap;
}
cfg->entries[cfg->count].key = strdup (key);
cfg->entries[cfg->count].value = strdup (value);
if (!cfg->entries[cfg->count].key || !cfg->entries[cfg->count].value)
{
free (cfg->entries[cfg->count].key);
free (cfg->entries[cfg->count].value);
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: out of memory");
return -1;
}
cfg->count++;
return 0;
}
/* ========================================================================
* Public API
* ======================================================================== */
int
config_load (const char *path, config *cfg)
{
memset (cfg, 0, sizeof (config));
cfg->entries = malloc (CONFIG_INITIAL_CAPACITY * sizeof (config_entry));
if (!cfg->entries)
{
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: out of memory");
return -1;
}
cfg->capacity = CONFIG_INITIAL_CAPACITY;
FILE *fp = fopen (path, "r");
if (!fp)
{
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: cannot open '%s'", path);
free (cfg->entries);
memset (cfg, 0, sizeof (config));
return -1;
}
char line[CONFIG_LINE_MAX];
int line_num = 0;
while (fgets (line, sizeof (line), fp))
{
line_num++;
/* Strip trailing newline / carriage return. */
size_t len = strlen (line);
while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
line[--len] = '\0';
/* Skip blank lines and comments. */
char *trimmed = _s_trim (line);
if (*trimmed == '\0' || *trimmed == '#')
continue;
/* Find the '=' separator. */
char *eq = strchr (trimmed, '=');
if (!eq)
{
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: syntax error at %s:%d "
"(missing '=')",
path, line_num);
fclose (fp);
config_free (cfg);
return -1;
}
*eq = '\0';
char *key = _s_trim (trimmed);
char *value = _s_trim (eq + 1);
if (*key == '\0')
{
UA_LOG_ERROR (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"Config: empty key at %s:%d", path, line_num);
fclose (fp);
config_free (cfg);
return -1;
}
if (_s_config_append (cfg, key, value) != 0)
{
fclose (fp);
config_free (cfg);
return -1;
}
}
fclose (fp);
return 0;
}
const char *
config_get (const config *cfg, const char *key)
{
for (size_t i = 0; i < cfg->count; i++)
{
if (strcmp (cfg->entries[i].key, key) == 0)
return cfg->entries[i].value;
}
return NULL;
}
const char *
config_require (const config *cfg, const char *key, const char *program)
{
const char *val = config_get (cfg, key);
if (!val)
UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"%s: missing required config key '%s'", program, key);
return val;
}
int
config_require_int (const config *cfg, const char *key, const char *program)
{
const char *val = config_require (cfg, key, program);
if (!val)
return -1;
char *endptr;
long num = strtol (val, &endptr, 10);
if (*endptr != '\0')
{
UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
"%s: config key '%s' is not a valid integer: '%s'",
program, key, val);
return -1;
}
return (int)num;
}
void
config_free (config *cfg)
{
for (size_t i = 0; i < cfg->count; i++)
{
free (cfg->entries[i].key);
free (cfg->entries[i].value);
}
free (cfg->entries);
memset (cfg, 0, sizeof (config));
}
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