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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "uconfig.h"
struct uconfig_pair_s {
char *key;
char *value;
struct uconfig_pair_s *next;
};
struct uconfig_s {
struct uconfig_pair_s *head;
struct uconfig_pair_s *tail;
};
/* Create a new Uconfig pair. KEY and VALUE are copied to create the new
* pair. */
static struct uconfig_pair_s *uconfig_pair_new(const char *key, const char *value)
{
struct uconfig_pair_s *pair = malloc(sizeof(struct uconfig_pair_s));
pair->key = strdup(key);
pair->value = strdup(value);
pair->next = NULL;
return pair;
}
static void uconfig_add_tail(struct uconfig_s *uconfig,
struct uconfig_pair_s *pair)
{
if (!uconfig->head) {
/* first pair in the config handle */
uconfig->head = pair;
uconfig->tail = pair;
}
else {
uconfig->tail->next = pair;
uconfig->tail = pair;
}
}
static int char_is_blank(int c)
{
return c == ' ' || c == '\t' || c == '\n';
}
/* Remove all the leading and trailing blank characters from STR. STR is
* modified in-place. */
static char *trim(char *str)
{
int len = strlen(str);
while ((len > 0) && char_is_blank(*str)) {
str++;
len--;
}
while ((len > 0) && char_is_blank(str[len - 1])) {
str[len - 1] = '\0';
len--;
}
if (len == 0) {
fprintf(stderr,
"%s: warning: returning empty string\n",
__func__);
}
return str;
}
static int uconfig_parse_line(struct uconfig_s *uconfig,
const char *file,
int line_number,
char *line)
{
char *sep_ptr = strchr(line, '=');
if (sep_ptr == NULL) {
fprintf(stderr,
"%s: %s:%d: no '=' character found\n",
__func__, file, line_number);
return -1;
}
*sep_ptr = '\0';
char *key = trim(line);
char *value = trim(sep_ptr + 1);
struct uconfig_pair_s *pair = uconfig_pair_new(key, value);
uconfig_add_tail(uconfig, pair);
return 0;
}
struct uconfig_s *uconfig_new(const char*file)
{
FILE *input = fopen(file, "r");
struct uconfig_s *uconfig = NULL;
ssize_t line_len;
size_t line_size = 128;
char *line = NULL;
int line_number = 1;
int rc;
if (input == NULL) {
fprintf(stderr, "%s: fopen: %s: ", __func__, file);
perror("");
goto err;
}
uconfig = calloc(1, sizeof(struct uconfig_s));
line = malloc(line_size);
while ((line_len = getline(&line, &line_size, input)) != -1) {
rc = uconfig_parse_line(uconfig, file, line_number, line);
if (rc == -1)
goto err;
line_number++;
}
if (ferror(input)) {
fprintf(stderr, "%s: getline: %s: ", __func__, file);
perror("");
goto err;
}
free(line);
fclose(input);
return uconfig;
err:
if (input)
fclose(input);
if (line)
free(line);
if (uconfig)
uconfig_destroy(uconfig);
return NULL;
}
char *uconfig_get(const struct uconfig_s *uconfig, const char *key)
{
struct uconfig_pair_s *pair = uconfig->head;
while (pair) {
if (strcmp(pair->key, key) == 0)
return pair->value;
pair = pair->next;
}
return NULL;
}
static void uconfig_destroy_pairs(struct uconfig_pair_s *pair)
{
if (pair->next)
uconfig_destroy_pairs(pair->next);
free(pair->key);
free(pair->value);
free(pair);
}
void uconfig_destroy(struct uconfig_s *uconfig)
{
uconfig_destroy_pairs(uconfig->head);
}
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