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#include <stdlib.h>
#include <string.h>
#include "xml.h"
static char *get_tag(char *xml, unsigned long *pos);
static attr_t *get_attrs(char *parsed, char **tag, int *n_attrs);
static int check_closing_tag(char *xml, unsigned long *pos, char *tag, int *err);
static void set_tag(char *xml, map_t **map, int *closed, unsigned long *pos);
static void set_value(char *xml, unsigned long *pos, map_t **map);
static map_t *decode_helper(char *xml, unsigned long *pos, int *len);
map_t *decode(char *xml) {
int len = 0;
unsigned long start = 0;
return decode_helper(xml, &start, &len);
}
static map_t *decode_helper(char *xml, unsigned long *pos, int *len) {
if (*len)
++(*len);
else
*len = 1;
map_t *decoded = calloc(1, sizeof(map_t));
int err = 0, closed = 1;
for (unsigned long i = *pos; i < strlen(xml); ++i) {
if (check_closing_tag(xml, &i, decoded->tag, &err)) {
if (!err)
*pos = i;
break;
} else if (xml[i] == '<' && closed)
set_tag(xml, &decoded, &closed, &i);
else if (xml[i] == '<' && !closed) {
map_t *ndec = decode_helper(xml, &i, &(decoded->n));
decoded->size = sizeof(map_t);
if (decoded->n > 1)
decoded->payload =
realloc(decoded->payload, decoded->n * sizeof(map_t));
else
decoded->payload = calloc(1, sizeof(map_t));
((map_t *)decoded->payload)[decoded->n - 1] = *ndec;
free(ndec);
} else
set_value(xml, &i, &decoded);
}
if (err) {
free(decoded);
decoded = NULL;
}
return decoded;
}
static char *get_tag(char *xml, unsigned long *pos) {
int len;
unsigned long i;
for (i = *pos, len = 0; xml[i] != '>' && i < strlen(xml); ++i, ++len)
;
if (i >= strlen(xml))
return NULL;
char *title = calloc(len + 1, sizeof(char));
strncpy(title, xml + *pos, len);
*pos += len;
return title;
}
static void set_value(char *xml, unsigned long *pos, map_t **map) {
int len;
unsigned long i;
for (i = *pos, len = 0; xml[i] != '<' && i < strlen(xml); ++i, ++len)
;
if (i >= strlen(xml))
return;
(*map)->payload = calloc(len + 1, sizeof(char));
strncpy((*map)->payload, xml + *pos, len);
(*map)->size = sizeof(char);
(*map)->n = strlen((*map)->payload);
*pos += len - 1;
}
static attr_t *get_attrs(char *parsed, char **tag, int *n_attrs) {
attr_t *attrs;
char *iter = strtok(parsed, " ");
*tag = calloc(strlen(iter) + 1, sizeof(char));
strcpy(*tag, iter);
if ((iter = strtok(NULL, " ")))
attrs = calloc((*n_attrs = 1), sizeof(attr_t));
else {
free(parsed);
return NULL;
}
int pos = 0;
do {
if (!iter)
break;
int i, len = strlen(iter);
for (i = 0; i < len && iter[i] != '='; ++i)
;
if (i >= len || (iter[i] == '=' && i >= len - 1) ||
(iter[i + 1] != '\'' && iter[i + 1] != '"')) {
free(parsed);
free(attrs);
return NULL;
}
char *name = calloc(i + 1, sizeof(char));
char *value = calloc(len - i, sizeof(char));
strncpy(name, iter, i);
strcpy(value, iter + i + 1);
memmove(value, value + 1, strlen(value) - 1);
value[strlen(value) - 2] = '\0';
if (pos >= *n_attrs)
attrs = realloc(attrs, (*n_attrs *= 2) * sizeof(attr_t));
attrs[pos].id = name;
attrs[pos++].value = value;
} while ((iter = strtok(NULL, " ")));
*n_attrs = pos;
free(parsed);
return attrs;
}
static void set_tag(char *xml, map_t **map, int *closed, unsigned long *pos) {
(*pos)++;
(*map)->attrs =
get_attrs(get_tag(xml, pos), &((*map)->tag), &((*map)->n_attrs));
*closed = 0;
}
static int check_closing_tag(char *xml, unsigned long *pos, char *tag, int *err) {
if (!strncmp(xml + *pos, "</", 2)) {
*pos += 2;
char *tmp = get_tag(xml, pos);
if (strcmp(tag, tmp))
*err = 1;
free(tmp);
return 1;
}
return 0;
}
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