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#define _POSIX_C_SOURCE 200809L
#include "libweb/form.h"
#include "libweb/http.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct pair
{
char *key, *value;
};
struct form
{
struct pair *pairs;
size_t n;
};
void form_free(struct form *const f)
{
if (!f)
return;
for (size_t i = 0; i < f->n; i++)
{
struct pair *const p = &f->pairs[i];
free(p->key);
free(p->value);
}
free(f->pairs);
free(f);
}
const char *form_value(const struct form *const f, const char *const key)
{
for (size_t i = 0; i < f->n; i++)
{
const struct pair *const p = &f->pairs[i];
if (!strcmp(p->key, key))
return p->value;
}
return NULL;
}
static char *alloc_form_data(const char *const s, const char **const end)
{
const char *const next = strchr(s, '&');
char *const data = next ? strndup(s, next - s) : strdup(s);
if (!data)
{
fprintf(stderr, "%s: strndup/strdup(3): %s\n", __func__,
strerror(errno));
return NULL;
}
*end = next ? next + 1 : s + strlen(s);
return data;
}
static int append(struct form *const forms, const char **const s)
{
int ret = -1;
const char *end;
char *const data = alloc_form_data(*s, &end), *enckey = NULL,
*encvalue = NULL, *key = NULL, *value = NULL;
struct pair *p;
if (!data)
{
fprintf(stderr, "%s: alloc_form_data failed\n", __func__);
goto end;
}
const char *const sep = strchr(data, '=');
if (!sep)
{
ret = 1;
goto end;
}
else if (!data || !*(sep + 1))
{
ret = 1;
goto end;
}
const size_t keylen = sep - data;
if (!(enckey = strndup(data, keylen)))
{
fprintf(stderr, "%s: strndup(3) enckey: %s\n",
__func__, strerror(errno));
goto end;
}
else if (!(encvalue = strdup(sep + 1)))
{
fprintf(stderr, "%s: strdup(3) encvalue: %s\n",
__func__, strerror(errno));
goto end;
}
/* HTML input forms use '+' for whitespace, rather than %20. */
else if ((ret = http_decode_url(enckey, true, &key)))
{
fprintf(stderr, "%s: http_decode_url enckey failed\n", __func__);
goto end;
}
else if ((ret = http_decode_url(encvalue, true, &value)))
{
fprintf(stderr, "%s: http_decode_url encvalue failed\n", __func__);
goto end;
}
else if (!(p = realloc(forms->pairs, (forms->n + 1) * sizeof *p)))
{
fprintf(stderr, "%s: realloc(3): %s\n", __func__, strerror(errno));
goto end;
}
forms->pairs = p;
p[forms->n++] = (const struct pair)
{
.key = key,
.value = value
};
*s = end;
ret = 0;
end:
if (ret)
{
free(key);
free(value);
}
free(enckey);
free(encvalue);
free(data);
return ret;
}
int form_foreach(const struct form *const f, const form_iter it,
void *const user)
{
for (size_t i = 0; i < f->n; i++)
{
const struct pair *const p = &f->pairs[i];
const int ret = it(p->key, p->value, user);
if (ret)
return ret;
}
return 0;
}
int form_alloc(const char *data, struct form **const out)
{
int ret = -1;
struct form *const f = malloc(sizeof *f);
if (!f)
{
fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
goto failure;
}
*f = (const struct form){0};
while (*data)
if ((ret = append(f, &data)))
{
if (ret < 0)
fprintf(stderr, "%s: append_form failed\n", __func__);
goto failure;
}
*out = f;
return 0;
failure:
free(f);
return ret;
}
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