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/* This file is part of GNU Dico
Copyright (C) 2008-2024 Sergey Poznyakoff
GNU Dico is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Dico is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <dico.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
struct hdr_buf
{
char *base;
size_t size;
size_t level;
};
#define HDR_BUF_SIZE 128
#define HDR_BUF_INIT { NULL, 0, 0 }
#define ISWS(c) ((c) == ' ' || (c) == '\t')
static int
hdr_buf_append(struct hdr_buf *buf, const char *str, size_t len)
{
if (len == 0)
return 0;
if (buf->size == 0) {
size_t size = HDR_BUF_SIZE * ((len + HDR_BUF_SIZE - 1) / HDR_BUF_SIZE);
buf->base = malloc(size);
if (!buf->base)
return 1;
buf->size = size;
} else if (buf->level + len > buf->size) {
char *p;
size_t diff = buf->level + len - buf->size;
size_t size = buf->size * ((diff + buf->size - 1) / buf->size + 1);
if (size < buf->size) {
errno = ENOMEM;
return 1;
}
p = realloc(buf->base, size);
if (!p)
return 1;
buf->base = p;
buf->size = size;
}
memcpy(buf->base + buf->level, str, len);
buf->level += len;
return 0;
}
#define hdr_buf_clear(b) do { (b)->level = 0; } while (0)
#define hdr_buf_free(b) do { free((b)->base); } while (0)
static int
collect_line(const char **ptext, dico_assoc_list_t asc, struct hdr_buf *hbuf)
{
const char *text = *ptext;
char c, *p;
size_t n;
hdr_buf_clear(hbuf);
do {
if (ISWS(*text)) {
while (*text && ISWS(*text))
text++;
text--;
}
n = strcspn(text, "\n");
if (n == 0) {
text += strlen(text);
break;
}
if (hdr_buf_append(hbuf, text, n))
return 1;
text += n;
if (!*text)
break;
text++;
} while (ISWS(*text));
c = 0;
if (hdr_buf_append(hbuf, &c, 1))
return 1;
p = strchr(hbuf->base, ':');
if (!p) {
errno = EINVAL;
return 1;
}
*p++ = 0;
while (*p && ISWS(*p))
p++;
if (dico_assoc_append(asc, hbuf->base, p))
return 1;
*ptext = text;
return 0;
}
int
dico_header_parse(dico_assoc_list_t *pasc, const char *text)
{
int rc = 0;
struct hdr_buf hbuf = HDR_BUF_INIT;
dico_assoc_list_t asc = dico_assoc_create(DICO_ASSOC_CI|DICO_ASSOC_MULT);
if (!asc)
return 1;
if (text) {
while (*text && *text != '\n'
&& (rc = collect_line(&text, asc, &hbuf)) == 0)
;
hdr_buf_free(&hbuf);
}
if (rc) {
int ec = errno;
dico_assoc_destroy(&asc);
errno = ec;
} else
*pasc = asc;
return rc;
}
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