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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Written by Karel Zak <kzak@redhat.com>
*/
#include "buffer.h"
#include "mbsalign.h"
void ul_buffer_reset_data(struct ul_buffer *buf)
{
if (buf->begin)
buf->begin[0] = '\0';
buf->end = buf->begin;
if (buf->ptrs && buf->nptrs)
memset(buf->ptrs, 0, buf->nptrs * sizeof(char *));
}
void ul_buffer_free_data(struct ul_buffer *buf)
{
assert(buf);
free(buf->begin);
buf->begin = NULL;
buf->end = NULL;
buf->sz = 0;
free(buf->ptrs);
buf->ptrs = NULL;
buf->nptrs = 0;
free(buf->encoded);
buf->encoded = NULL;
buf->encoded_sz = 0;
}
void ul_buffer_set_chunksize(struct ul_buffer *buf, size_t sz)
{
buf->chunksize = sz;
}
int ul_buffer_is_empty(struct ul_buffer *buf)
{
return buf->begin == buf->end;
}
int ul_buffer_save_pointer(struct ul_buffer *buf, unsigned short ptr_idx)
{
if (ptr_idx >= buf->nptrs) {
char **tmp = realloc(buf->ptrs, (ptr_idx + 1) * sizeof(char *));
if (!tmp)
return -EINVAL;
buf->ptrs = tmp;
buf->nptrs = ptr_idx + 1;
}
buf->ptrs[ptr_idx] = buf->end;
return 0;
}
char *ul_buffer_get_pointer(struct ul_buffer *buf, unsigned short ptr_idx)
{
if (ptr_idx < buf->nptrs)
return buf->ptrs[ptr_idx];
return NULL;
}
/* returns length from begin to the pointer */
size_t ul_buffer_get_pointer_length(struct ul_buffer *buf, unsigned short ptr_idx)
{
char *ptr = ul_buffer_get_pointer(buf, ptr_idx);
if (ptr && ptr > buf->begin)
return ptr - buf->begin;
return 0;
}
/* returns width of data in safe encoding (from the begin to the pointer) */
size_t ul_buffer_get_safe_pointer_width(struct ul_buffer *buf, unsigned short ptr_idx)
{
size_t len = ul_buffer_get_pointer_length(buf, ptr_idx);
if (!len)
return 0;
return mbs_safe_nwidth(buf->begin, len, NULL);
}
void ul_buffer_refer_string(struct ul_buffer *buf, char *str)
{
if (buf->sz)
ul_buffer_free_data(buf);
buf->begin = str;
buf->sz = str ? strlen(str) : 0;
buf->end = buf->begin ? buf->begin + buf->sz : buf->begin;
}
int ul_buffer_alloc_data(struct ul_buffer *buf, size_t sz)
{
char *tmp;
size_t len = 0;
assert(buf);
if (sz <= buf->sz)
return 0;
if (buf->end && buf->begin)
len = buf->end - buf->begin;
if (buf->chunksize)
sz = ((sz + buf->chunksize) / buf->chunksize) * buf->chunksize + 1;
tmp = realloc(buf->begin, sz);
if (!tmp)
return -ENOMEM;
buf->begin = tmp;
buf->end = buf->begin + len;
buf->sz = sz;
memset(buf->end, '\0', sz - len);
return 0;
}
int ul_buffer_append_data(struct ul_buffer *buf, const char *data, size_t sz)
{
size_t maxsz = 0;
if (!buf)
return -EINVAL;
if (!data || !*data)
return 0;
if (buf->begin && buf->end)
maxsz = buf->sz - (buf->end - buf->begin);
if (maxsz <= sz + 1) {
int rc = ul_buffer_alloc_data(buf, buf->sz + sz + 1);
if (rc)
return rc;
}
if (!buf->end)
return -EINVAL; /* make static analyzers happy */
memcpy(buf->end, data, sz);
buf->end += sz;
*buf->end = '\0'; /* make sure it's terminated */
return 0;
}
int ul_buffer_append_string(struct ul_buffer *buf, const char *str)
{
if (!str)
return 0;
return ul_buffer_append_data(buf, str, strlen(str));
}
int ul_buffer_append_ntimes(struct ul_buffer *buf, size_t n, const char *str)
{
size_t i;
size_t len = strlen(str);
for (i = 0; len && i < n; i++) {
int rc = ul_buffer_append_data(buf, str, len);
if (rc)
return rc;
}
return 0;
}
int ul_buffer_set_data(struct ul_buffer *buf, const char *data, size_t sz)
{
ul_buffer_reset_data(buf);
return ul_buffer_append_data(buf, data, sz);
}
char *ul_buffer_get_data(struct ul_buffer *buf, size_t *sz, size_t *width)
{
if (sz)
*sz = buf->end - buf->begin;
if (width)
*width = buf->begin && *buf->begin ? mbs_width(buf->begin) : 0;
return buf->begin;
}
/* size of allocated area (!= size of stored data */
size_t ul_buffer_get_bufsiz(struct ul_buffer *buf)
{
return buf->sz;
}
/* encode data by mbs_safe_encode() to avoid control and non-printable chars */
char *ul_buffer_get_safe_data(struct ul_buffer *buf, size_t *sz, size_t *width, const char *safechars)
{
char *data = ul_buffer_get_data(buf, NULL, NULL);
size_t encsz, wsz = 0;
char *res = NULL;
if (!data)
goto nothing;
encsz = mbs_safe_encode_size(buf->sz) + 1;
if (encsz > buf->encoded_sz) {
char *tmp = realloc(buf->encoded, encsz);
if (!tmp)
goto nothing;
buf->encoded = tmp;
buf->encoded_sz = encsz;
}
res = mbs_safe_encode_to_buffer(data, &wsz, buf->encoded, safechars);
if (!res || !wsz || wsz == (size_t) -1)
goto nothing;
if (width)
*width = wsz;
if (sz)
*sz = strlen(res);
return res;
nothing:
if (width)
*width = 0;
if (sz)
*sz = 0;
return NULL;
}
#ifdef TEST_PROGRAM_BUFFER
enum {
PTR_AAA = 0,
PTR_BBB,
};
int main(void)
{
struct ul_buffer buf = UL_INIT_BUFFER;
char *str;
size_t sz = 0;
ul_buffer_set_chunksize(&buf, 16);
ul_buffer_append_string(&buf, "AAA");
ul_buffer_append_data(&buf, "=", 1);
ul_buffer_append_string(&buf, "aaa");
ul_buffer_save_pointer(&buf, PTR_AAA);
ul_buffer_append_data(&buf, ",", 1);
ul_buffer_append_string(&buf, "BBB");
ul_buffer_append_string(&buf, "=");
ul_buffer_append_string(&buf, "bbb");
ul_buffer_save_pointer(&buf, PTR_BBB);
str = ul_buffer_get_data(&buf, &sz, NULL);
printf("data [%zu] '%s'\n", sz, str);
printf(" pointer data len: AAA=%zu, BBB=%zu\n",
ul_buffer_get_pointer_length(&buf, PTR_AAA),
ul_buffer_get_pointer_length(&buf, PTR_BBB));
printf(" pointer data width: AAA=%zu, BBB=%zu\n",
ul_buffer_get_safe_pointer_width(&buf, PTR_AAA),
ul_buffer_get_safe_pointer_width(&buf, PTR_BBB));
ul_buffer_reset_data(&buf);
ul_buffer_append_string(&buf, "This is really long string to test the buffer function.");
ul_buffer_save_pointer(&buf, PTR_AAA);
ul_buffer_append_string(&buf, " YES!");
str = ul_buffer_get_data(&buf, &sz, NULL);
printf("data [%zu] '%s'\n", sz, str);
printf(" pointer data len: AAA=%zu\n", ul_buffer_get_pointer_length(&buf, PTR_AAA));
ul_buffer_free_data(&buf);
str = strdup("foo");
ul_buffer_refer_string(&buf, str);
ul_buffer_append_data(&buf, ",", 1);
ul_buffer_append_string(&buf, "bar");
str = ul_buffer_get_data(&buf, &sz, NULL);
printf("data [%zu] '%s'\n", sz, str);
ul_buffer_free_data(&buf);
}
#endif /* TEST_PROGRAM_BUFFER */
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