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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"
void ul_buffer_reset_data(struct ul_buffer *buf)
{
if (buf->begin)
buf->begin[0] = '\0';
buf->end = buf->begin;
}
void ul_buffer_free_data(struct ul_buffer *buf)
{
assert(buf);
free(buf->begin);
buf->begin = NULL;
buf->end = NULL;
buf->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;
}
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;
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)
{
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)
{
return buf->begin;
}
#ifdef TEST_PROGRAM_BUFFER
int main(void)
{
struct ul_buffer buf = UL_INIT_BUFFER;
char *str;
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_append_data(&buf, ",", 1);
ul_buffer_append_string(&buf, "BBB");
ul_buffer_append_string(&buf, "=");
ul_buffer_append_string(&buf, "bbb");
str = ul_buffer_get_data(&buf);
printf("data '%s'\n", str);
ul_buffer_reset_data(&buf);
ul_buffer_append_string(&buf, "This is really long string to test the buffer function.");
ul_buffer_append_string(&buf, " YES!");
str = ul_buffer_get_data(&buf);
printf("data '%s'\n", str);
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);
printf("data '%s'\n", str);
ul_buffer_free_data(&buf);
}
#endif /* TEST_PROGRAM_BUFFER */
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