163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
/*
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* No copyright is claimed. This code is in the public domain; do with
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* it what you wish.
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*
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* Written by Karel Zak <kzak@redhat.com>
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*/
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#include "buffer.h"
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void ul_buffer_reset_data(struct ul_buffer *buf)
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{
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if (buf->begin)
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buf->begin[0] = '\0';
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buf->end = buf->begin;
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}
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void ul_buffer_free_data(struct ul_buffer *buf)
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{
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assert(buf);
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free(buf->begin);
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buf->begin = NULL;
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buf->end = NULL;
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buf->sz = 0;
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}
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void ul_buffer_set_chunksize(struct ul_buffer *buf, size_t sz)
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{
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buf->chunksize = sz;
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}
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int ul_buffer_is_empty(struct ul_buffer *buf)
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{
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return buf->begin == buf->end;
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}
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void ul_buffer_refer_string(struct ul_buffer *buf, char *str)
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{
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if (buf->sz)
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ul_buffer_free_data(buf);
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buf->begin = str;
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buf->sz = str ? strlen(str) : 0;
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buf->end = buf->begin ? buf->begin + buf->sz : buf->begin;
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}
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int ul_buffer_alloc_data(struct ul_buffer *buf, size_t sz)
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{
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char *tmp;
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size_t len = 0;
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assert(buf);
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if (sz <= buf->sz)
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return 0;
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if (buf->end && buf->begin)
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len = buf->end - buf->begin;
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if (buf->chunksize)
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sz = ((sz + buf->chunksize) / buf->chunksize) * buf->chunksize + 1;
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tmp = realloc(buf->begin, sz);
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if (!tmp)
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return -ENOMEM;
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buf->begin = tmp;
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buf->end = buf->begin + len;
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buf->sz = sz;
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return 0;
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}
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int ul_buffer_append_data(struct ul_buffer *buf, const char *data, size_t sz)
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{
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size_t maxsz = 0;
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if (!buf)
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return -EINVAL;
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if (!data || !*data)
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return 0;
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if (buf->begin && buf->end)
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maxsz = buf->sz - (buf->end - buf->begin);
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if (maxsz <= sz + 1) {
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int rc = ul_buffer_alloc_data(buf, buf->sz + sz + 1);
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if (rc)
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return rc;
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}
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if (!buf->end)
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return -EINVAL; /* make static analyzers happy */
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memcpy(buf->end, data, sz);
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buf->end += sz;
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*buf->end = '\0'; /* make sure it's terminated */
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return 0;
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}
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int ul_buffer_append_string(struct ul_buffer *buf, const char *str)
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{
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return ul_buffer_append_data(buf, str, strlen(str));
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}
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int ul_buffer_append_ntimes(struct ul_buffer *buf, size_t n, const char *str)
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{
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size_t i;
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size_t len = strlen(str);
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for (i = 0; len && i < n; i++) {
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int rc = ul_buffer_append_data(buf, str, len);
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if (rc)
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return rc;
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}
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return 0;
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}
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int ul_buffer_set_data(struct ul_buffer *buf, const char *data, size_t sz)
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{
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ul_buffer_reset_data(buf);
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return ul_buffer_append_data(buf, data, sz);
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}
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char *ul_buffer_get_data(struct ul_buffer *buf)
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{
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return buf->begin;
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}
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#ifdef TEST_PROGRAM_BUFFER
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int main(void)
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{
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struct ul_buffer buf = UL_INIT_BUFFER;
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char *str;
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ul_buffer_set_chunksize(&buf, 16);
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ul_buffer_append_string(&buf, "AAA");
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ul_buffer_append_data(&buf, "=", 1);
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ul_buffer_append_string(&buf, "aaa");
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ul_buffer_append_data(&buf, ",", 1);
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ul_buffer_append_string(&buf, "BBB");
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ul_buffer_append_string(&buf, "=");
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ul_buffer_append_string(&buf, "bbb");
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str = ul_buffer_get_data(&buf);
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printf("data '%s'\n", str);
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ul_buffer_reset_data(&buf);
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ul_buffer_append_string(&buf, "This is really long string to test the buffer function.");
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ul_buffer_append_string(&buf, " YES!");
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str = ul_buffer_get_data(&buf);
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printf("data '%s'\n", str);
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ul_buffer_free_data(&buf);
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str = strdup("foo");
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ul_buffer_refer_string(&buf, str);
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ul_buffer_append_data(&buf, ",", 1);
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ul_buffer_append_string(&buf, "bar");
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str = ul_buffer_get_data(&buf);
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printf("data '%s'\n", str);
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ul_buffer_free_data(&buf);
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}
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#endif /* TEST_PROGRAM_BUFFER */
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