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#include "stringbuf.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
int StringBufInit(StringBuf *buf, size_t size)
{
assert(buf != NULL);
memset(buf, 0, sizeof(*buf));
return StringBufGrow(buf, size);
}
int StringBufInitFromCString(StringBuf *buf, const char *s, int len)
{
if (len < 0)
len = strlen(s);
return StringBufInitFromData(buf, s, len);
}
int StringBufInitFromData(StringBuf *buf, const void *ptr, size_t size)
{
if (StringBufInit(buf, size) != 0)
return -1;
memcpy(buf->data, ptr, size);
buf->len = size;
return 0;
}
void StringBufDeinit(StringBuf *buf)
{
assert(buf != NULL);
if (buf->size > 0 && buf->data)
free(buf->data);
memset(buf, 0, sizeof(*buf));
}
size_t StringBufAvailable(StringBuf *buf)
{
assert(buf != NULL);
assert(buf->data != NULL);
assert(buf->len <= buf->size);
return buf->size - buf->len;
}
int StringBufGrow(StringBuf *buf, size_t size)
{
assert(buf != NULL);
size_t newSize = buf->size + size;
char *ptr = realloc(buf->data, newSize+1);
if (!ptr)
return -1;
buf->data = ptr;
buf->size = newSize;
buf->data[buf->size] = '\0';
return 0;
}
int StringBufAppendData(StringBuf *buf, const void *ptr, size_t size)
{
assert(buf != NULL);
assert(buf->data != NULL);
assert(ptr != NULL);
assert(size > 0);
if (StringBufAvailable(buf) < size)
{
if (StringBufGrow(buf, size) == -1)
return -1;
}
memcpy(buf->data + buf->len, ptr, size);
buf->len += size;
return 0;
}
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